一株碳酸钙矿化菌的分离与鉴定
作者：
张振远;李广悦;丁德馨;王永东;胡南
期刊：
南华大学学报(自然科学版) ,2014年(2):30-33 ISSN：1673-0062
作者机构：
南华大学 核资源工程学院，湖南 衡阳421001;南华大学 铀矿冶生物技术国防重点学科实验室，湖南 衡阳421001
关键词：
岩土工程;碳酸钙矿化;分离;巴斯德芽孢杆菌
摘要：
基于微生物诱导碳酸钙沉积的岩土工程加固技术是一种环境友好的新技术。碳酸钙矿化菌是该技术应用的前提。为获得具有诱导碳酸钙沉积能力的菌株，采用选择性富集培养、平板分离方法从土壤中分离得到了一株具有尿素分解能力的菌株，细菌诱导产生的沉积物检测结果表明该菌株具有诱导碳酸钙沉积能力。通过形态学、革兰氏染色和16 S rDNA序列同源性分析鉴定该菌株为巴斯德芽孢杆菌。
语种：
中文
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大肠杆菌JM109对废水中铀（VI）的吸附实验研究
作者：
邓钦文;王永东;吕俊文;易敏涛
期刊：
南华大学学报(自然科学版) ,2014年(1):29-33 ISSN：1673-0062
作者机构：
南华大学 环境保护与安全工程学院,湖南 衡阳,421001;南华大学 核资源工程学院,湖南 衡阳,421001
关键词：
大肠杆菌JM109;吸附;铀
摘要：
利用大肠杆菌JM109去除含铀废水,研究了在pH值、温度、吸附时间、铀离子的初始浓度、菌体浓度等,耐辐射奇球菌对铀的吸附效果.吸附试验结果表明耐辐射奇球菌有较高的吸附铀的能力,其中对低浓度的含铀废水处理潜力较大.当pH值为4.5时吸附效果最好,投加菌体浓度最佳为0.1 g/L,大约50 min左右达到吸附平衡,吸附量最高达到693.8 mg/g.吸附热力学研究其更符合Freundlich等温模型,吸附过程符合准二级动力学模型.
语种：
中文
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Adsorption of U(VI) ions from low concentration uranium solution by thermally activated sodium feldspar
作者：
Li, Le;Ding, Dexin* ;Hu, Nan;Fu, Pingkun;Xin, Xin;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2014年299(1):681-690 ISSN：0236-5731
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Li, Le; Hu, Nan; Xin, Xin; Wang, Yongdong; Fu, Pingkun] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Li, Le] Univ South China, Sch Publ Hlth, Hengyang 421001, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Uranium;Sodium feldspar;Calcination;Adsorption;Low concentration uranium solution
摘要：
The thermally activated sodium feldspar (TASF), a novel material, was prepared by calcinating the micron sodium feldspar (SF) at 450 C for 45 min. The TASF and the SF were characterized using X-ray diffraction and mercury injection porosimetry, and the TASF was found to have larger specific surface area and larger porosity than SF. The effects of the initial pH, temperature, contact time and initial U(VI) ions concentration on the adsorption of U(VI) ions from the low concentration uranium solution by TASF were investigated. The maximum adsorption efficiency of TASF for 0.5 mg/L uranium solution amounted to 95.49 % when the initial pH was 5.0, the temperature, 318 K, and and the contact time, 600 min. The relationship between the adsorption capacity q e and equilibrium concentration C e can well be described by Freundlich equation. Adsorption isotherm and the analysis by FT-IR coupled with SEM revealed that U(VI) ions were adsorbed onto the surface of TASF in multimolecular or cluster states, and that the intraparticle diffusion occurred in spontaneous process. The basic thermodynamic parameters including free energy change, entropy change and enthalpy change were calculated to comprehend the intrinsic features and spontaneous nature of the adsorption process. The FT-IR spectroscopic characterization for the TASF indicated that many groups were involved in the adsorption process of U(VI) ions, and the -OH group played a more important role. The experimental results suggested that TASF had great adsorption efficiency and strong potentiality of enrichment and recovery for the low concentration U(VI). © 2013 Akadémiai Kiadó, Budapest, Hungary.
语种：
英文
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Removal and Recovery of U(VI) from Low Concentration Radioactive Wastewater by Ethylenediamine-Modified Biomass of Aspergillus niger
作者：
Ding, De Xin* ;Xin, Xin;Li, Le;Hu, Nan;Li, Guang Yue;...
期刊：
WATER AIR AND SOIL POLLUTION ,2014年225(12):1-16 ISSN：0049-6979
通讯作者：
Ding, De Xin
作者机构：
[Wang, Yong Dong; Li, Guang Yue; Ding, De Xin; Hu, Nan; Xin, Xin; Fu, Ping Kun] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Li, Le] Univ South China, Sch Publ Hlth, Hengyang 421001, Peoples R China.
通讯机构：
[Ding, De Xin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Aspergillus niger;Ethylenediamine;Biosorption;Low concentration radioactive wastewater;U(VI)
摘要：
In order to develop an effective and economical method for removing U(VI) from the low concentration radioactive wastewater with the U(VI) concentration of less than 1 mg L<sup>-1</sup>, the biomass of Aspergillus niger was prepared and modified with ethylenediamine, and the biosorption of uranium from the low concentration radioactive wastewater by the unmodified and the modified biomasses was investigated in a batch system. The modified biomass exhibited the adsorption efficiency of 99.25 % for uranium under the optimum conditions that pH was 5.0, the contact time was 150 min, and the biosorbent dose was 0.2 g L<sup>-1</sup>. The adsorption fitted well to Langmuir isotherm, and the maximum sorption capacity of the modified biomass for U(VI) was determined to be 6.789 mg g<sup>-1</sup> which increased by 36.45 % compared with the unmodified biomass. The adsorption kinetics was better depicted by pseudo-second-order kinetic model. The Gibbs free energy change (ΔG <sup>0</sup>), enthalpy change (ΔH <sup>0</sup>), and entropy change (ΔS <sup>0</sup>) showed that the process of U(VI) adsorption was spontaneous, endothermic, and feasible. The changes in the groups, morphology, and the presence of U(VI) on the surface of the adsorbents which were characterized by FT-IR, SEM, and EDS, demonstrated that the U(VI) was successfully adsorbed onto the modified biomass. Moreover, the UO<inf>2</inf> <sup>2+</sup> absorbed on the modified biomass can be released by 0.1 mol L<sup>-1</sup> HNO<inf>3</inf> with high desorption efficiency of 99.21 %. The results show that the modified biomass can remove U(VI) from low concentration radioactive wastewater more effectively than the unmodified biomass.
语种：
英文
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Uranium leaching using mixed organic acids produced by Aspergillus niger
作者：
Wang, Yong-dong;Li, Guang-yue* ;Ding, De-xin;Zhou, Zhi-xiang;Deng, Qin-wen;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2013年298(2):769-773 ISSN：0236-5731
通讯作者：
Li, Guang-yue
作者机构：
[Li, Guang-yue; Tan, Yan; Zhou, Zhi-xiang; Hu, Nan; Deng, Qin-wen; Ding, De-xin; Wang, Yong-dong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Li, Guang-yue] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
Aspergillus niger;Low-grade uranium ore;Mixed organic acids;pH;Temperature
摘要：
Both of culture temperature and pH value had impacts on the degree of uranium extraction through changing types and concentrations of mixed organic acids produced by Aspergillus niger, and significant interactions existed between them though pH value played a leading role. And with the change of pH value of mixed organic acids, the types and contents of mixed organic acids changed and impacted on the degree of uranium extraction, especially oxalic acid, citric acid and malic acid. The mean degree of uranium extraction rose to peak when the culture temperature was 25 C (76.14 %) and pH value of mixed organic acids was 2.3 (82.40 %) respectively. And the highest one was 83.09 %. The optimal culture temperature (25 C) of A. niger for uranium leaching was different from the most appropriate growing temperature (37 C). © 2013 Akadémiai Kiadó, Budapest, Hungary.
语种：
英文
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A kinetic model for heap leaching of uranium ore considering variation of model parameters with depth of heap
作者：
Ding, De-xin* ;Song, Jian-bin;Ye, Yong-jun;Li, Guang-yue;Fu, Hai-ying;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2013年298(3):1477-1482 ISSN：0236-5731
通讯作者：
Ding, De-xin
作者机构：
[Li, Guang-yue; Song, Jian-bin; Ye, Yong-jun; Hu, Nan; Ding, De-xin; Fu, Hai-ying; Wang, Yong-dong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
通讯机构：
[Ding, De-xin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Kinetic model;Uranium ore;Heap leaching;Model parameters;Heap depth
摘要：
Many kinetic models for heap leaching of low grade ores have been proposed and the model parameters have been treated as constants. However, some of these model parameters change with the depth of the heap. In the present work an apparatus consisted of six columns with different heights was designed and used to simulate the leaching behavior within a 3-m-high uranium ore heap at a uranium mine in South China. It was found that the model parameters α and ω for heap leaching of the uranium ore varied with the depth of the heap, and that the relationships between α and between ω and the depth of the heap were in the form of the logistic and the quadratic functions, respectively. Furthermore, a kinetic model for heap leaching of the uranium ore considering the variation of the model parameters with the depth of the ore was proposed. The kinetic model gave the fitting precision of more than 95 % and prediction precision of more than 93 %. The present work provided an approach for establishing the kinetic model for heap leaching of low grade uranium ores. © 2013 Akadémiai Kiadó, Budapest, Hungary.
语种：
英文
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A fractal kinetic model for heap leaching of uranium ore with fractal dimension of varied particle size distribution
作者：
Ding, De-Xin* ;Fu, Hai-Ying;Ye, Yong-Jun;Hu, Nan;Li, Guang-Yue;...
期刊：
Hydrometallurgy ,2013年136:85-92 ISSN：0304-386X
通讯作者：
Ding, De-Xin
作者机构：
[Fu, Hai-Ying; Li, Guang-Yue; Song, Jian-Bin; Ye, Yong-Jun; Hu, Nan; Ding, De-Xin; Wang, Yong-Dong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
通讯机构：
[Ding, De-Xin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Fractal kinetic model;Heap leaching;Fractal dimension;Uranium ore;Particle size distribution
摘要：
The varied particle size distribution of uranium ore for heap leaching, with its particle sizes ranging from 0 to 9 mm, is taken from a uranium mine in South China. Five uranium ore samples with the fractal dimensions (D) of particle size distribution of 1.6, 1.8, 2.0, 2.2 and 2.4, respectively, are further prepared by mixing different weights of the uranium ores for the size fractions of + 8/- 9, + 7/- 8, + 6/- 7, + 5/- 6, + 4/- 5, + 3/- 4, + 2/- 3, + 1/- 2, + 0.5/- 1 and - 0.5 mm, respectively. The five samples are leached in columns to investigate the influences of the fractal dimensions of particle size distribution on their leaching performances. The leaching data are analyzed using the shrinking core model, and the whole process of the column leaching is divided into two phases based on the pH and the potential vs. saturated calomel electrode (SCE) of the pregnant leach solution (PLS) from the columns. When the value of pH is greater than 2.0 and the potential vs. SCE is less than 400 mV, the leaching is in the first phase, the rate constant during the first phase k<inf>1</inf> is controlled by initial rate constant k<inf>0</inf> and the increase rate parameter λ, and k<inf>0</inf>, λand the length of the period for the first phase T<inf>1</inf> all have linear relationships with D. When the value of pH is less than or equal to 2.0 and the potential vs. SCE is greater than or equal to 400 mV, the leaching is in the second phase, and the rate constant during the second phase k<inf>2</inf> has non-linear relationship with D. From these analytical results, a fractal kinetic model for heap leaching of the uranium ore with fractal dimension of varied particle size distribution is established. And the experimental results show that the model is capable of predicting the recovery of uranium for heap leaching of uranium ore with fractal dimension of varied particle size distribution. ©2013 Elsevier B.V.
语种：
英文
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Comprehensive Genomic Characterization of Campylobacter Genus Reveals Some Underlying Mechanisms for its Genomic Diversification
作者：
Zhou, Yizhuang;Bu, Lijing;Guo, Min;Zhou, Chengran;Wang, Yongdong;...
期刊：
PLOS ONE ,2013年8(8):e70241- ISSN：1932-6203
通讯作者：
Chen, Liyu
作者机构：
[Zhou, Yizhuang; Guo, Min] BGI Shenzhen, Shenzhen, Guangdong, Peoples R China.;[Bu, Lijing] Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA.;[Zhou, Chengran] Sichuan Univ, Dept Biol, Chengdu 610064, Sichuan Provinc, Peoples R China.;[Wang, Yongdong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang, Hunan, Peoples R China.;[Chen, Liyu] Cent South Univ, Xiangya Sch Med, Dept Microbiol, Changsha, Hunan, Peoples R China.
通讯机构：
[Chen, Liyu] C;Cent South Univ, Xiangya Sch Med, Dept Microbiol, Changsha, Hunan, Peoples R China.
关键词：
Campylobacter;Phylogenetic analysis;Ribosomal RNA;Sequence alignment;Paleogenetics;Multiple alignment calculation;Sequence databases;Viral genomics
摘要：
Campylobacter species.are phenotypically diverse in many aspects including host habitats and pathogenicities, which demands comprehensive characterization of the entire Campylobacter genus to study their underlying genetic diversification. Up to now, 34 Campylobacter strains have been sequenced and published in public databases, providing good opportunity to systemically analyze their genomic diversities. In this study, we first conducted genomic characterization, which includes genome-wide alignments, pan-genome analysis, and phylogenetic identification, to depict the genetic diversity of Campylobacter genus. Afterward, we improved the tetranucleotide usage pattern-based naïve Bayesian classifier to identify the abnormal composition fragments (ACFs, fragments with significantly different tetranucleotide frequency profiles from its genomic tetranucleotide frequency profiles) including horizontal gene transfers (HGTs) to explore the mechanisms for the genetic diversity of this organism. Finally, we analyzed the HGTs transferred via bacteriophage transductions. To our knowledge, this study is the first to use single nucleotide polymorphism information to construct liable microevolution phylogeny of 21 Campylobacter jejuni strains. Combined with the phylogeny of all the collected Campylobacter species based on genome-wide core gene information, comprehensive phylogenetic inference of all 34 Campylobacter organisms was determined. It was found that C. jejuni harbors a high fraction of ACFs possibly through intraspecies recombination, whereas other Campylobacter members possess numerous ACFs possibly via intragenus recombination. Furthermore, some Campylobacter strains have undergone significant ancient viral integration during their evolution process. The improved method is a powerful tool for bacterial genomic analysis. Moreover, the findings would provide useful information for future research on Campylobacter genus.
语种：
英文
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Removal and recovery of uranium (VI) from aqueous solutions by immobilized Aspergillus niger powder beads
作者：
Ding, De-Xin* ;Tan, Xiang;Hu, Nan;Li, Guang-Yue;Wang, Yong-Dong;...
期刊：
Bioprocess and Biosystems Engineering ,2012年35(9):1567-1576 ISSN：1615-7591
通讯作者：
Ding, De-Xin
作者机构：
[Li, Guang-Yue; Tan, Yan; Hu, Nan; Tan, Xiang; Ding, De-Xin; Wang, Yong-Dong] Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Tan, Yan; Ding, De-Xin] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.;[Ding, De-Xin] Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 W Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ding, De-Xin] U;Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 W Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
关键词：
Biosorption;Uranium;Aspergillus niger;Equilibrium;Kinetics
摘要：
The immobilized Aspergillus niger powder beads were obtained by entrapping nonviable A. niger powder into Ca-alginate gel. The effects of pH, contact time, initial uranium (VI) concentration and biomass dosage on the biosorption of uranium (VI) onto the beads from aqueous solutions were investigated in a batch system. Biosorption equilibrium data were agreeable with Langmuir isotherm model and the maximum biosorption capacity of the beads for uranium (VI) was estimated to be 649.4 mg/g at 30 °C. The biosorption kinetics followed the pseudo-second-order model and intraparticle diffusion equation. The variations in enthalpy (26.45 kJ/mol), entropy (0.167 kJ/mol K) and Gibbs free energy were calculated from the experimental data. SEM and EDS analysis indicated that the beads have strong adsorption capability for uranium (VI). The adsorbed uranium (VI) on the beads could be released with HNO3 or HCl. The results showed that the immobilized A. niger powder beads had great potential for removing and recovering uranium (VI) from aqueous solutions. © Springer-Verlag 2012.
语种：
英文
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诱变绳状青霉吸附铀的行为研究
作者：
孙静;丁德馨;胡南;李广悦;王永东
期刊：
环境科学学报 ,2012年32(10):2384-2393 ISSN：0253-2468
通讯作者：
Ding, D.
作者机构：
[胡南; 李广悦; 王永东; 丁德馨; 孙静] 南华大学
通讯机构：
Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词：
生物吸附;诱变绳状青霉;铀;动力学;吸附机理
摘要：
先后采用盐酸羟胺和紫外光辐射,对绳状青霉(Penicillium funiculosum)进行诱变,并用红外光谱分析了诱变绳状青霉细胞表面官能团的变化,采用静态吸附试验研究了铀溶液的pH、温度、初始铀浓度、吸附时间、菌体投加量等因素对其吸附铀的影响.通过对动力学模型、等温吸附模型和热力学方程进行拟合,研究了诱变绳状青霉吸附铀的行为.采用扫描电镜、能谱仪和红外光谱仪分析了吸附前后诱变绳状青霉细胞表面的形貌、化学组成和官能团结构的变化,进而探讨了吸附过程可能涉及的反应机理.结果表明,诱变绳状青霉在pH=6时吸附铀的效果最好,8h即达到吸附平衡,最大吸附量为200mg·g~(-1),对铀的吸附为细胞表面的缔合—OH、—CHO、不饱和键、—NH_2、—PO_4~(3-)等与铀的配位络合反应.
语种：
中文
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五种水生植物对水中铀的去除作用
作者：
胡南;丁德馨;李广悦;王永东;李乐;...
期刊：
环境科学学报 ,2012年32(7):1637-1645 ISSN：0253-2468
通讯作者：
Ding, D.
作者机构：
[胡南; 丁德馨; 李广悦; 王永东; 李乐; 郑济芳] 南华大学铀矿冶生物技术国防重点学科实验室
通讯机构：
Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
会议名称：
中国核学会2011年年会
会议时间：
2011-10-11
会议地点：
贵阳
会议论文集名称：
中国核学会2011年年会论文集
关键词：
铀;水生植物;植物修复;满江红
摘要：
采用水培实验,研究了浮叶植物野生水葫芦（Eichhornia crassipes）、漂浮植物浮萍（Lemna minor L）、满江红（Azolla imbircata）、沉水植物菹草（Potamogeton crispus）、挺水植物空心莲子草（Alligator Alternanthera Herb）在初始铀浓度分别为0.15、1.50和15.00mg·L-1水中的生长状况及它们对水中铀的去除能力.结果表明,在21d的水培试验期内,满江红对铀表现出了最强的抗性,0.15、1.50和15.00mg·L-1的铀对满江红的生长抑制率分别只有4.56%、2.48%和6.79%,而满江红对水中铀的去除率分别达到了94%、97%和92%.进一步的试验表明,每1L水中种植7.5g满江红,可以获得最大的铀去除率,将初始铀浓度为1.25、2.50、5.00和10.00mg·L-1的水体降至国家排放标准（GB23727-2009）规定值（0.05mg·L-1）以下分别需要17、19、23和25d.研究结果为进一步开展铀污染水体植物修复的研究打下了基础.
语种：
中文
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A core-shell structured nanocomposite material for detection, adsorption and removal of Hg(II) ions in water
作者：
Li, Le;Tang, Shuangyang;Ding, Dexin* ;Hu, Nan;Yang, Shengyuan;...
期刊：
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY ,2012年12(11):8407-8414 ISSN：1533-4880
通讯作者：
Ding, Dexin
作者机构：
[Yang, Shengyuan; Tan, Yan; He, Shuya; Li, Le] Univ S China, Sch Publ Hlth, Hengyang 421001, Peoples R China.;[Tang, Shuangyang] Univ S China, Coll Med, Hengyang 421001, Peoples R China.;[Ding, Dexin; Li, Le; Hu, Nan; Sun, Jing; Wang, Yongdong] Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Yang, Shengyuan] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Fe_3O_4 Nanoparticles;Pyrene;Detection;Adsorption;Removal;Hg(II)
摘要：
In this paper, a core-shell structured nanocomposite material was prepared for the detection, adsorption and removal of Hg(II) ions in aqueous solution. The core was made from Fe<inf>3</inf>O<inf>4</inf> nanoparticles with superparamagnetic behavior and the outer shell was made from amorphous silica modified with pyrene-based sensing-probes. The material could detect and adsorb Hg(II) ions in aqueous solution due to its surface being modified with pyrene-based sensing-probes, and could easily be removed from the solution by magnetic force because of its core being made from magnetic Fe<inf>3</inf>O <inf>4</inf> nanoparticles. This multifunctional core-shell structure was confirmed and characterized by TEM, IR spectra, TGA, XRD and N<inf>2</inf> adsorption/desorption isotherms. Experiments were conducted on its functions of detection, adsorption and removal of Hg(II) ions in aqueous solution. The experimental results showed that this composite material had high sensitivity and unique selectivity to Hg(II), and that it could easily be removed from the solution. Copyright ©2012 American Scientific Publishers.
语种：
英文
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Removal and recovery of uranium from aqueous solution by tea waste
作者：
Ding, De-Xin* ;Liu, Xi-Tao;Hu, Nan;Li, Guang-Yue;Wang, Yong-Dong
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2012年293(3):735-741 ISSN：0236-5731
通讯作者：
Ding, De-Xin
作者机构：
[Li, Guang-Yue; Hu, Nan; Liu, Xi-Tao; Ding, De-Xin; Wang, Yong-Dong] Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Liu, Xi-Tao] Shandong Gold Grp, Jiaojia Gold Mine, Laizhou 264000, Peoples R China.
通讯机构：
[Ding, De-Xin] U;Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Tea waste;Uranium;Radioactive wastewater;Adsorption;Desorption;Kinetic;Adsorption isotherm
摘要：
Experiments on the removal and recovery of U(VI) from aqueous solution by tea waste were conducted. The adsorbent was characterized by scanning electron microscope and energy dispersive spectrometer before and after the adsorption treatment. The removal of U(VI) amounts to 86.80 % at optimum pH 6. The adsorption process reaches its equilibrium in 12 h at 308 K, and the kinetic characteristic can be described by the pseudo-second-order kinetic equation. The amount of adsorption increases from 22.92 to 142.21 mg g−1 with the decrease of tea waste dosage from 100 to 10 mg for solution with an initial uranium concentration of 50 mg L−1. Desorption for the four strippants is higher than 80 %. The equilibrium data are more agreeable with Freundlich isotherm than Langmuir isotherm.
语种：
英文
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茶渣吸附U(Ⅵ)的特性
作者：
刘希涛;李广悦;胡南;王永东;丁德馨
期刊：
化工学报 ,2012年63(10):3291-3296 ISSN：0438-1157
通讯作者：
Ding, D.(dingdxzzz@163.com)
作者机构：
[李广悦; 刘希涛; 丁德馨; 王永东; 胡南] Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China;[刘希涛] Jiaojia Gold Mine, Laizhou 264000, Shandong, China
通讯机构：
Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词：
茶渣;铀溶液;吸附动力学;等温吸附线
摘要：
通过静态吸附实验,考察了铀溶液初始pH、初始浓度以及吸附时间、吸附剂粒度、温度对茶渣吸附U(Ⅵ)的影响,分析了吸附过程的动力学行为及等温吸附特性,并通过红外光谱和扫描电镜探讨了吸附机理。结果表明:pH对茶渣吸附U(Ⅵ)的影响较大,pH为2和6时吸附量分别为13.90、43.19mg.g~(-1)。茶渣吸附U(Ⅵ)的过程较慢,吸附过程需要12h才能达到平衡。吸附过程的准二级动力学方程的拟合效果优于准一级动力学方程。吸附量随铀溶液浓度的增加而增大,而吸附率则相反。铀溶液初始浓度为10~100mg.L~(-1),相应的吸附量为9.40~70.05mg.g~(-1),吸附率为94.04%~70.05%。茶渣吸附U(Ⅵ)的动力学行为更符合准二级动力学方程,等温吸附数据对Freundlich方程的拟合度较高。茶渣粒度及温度对茶渣吸附U(Ⅵ)的影响不大。茶渣吸附U(Ⅵ)的过程中,起主要作用的基团有羟基、羰基、硝基、P—O、Si—O。
语种：
中文
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黑曲霉产有机酸浸出铀矿石的影响因素
作者：
王永东;李广悦;丁德馨;胡南;邓钦文;...
期刊：
化工学报 ,2012年63(5):1584-1591 ISSN：0438-1157
通讯作者：
Ding, D.(dingdxzzz@163.com)
作者机构：
[王永东; 李广悦; 丁德馨; 胡南; 邓钦文; 周支香] Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China
通讯机构：
Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词：
真菌;黑曲霉;有机酸;浸铀;影响因素
摘要：
为了解培养基种类、培养温度和pH值等因素对黑曲霉产生的混合有机酸浸出铀矿石的影响,从铀矿山水样中分离、纯化得到了一株真菌——黑曲霉,应用马铃薯-蔗糖培养基(potato sucrose agar,PSA)和葡萄糖-玉米浆培养基(dextrose corn syrup,PCS)进行黑曲霉培养,获得了不同培养温度下产生的pH值不同的黑曲霉产混合有机酸,并将之作为浸出剂用于浸铀实验研究.研究表明,黑曲霉产生的有机酸的主要组分为草酸和柠檬酸等有机酸,培养基种类的不同会影响黑曲霉所产有机酸的浸铀效果,采用PSA培养基培养的黑曲霉产生的有机酸浸铀效果更好(p＜0.05).培养温度和混合有机酸的pH值也会对黑曲霉代谢产物的铀浸出率有显著性影响(p＜0.05),且二者具有交互效应,pH值对铀浸出率的影响相对较大.应用PSA培养基时,最佳培养温度为25℃,最佳代谢产物pH值为2.3；应用PCS培养基时,最佳培养温度为30℃,最佳混合有机酸pH值为2.0.培养基种类、温度和pH值主要通过改变黑曲霉产生的有机酸的成分和含量对铀浸出率产生影响.
语种：
中文
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Screening of plant species for phytoremediation of uranium, thorium, barium, nickel, strontium and lead contaminated soils from a uranium mill tailings repository in South China
作者：
Li, Guang-yue;Hu, Nan;Ding, De-xin* ;Zheng, Ji-fang;Liu, Yu-long;...
期刊：
Bulletin of Environmental Contamination and Toxicology ,2011年86(6):646-652 ISSN：0007-4861
通讯作者：
Ding, De-xin
作者机构：
[Li, Guang-yue; Liu, Yu-long; Nie, Xiao-qin; Hu, Nan; Zheng, Ji-fang; Ding, De-xin; Wang, Yong-dong] Univ S China, Key Discipline Lab Natl Def Biol Technol Uranium, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ding, De-xin] U;Univ S China, Key Discipline Lab Natl Def Biol Technol Uranium, Hengyang 421001, Hunan, Peoples R China.
关键词：
Uranium;Thorium;Hyperaccumulator;Mill tailings;Phytoremediation factor
摘要：
The concentrations of uranium, thorium, barium, nickel, strontium and lead in the samples of the tailings and plant species collected from a uranium mill tailings repository in South China were analyzed. Then, the removal capability of a plant for a target element was assessed. It was found that Phragmites australis had the greatest removal capabilities for uranium (820 μg), thorium (103 μg) and lead (1,870 μg). Miscanthus floridulus had the greatest removal capabilities for barium (3,730 μg) and nickel (667 μg), and Parthenocissus quinquefolia had the greatest removal capability for strontium (3,920 μg). In this study, a novel coefficient, termed as phytoremediation factor (PF), was proposed, for the first time, to assess the potential of a plant to be used in phytoremediation of a target element contaminated soil. Phragmites australis has the highest PFs for uranium (16.6), thorium (8.68), barium (10.0) and lead (10.5). Miscanthus floridulus has the highest PF for Ni (25.0). Broussonetia papyrifera and Parthenocissus quinquefolia have the relatively high PFs for strontium (28.1 and 25.4, respectively). On the basis of the definition for a hyperaccumulator, only Cyperus iria and Parthenocissus quinquefolia satisfied the criteria for hyperaccumulator of uranium (36.4 μg/g) and strontium (190 μg/g), and could be the candidates for phytoremediation of uranium and strontium contaminated soils. The results show that the PF has advantage over the hyperaccumulator in reflecting the removal capabilities of a plant for a target element, and is more adequate for assessing the potential of a plant to be used in phytoremediation than conventional method. © 2011 Springer Science+Business Media, LLC.
语种：
英文
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铀矿石化学浸出与细菌浸出沉淀产物的比较
作者：
刘玉龙;丁德馨;李广悦;胡南;王永东;...
期刊：
过程工程学报 ,2010年10(4):679-684 ISSN：1009-606X
通讯作者：
Ding, D.-X.
作者机构：
[刘玉龙; 胡南; 王有团; 王清良; 李广悦; 丁德馨; 王永东] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, Hunan 421001, China
通讯机构：
[Ding, D.-X.] K;Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词：
铀矿石;化学浸出;细菌浸出;沉淀物
摘要：
为了研究细菌在铀矿石细菌浸出中的作用及产物, 设计了Fe~(2+)浓度分别为2.01和4.63 g/L的化学浸出和细菌浸出4种矿粉实验与Fe~(2+)浓度为4.63 g/L的化学浸出和细菌浸出2种矿块实验.监测了矿粉浸出体系中pH值、Eh值及铀浓度随时间的变化, 并对铀矿石化学浸出和细菌浸出的矿块表面形貌、元素及矿物组成进行了分析.结果表明, 在4种矿粉浸出体系中, Fe~(2+)浓度分别为2.01和4.63 g/L的化学浸出铀矿石浸出率分别为64.86%和69.13%, 细菌浸出浸出率分别为94.35%和92.80%.试块化学浸出后表面主要为硅酸盐类矿物, 细菌浸出后表面主要是黄钾铁矾类矿物.细菌浸出体系中含适量铁可有效降低沉淀量, 提高浸出率
语种：
中文
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Metal pollution in Huayuan river in Hunan province in China by manganese sulphate waste residue
作者：
Hu, Nan;Zheng, Ji-Fang* ;Ding, De-Xin;Liu, Jun;Yang, Lu-Qing;...
期刊：
Bulletin of Environmental Contamination and Toxicology ,2009年83(4):583-590 ISSN：0007-4861
通讯作者：
Zheng, Ji-Fang
作者机构：
[Li, Guang-Yue; Liu, Yu-Long; Yin, Jie; Zheng, Ji-Fang; Yang, Lu-Qing; Hu, Nan; Ding, De-Xin; Liu, Jun; Wang, Yong-Dong] Univ S China, Key Discipline Lab Natl Def Biol Technol Uranium, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Zheng, Ji-Fang] U;Univ S China, Key Discipline Lab Natl Def Biol Technol Uranium, Hengyang 421001, Hunan, Peoples R China.
关键词：
Huayuan River;Manganese sulphate waste residue;Sediment;Speciation;Water pollution
摘要：
The Huayuan River in Hunan Province in China is subject to ongoing mining activity with Mn extraction. In this study, the level and environmental significance of metals (including Mn, Cd, Pb, Cu, Zn, Ni and Fe) concentrations in the surface water and river sediments have been investigated along a 187 km reach of the Huayuan River. Using the X-ray fluorescence (XRF) analysis, we analyzed the characterization of metals in manganese sulphate waste residue (MSWR) deposited along the bank of Huayuan River. The speciation of metals in both sediment and MSWR was established using the BCR-three step sequential extraction procedure. In the water samples, the average concentrations of Mn, Cd and Pb exceeded the acceptable concentrations for drinking water in the WHO Guidelines for drinking water quality, Vol. 1, Recommendations, Geneva (2004) and Chinese (GB 5749-2006) guidelines, respectively. The average concentrations of Mn, Cd, Pb and Zn in the river sediments were found to be considerably higher than the corresponding world average shale values. The percentages of Cd (31.4%), Mn (31.1%), Zn (12.8%) and Pb (8.1%) associated with exchangeable and weak acid fraction in the sediments were higher than other metals. Mn (5.81%), Zn (0.208%), Pb (0.0292%) and Cd (0.0113%) were identified in MSWR by XRF analysis. The percentages of Mn, Cd, Zn and Pb associated with the exchangeable and weak acid soluble fraction in MSWR were 41.9%, 31.1%, 23.8% and 9.8%, respectively. The peak solute and sediment-bound metal concentrations were found at the sites of MSWR deposited along the bank of Huayuan River. The results suggested that MSWR deposited along the bank may have a closely relation with the metal pollution of Huayuan River. The results obtained may be useful to assess both short and long-term environmental impact of the MSWR deposited activities and support decisions for a future remediation of this river. © 2009 Springer Science+Business Media, LLC.
语种：
英文
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嗜酸氧化亚铁硫杆菌在沥青铀矿石浸出中的作用
作者：
丁德馨;刘玉龙;李广悦;胡南;王永东;...
期刊：
化工学报 ,2009年60(11):2903-2910 ISSN：0438-1157
通讯作者：
Ding, D.(dingdx@nhu.edu.cn)
作者机构：
[丁德馨; 刘玉龙; 李广悦; 胡南; 王永东; 王有团] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China
通讯机构：
Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词：
沥青铀矿石;嗜酸氧化亚铁硫杆菌;细菌浸出;能谱分析
摘要：
为了研究沥青铀矿石的细菌浸出机理,设计了有菌有铁、有菌无铁及无菌无铁3种矿粉浸出试验及有菌无铁、无菌无铁两种试块浸出试验,检测了矿粉浸出体系中细菌的浓度、pH值、Eh、亚铁离子浓度、总铁离子浓度及铀浓度的变化,分析了浸出尾渣中O、Mg、K、P、S、Fe、U等元素的含量,观测了浸出前后试块表面形貌的变化.结果表明,在沥青铀矿石浸出过程中,嗜酸氧化亚铁硫杆菌可以高效氧化浸出体系中的亚铁、还原态硫及元素硫,使得浸出体系中的Eh升高和pH值降低;有菌有铁浸出体系中,高浓度的细菌、高浓度的铁、低pH值和高Eh可加速铀矿石的浸出和提高铀矿石的浸出率;有菌无铁浸出体系中,即使总铁离子浓度很低,但由于有细菌的存在,同样可以加速铀矿石的浸出和提高铀矿石的浸出率.有菌无铁的试块浸出中,试块表面出现了许多溶蚀坑,这表明细菌对铀矿石具有直接氧化作用.
语种：
中文
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沥青铀矿石细菌浸出机理的实验研究
作者：
丁德馨;李广悦;刘玉龙;王永东;王有团
期刊：
过程工程学报 ,2008年8(5):859-865 ISSN：1009-606X
通讯作者：
Ding, D.-X.(dingdx@nhu.edu.cn)
作者机构：
[丁德馨; 王有团; 李广悦; 王永东; 刘玉龙] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
通讯机构：
[Ding, D.-X.] K;Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词：
氧化亚铁硫杆菌;沥青铀矿石;浸铀机理;浸出率;间接作用
摘要：
采用氧化亚铁硫杆菌作为实验菌，针对有菌有Fe~(2＋)、有菌无铁、无菌有Fe~(3＋)、无菌有Fe~(2＋)、不控制pH值的无菌无铁和pH值控制在2.0的无菌无铁6种沥青铀矿石浸出体系，考察了浸出过程中细菌的浓度、溶液pH值、电位、亚铁离子浓度、全铁离子、铀浓度等参数的变化，得到铀矿石的浸出率分别为98.00％，80.33％，97.66％，93.00％，20.33％，72.00％。结果表明，在沥青铀矿石的细菌浸出中，细菌的作用以间接作用为主，即细菌把还原态的硫或单质硫及Fe~(2＋)氧化成Fe_2（SO_4）_3。由于Fe_2（SO_4）_3是一种强氧化剂，将不溶的U（Ⅳ）氧化为可溶解的U（Ⅵ），从而使沥青铀矿石中的铀得以浸出。
语种：
中文
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