摘要：
With the fast development of nanoscience and nanotechnology, the nanomaterials have attracted multidisciplinary interests. The high specific surface area and large numbers of oxygen-containing functional groups of graphene oxides (GOs) make them suitable in the preconcentration and solidification of radionuclides from wastewater. In this paper, mainly based on the recent work carried out in our laboratory, the efficient elimination of radionuclides using GOs and GO-based nanomaterials as adsorbents are summarized and the interaction mechanisms are discussed from the results of batch techniques, surface complexation modeling, spectroscopic analysis and theoretical calculations. This review is helpful for the understanding of the interactions of radionuclides with GOs and GO-based nanomaterials, which is also crucial for the application of GOs and GO-based nanomaterials in environmental radionuclide pollution management and also helpful in nuclear waste management.
关键词：
cathode materials;nanoarchitectured;coprecipitation;electrochemical properties;lithium ion battery
摘要：
To explore advanced cathode materials for lithium ion batteries (LIBs), a nanoarchitectured LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 (LNCM) material is developed using a modified carbonate coprecipitation method in combination with a vacuum distillation-crystallisation process. Compared with the LNCM materials produced by a traditional carbonate coprecipitation method, the prepared LNCM material synthesized through this modified method reveals a better hexagonal layered structure, smaller particle sizes (ca. 110.5 nm), and higher specific surface areas. Because of its unique structural characteristics, the as-prepared LNCM material demonstrates excellent electrochemical properties including high rate capability and good cycleability when it is utilized as a cathode in the lithium ion battery (LIB).
摘要：
The highly enantioselective cross-dehydrogenative coupling of aldehydes with benzylic compounds has been developed as an efficient and rapid protocol for synthesis of enantioriched a-alkylated aldehydes.
作者机构：
[Zhu, Lin; Guo, Wenlu; Nie, Changming] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;[Zhu, Lin; Zhu, Liuzheng; Yuan, Liyong; Li, Zijie; Shi, Weiqun; Guo, Wenlu; Wang, Lin] Chinese Acad Sci, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.;[Zhu, Lin; Zhu, Liuzheng; Yuan, Liyong; Li, Zijie; Shi, Weiqun; Guo, Wenlu; Wang, Lin] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Zhu, Zhentai] State Key Lab NBC Protect Civilian, Beijing 102205, Peoples R China.
通讯机构：
[Nie, Changming] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;[Yuan, Liyong] Chinese Acad Sci, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.;[Yuan, Liyong] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
摘要：
Functionalized magnetic Fe_3O_4@SiO_2 composite nanoparticles were prepared by simply embedding iron oxide nanoparticles into MCM-41 through one-step synthesis process, followed by aminopropyls grafting on the mesopore channels, aiming to efficiently and conveniently uptake U(VI) from aqueous solution. The resultant material possesses highly ordered mesoporous structure with large surface area, uniform pore size, excellent thermal stability, quick magnetic response, and desirable acids resistance, confirmed by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), N_2 adsorption/ desorption experiments, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). Detailed U(VI) sorption test indicated that this material is indeed an effective U(VI) sorbent with fast sorption kinetics of less than 2 h, large sorption capacity of 160 mg/g at pH 5.0±0.1, and desirable selectivity towards U(VI) ions over a range of competing metal ions. The absorbed U(VI) can be easily desorbed by 0.01 mol/L or more concentrated HNO3 solution, and the reclaimed sorbent can be reused with no obvious decrease of sorption capacity even after 4 sorption-desorption cycles. The present results suggest the vast opportunities of this kind of magnetic composite on the solid-phase extraction of U(VI).
摘要：
Uranium was not only the main source of nuclear energy but also one of the long-lived radionuclide. Herein,a novel arginine modified hydroxyapatite carbon microsphere composites (defined as C@HAp/ Arg) obtained promptly via a one-step mild hydrothermal method,was applied to remove U(VI) from aqueous solutions. Based on the characterization of transmission electron microscopy (TEM),scanning electron microscopy (SEM),Fourier transformed infrared spectroscopy (FT-IR),X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS),the synthesized C@HAp/Arg presented globular morphology and abundant functional groups (e.g.,ACOO~-),which were beneficial to its combination with U(VI). The interaction mechanism and removal capability of U(VI) on C@HAp/Arg were studied by batch adsorption technique and spectroscopy analysis. The results implied that U(VI) can form strong surface complexes on C@HAp/Arg. The kinetics adsorption of U(VI) followed pseudo-second-order kinetic model with high removal efficiency (~95% within 5 h at pH 5.0). The adsorption isotherms were well fitted by Langmuir model,implying that U(VI) uptake on C@HAp/Arg was monolayer coverage. It was found that the maximum adsorption capacities of CSs,C@HAp and C@HAp/Arg toward U(VI) were calculated to be 23.16,72.09 and 569.66 mg/g,respectively,at 298.15 K and pH 5.0,and thermodynamic parameters revealed that the adsorption processes of U(VI) were spontaneous and endothermic. In addition,effect of co-existed ions and CO_3~(2-) concentrations demonstrated that U(VI) adsorption on C@HAp/Arg was weakly interfered by foreign ions and carbonate concentrations. More importantly,the adsorption performance of U(VI) on C@HAp/Arg was still over ~87% after five cycles. Therefore,it was noted that the versatile C@HAp/Arg could be potentially used as a powerful building block for the enrichment and disposal of U(VI) from aqueous solutions,which could efficiently reduce the potential toxicity of U(VI) in the U (VI)-contaminated water.
作者机构：
[Luo, Juan; Nie, Changming] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;[Lan, Jianhui; Wang, Congzhi; Chai, Zhifang; Zhao, Yuliang; Shi, Weiqun; Wu, Qunyan; Luo, Juan] Chinese Acad Sci, Lab Nucl Energy Chem, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Lan, Jianhui; Wang, Congzhi; Chai, Zhifang; Zhao, Yuliang; Shi, Weiqun; Wu, Qunyan; Luo, Juan] Chinese Acad Sci, Key Lab Biomed Effects Nanomat & Nanosafety, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Chai, Zhifang] Soochow Univ, Sch Radiol & Interdisciplinary Sci RAD X, Suzhou 215123, Peoples R China.;[Chai, Zhifang] Soochow Univ, Collaborat Innovat Ctr Radiat Med Jiangsu Higher, Suzhou 215123, Peoples R China.
通讯机构：
[Nie, Changming] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;[Shi, Weiqun] Chinese Acad Sci, Lab Nucl Energy Chem, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Shi, Weiqun] Chinese Acad Sci, Key Lab Biomed Effects Nanomat & Nanosafety, Inst High Energy Phys, Beijing 100049, Peoples R China.
关键词：
density functional theory;di-(2-ethylhexyl) phosphoric acid;actinide;lanthanide;solvent extraction
摘要：
Separation of trivalent lanthanides (Ln(III)) and actinides (An(III)) is a key issue in the advanced spent nuclear fuel reprocessing. In the well-known trivalent actinide lanthanide separation by phosphorus reagent extraction from aqueous komplexes (TALSPEAK) process, the organophosphorus ligand HDEHP (di-(2-ethylhexyl) phosphoric acid) has been used as an efficient reagent for the partitioning of Ln(III) from An(III) with the combination of a holdback reagent in aqueous lactate buffer solution. In this work, the structural and electronic properties of Eu~(3+) and Am~(3+) complexes with HDEHP in nitric acid solution have been systematically explored by using scalar-relativistic density functional theory (DFT). It was found that HDEHP can coordinate with M(III) (M=Eu, Am) cations in the form of hydrogen-bonded dimers HL_2~- (L=DEHP), and the metal ions prefer to coordinate with the phosphoryl oxygen atom of the ligand. For all the extraction complexes, the metal-ligand bonds are mainly ionic in nature. Although Eu(III) complexes have higher interaction energies, the HL_2~- dimer shows comparable affinity for Eu(III) and Am(III) according to thermodynamic analysis, which may be attributed to the higher stabilities of Eu(III) nonahydrate. It is expected that this work could provide insightful information on the complexation of An(III) and Ln(III) with HDEHP at the molecular level.
摘要：
Apocytochrome b(5) with a typical heme-binding motif of HPGG, and its variants with mutated motifs, GPGG, GPGH, HVGG, and HPGP, have been subjected to molecular dynamics simulation. Comparison of the dynamic consequences has revealed the crucial role of HPGG in assembling the heme group of cytochrome b5 and in modulating protein structure, property and function. (C) 2009 Ying Wu Lin. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
摘要：
Atherosclerotic lesions are characterized by the accumulation of abundant lipids and chronic inflammation. Previous researches have indicated that macrophage-derived lipoprotein lipase (LPL) promotes atherosclerosis progression by accelerating lipid accumulation and proinflammatory cytokine secretion. Although apelin-13 has been regarded as an atheroprotective factor, it remains unclear whether it can regulate the expression of LPL. The aim of this study was to explore the effects of apelin-13 on the expression of LPL and the underlying mechanism in THP-1 macrophage-derived foam cells. Apelin-13 significantly decreased cellular levels of total cholesterol, free cholesterol, and cholesterol ester at the concentrations of 10 and 100 nM. ELISA analysis confirmed that treatment with apelin-13 reduced pro-inflammatory cytokine secretion, such as interleukin-6 (IL-6), interleukin-1β (IL-1β) and tumor necrosis factor-alpha (TNF-α). It was also found that apelin-13 inhibited the expression of LPL as revealed by western blot and real-time PCR analyses. Bioinformatics analyses and dual-luciferase reporter assay indicated that miR-361-5p directly downregulated the expression of LPL by targeting the 3'UTR of LPL. In addition, apelin-13 + miR-361-5p mimic significantly downregulated the expression of LPL in cells. Finally, we demonstrated that apelin-13 downregulated the expression of LPL through activating the activity of PKCa. Taken together, our results showed that apelin-13 downregulated the expression of LPL via activating the APJ/PKCa/miR-361 -5p signaling pathway in THP-1 macrophage-derived foam cells, leading to inhibition of lipid accumulation and proinflammatory cytokine secretion. Therefore, our studies provide important new insight into the inhibition of lipid accumulation and pro-inflammatory cytokine secretion by apelin-13, and high-light appelin-13 as a promising therapeutic target in atherosclerosis.
摘要：
By retaining the native distal His64 in sperm whale myoglobin (Mb), a second distal histidine was engineered in Mb by mutating Leu29 to His29. The resultant mutant of L29H Mb exhibits an unusual enhanced peroxidase activity with a positive cooperativity in comparison to that of wild type Mb. The new enzyme with two cooperative distal histidines has not been found in native peroxidase, which emphasizes a creation of the rational protein design.
作者机构：
[Xu Jin-Sheng] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Yuan Ya-Li] Nanhua Univ, Coll Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Xu Jin-Sheng] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
镍(Ⅱ)配合物;晶体结构;热重分析
摘要：
The nickel complex Ni（phen）（H2O）3[C8H11O2（COO）] has been synthesized with bicycle[2.2.1]hept-2-en-5,6-dicarboxylic acid [C7H8（COOH）2] by means of solvent way. It crystallizes in the triclinic space group P1, with a=0.780 58（16） nm, b=1.189 9（2） nm, c=1.214 8（2） nm, α=66.20（3）°, β=88.28（3）°, γ=86.33（3）°, V=1.030 3（4） nm3, Dc=1.554 g·cm-3, Z=2, F（000）=502. Final GOF=1.107, R1=0.026 4, wR2=0.070 2. The crystal structure shows that the nickel ion is coordinated with four oxygen atoms from one bicycle [2.2.1]-2-hepten-5,6-dicarboxylic acid molecule and three water molecules, respectively, with two nitrogen atoms from the 1,10-phenanthroline molecule, forming a distorted octahedral coordination geometry. The result of TG analysis shows that the title complex was stable under 210.0 ℃.
作者：
He Ting-Ting;Li Bai;Xu Dian-Dou;Yang Xiao-Zhi;Ma Ling-Ling;Wang Hua-Jian;Wang Yan-Fei*
期刊：
分析化学,2011年39(4):491-495 ISSN：0253-3820
通讯作者：
Wang Yan-Fei
作者机构：
[Yang Xiao-Zhi; He Ting-Ting; Wang Yan-Fei] Univ S China, Coll Chem & Chem Engn, Hengyang 421001, Peoples R China.;[Li Bai; Xu Dian-Dou; Yang Xiao-Zhi; Wang Hua-Jian; He Ting-Ting; Ma Ling-Ling] Chinese Acad Sci, Key Lab Nucl Anal, Inst High Energy Phys, Beijing 100049, Peoples R China.
通讯机构：
[Wang Yan-Fei] Univ S China, Coll Chem & Chem Engn, Hengyang 421001, Peoples R China.
摘要：
LiCl-promoted superbase catalysts were found to be stable and highly selective to ethene for oxidative dehydrogenation of ethane, giving 84% ethane conversion and 74% ethene yield at 923 K. Results indicated that the stronger the basicity of LiCl-based catalysts, the better the catalytic performance
摘要：
Two series of 7-O-modified chrysin derivatives were prepared from 7-O-carboxymethyl chrysin(2a),7-O-carboxypropylchrysin(2b) and short-chain alcohols by using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride(EDCI), N-hydroxybenzotriazole(HOBt) and 4-dimethylamiopryidine(DMAP) as coupling reagents. Taking cisplatin as a reference substance, their anti-proliferative activities in vitro against human gastric carcinoma MGC-803 cells were evaluated by the standard 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) method. The results show that among the compounds tested, hepty 4-(5-hydroxy-4-oxo-2-phenyl-4Hchromen-7-yloxy) acetate(3f) displayed the most potent growth-inhibitory effect on MGC-803 cells with half maximal inhibitory concentration(IC_(50)) value of 3.23 μmol/L. The preliminary mechanism of inhibitory effect of compound 3f was also detected by flow cytometry(FCM), and the compound exerted anti- cancer activity via inducing the apoptosis of MGC-803 cells in a dose dependent manner, which suggested that compound 3f would be a potential anti-cancer agent.
