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凌辉,唐振平,谢水波,刘金香,刘迎九,荣丽杉.铁负载膨润土对铀(VI)的吸附特性及机理研究[J].南华大学学报(自然科学版),2014,28(3):26~32.[LING Hui,TANG Zhen-ping,XIE Shui-bo,LIU Jin-xiang,LIU Ying-jiu,RONG Li-shan.Adsorption Characteristics and Mechanism of Uraniumby Fe-immobilized Bentonite[J].Journal of University of South China(Science and Technology),2014,28(3):26~32.]

铁负载膨润土对铀(VI)的吸附特性及机理研究

Adsorption Characteristics and Mechanism of Uraniumby Fe-immobilized Bentonite

投稿时间：2014-03-04

DOI：

中文关键词: 铁负载膨润土吸附铀(VI) 机理

英文关键词:Fe-immobilized bentonite adsorption U(VI) mechanism

基金项目:国家自然科学基金资助项目(11175081);湖南省自然科学基金资助项目(13JJ3078);湖南省教育厅基金资助项目(11C1087);湖南省研究生科研创新基金资助项目(2011SCX07)

作者	单位
凌辉	南华大学污染控制与资源化技术湖南省高校重点实验室,湖南衡阳 421001
唐振平	南华大学污染控制与资源化技术湖南省高校重点实验室,湖南衡阳 421001
谢水波	南华大学污染控制与资源化技术湖南省高校重点实验室,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
刘金香	南华大学污染控制与资源化技术湖南省高校重点实验室,湖南衡阳 421001
刘迎九	南华大学污染控制与资源化技术湖南省高校重点实验室,湖南衡阳 421001
荣丽杉	南华大学污染控制与资源化技术湖南省高校重点实验室,湖南衡阳 421001

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中文摘要:

采用膨润土经提纯、钠化及负载铁等过程制备铁负载膨润土,通过静态吸附实验研究了pH、离子强度、吸附剂投加量、U(VI)初始浓度、阳离子Ca²⁺、Mg²⁺以及阴离子CO₃2-、HCO-₃等对铁负载膨润土吸附模拟废水中U(VI)的影响,进行了吸附过程动力学、热力学分析,并利用傅里叶红外光谱(FT-IR)、扫描电镜(SEM)探讨了相关吸附机理.试验结果表明,pH值和离子强度是影响吸附效果的重要因素,当溶液pH为6,离子强度为0.01 mol/L NaNO₃,U(VI)初始浓度为19.08 mg/L,铁负载膨润土投加量为0.2 g/L,24 h吸附量达到88.06 mg/g.当pH<6时,Ca²⁺、Mg²⁺、CO₃2-、HCO-₃的存在分别降低了铁负载膨润土对U(VI)的吸附效果,而pH>7时影响作用不大.准二级动力学和Langmuir等温吸附模型对铁负载膨润土吸附U(VI)的拟合效果较好,SEM和FT-IR分析结果表明铁负载膨润土主要通过羟基络合及离子交换作用结合U(VI)进入其层间及表面.

英文摘要:

The Fe-immobilized bentonite was prepared by purification,sodium and load of iron compounds.The adsorption properties of U(VI) onto Fe-immobilized bentonite was investigated at various conditions of initial solution pH,ionic strength,adsorbent dosage U(VI) concentration,as well as adding Ca²⁺,Mg²⁺,CO₃2-,HCO-₃ by batch technique.Conducted adsorption kinetics,thermodynamics analysis,Fe-immobilized before and after adsorption were characterized by Scanning Electrion Microscope(SEM) and Fourier Transform Infrared Spectra(FT-IR).Results indicated that the adsorption capacity were strongly affected by the solution pH and ion strength,the adsorption capacity reached 88.06 mg/g after 24 h when U(VI) concentration was 19.08 mg/L and Fe-immobilized bentonite dosage was 0.2 g/L.The common ions of Ca²⁺,Mg²⁺,CO₃2-,HCO-₃ in natural water reduced the adsorption of U(VI) by Fe-immobilized bentonite as pH<6,but had no significant effect as pH>7.The adsorption kinetics process was fitted well with the second-order kinetic equation,simultaneously the Langmuir equations could describe the adsorption isotherm of U(VI) well.Based on SEM and FT-IR instruments,we found U(VI) main entry bentonite layer and surface by hydroxy complex and ion exchange.

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