工业水处理 ›› 2020, Vol. 40 ›› Issue (10): 67-71. doi: 10.11894/iwt.2019-1134

• 试验研究 • 上一篇    下一篇

巯基改性泥炭对水体中Hg2+的吸附解吸研究

姚璁1(),何天容1,*(),冉澍1,王祖波2,王衡3   

  1. 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
  • 收稿日期:2020-07-13 出版日期:2020-10-20 发布日期:2020-10-21
  • 通讯作者: 何天容 E-mail:yaocong9513@163.com;trhe@gzu.edu.cn
  • 作者简介:姚璁(1995-),硕士研究生。E-mail:yaocong9513@163.com
  • 基金资助:
    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)

Adsorption and desorption of Hg2+ in water by thiol group modified peat

Cong Yao1(),Tianrong He1,*(),Shu Ran1,Zubo Wang2,Heng Wang3   

  1. 1. Key Laboratory of Karst Environment and Geohazard Prevention, Guizhou University, Guiyang 550025, China
    2. School of Resources and Environment Engineering, Guizhou University, Guiyang 550025, China
    3. College of Public Administration, Guizhou Finance and Economics University, Guiyang 550025, China
  • Received:2020-07-13 Online:2020-10-20 Published:2020-10-21
  • Contact: Tianrong He E-mail:yaocong9513@163.com;trhe@gzu.edu.cn

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Hg2+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Hg2+的吸附量,且吸附平衡时间明显缩短。巯基改性泥炭土对Hg2+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。

关键词: 泥炭, 巯基, Hg2+, 吸附, 解吸

Abstract:

The peat was modified by 3-mercaptopropyltriethoxysilane. The adsorption dynamics and isometric adsorption and desorption process of the different amounts of -SH modified peat on Hg2+ in the water body were studied, and the adsorption mechanism was explored. The results showed that increasing the -SH content in peat soil increased the adsorption capacity of peat to Hg2+, and the adsorption equilibrium time was obviously shortened. The adsorption of Hg2+ by mercapto-modified peat conformed to the pseudo-second-order dynamic equation and Langmuir adsorption isotherm equation, and the desorption rate after adsorption was low. Its adsorption mechanism was mainly through the complex adsorption on mercury, such as hydroxyl, carbonyl and other functional groups.

Key words: peat, thiol group, Hg2+, adsorption, desorption

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