Enhanced uranium capture by xanthan gum-polyacrylic acid bound porous g-C3N4 electrode via electrosorption, coordination and electrocatalytic reduction
作者：
Weng, Xiaofang;Wei, Guoxing;Shen, Chengjin;Mei, Zihang;Que, Yiting;...
期刊：
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING ,2024年12(1):111920 ISSN：2213-2929
通讯作者：
Liao, Y
作者机构：
[Weng, Xiaofang; Shen, Chengjin; Lei, Ruilin; Que, Yiting; Liao, Yun; Mei, Zihang; Wei, Guoxing] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Wang, Hongqing; Liao, Yun] Univ South China, Hunan key Lab Design & Applicat Actinide Complexes, Hengyang 421001, Hunan, Peoples R China.;[Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Liao, Y ] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
关键词：
Carboxylic acids;Cost effectiveness;Electric fields;Electrochemical electrodes;Ions;Polyvinyl alcohols;Potassium hydroxide;Active site;Co ions;Electrocatalytic reduction;Electrode material;Electrosorption;Poly(acrylic acid);Porous g-C3N4;Repulsion effects;Surface wettability;Xanthan gum-polyacrylic acid;Porous materials
摘要：
Electrosorption holds extraordinary promise for uranium (U(VI)) capture but is still limited by the finite accessible active sites of electrode materials, poor surface wettability and its intrinsic co-ion repulsion effect. Here we originally designed KOH-etched porous graphitic carbon nitride (g-C3N4) as active material, and multi-functional crosslinked xanthan gum-polyacrylic acid (XG-PAA) as binder to fabricate g-C3N4-X electrode for U(VI) capture. The abundant in-plane nanopores on 2D g-C3N4 lamellar, rich O- and N-containing active sites, and 3D tough interconnected conductive architecture, endowed g-C3N4-X electrode with fast electron/ion transport channels, alleviated co-ions exclusion, superior electrochemical properties, and hydrophilicity. These unique structure characteristics enabled U(VI) ions to form micro electric-field attraction with negatively charged COO- groups in advance to alleviate co-ion repulsion, then to electro-migrate towards and coordinate with active sites, and eventually to be electrocatalytic reduced into U(IV) deposits. Consequently, the g-C3N4-X electrode exhibited a 1.87 times faster adsorption kinetics, a much higher removal ratio of 98.1% within 70 min than traditional PVDF-bound electrode. Meanwhile, the cumulative adsorption capacity of g-C3N4-X electrode after six cycles was up to 1459.1 mg g−1. This efficient, scalable, and cost-effective g-C3N4-X electrode represents a significant step forward toward the practical applications of U(VI) electrosorption. © 2024
语种：
英文
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高分子材料与工程专业“互联网+人文素养”教学改革研究
作者：
廖云;王孟;曾科;单德才
期刊：
高教学刊 ,2024年10(02):135-138 ISSN：2096-000X
作者机构：
南华大学 化学化工学院,湖南 衡阳 421001;南华大学 核科学与技术学院,湖南 衡阳 421001;[曾科; 王孟; 廖云; 单德才] 南华大学
关键词：
人文素养;互联网;高分子材料与工程;教学体系;教学改革
摘要：
互联网技术与人文素养教育相结合，是目前高校课堂教学改革的趋势。该文以高分子材料与工程专业为例，分析课堂教学现状，从构架专业阶梯型人文素养教育方案、搭建“互联网+人文素养”网络教育平台、课堂教学改革三方面入手，研究出适合高分子材料与工程专业的线上线下人文素养教育教学体系。
语种：
中文
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Arsenazo III-spectrophotometry for the determination of thorium content
作者：
Mei, Zihang;Chen, Guoxing;Liao, Yun;Zhang, Wenli;Wang, Meng
期刊：
Journal of Nuclear Science and Technology ,2024年 ISSN：0022-3131
通讯作者：
Liao, Y;Wang, M
作者机构：
[Liao, Yun; Mei, Zihang] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Chen, Guoxing; Zhang, Wenli] Daya Bay Nucl Power Operat & Management Co Ltd, Shenzhen, Guangdong, Peoples R China.;[Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Liao, Y ; Wang, M ] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
Thorium;Arsenazo III;spectrophotometry;absorbance
摘要：
The complexation interaction between arsenazo III chromogenic agent and tetravalent thorium ion (Th4+) is the theoretical basis for the determination of thorium by spectrophotometry. In this paper, the effects of the acidity, temperature, interfering ions and Th4+ concentration on the absorbance and stability of arsenazo III-Th4+ solution by spectrophotometry were systematically studied. The results showed that the solutions to be tested had high absorbance values and stability only when the concentration of hydrochloric acid was greater than 6 mol<middle dot>L-1. The absorbance decreased only 0.02 when the temperature was changed from 15 degrees C to 40 degrees C. The absorbance of arsenazo III-Th4+ solution at 662 nm showed a good linear relationship with the concentration of Th4+ under the same experimental environment (R2 = 0.9986), and the apparent molar absorption coefficient was 9.95 x 104 L<middle dot>mol-1<middle dot>cm-1, showing that thorium can be accurately quantitatively measured according to the Lambert-Beer law under these conditions.
语种：
英文
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Investigation of the effect of the key pore size on the radon adsorption performance by combining grand canonical Monte Carlo and activated carbon modification experiments
作者：
Deng, Xiangyuan;Liao, Yun;Wang, Meng* ;Xiao, Detao
期刊：
Applied Surface Science ,2024年643:158730 ISSN：0169-4332
通讯作者：
Wang, Meng;Xiao, DT
作者机构：
[Xiao, Detao; Deng, Xiangyuan; Wang, Meng; Xiao, DT] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Xiao, Detao; Deng, Xiangyuan; Xiao, DT] Univ South China, Radon Key Lab Hunan Prov, Hengyang 421001, Hunan, Peoples R China.;[Deng, Xiangyuan] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.;[Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, M; Xiao, DT ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Radon Key Lab Hunan Prov, Hengyang 421001, Hunan, Peoples R China.
关键词：
Activated carbon;Grand canonical Monte Carlo;KOH;Porous materials;Radon adsorption
摘要：
Radon (Rn) is an important contributing factor to lung cancer. Activated carbon (AC) is currently the only Rn adsorbent for industrial applications. However, the effect of the key pore size of AC on Rn adsorption remains unclear, and enhancement of the Rn adsorption performance when using AC is still a challenge. In this work, grand canonical Monte Carlo (GCMC) simulations were performed to simulate the Rn adsorption ability of AC with different pore sizes. The adsorption selectivity of AC with pore sizes from 0.42 nm to 0.60 nm for Rn in the atmospheric environment was much greater than that for nitrogen and oxygen. The Rn adsorption performance was also investigated using KOH-modified activated carbon (KAC) with different pore sizes experimentally prepared using high-temperature roasting. The results showed that when the pore volume of KAC was significantly increased to approximately 0.55 nm, the Rn adsorption performance was obviously improved. Its adsorption coefficient reached 6.50 ± 0.11 m3 kg−1, which was 46.7 % higher than that of AC. After heating and regeneration in air, the Rn adsorption performance of KAC was basically unchanged. Combined with the comparative analysis using theoretical and experimental results, the relationship between the Rn adsorption performance of KAC and the pore volume at 0.55 nm is determined, and the accuracy of the GCMC calculation results was substantiated. This research provides a theoretical basis and an experimental method for improving the Rn adsorption performance of AC. © 2023 Elsevier B.V.
语种：
英文
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Efficient U(VI) capture co-driven by multiple synergistic mechanisms in an advanced asymmetrical photoelectrocatalytic system
作者：
Liao, Yun;Lei, Ruilin;Chen, Guoxing;Shen, Chengjin;Mei, Zihang;...
期刊：
Applied Surface Science ,2024年654:159482 ISSN：0169-4332
通讯作者：
Wang, M;Wang, HQ
作者机构：
[Shen, Chengjin; Lei, Ruilin; Que, Yiting; Zhao, Jihao; Mei, Zihang; Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Chen, Guoxing] Daya Bay Nucl Power Operat & Management Co Ltd, Shenzhen 518124, Guangdong, Peoples R China.;[Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Wang, HQ; Wang, Hongqing] Univ South China, Hunan key Lab Design & Applicat Actinide Complexes, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, HQ ; Wang, M ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Hunan key Lab Design & Applicat Actinide Complexes, Hengyang 421001, Hunan, Peoples R China.
关键词：
Photoelectrocatalysis;Electrosorption;Catalytic reduction;Graphene;U(VI)
摘要：
Electro/photo/photoelectro-catalytic technologies have shown huge potential for U(VI) capture. However, current researches mainly focus on designing various electrode materials, but rarely on the significance of structure match and cooperative working mechanism of anode and cathode for U(VI) removal. Here, a multi-mechanism co-driven (MMCD) photoelectrochemical method, involving electrosorption, micro electric-field attraction, coordination and photoelectrocatalytic reduction, was originally proposed. Through purposeful design of an advanced asymmetrical photoelectrocatalytic system, consisting of 1D/2D TiO2/graphene (GTR) photoanode and xanthan gum-polyacrylic acid bound graphene (RGX) cathode, the MMCD system exhibited enhanced photoelectrocatalytic activity, fast electron transfer ability, and abundant binding active groups, which drove U (VI) ions to fast electro-migrate towards the surface of RGX cathode, then form micro electric-field attraction and coordination with electronegative O-containing groups, and finally be catalytically reduced into electroneutral sediments with the aid of photoelectrons from GTR anode. Ultimately, the MMCD system displayed a high removal rate of 90.5 % at 1.0 V, 1.7 times and 4.5 times that of electrochemical and photocatalytic methods. Its kinetic rate was also 71 % and 296 % faster than that of the latter two methods. Meanwhile, this system also exhibited an improved reduction efficiency of U(VI) to U(IV), high selectivity as well as good reusability.
语种：
英文
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Uranium capture by a layered 2D/2D niobium phosphate/holey graphene architecture via an electro-adsorption and electrocatalytic reduction coupling process
作者：
Liao, Yun;Lei, Ruilin;Weng, Xiaofang;Yan, Chuan;Fu, Jiaxi;...
期刊：
Journal of Hazardous Materials ,2023年442:130054 ISSN：0304-3894
通讯作者：
Wang, Meng(wmeng020321@163.com)
作者机构：
[Weng, Xiaofang; Fu, Jiaxi; Lei, Ruilin; Zhang, Chen; Wei, Guoxing; Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Wang, Hongqing; Liao, Yun] Univ South China, Hunan key Lab Design & Applicat Actinide Complexes, Hengyang 421001, Hunan, Peoples R China.;[Yan, Chuan; Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, Hongqing; Liao, Yun] H;[Wang, Meng] S;Hunan key laboratory for the design and application of actinide complexes, University of South China, Hengyang, Hunan 421001, PR China. Electronic address:;School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, China. Electronic address:;Hunan key laboratory for the design and application of actinide complexes, University of South China, Hengyang, Hunan 421001, PR China. Electronic address:
关键词：
Electrocatalysis;Electrodes;Energy efficiency;Graphene;Niobium compounds;'current;Capacitive deionization;Coupling process;Eco-friendly;Electro-adsorption;Electrocatalytic reduction;Energy efficient;Grapheme;Surface active sites;U(VI);Adsorption;activated carbon;graphene;graphene oxide;nanosheet;niobium;phosphate;polyvinylidene fluoride;uranium;adsorption;electrical method;electrokinesis;niobium;reduction;uranium;adsorption kinetics;Article;catalysis;controlled study;cross coupling reaction;crystal structure;current density;cyclic voltammetry;desorption;electron transport;high resolution transmission electron microscopy;impedance spectroscopy;ion transport;physical chemistry
摘要：
As an energy-efficient and eco-friendly technique, capacitive deionization (CDI) has shown great potential for uranium (U(VI)) capture recently. However, extracting U(VI) with high kinetics, capacity and selectivity remains a major challenge due to the current surface active sites-based material and co-existing ions in aqueous solution. Here we rationally designed a layered 2D/2D niobium phosphate/holey graphene (HGNbP) electrode material, and originally demonstrated its efficient U(VI) capture ability via an electro-adsorption and electrocatalytic reduction coupling process. The less-accumulative loose layered architecture, open polycrystalline construction of niobium phosphate with active phosphate sites, and rich in-plane nano-pores on conductive graphene nanosheets endowed HGNbP with fast charge/ion transport, high electroconductivity and superior pseudocapacitance, which enabled U(VI) ions first to be electro-adsorbed, then physico-chemical adsorbed, and finally electrocatalysis reduced/deposited onto electrode surface without the limitation of active sites under a low potential of 1.2 V. Based on these virtues, the HGNbP exhibited a fast adsorption kinetics, with a high removal rate of 99.9% within 30 min in 50 mg L−1 U(VI) solution, and a high adsorption capacity up to 1340 mg g−1 in 1000 mg L−1 U(VI) solution. Furthermore, the good recyclability and selectivity towards U(VI) were also realized. © 2022 Elsevier B.V.
语种：
英文
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Introducing hydroxyl-containing POSS to liquefaction of biomass: An alternative route to bio-based polyurethane nanocomposites for coated fertilizers
作者：
Li, Lixia;Dong, Shuqi;Li, Hongyan;Wang, Meng* ;Liang, Lina;...
期刊：
European Polymer Journal ,2023年192:112082 ISSN：0014-3057
通讯作者：
Wang, Meng;Pang, MH
作者机构：
[Liang, Lina; Li, Hongyan; Pang, Minhui; Pang, MH; Wang, Meng; Li, Lixia; Dong, Shuqi] Beijing Acad Agr & Forestry Sci, Inst Plant Nutr Resources & Environm, Beijing 100097, Peoples R China.;[Liang, Lina; Li, Hongyan; Pang, Minhui; Li, Lixia; Dong, Shuqi] Res Ctr Beijing Municipal Slow & Controlled Releas, Beijing 100097, Peoples R China.;[Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Pang, MH ; Wang, M] B;Beijing Acad Agr & Forestry Sci, Inst Plant Nutr Resources & Environm, Beijing 100097, Peoples R China.
关键词：
Bio-based;Biomass;Liquefaction;Nanocomposite;POSS
摘要：
A new route, introducing POSS-OH to liquefaction of biomass, is developed for bio-based polyurethane nanocomposites and applied in the controlled release of chemicals. The effect of POSS-OH on the chemical structures and properties of biopolyols and their coatings was characterized by GC–MS, FTIR and others. The results indicated that after adding POSS-OH to liquefaction of starch, the hydroxyl content of the biopolyol synthesized was higher than that of the biopolyol from sole starch, and the resultant nanocomposite owned good thermal stability, water resistance and, importantly, non-toxicity to plants. Meanwhile, after coating the urea granules, the controlled release ability of the nanocomposite coating with 3% POSS-OH was the best, and in comparison with the coating without POSS-OH the nitrogen release duration was prolonged by a month. Overall, POSS-OH was used not only as both co-liquefier of biomass instead of the commonly used glycerol to affect the liquefaction process, but also as filler for bio-based polyurethane nanocomposite to improve the interaction. Thus, the substitution of petroleum-based polyols can be expected in synthesizing the green and bio-based coatings for controlled release of chemicals. © 2023 Elsevier Ltd
语种：
英文
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Uranium extraction by a graphene-based asymmetric electrode configuration through combined complexation, electro-adsorption, and photocatalytic reduction
作者：
Yan, Chuan;Liao, Yun;Shen, ChengJin;Weng, Xiaofang;Lei, Ruilin;...
期刊：
Chemical Engineering Journal ,2023年461:142012 ISSN：1385-8947
通讯作者：
Liao, Yun(liaoyun0107@163.com)
作者机构：
[Liao, Chenlin; Yan, Chuan; Zhou, Yuxiang; Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Shen, ChengJin; Weng, Xiaofang; Lei, Ruilin; Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Liao, Yun] Univ South China, Hunan Key Lab Design & Applicat Actinide Complexes, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Yun Liao; Meng Wang] S;School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China<&wdkj&>Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang, Hunan 421001, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, China
关键词：
U(VI);Electro-adsorption;Photocatalytic reduction;Complexation;Graphene
摘要：
Recently, capacitive deionization has become a promising approach for uranium extraction owing to its energy-efficiency and environmental benign. However, the adsorbed charged uranium (VI) (U(VI)) would repulse the incoming U(VI) ions, and might re-enter into solution, vastly impeding the improvement of electro-adsorption performance. Reducing the adsorbed U(VI) ions into U(IV) precipitation is an ideal way to address above issues. Here, a coupling approach of photocatalytic reduction and electro-adsorption (PEA) was proposed. An asymmetric electrode configuration, composed of phosphate functionalized graphene (GP) cathode and graphene/TiO2 nanocomposite (GT) anode was rationally designed, and originally proved its enhanced U(VI) extraction via the PEA method. The asymmetric electrode device enables the fast transport of photo-electron and the rapidly directed migration of U(VI) ion to the GP cathode. More importantly, it combines three synthetic mechanisms of complexation, electro-adsorption, and photocatalytic reduction to extract U(VI) ions. As a consequence, the as-designed PEA method shows a higher removal rate of 91.3% in comparison with conventional photocatalytic reduction (PA) and electro-adsorption (EA) methods. Meanwhile, its kinetics rate is 225% and 50% faster than PA and EA methods. Furthermore, an enhanced reduction efficiency of U(VI) to U(IV), good selectivity as well as reusability for PEA method were also obtained. The results provide a potential approach to combine multiple mechanisms for efficient U(VI) extraction from aqueous solution by purposeful design of asymmetric electrodes. © 2023 Elsevier B.V.
语种：
英文
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蓖麻油基聚氨酯固化动力学研究
作者：
廖成林;李子翱;周裕翔;翁晓芳;廖云;...
期刊：
热固性树脂 ,2023年38(03):34-37 ISSN：1002-7432
作者机构：
[李子翱; 周裕翔; 王孟; 廖成林] 南华大学核科学与技术学院;[廖云; 翁晓芳] 南华大学化学化工学院
摘要：
通过示差扫描量热(DSC)法研究了蓖麻油基聚氨酯的非等温固化反应热效应特征及反应动力学，分析测得恒温固化反应起始温度Ti、峰值温度Tp和终止温度Tf分别为-12.15,67.95,117.25℃。采用Kissinger经验模型求得固化反应的表观活化能Ea和指前因子A分别为49.734 kJ/mol和1.18×105,Crane经验模型求得固化反应的级数n为0.89，建立的固化反应动力学方程为蓖麻油基聚氨酯的控释肥包膜的实际固化工艺条件提供了理论依据。
语种：
中文
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High-efficiency radon adsorption by nickel nanoparticles supported on activated carbon
作者：
Deng, Xiangyuan;Yu, Bo;Wu, Haibiao;He, Zhengzhong;Wang, Meng* ;...
期刊：
NEW JOURNAL OF CHEMISTRY ,2022年46(19):9222-9228 ISSN：1144-0546
通讯作者：
Wang, Meng;Xiao, DT
作者机构：
[He, Zhengzhong; Xiao, Detao; Deng, Xiangyuan; Wang, Meng; Yu, Bo; Wu, Haibiao; Xiao, DT] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[He, Zhengzhong; Xiao, Detao; Deng, Xiangyuan; Yu, Bo; Wu, Haibiao; Xiao, DT] Univ South China, Radon Key Lab Hunan Prov, Hengyang 421001, Hunan, Peoples R China.;[Deng, Xiangyuan] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, M; Xiao, DT ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Radon Key Lab Hunan Prov, Hengyang 421001, Hunan, Peoples R China.
关键词：
Adsorption;Health risks;Metal nanoparticles;Microporosity;Nickel;Radon;Activated carbon composites;Adsorption coefficients;Adsorption performance;Composite combining;Higher efficiency;Human health;Metal sites;Micropores;Nickel nanoparticles;Radioactive gas;Activated carbon
摘要：
Radon (Rn) is a universally known indoor radioactive gas that poses a significant threat to human health. Activated carbon (AC) is the only commercial Rn adsorbent; its adsorption performance is extremely limited due to too few micropores. A series of nickel nanoparticles supported on AC (Ni/AC) composites, combining abundant micropores with open metal sites, is rationally designed for adsorbing Rn via a two-step process consisting of impregnation and high-temperature reduction. The Rn adsorption performance of the Ni/AC composites is obviously improved due to the introduction of nickel nanoparticles. The adsorption coefficient of Ni/AC calcined at 800 °C reaches 6.56 ± 0.14 m3 kg-1 at 25 °C and 1 bar, 48% higher than that of AC. The Ni/AC Rn adsorption coefficient is similar over five cycles. The fine and homogeneous dispersion of nickel nanoparticles, the appropriate chemical state of nickel and the high content of Ni0 synergistically promote Rn adsorption on Ni/AC. Experiments verify that Ni/AC composites are a promising candidate for the adsorption of Rn in the atmospheric environment. © 2022 The Royal Society of Chemistry
语种：
英文
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Synthesis of molybdenum disulfide/graphene oxide composites for effective removal of U (VI) from aqueous solutions
作者：
Liu, Renjuan;Wang, Hai;Yue, Chengtao;Zhang, Xu;Wang, Meng;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2022年331(9):3713-3722 ISSN：0236-5731
通讯作者：
Hai Wang
作者机构：
[Yue, Chengtao; Zhang, Xu; Wang, Hai; Liu, Renjuan; Wang, Meng; Liu, Longcheng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Hai Wang] S;School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词：
chemical compound;graphene oxide;metal ion;molybdenum disulfide;unclassified drug;uranium;adsorption kinetics;aqueous solution;Article;concentration (parameter);Fourier transform infrared spectroscopy;pH;scanning electron microscopy;surface property;synthesis;X ray diffraction;X ray photoemission spectroscopy
摘要：
In this study, a novel adsorbents, molybdenum disulfide-graphene oxide (MoS2–GO) composites, is prepared by one-step hydrothermal method and used for U (VI) adsorption. SEM, XRD, FT-IR, BET and XPS results show that the MoS2 layers grow on the surface of graphene oxide layers, forming MoS2–GO composite structure. The specific surfaces area of MoS2–GO composite (5.5 m2/g) is higher than that of MoS2 (2.3 m2/g). Batch adsorption experiments indicate that the adsorption process of uranium (VI) on MoS2–GO conforms to the quasi-second-order kinetic model and the adsorption isotherm accords with Langmuir model. The maximum adsorption capacity calculated by Langmuir model is 136mg·g−1 at pH 5.0 and 298K. Meanwhile, MoS2–rGO displays excellent selectivity for U (VI) in multicomponent metal ion solution. The increasement in specific surface area and the introduction of GO that rich in O-containing groups, provide more accessible binding sites for U (VI), which greatly enhance its uranium uptake capability. This work shows the potential of MoS2–GO as novel and promising materials in the efficient elimination of U (VI) from contaminated water and industrial effluents. © 2022, Akadémiai Kiadó, Budapest, Hungary.
语种：
英文
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基于α谱的尿中~(237)Np的测量方法
作者：
文雯;王孟;娄海林;文富平
期刊：
核化学与放射化学 ,2022年44(5):558-564 ISSN：0253-9950
作者机构：
[文雯] 南华大学 核科学技术学院,湖南 衡阳 421001;[文雯] 中国原子能科学研究院 核安全研究所,北京 102413;[王孟] 南华大学;[文富平; 娄海林] 中国原子能科学研究院
关键词：
尿样;α谱仪
摘要：
~(237)Np属于高毒组核素,吸入人体后,会产生内照射危害。基于尿样中~(237)Np的分析测量既是常规监测的重要手段,也是研究职业工作人员人体~(237)Np剂量水平的关键方法,通过共沉淀预浓集,讨论了尿样中~(237)Np的前处理过程,系统地研究了TEVA萃取色谱树脂分离纯化和电沉积过程对~(237)Np化学回收率的影响。结果表明:该法对~(237)Np的化学回收率可达88.5%,方法检测限为2.55×10~(-5) Bq/L。该分析方法满足常规监测要求,适用于大体积尿样中~(237)Np的监测评价。
语种：
中文
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Preparation and properties of starch-based polyurethane/montmorillonite composite coatings for controlled-release fertilizer
作者：
Liao, Yun;Liu, Li;Wang, Meng* ;Li, Li-Xia* ;Cao, Bing;...
期刊：
Polymer Composites ,2021年42(5):2293-2304 ISSN：0272-8397
通讯作者：
Wang, Meng;Li, Li-Xia
作者机构：
[Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang, Peoples R China.;[Liu, Li; Wang, Hai; Wang, Meng; Liao, Yun; Huang, Wei-Qiang] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Cao, Bing; Li, Li-Xia] Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resource, Beijing 100097, Peoples R China.
通讯机构：
[Wang, Meng] U;[Li, Li-Xia] B;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resource, Beijing 100097, Peoples R China.
关键词：
controlled‐release fertilizer;montmorillonite;polyurethane;starch
摘要：
<jats:title>Abstract</jats:title><jats:p>In order to enhance the controlled‐release property of starch‐based polyurethane (SPU) coating, polyurethane/montmorillonite (SPU/MMT) composite coatings for controlled‐release urea were prepared by in‐situ polymerization with a rotating drum. The effect of MMT on morphology, structure, physico‐chemical properties, especially controlled‐release property of the as‐prepared composite coatings were studied in detail. The results showed that MMT particles dispersed well in SPU matrix, and the obtained SPU/MMT composite coatings possessed more tough and compact morphology with less‐visible holes compared with SPU coating. With the content of MMT rising to 3%, the time needed for 75% nitrogen release increased to 49 days, much longer than 14 days of SPU coating. Further, the nitrogen release mechanism underlying the structure and properties of SPU/MMT composite coatings were discussed and elucidated. According to the analysis, the superior controlled‐release property of SPU/MMT coatings originated from the impermeablity to water molecules of layered MMT acting as mechanical barriers to increase the diffusion path and resistance, the enhanced crosslinking density and hydrophobicity of composite system due to the introduction of MMT, as well as the improved mechanical properties hindering the formation of cracks and enlargement of the holes on the surface of composite coatings.</jats:p>
语种：
英文
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Activated carbon/attapulgite composites for radon adsorption
作者：
Liu, Li;Deng, Xiangyuan;Liao, Yun;Xiao, Detao;Wang, Meng*
期刊：
Materials Letters ,2021年285:129177 ISSN：0167-577X
通讯作者：
Wang, Meng
作者机构：
[Liu, Li; Xiao, Detao; Deng, Xiangyuan; Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, Meng] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
Adsorption;Microporosity;Radon;Adsorption capacities;Adsorption coefficients;Adsorption-desorption cycles;Hierarchical porous;Macropores;Meso-pores;Nano-attapulgite;Regeneration performance;Activated carbon
摘要：
In order to improve the radon adsorption capacity of activated carbon (AC), one-dimensional nano attapulgite (AT) was filled into the macropores and mesopores of activated carbon, and sintered to prepare activated carbon/attapulgite (AC/AT) composites with more abundant micropores. The effect of AT on the structure and radon adsorption capacity of activated carbon was studied in detail. The results show that AT can easily diffuse into the macropores and mesopores of activated carbon to form a new hierarchical porous network, which significantly increases the specific surface area and proportion of micropores of activated carbon. The as-prepared AC/AT composites exhibit excellent radon adsorption and regeneration performance. With the filling content of AT ranging from 0 to 3%, the radon adsorption coefficient increases from 4.28 L/g to 5.35 L/g, and maintains 92.7% of its initial value after 5 adsorption-desorption cycles. © 2020 Elsevier B.V.
语种：
英文
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Functional two-dimensional black phosphorus nanostructures towards next-generation devices
作者：
Wang, Mengke;Zhu, Jun;Zi, You;Wu, Zheng-Guang;Hu, Haiguo;...
期刊：
Journal of Materials Chemistry A ,2021年9(21):12433-12473 ISSN：2050-7488
通讯作者：
You Zi<&wdkj&>Zheng-Guang Wu<&wdkj&>Lanping Hu<&wdkj&>Weichun Huang
作者机构：
[Huang, Weichun; Wang, Mengke; Zi, You; Hu, Lanping; Zhu, Jun; Wu, Zheng-Guang] Nantong Univ, Sch Chem & Chem Engn, Nantong 226019, Jiangsu, Peoples R China.;[Hu, Lanping; Wu, Zheng-Guang] Nantong Univ, Nantong Key Lab Intelligent & New Energy Mat, Nantong 226019, Jiangsu, Peoples R China.;[Xie, Zhongjian; Hu, Haiguo] Shenzhen Univ, Inst Microscale Optoelect, Minist Educ,Collaborat Innovat Ctr Optoelectron S, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Shenzhen 518060, Guangdong, Peoples R China.;[Zhang, Ye] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[You Zi; Zheng-Guang Wu; Lanping Hu; Weichun Huang] S;School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, Jiangsu, P. R. China<&wdkj&>Nantong Key Lab of Intelligent and New Energy Materials, Nantong University, Nantong 226019, Jiangsu, P. R. China<&wdkj&>School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, Jiangsu, P. R. China
摘要：
In recent years, two-dimensional (2D) black phosphorus (BP) has been widely applied in many fields, such as (opto)electronics, transistors, catalysis and biomedical applications due to its large surface area, tunable direct bandgap, superior charge carrier mobility, and unique in-plane anisotropic structure. To exploit its full potential and push the limits, studies on functional 2D BP nanostructures fabricated by a variety of methods, such as surface functionalization and hybridization, are rapidly expanding for next-generation devices with unprecedented properties. In this review, firstly, the synthetic techniques and fundamental properties of functional 2D BP nanostructures, including surface-modified 2D BP nanostructures and mixed-dimensional 2D BP-based heterostructures, are systematically summarized. Secondly, the recent progress of functional 2D BP nanostructures in the fields of energy storage and conversion, (opto) electronics, catalysis, sensors, nonlinear photonics, and biomedical applications is highlighted. Last but not least, the challenges and future opportunities in these emerging areas are discussed. We hope that this review can provide fundamental guidance on new designs of high-performance functional 2D BP nanostructures to meet the growing demand of next-generation devices. This journal is © 2021 The Royal Society of Chemistry.
语种：
英文
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Asymmetric polysaccharide-bound graphene electrode configuration with enhanced electrosorption performance for uranium (VI) ions
作者：
Liao, Yun;Yan, Chuan;Zeng, Ke;Liao, Chenglin;Wang, Meng
期刊：
Chemical Engineering Journal ,2021年424:130351 ISSN：1385-8947
通讯作者：
Wang, Meng(wmeng020321@163.com)
作者机构：
[Zeng, Ke; Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Zeng, Ke; Liao, Yun] Univ South China, Hunan Key Lab Design & Applicat Actinide Complexe, Hengyang 421001, Hunan, Peoples R China.;[Yan, Chuan; Wang, Meng; Liao, Chenglin] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Meng Wang] S;School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, PR China
关键词：
Co-ions expusion;Electrosorption;Graphene;Polysaccharide binders;Uranium (VI)
摘要：
As an energy-saving and facile technology, the potential of capacitive deionization (CDI) starts to surface in enrichment and recovery of uranium (U(VI)) from aqueous solutions. However, co-ion expulsion effect and poor surface wettability of electrode materials limit the eletrosorption performance. Here, polysaccharides xanthan gum (XG)- and chitosan (CS) -bound porous reduced graphene (RGH) electrodes were rationally designed, and then assembled into asymmetrical electrode configuration for U(VI) eletrosorption. Owing to the introduction of polysaccharide binders, the oppositely charged groups on the surface of cathode and anode weaken the co-ions exclusion effect as well as endow their superior surface hydrophilicity and electroconductivity, which facilitates the electrosorption for U(VI). Meanwhile, the negatively charged carboxylate groups could act as extra micro electric fields to attract U(VI) cations, and form stronge complexation between them. As a consequence, asymmetrical polysaccharide-bound RGH configuration gave rise to a larger removal ratio of 97.9% within 4 h at 1.2 V, as well as 2.5 times faster kinetics than symmetrical PVDF-bound RGH electrode configuration. Moreover, the accumulated adsorption capacity in six adsorption–desorption cycles of the former is up to 1413.0 mg g−1, 75% higher than the latter, which is of practical significance and economic benefit for electrosorption application. © 2021 Elsevier B.V.
语种：
英文
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Structure and properties of bio-based polyurethane coatings for controlled-release fertilizer
作者：
Liao, Yun;Cao, Bing;Liu, Li;Wu, Xiandong;Guo, Sheng;...
期刊：
Journal of Applied Polymer Science ,2021年138(15):50179- ISSN：0021-8995
通讯作者：
Wang, Meng
作者机构：
[Guo, Sheng; Mi, Changhui; Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang, Peoples R China.;[Cao, Bing] Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resource, Beijing, Peoples R China.;[Li, Kaiwen; Liu, Li; Wang, Meng; Wu, Xiandong] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, Meng] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
applications;biopolymers and renewable polymers;surfaces and interfaces;structure-property relationships;polyurethane
摘要：
Two kinds of bio-based polyurethane coatings for controlled-release urea were prepared by in-situ polymerization used castor oil and liquefied starch as raw materials, respectively. Scanning electron microscopy (SEM) showed that the section morphology of castor oil based polyurethane (Castor-PU) coating was uniform and dense, and that of liquefied starch based polyurethane (Starch-PU) coating had certain proportion of microporous. Infrared spectroscopy (IR) showed that the two coatings had typical urethane characteristic structure, but the difference was that the Starch-PU had obvious unreacted isocyanate structure. Differential scanning calorimetry (DSC) showed that the glass transition temperature of the two coatings was around 58°C, but the Castor-PU had a crystallization domain with obvious crystallization melting peak at 130°C. Thermogravimetric analysis (TG) showed that the thermal stability of Castor-PU was significantly higher than that of Starch-PU. The controlled-release property test showed that when the coating ratio was 2.8%, the nutrient release longevity of urea coated with Castor-PU was 49 days and that of urea coated with Starch-PU was 14 days. The reasons for the poor controlled-release performance of Starch-PU were analyzed, which probably caused by concentrated sulfuric acid and hydrophilic dispersant added in the liquefied starch. © 2020 Wiley Periodicals LLC.
语种：
英文
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Preliminary study on physical characteristics of single-pass super-critical water-cooled reactor core
作者：
Wang, Mingyue;Huang, Liping;Zhang, Qian;Seidl, Marcus;Liu, Zijing;...
期刊：
International Journal of Energy Research ,2021年45(8):11807-11821 ISSN：0363-907X
通讯作者：
Wang, Xiang
作者机构：
[Huang, Liping; Wang, Mingyue; Wang, Xiang; Zhang, Qian] Harbin Engn Univ, Coll Nucl Sci & Technol, Harbin 150001, Heilongjiang, Peoples R China.;[Seidl, Marcus] Tech Univ Munich, Dept Nucl Engn, Garching, Germany.;[Liu, Zijing] Univ South China, Dept Nucl Sci & Technol, Hengyang, Peoples R China.
通讯机构：
[Wang, Xiang] H;Harbin Engn Univ, Coll Nucl Sci & Technol, Harbin 150001, Heilongjiang, Peoples R China.
关键词：
Assembly;Cladding (coating);Coolants;Cooling water;Neutron spectrometers;Nuclear fuels;Oxide minerals;Reactor cores;Sensitivity analysis;Thoria;Uranium dioxide;Water cooling systems;Cladding material;Fast neutron spectrums;Fuel compositions;Fundamental research;Physical characteristics;Power distributions;Pressurized water;System characteristics;Pressurized water reactors
摘要：
The super-critical water-cooled reactor (SCWR) is one of six types of Gen-IV reactors. Based on the current mature pressurized water reactor technology, it has several advantages, including high conversion ratio, high breeding of nuclear fuel, high thermal efficiency, and a simplified system. However, due to the combination of water coolant and fast neutron spectrum, there is a need to address safety problems caused by the positive void coefficient. The purpose of this paper is to give a study on physical characteristics for the reactor core. Herein, the core modeling of an SCWR with a single-pass flow is that seed assemblies and blanket assemblies are arranged in a tornado manner, in which MCNP and SERPENT are used for critical calculation. The assembly design is discussed from the aspects of the thickness of the solid moderator layer and cladding material. Based on the optimized assembly design, UO2, PuO2-ThO2, and PuO2-UO2 are selected for the sensitivity analysis of fuel composition. In addition, sensitivity analysis for axial coolant density distribution, water-to-fuel volume ratio, reflector thickness and fuel arrangement are carried out. Several fundamental system characteristics are discussed in this paper, including keff, void coefficient, Doppler coefficient, neutron spectrum, power distribution, one-cycle burnup and conversion ratio. The results help in understanding the design of the SCWR better and provide fundamental research data for further study. © 2020 John Wiley & Sons Ltd
语种：
英文
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Bio-based polyurethane nanocomposite thin coatings from two comparable POSS with eight same vertex groups for controlled release urea
作者：
Li, Lixia* ;Wang, Meng;Wu, Xiandong;Yi, Wenping;Xiao, Qiang*
期刊：
Scientific Reports ,2021年11(1):9917 ISSN：2045-2322
通讯作者：
Li, Lixia;Xiao, Qiang
作者机构：
[Li, Lixia; Yi, Wenping; Xiao, Qiang; Wu, Xiandong] Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resource, Beijing 100097, Peoples R China.;[Li, Lixia; Yi, Wenping; Xiao, Qiang] Res Ctr Beijing Municipal Slow & Controlled Relea, Beijing 100097, Peoples R China.;[Wang, Meng; Wu, Xiandong] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Xiao, Qiang; Li, Lixia] I;Institute of Plant Nutrition and Resource, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China.;Research Center of Beijing Municipal Slow and Controlled Release Fertilizers Engineering Technology, Beijing, 100097, China.
摘要：
Nanocomposite modification has attracted much attention in improving properties of bio-based polymer coating material for coated fertilizer. Herein two comparable polyhedral oligomeric silsesquioxanes (POSS), with eight poly(ethylene glycol) (PEG) and octaphenyl groups attached to the cage, respectively, were successfully incorporated into thin castor oil-based polyurethane coatings via in-situ polymerization on the urea surface. The nanostructure coatings are environmentally friendly, easy to prepare, and property-tunable. The results show that the vertex group of POSS had a pronounced influence on dispersion level and interaction between polyurethane and POSS that well-tuned the release pattern and period of coated urea, even at the coating rate as low as of 2 wt%. The liquid POSS with long and flexible PEG groups had better compatibility and dispersibility in polyurethane matrix than the solid POSS with rigid octaphenyl groups, as evidenced by SEM/EDS. The unique properties were resulted from the different extents of physical crosslinkings. This modification of bio-based polyurethane coating with POSS provided an alternative method of regulating and controlling the properties of coated fertilizer.
语种：
英文
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P(AA-AM)/SiO_2复合保水材料的制备及其在保水缓释肥中应用
作者：
曹兵;王孟;杨凯劲;倪小会;王学霞;...
期刊：
农业工程学报 ,2020年36(14):167-173 ISSN：1002-6819
通讯作者：
Chen, Yanhua(yhchen55@126.com)
作者机构：
[曹兵; 倪小会; 王学霞; 邹国元; 陈延华] Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forestry Science, Beijing;100097, China;Beijing Engineering Technology Research Center for Slow/Controlled-Release Fertilizer, Beijing;[王孟; 杨凯劲] School of Nuclear Science and Technology, Nanhua University, Hengyang;421001, China
通讯机构：
Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forestry Science, Beijing, China
关键词：
肥料;吸水率;保水材料;保水缓释肥;释放期
摘要：
开发具有保水缓释双重功能的新型肥料,对于提高水肥利用效率和保障农业可持续发展具有重要意义。该研究探索了纳米二氧化硅(SiO_2)对提升保水材料吸水率及改善保水缓释肥性能的效果,采用丙烯酸(AA)和丙烯酰胺(AM)为原料,首先通过水溶液原位聚合法制备了P(AA-AM)/SiO_2复合保水材料,然后采用双层包膜工艺制备了保水缓释肥,在合成保水材料时,丙烯酸和丙烯酰胺的质量比为3.5∶1,引发剂(过硫酸钾和亚硫酸钠)、交联剂(N,N-亚甲基双丙烯酰胺)、增塑剂(丙三醇)和纳米SiO_2分别为单体质量的1%、0.04%、15%和2%。保水缓释肥采用转鼓包膜工艺制备,内包膜层为聚氨酯,占肥料核芯的3%,外包膜层为P(AA-AM)/SiO_2复合保水材料,占肥料核芯的24%。保水材料的形貌结构和热稳定性用傅里叶红外光谱(Fourier transform infrared spectroscopy,FTIR)、扫描电镜(Scanning electron microscopy,SEM)和热重(Thermogravimetry,TG)表征,保水材料的吸水率用过滤法测定;采用土壤培养研究保水缓释肥的保水和持水性能,保水缓释肥的缓释性能用水浸泡法研究。结果发现:纳米SiO_2能较好地分散于基体P(AA-AM)保水材料中,与P(AA-AM)保水材料相比,添加纳米SiO_2的复合保水材料在去离子水和0.9% NaCl水溶液中的吸水率分别提高152%和87%,而且热稳定性显著提高;SEM和FTIR结果表明,纳米SiO_2能较好地分散于P(AA-AM)保水材料中,SiO_2表面含有的硅羟基增加了保水材料的交联密度。相比没有保水层的缓释肥,复合保水缓释肥的土壤持水率和保水率(培养25 d后)分别提高了25.5%和47.2%,肥料释放期由60 d增加到72 d。综上所述,纳米SiO_2显著提高了保水材料的吸水率,以此制备的复合保水缓释肥具有优异的保水和缓释能力,该研究为研发高效肥料、提高水肥利用效率提供了新思路。
语种：
中文
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