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Surface complexation modeling of Eu(Ⅲ) adsorption on silica in the presence of fulvic acid

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science china Chemistry 2014年第9期57卷 1276-1282页

作者： YE YuanLv CHEN ZongYuan MONTAVON Gilles JIN Qiang guo zhijun {2. wangsuo radiochemistry laboratory School of Nuclear Science and TechnologyLanzhou University laboratoire SUBATECH UMR 6457 CNRS-IN2P3/Ecole des Mines de Nantes/PRES UNAM4 rue A. Kastler 44307 Nantes CedexFrance

Humic substances （HS） substantially affect heavy metal （M） adsorption on mineral surfaces. However, quantitative descriptions of ternary systems involving M, HS and mineral surfaces remain unclear. This study examines adsorption in a model ternary system including Eu（III）, fulvic acid （FA） and silica, and describes the adsorption of Eu（III） and FA by combining a double-layer model （DLM） and the Stockholm humic model （SHM）. SHM explains the binding of H＋ and Eu^3＋ to EA and the DLM for FA and Eu（Ill） adsorption on silica. Experimental results showed that the presence of FA promotes Eu（III） adsorp- tion at acidic pH values, but decreases it at basic pH values, which indicates the formation of ternary surface complexes. Modeling calculations have shown that two ternary surface complexes are required to describe the experimental results in which Eu^3＋ acts as a bridge between the surface site and FA. The present study suggests that the discrete-site approach to HS is a promising method for interpreting the adsorption data for M, HS and mineral ternary systems.

关键词： Eu(III) fuivic acid adsorption silica Stockholm humic model

Influence of FeCl_3 on radiation stability of ionic liquid BmimCl

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Chinese science Bulletin 2013年第10期58卷 1150-1155页

作者： HUANG Lei HUANG Wei FU HaiYing wu guoZhong guo zhijun wu wangsuo CHEN shiMou Shanghai Institute of Applied Physics Chinese Academy of Sciences radiochemistry labaratory School of Nuclear Science and TechnologyLanzhou University Institute of Process Engineering Chinese Academy of Sciences

This study investigates the effect FeCl3 on the radiation stability of the ionic liquid,1-butyl-3-methylimidazolium chloride(BmimCl) over a wide dose range of 0 to 1000 kGy under γ-ray *** ionic liquid species,BmimFeCl4,was formed by adding FeCl3 into *** results showed that the presence of FeCl4-significantly improved the radiation resistance of BmimCl,wherein the effect was more pronounced at higher ***,under irradiation,Fe(II) was generated from Fe(III),which was reduced by solvated *** addition,the concentration of Fe(II) increased with low level of absorbed dose,but leveled off at higher ***,the radiation yield of the solvated electrons of BmimCl was further estimated at approximately 0.358±0.01 μmol/J in BmimCl-7 mol% FeCl3 system.

关键词：辐射稳定性三氯化铁离子液体甲基咪唑射线辐射耐辐射性浓度增加溶剂化

china's progress in radionuclide migration study over the past decade(2.10–2.2.):Sorption,transport and radioactive colloid

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Chinese Chemical Letters 2022年第7期33卷 3405-3412页

作者： Zongyuan Chen Siyuan wang Huijuan Hou Kang Chen Pengyuan Gao Zhen Zhang Qiang Jin Duoqiang Pan zhijun {2. wangsuo wu Frontiers science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China The Key laboratory of Special Function Materials and Structure Design Ministry of EducationLanzhou UniversityLanzhou 730000China radiochemistry laboratory School of Nuclear Science and TechnologyLanzhou UniversityLanzhou 730000China

The radionuclide(RN)migration study is not only helpful to understand environmental behavior of RNs,but also can establish the basis for the safety assessment of geological disposal of high-level radioactive waste(HLW).In the context of china’s HLW disposal,this review briefly summaries the progress of china’s RN migration studies over the past decade regarding three aspects,RN sorption,RN transport and radioactive *** studies from other disciplines(such as geology and environmental {2.)are also included in this review because they can provide references for the RN migration ***,china has achieved clear progress in RN migration study over the past decade,although large-scaled field experiments are lacked and a gap still exists comparing with the international advanced ***,several suggestions are proposed for future RN migration research in china.

关键词： High-level radioactive waste Sorption Transport Colloid Spectroscopic analysis Theoretical calculation

Modeling of radionickel sorption on MX-80 bentonite as a function of pH and ionic strength

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science china Chemistry 2009年第3期52卷 362-371页

作者： SHAO DaDong XU Di wang SuoWei FANG QiaoHui wu {2. DONG YunHui wang XiangKe Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China College of Chemical Engineering Shandong University of TechnologyZibo 255049China radiochemistry laboratory School of Nuclear Science and TechnologyLanzhou UniversityLanzhou 730000China

MX-80 bentonite was detected using acid-based titration, XRD and FTIR in detail. The sorption behavior of 63Ni(II) from aqueous solution to MX-80 bentonite was investigated as a function of solid content, ionic strength and pH by using batch technique. The experimental data of 63Ni(II) sorption on MX-80 bentonite was obtained using the diffuse layer model (DLM) with the aid of FITEQL 3.1 program. The results indicated that the sorption of 63Ni(II) on MX-80 bentonite was mainly dominated by surface complexation, and cation exchange also contributed partly to 63Ni(II) sorption at low pH values. The sorption isotherms were simulated by Langmuir and Freundlich models, and the results indicated that Freundlich isotherm model fitted the sorption data better than the Langmuir isotherm model. The results are crucial to evaluate the sorption and migration of radionickel in MX-80 bentonite.

关键词： MX-80 bentonite radionickel acid-based titration sorption modeling

Sorption of uranyl ions on TiO_2.Effects of pH,contact time,ionic strength,temperature and HA

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Journal of Environmental sciences 2019年第1期31卷 115-123页

作者： Jingjing wang Bihong He Xiaoyan Wei Ping Li Jianjun Liang shirong Qiang Qiaohui Fan {2. wu radiochemistry laboratory School of Nuclear Science and Technology Lanzhou University Key laboratory of Petroleum Resources Gansu Province/Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences Key laboratory of Preclinical Study for New Drugs of Gansu Province Institute of Physiology School of Basic Medical SciencesLanzhou University

Sorption of U(VI) onto TiO_2.as functions of pH, ionic strength, contact time, soil humic acid(SHA), solid-to-liquid ratio and temperature was studied under ambient conditions using batch and spectroscopic approaches. The sorption of U(VI) on TiO_2.was significantly dependent on pH and ionic strength. The presence of SHA slightly enhanced the sorption of U(VI) on TiO_2.below pH 4.0, while it inhibited U(VI) sorption in the higher pH range. U(VI)sorption on TiO_2.was favored at high temperatures, and the sorption process was estimated to be endothermic and spontaneous. Reduction of U(VI) to lower valent species was confirmed by X-ray photo-electron spectroscopy analysis. It is very interesting to find that U(VI) sorption on TiO_2.was promoted in solutions with higher back-ground electrolyte concentrations. In the presence of U(VI), higher back-ground electrolyte made more TiO_2.particles aggregate through(001) facets, leading more(101) facets to be exposed. Therefore, the reduction of U(VI) was enhanced by the exposed(101) facets and more U(VI) removal was observed.

关键词： Sorption Uranium TiO2 Ionic strength Soil humic acid

Synthesis of novel nanomaterials and their application in efficient removal of radionuclides

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science china Chemistry 2019年第8期62卷 933-967页

作者： Xiangxue wang Long Chen Lin wang Qiaohui Fan Duoqiang Pan Jiaxing Li Fangting Chi Yi Xie Shujun Yu Chengliang Xiao Feng Luo Jun wang Xiaolin wang Changlun Chen wangsuo wu Weiqun shi Shuao wang Xiangke wang Key laboratory of Resources and Environmental Systems Optimization Ministry of EducationCollege of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China china Academy of Engineering Physics Mianyang 621900China State Key L aboratory of Radiation Medicine and Protection School of Radiation Medicine and ProtectionCollaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China laboratory of nuclear Energy Chemistry and Key laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Key laboratory of Petroleum Resources Gansu ProvinceNorthwest Institute of Eco-Environment and Resources. Chinese Academy of SciencesLanzhou 730000China radiochemistry laboratory School of Nuclear Science and TechnologyLanzhou UniversityLanzhou 730000China CAS Key laboratory of Photovoltaic and Energy Conservation Materials. Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031China Fundamental science on nuclear Wastes and Environmental Safety {2.oratory Southwest University of Science and Technology Mianyang 621010China State Key laboratory of nuclear Resources and Environment School of BiologyChemistry and Material Science East China University of TechnologyFuzhou 344000China College of Materials science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China china Academy of Engineering Physics Mianyang 621900China

With the development of nuclear energy, large amounts of radionuclides are inevitably released into the natural environment. It is necessary to eliminate radionuclides from wastewater for the protection of environment. Nanomaterials have been considered as the potential candidates for the effective and selective removal of radionuclides from aqueous solutions under complicated conditions because of their high specific surface area, large amounts of binding sites, abundant functional groups, pore-size controllable and easily surface modification. This review mainly summarized the recent studies for the synthesis, fabrication and surface modification of novel nanomaterials and their applications in the efficient elimination and solidification of radionuclides,and discussed the interaction mechanisms from batch experiments, spectroscopy analysis and theoretical calculations. The sorption capacities with other materials, advantages and disadvantages of different nanomaterials are compared, and at last the perspective of the novel nanomaterials is summarized.

关键词： nanomaterials radionuclides removal preconcentration interaction mechanism

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Cs(Ⅰ)在桃花江水底沉积物上的吸附模型

原子能科学技术 2019年第10期53卷 1788-1796页

作者：靳强杨俊威高超张震陈宗元郭治军吴王锁兰州大学核科学与技术学院放射化学与核环境研究所甘肃兰州730000 兰州大学特殊功能材料与结构设计教育部重点实验室甘肃兰州730000

通过批式吸附实验研究了接触时间、固液比、溶液pH值、离子强度、温度、Cs(Ⅰ)浓度和沉积物组分等对Cs(Ⅰ)在桃花江水底沉积物上吸附作用的影响。结果表明,样品中黏土组分含量和溶液离子强度对Cs(Ⅰ)吸附影响显著,而溶液pH值和温度对Cs(... 详细信息

通过批式吸附实验研究了接触时间、固液比、溶液pH值、离子强度、温度、Cs(Ⅰ)浓度和沉积物组分等对Cs(Ⅰ)在桃花江水底沉积物上吸附作用的影响。结果表明,样品中黏土组分含量和溶液离子强度对Cs(Ⅰ)吸附影响显著,而溶液pH值和温度对Cs(Ⅰ)吸附几乎无影响,说明Cs(Ⅰ)的吸附机理为黏土上的阳离子交换作用;Cs(Ⅰ)在桃花江水底沉积物上的解吸具有滞后性,解吸速率明显小于吸附速率。利用磨损边缘-基面位点概念模型的框架,构建了Cs(Ⅰ)在桃花江水底沉积物上的吸附模型。研究所得结果有助于精确预测Cs(Ⅰ)在桃花江水底沉积物上的吸附作用,为桃花江核电厂的周围水体质量评价、废水排放标准建立和核事故应急处理提供了基础数据和参考模型。

关键词： Cs(Ⅰ) 桃花江核电厂桃花江水底沉积物吸附建模