不同因素对膨润土吸附Cs^+性能的影响  

Effect of different factors on the adsorption of Cs^+ by bentonite

作　　者：刘红娟[1] 谢水波[2] 蒋亮[1] 唐泉[1] 夏良树[1] 刘迎九[2] 康玺[1] 

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]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

出　　处：《中国科技论文》2015年第12期1398-1402,共5页China Sciencepaper

基　　金：国家自然科学基金资助项目(11175081;21177053);高等学校博士学科点专项科研基金资助项目(20134324110003);湖南省高校创新平台基金资助项目(13K085);核技术及应用湖南省重点学科基金资助项目

摘　　要：采用静态批式法研究了不同pH值、Cs+浓度及固液比对膨润土吸附Cs+的影响,同时,利用傅里叶红外光谱(FTIR)、扫描电镜(SEM)、X射线能谱(EDS)和X射线衍射仪(XRD)分析了膨润土对Cs+的吸附过程。研究结果表明:Cs+初始浓度在100~500mg/L变化时,膨润土对Cs+的吸附效率由94.17%下降至47.09%,吸附量却从8.71mg/g上升至21.79mg/g;膨润土对Cs+的吸附效率与固液比存在正相关,当固液比在0.005~0.1变化时,膨润土对Cs+的吸附效率由39.96%增加至97.22%,而吸附量由23.48mg/g降至2.86mg/g;pH值增大时膨润土对Cs+的吸附性能加强,除了在pH值为7的时候略有下降,且吸附前溶液无论为酸性、中性还是碱性,吸附后溶液都呈中性。FTIR、SEM-EDS和XRD分析结果表明,膨润土吸附Cs+的过程主要表现为离子交换反应和表面配位反应。The adsorption of bentonite for Cs＋ was studied by batch technique under ambient conditions.The different concentra-tions of Cs＋ ,solid-to-liquid ratio and pH value on the sorption to bentonite was examined.The adsorption characteristics of Cs＋by Bentonite were analyzed by FTIR,SEM,EDX and XRD.The results show that the adsorption percentage of bentonite to Cae-sium decreases from 94.17% to 47.09%,but the adsorptive capacity increases from 8.71 mg/g to 21.79 mg/g when the initial Cs＋ concentration increases from 100 mg/L to 500 mg/L.The adsorptive capacity decreases from 23.48 mg/g to 2.86 mg/g and the adsorption percentage increases from 39.96% to 97.22% with the increasing of solid-to-liquid ratio from 0.005 to 0.1.The adsorptive capacity and adsorption percentage increase with the increasing of the pH value except for a little decrease at pH=7. By comparing the pH value before and after the adsorption of bentonite for cesium ion,the result shows that the pH value is neu-tral after the adsorption no matter the solution is acidic,neutral or alkaline before the adsorption of bentonite for Cs＋ .Therefore, bentonite as backfill material can reduce the corrosion of packaging container of metal by the acid and alkali.The results on FTIR, SEM,EDX and XRD show that the adsoprtion mechanism of Cs＋ with bentonite mainly can be ion exchange and surface combination.

关 键 词：膨润土 Cs+ 吸附机理 

分 类 号：X771[环境科学与工程—环境工程]