白云石与方沸石对Sr 2+的吸附行为研究  

Adsorption of Sr^(2+) on Dolomite and Analcime

作　　者：董阳 王慧琳 赵帅维[1] 贺含毅 贾梅兰[1] 刘军[2] 廖家莉[2] 杨吉军[2] 杨远友[2] 李洪辉[1] 刘宁[2] DONG Yang;WANG Huilin;WANG Huilin;HE Hanyi;JIA Meilan;LIU Jun;LIAO Jiali;YANG Jijun;YANG Yuanyou;LI Honghui;LIU Ning(China Institute for Radiation Protection,Taiyuan 030006,China;Institute of Nuclear Science and Technology,Key Laboratory of Radiation Physics and Technology, Ministry of Education,Sichuan University,Chengdu 610064,China)

机构地区：[1]中国辐射防护研究院,山西太原030006 [2]四川大学原子核科学技术研究所,辐射物理及技术教育部重点实验室,四川成都610064

出　　处：《原子能科学技术》2018年第11期1942-1948,共7页Atomic Energy Science and Technology

摘　　要：采用静态实验法研究了黏土岩的组成矿物白云石和方沸石对Sr^(2+)的吸附行为,考察了时间、初始pH值、初始浓度、离子强度以及腐殖酸对吸附的影响,并利用XRD、FT-IR和SEM对材料进行了表征。结果表明:两种材料均能有效吸附Sr^(2+),初始pH值升高会促进吸附,离子强度增大会抑制两种材料对Sr^(2+)的吸附;吸附均在6d时达到平衡,吸附过程均符合准二级动力学模型,说明吸附均以化学吸附为主;随着Sr^(2+)初始浓度的增加,白云石吸附Sr^(2+)的吸附分配比呈先增加后降低的趋势,方沸石吸附Sr^(2+)的吸附分配比不断降低;腐殖酸会抑制白云石吸附Sr^(2+),对方沸石吸附Sr^(2+)的过程略有促进;Langmuir和Freundlich模型拟合结果显示,白云石吸附Sr^(2+)的吸附机理较为复杂,而Sr^(2+)在方沸石上的吸附过程为单分子层吸附。上述结果可为高放废物地质处置的选址工作提供基础数据和参考。The adsorption behavior and the effect of various experimental conditions on Sr 2+adsorption on dolomite and analcime were investigated respectively with batch sorption method,and XRD,FT-IR and SEM were carried out.The results show that dolomite and analcime can adsorb Sr 2+effectively,and the adsorption increases with the increase of initial pH and decreases with the increase of ionic strength.The adsorption equilibrium both are achieved after 6 d.The adsorption processes both are well described by pseudo-second-order kinetics model,which indicates that the adsorption processes may be chemical adsorption.As the increase of the initial concentration of Sr 2+,the K d of Sr 2+on dolomite increases first and then decreases,and the K d of Sr 2+on analcime decreases.With the increase of humic acid,the K d of Sr 2+on dolomite decreases,but the K d of Sr 2+on analcime increases slightly.Langmuir and Freundlich isotherm model results show that the adsorption mechanism of Sr 2+on dolomite is relatively complex,and it is monolayer for analcime.The results can provide basic data and reference for the site selection of high level waste.

关 键 词：白云石 方沸石 Sr2+ 吸附 

分 类 号：TL93[核科学技术—辐射防护及环境保护]