Adsorption and recovery of U(VI) from low concentration uranium solution by amidoxime modified Aspergillus niger
作者：
Li, Le;Hu, Nan;Ding, Dexin* ;Xin, Xin;Wang, Yongdong;...
期刊：
RSC Advances ,2015年5(81):65827-65839 ISSN：2046-2069
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Tan, Yan; Li, Le; Hu, Nan; Xin, Xin; Xue, Jinhua; Wang, Yongdong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Tan, Yan; Li, Le; Xue, Jinhua] 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.
摘要：
Amidoxime modified Aspergillus niger (AMAN) was prepared by the oximation reaction. The effects of the initial pH, contact time, initial U(vi) concentration and biosorbent dose on the adsorption of U(vi) ions from radioactive wastewater in U(vi) concentrations of less than 1 mg L<sup>-1</sup>by AMAN and the raw Aspergillus niger (RAN) were investigated. The maximum adsorption efficiency by AMAN for the 0.5 mg L<sup>-1</sup>U(vi) solution amounted to 98.85% under the optimum adsorption conditions, while the maximum adsorption efficiency by RAN was only 77.83%. The adsorption equilibrium data were found to be best fitted to Langmuir isotherm model, and the maximum biosorption capacity of AMAN for U(vi) was estimated to be 621 mg g<sup>-1</sup>at 298 K. The biosorption kinetics followed the pseudo-second order model and intraparticle diffusion equation. The Gibbs free energy change (ΔG°), enthalpy change (ΔH°) and entropy change (ΔS°) showed that the adsorption process of U(vi) was spontaneous, feasible and endothermic. The SEM-EDS study indicated that much more U(vi) ions were adsorbed by AMAN than by RAN. FT-IR study showed that the -NH<inf>2</inf>and =N-OH groups of amidoxime were the dominant ones for binding UO<inf>2</inf><sup>2+</sup>ions. Moreover, AMAN was found to have excellent selective adsorption capability of U(vi) due to amidoxime groups. The UO<inf>2</inf><sup>2+</sup>ions adsorbed by AMAN could be desorbed using 0.1 M HCl, and the desorption efficiency reaching 87.28% at the 8th cycle of adsorption and desorption. ©The Royal Society of Chemistry.
语种：
英文
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菌丝球形态的黑曲霉发酵液浸出铜尾砂
作者：
李广悦;刁宁宁;王永东;杜康;张振远
期刊：
化工学报 ,2015年66(2):717-722 ISSN：0438-1157
通讯作者：
Li, Guangyue(lgy673@163.com)
作者机构：
[李广悦; 刁宁宁; 王永东; 杜康; 张振远] Key Discipline Laboratory for National Defense of Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;Hunan;421001, China;School of Nuclear Resources Engineering, University of South China, Hengyang;[李广悦; 刁宁宁; 王永东; 杜康; 张振远] Hunan
关键词：
黑曲霉;菌丝球;发酵;浸出;铜尾砂;优化
摘要：
尾砂中含有大量的金属,是一种潜在的可利用资源。旨在研发一种从铜尾砂中回收铜的生物浸出方法。利用正交设计,通过摇瓶试验,研究培养温度、发酵时间、接种量及培养基成分对黑曲霉菌丝球形态的影响,进而研究不同菌丝球形态的黑曲霉发酵液对尾砂中铜的浸出。研究表明,铜的浸出率随着黑曲霉菌丝球直径的减小而升高。在温度30℃,接种量0.8%(OD_(600)=0.1),马铃薯-蔗糖含量30%,发酵时间65 h的优化发酵条件下,获得大量表面光滑、直径为0.96 mm的菌丝球;利用该条件下的发酵液,在30℃,180 r·min~(-1)条件下浸出3 d,铜的浸出率达83.25%。
语种：
中文
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1株尿素分解菌的分离及其生长特性
作者：
陈杰;李广悦;张振远;丁德馨;王永东;...
期刊：
微生物学杂志 ,2014年34(2):37-40 ISSN：1005-7021
作者机构：
[胡南; 李广悦; 王永东; 陈杰; 丁德馨; 张振远] 南华大学
关键词：
尿素水解;分离;生长特性
摘要：
利用微生物诱导碳酸钙沉淀（Microbially Induced Calcite Precipitation,MICP）进行岩土工程加固是一种绿色原位加固新技术。为获得用于MICP技术的菌株,采用选择性富集、平板分离法从土壤中分离了1株尿素分解菌,并研究了其生长特性。结果表明这株尿素分解菌的最适生长条件为初始pH值9,接种量4%,温度35℃,摇床转速200 r/min。
语种：
中文
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Adsorption of uranium ions from aqueous solution by amine-group functionalized magnetic Fe3O4 nanoparticle
作者：
Peng, G. W.* ;Ding, D. X.;Xiao, F. Z.;Wang, X. L.;Hun, N.;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2014年301(3):781-788 ISSN：0236-5731
通讯作者：
Peng, G. W.
作者机构：
[Peng, G. W.; Xiao, F. Z.; Wang, Y. D.; Ding, D. X.; Wang, X. L.; Hun, N.] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Cao, Z.; Dai, Y. M.] Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Peng, G. W.] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
会议名称：
Biennial Symposium on Nuclear and Radiochemistry
会议时间：
FEB 19-23, 2013
会议地点：
Jabalpur, INDIA
会议主办单位：
[Peng, G. W.;Ding, D. X.;Xiao, F. Z.;Wang, X. L.;Hun, N.;Wang, Y. D.] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.^[Dai, Y. M.;Cao, Z.] Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410004, Hunan, Peoples R China.
关键词：
Uranium ions;Amine-functionalization;Adsorption isotherm;Adsorption kinetics;Thermodynamics
摘要：
The magnetic Fe3O4 nanoparticle was functionalized by covalently grafting amine group with (3-aminopropyl) trimethoxy silane, and the Fe3O4-NH2 nanoparticle and the Fe 3O4 nanoparticle were characterized by Fourier transform infrared, and X-ray diffraction. And the results indicated the amine-group was immobilized successfully on the surface of Fe3O4. The adsorption behavior of uranium from aqueous solution by the Fe3O 4 nanoparticle and the Fe3O4-NH2 nanoparticle was investigated using batch experiments. The pH of initial aqueous solution at 5.0 and 6.0 were in favour of adsorption of uranium, and the adsorption percentage of uranium by the Fe3O4 nanoparticle and the Fe3O4-NH2 nanoparticle were 81.2 and 95.6 %, respectively. In addition, the adsorption of uranium ions could be well-described by the Langmuir, Freundlich isotherms and pseudo-second kinetic models. The monolayer adsorption maximum capacity of the Fe3O 4 nanoparticle and the Fe3O4-NH2 nanoparticle were 85.35 and 268.49 mg/g at 298.15 K, respectively, which indicate the adsorption capacity the Fe3O4 nanoparticle was improved by amine functionalization. © 2014 Akadémiai Kiadó.
语种：
英文
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Regularities for uranium leaching rate at different heights of column for leaching uranium from uranium ore
作者：
扶海鹰;丁德馨;叶勇军;李广悦;宋键斌;...
期刊：
中南大学学报(自然科学版) ,2014年45(6):1766-1771 ISSN：1672-7207
通讯作者：
Ding, D.(dingdxzzz@163.com)
作者机构：
[扶海鹰; 丁德馨; 叶勇军; 李广悦; 宋键斌; 胡南; 王永东] Key Discipline Lab for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, 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：
铀矿;柱浸;堆浸;数学模型;浸出率
摘要：
针对铀矿堆浸生产中矿堆不同高度上的铀金属浸出存在的延迟现象,采用理论分析和室内柱浸试验研究铀矿浸出试验柱不同高度上铀金属浸出的规律。理论分析将铀矿浸出试验柱沿柱高划分为若干个高度足够小且相等的单元体,使其中单个铀矿石颗粒的浸出符合收缩未反应核扩散控制系统模型,且任意1个单元体内所有铀矿石颗粒反应均匀,不存在延迟现象,进而以1个单元体为目标,根据溶浸剂质量守恒原理,并考虑初始溶浸剂浓度的变化,建立铀矿浸出试验柱不同高度上铀金属浸出的数学模型。采用颗粒半径为2.5 mm 的铀矿石进行串联柱浸试验。然后,采用数学模型对柱浸试验结果进行计算,并将模型计算结果与柱浸试验结果进行比较。研究结果表明:试验柱不同高度上铀金属浸出率存在较大差别,且模型计算值与柱浸试验值具有相同的变化趋势,表明该数学模型能较好地反映铀矿浸出试验柱不同高度上铀金属浸出的延迟规律,可为预测铀矿堆浸不同高度上的浸出率提供重要参考。
语种：
中文
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铀矿堆浸分形动力学模型
作者：
宋键斌;丁德馨;叶勇军;李广悦;扶海鹰;...
期刊：
原子能科学技术 ,2014年48(4):598-603 ISSN：1000-6931
通讯作者：
Ding, D.-X.(dingdxzzz@163.com)
作者机构：
[宋键斌; 丁德馨; 叶勇军; 李广悦; 扶海鹰; 胡南; 王永东] Key Discipline Lab for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, 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：
铀矿;堆浸铀矿石;粒径分布;分维数;动力学模型
摘要：
本文采用堆浸铀矿石粒径分布分维数代替其平均粒径,对M ellado等提出的矿石堆浸动力学模型进行了改进。同时采用铀矿柱浸试验确定了铀矿堆浸分形动力学模型参数与堆浸铀矿石粒径分布分维数的关系,建立了铀矿堆浸分形动力学模型,并进一步采用柱浸试验对模型进行了验证。结果表明,所建立的铀矿堆浸分形动力学模型能很好地反映铀矿堆浸铀金属浸出的规律。
语种：
中文
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3种不同植物与黑曲霉孢子联合去除水中U（Ⅵ）的研究
作者：
邓钦文;丁德馨;王永东;吕俊文;陈衍东
期刊：
环境科技 ,2014年(4):1-5 ISSN：1674-4829
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;[王永东; 陈衍东; 丁德馨; 吕俊文; 邓钦文] 南华大学
关键词：
黑曲霉孢子;协同修复;铀
摘要：
为探索降低铀（U）污染的新途径、新方法，选用白鹤芋、观音竹、碎米莎草进行水培实验。对3种不同植物联合黑曲霉孢子去除U（Ⅵ）以及外加碳源、氮源的影响因素进行了研究。结果表明，在12 d的培养期内，白鹤芋挂膜黑曲霉孢子对U的去除能力比其他2种植物要强，去除率高达98.13%。外加碳源、氮源的最佳组合为葡萄糖4 g、硫酸铵0.4 g。同时证明，微生物通过挂膜，联合植物协同修复U污染水体有可操作性。
语种：
中文
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耐辐射奇球菌对水中铀（Ⅵ）的吸附试验
作者：
邓钦文;丁德馨;刘冬;王永东
期刊：
金属矿山 ,2014年(1):150-153 ISSN：1001-1250
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;[王永东] 王永东;[丁德馨] 丁德馨;[邓钦文] 邓钦文
关键词：
耐辐射奇球菌;铀(Ⅵ);吸附
摘要：
为探索治理铀污染的新工艺、新方法,对耐辐射奇球菌吸附铀(Ⅵ)的影响因素进行了研究.结果表明,溶液的pH值、吸附时间和吸附剂投加量对铀去除率影响显著.在含铀(Ⅵ)模拟废水pH =5、吸附时间为180 min、初始浓度为50 mg/L的情况下,投加0.2 g/L的耐辐射奇球菌体吸附剂,铀(Ⅵ)吸附率可达92.30％;随着铀(Ⅵ)初始浓度的提高,铀吸附率微幅下降,吸附量几乎与铀(Ⅵ)浓度成正比.对吸附机理的探讨表明,耐辐射奇球菌对铀(Ⅵ)的吸附行为符合Freundlich等温模型和准二级动力学模型.
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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Vegetation composition and 226 Ra uptake by native plant species at a uranium mill tailings impoundment in South China
作者：
Hu, Nan;Ding, Dexin* ;Li, Guangyue;Zheng, Jifang;Li, Le;...
期刊：
Journal of Environmental Radioactivity ,2014年129:100-106 ISSN：0265-931X
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zheng, Jifang; Li, Le; Li, Guangyue; Hu, Nan; Wang, Yongdong; Zhao, Weichao] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
Bioremediation;pH;Radium;Soil pollution;Uranium;Field investigation;Hyperaccumulator;Mill tailings impoundment;Phytoremediation;Uranium mill tailings;Vegetation community;Vegetation community compositions;Vegetation composition;Vegetation;radium 226;transfer factor;uranium;biological uptake;community composition;fern;hyperaccumulation;impoundment;mill;mine drainage;pH;phytoremediation;radioactive pollution;radon isotope;soil pollution;tailings;uranium;Amaranthaceae;Anacardiaceae;Aquifoliaceae;article;Asteraceae;bracken fern;brake fern;chemical composition;China;Cyperaceae;Dryopteridaceae;Dryopteris;Dryopteris scottii;Euphorbiaceae;Hamamelidaceae;Lauraceae;Liliaceae;Malvaceae;Meliaceae;mine tailings;Moraceae;nonhuman;Oleaceae;Oxalidaceae;Papaveraceae;pH;Phytolaccaceae;phytoremediation;plant community;plant leaf;Plantaginaceae;Poaceae;Polygonaceae;Portulacaceae;Pteridaceae;Pteris multifida;radiation exposure;radioactive contamination;radioisotope distribution;Rosaceae;Salicaceae;sampling;Solanaceae;Ulmaceae;Urticaceae;vegetation;Verbenaceae;Zingiberaceae;China
摘要：
A field investigation was conducted for the vegetation composition and <sup>226</sup>Ra uptake by native plant species at a uranium mill tailings impoundment in South China. 80 species belonging to 67 genera in 32 families were recorded in the sampling sites. The Poaceae and Asteraceae were the dominant families colonizing the impoundment. The number of the plant species and vegetation community composition in the sampling sites seemed most closely related to the activities of <sup>226</sup>Ra and the pH value of the uranium tailings. The plant species in the sampling sites with relatively low activities of <sup>226</sup>Ra and relatively high pH value formed a relatively stable vegetation community. The plant species in the sampling sites with medium activities of <sup>226</sup>Ra and medium pH value formed the transitional vegetation community. The plant species in the sampling sites with relatively high activities of <sup>226</sup>Ra and relatively low pH value formed a simple unstable vegetation community that was similar to that on the unused grassland. The activities of <sup>226</sup>Ra and transfer factors (TFs) varied greatly with the plant species. The high activities of <sup>226</sup>Ra and TFs were found in the leaves of Pteris multifida (150.6Bq/g of AW;9.131), Pteridium aquilinum (122.2Bq/g of AW;7.409), and Dryopteris scottii (105.7Bq/g of AW;6.408). They satisfied the criteria for a hyperaccumulator for <sup>226</sup>Ra. They may be the candidates for phytoremediation of <sup>226</sup>Ra in the uranium mill tailings impoundment areas and the contaminated soils around. ©2014 Elsevier Ltd.
语种：
英文
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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;南华大学核资源工程学院;[王永东; 吕俊文; 邓钦文; 易敏涛] 南华大学
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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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;[胡南; 李广悦; 王永东; 丁德馨; 张振远] 南华大学
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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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 k1 is controlled by initial rate constant k0 and the increase rate parameter λ, and k0, λ and the length of the period for the first phase T1 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 k2 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;Genomics;Phylogenetic analysis;Ribosomal RNA;Paleogenetics;Bacterial genomics;Sequence alignment;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、—NH2、—PO4^3-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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