巯基改性泥炭对水体中Hg^2+的吸附解吸研究  

Adsorption and desorption of Hg^2+ in water by thiol group modified peat

作　　者：姚璁 何天容[1] 冉澍 王祖波 王衡[3] Yao Cong;He Tianrong;Ran Shu;Wang Zubo;Wang Heng(Key Laboratory of Karst Environment and Geohazard Prevention,Guizhou University,Guiyang 550025,China;School of Resources and Environment Engineering,Guizhou University,Guiyang 550025,China;College of Public Administration,Guizhou Finance and Economics University,Guiyang 550025,China)

机构地区：[1]贵州大学喀斯特环境与地质灾害防治重点实验室,贵州贵阳550025 [2]贵州大学资源与环境工程学院,贵州贵阳550025 [3]贵州财经大学公共管理学院,贵州贵阳550025

出　　处：《工业水处理》2020年第10期67-71,共5页Industrial Water Treatment

基　　金：贵州省科技支撑项目([2018]2336);国家自然科学基金项目(41763017);国家自然科学基金-贵州喀斯特联合基金项目(U1612442);贵州省教育厅青年科技人才成长项目([2016]177)。

摘　　要：以泥炭土为原料,利用3-巯丙基三甲氧基硅烷对其进行改性,研究了不同巯基量改性泥炭土对水中Hg^2+的吸附动力学特征及等温吸附解吸过程,并探讨了吸附机理。结果表明:提高泥炭土中的巯基含量,可增大泥炭土对Hg^2+的吸附量,且吸附平衡时间明显缩短。巯基改性泥炭土对Hg^2+的吸附符合准二级动力学方程和Langmuir吸附等温方程,吸附后的解吸率均较低。其吸附机理主要是通过羟基、羰基等官能团对汞的络合吸附作用。The peat was modified by 3-mercaptopropyltriethoxysilane.The adsorption dynamics and isometric adso-rption and desorption process of the different amounts of—SH modified peat on Hg^2+in the water body were studied,and the adsorption mechanism was explored.The results showed that increasing the—SH content in peat soil increa-sed the adsorption capacity of peat to Hg^2+,and the adsorption equilibrium time was obviously shortened.The adsorp-tion of Hg^2+by mercapto-modified peat conformed to the pseudo-second-order dynamic equation and Langmuir adsor-ption isotherm equation,and the desorption rate after adsorption was low.Its adsorption mechanism was mainly thr-ough the complex adsorption on mercury,such as hydroxyl,carbonyl and other functional groups.

关 键 词：泥炭 巯基 HG^2+ 吸附 解吸 

分 类 号：X703[环境科学与工程—环境工程]