Cs(Ⅰ)在桃花江水底沉积物上的吸附模型  

Adsorption Model of Cs(Ⅰ) on Taohuajiang Sediment

作　　者：靳强[1,2] 杨俊威[1] 高超 张震 陈宗元 郭治军 吴王锁[1,2] JIN Qiang;YANG Junwei;GAO Chao;ZHANG Zhen;CHEN Zongyuan;GUO Zhijun;WU Wangsuo(Radiochemistry Laboratory,School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Key Laboratory of Special Function Materials and Structure Design,Ministry of Education,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]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 [2]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

出　　处：《原子能科学技术》2019年第10期1788-1796,共9页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(21806064,U1730245);兰州大学中央高校基本科研业务费专项资助(lzujbky-2018-20,lzujbky-2018-kb06);甘肃省青年科技基金计划资助项目(17JR5RA195)

摘　　要：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。The adsorption of Cs(Ⅰ) on Taohuajiang sediments was studied as a function of contact time,solid-liquid ratio,pH,ionic strength,temperature,Cs(Ⅰ) concentration and mineral composition.It is found that Cs(Ⅰ) adsorption is sensitive to ionic strength and the content of clayey components in sediment,whereas it is insensitive to pH and temperature,indicating that Cs(Ⅰ) adsorption mechanism is cation exchange on clayey components.The desorption rate of Cs(Ⅰ) on Taohuajiang sediments is obviously lower than the adsorption rate.In the framework of the frayed edge-planar site conceptual model available in the literature,a new adsorption model was constructed to interpret quantitatively the adsorption of Cs(Ⅰ) on Taohuajiang sediments.The study results are useful to accurately predict the adsorption of Cs(Ⅰ) on the Taohuajing sediments,and provide basic data and reference model for the assessment of water quality around Taohuajiang Nuclear Power Plant,the establishment of wastewater discharge standards and the emergency treatment of nuclear accidents.

关 键 词：Cs(Ⅰ) 桃花江核电厂 桃花江水底沉积物 吸附 建模 

分 类 号：O647.32[理学—物理化学]