工业水处理 ›› 2023, Vol. 43 ›› Issue (1): 95-101. doi: 10.19965/j.cnki.iwt.2022-0223

• 试验研究 • 上一篇    下一篇

L-半胱氨酸和聚吡咯功能化磁性高岭土对水中Hg2+的吸附

许砚铭1(),张书园1,曹红杰2,郭永福1,3()   

  1. 1.苏州科技大学市政工程系, 江苏 苏州 215011
    2.江苏若焱环境设计有限公司, 江苏 苏州 215000
    3.江苏省水处理材料技术与材料协同创新中心, 江苏 苏州 215009
  • 收稿日期:2022-11-16 出版日期:2023-01-20 发布日期:2023-01-16
  • 通讯作者: 郭永福 E-mail:1484506144@qq.com;yongfuguo@163.com
  • 作者简介:许砚铭(1996— ),硕士。电话:15861559220,E-mail:1484506144@qq.com|郭永福,教授。E-mail:yongfuguo@163.com
  • 基金资助:
    张家港市科技局产学研预研资金项目(ZKCXY2113)

Adsorption of Hg2+ with L-cysteine and polypyrrole functionalized magnetic kaolin

Yanming XU1(),Shuyuan ZHANG1,Hongjie CAO2,Yongfu GUO1,3()   

  1. 1.Department of Municipal Engineering, Suzhou University of Science and Technology, Suzhou 215011, China
    2.Jiangsu Ruoyan Environmental Design Co. , Ltd. , Suzhou 215000, China
    3.Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009, China
  • Received:2022-11-16 Online:2023-01-20 Published:2023-01-16
  • Contact: Yongfu GUO E-mail:1484506144@qq.com;yongfuguo@163.com

摘要:

为提高高岭土对水中Hg2+的吸附能力并改善其团聚性能,采用一种安全、高效、绿色的方法合成了L-半胱氨酸和聚吡咯双功能化的磁性高岭土(m@Kaolin-LC/Ppy)。通过扫描电镜、傅里叶红外、X射线衍射仪、比表面积分析仪和磁强计等对吸附剂进行表征,分析了m@Kaolin-LC/Ppy合成前后的各项参数,同时研究了不同pH和反应温度下对水中Hg2+的去除情况。结果表明:m@Kaolin-LC/Ppy在pH=7和投加量为0.05 g/L的条件下取得最佳吸附量372.5 mg/g,对Hg2+的去除过程符合准二级动力学和Langmuir等温吸附,并以化学吸附为主。m@Kaolin-LC/Ppy具有较好的重复使用性、良好的分散能力和化学稳定性,吸附后易于从水中分离出来。

关键词: 磁性高岭土, L-半胱氨酸, 聚吡咯, 汞离子, 吸附

Abstract:

To improve the adsorption capacity and agglomeration properties of kaolin to Hg2+ in water,L-Cysteine and polypyrrole bi-functionalized magnetic kaolin(m@Kaolin-LC/Ppy) was synthesized by a safe,effective and green method. The adsorbent was characterized by scanning electron microscopy,Fourier infrared,X-ray diffractometer,specific surface area analyzer and magnetometer,and the parameters before and after the synthesis of m@Kaolin-LC/Ppy were analyzed and studied. The removal of Hg2+ from water was investigated under the conditions of various pH values and temperatures. The results showed that the optimal adsorption capacity of 372.5 mg/g is obtained for the m@Kaolin-LC/Ppy at pH=7 and a dosage of 0.05 g/L. The adsorption process of Hg2+ can be characterized by the Pseudo-second-order kinetics and Langmuir isotherm models,and is mainly attributed to chemisorption. The m@Kaolin-LC/Ppy has good reusability,dispersibility and chemical stability,and is easily separated from aqueous solution after adsorption.

Key words: magnetic kaolin, L-Cysteine, polypyrrole, mercury ion, adsorption

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