工业水处理 ›› 2025, Vol. 45 ›› Issue (5): 127-134. doi: 10.19965/j.cnki.iwt.2024-0403

• 试验研究 • 上一篇    

层状双金属氢氧化物MgAl-LDO-L-Cys对水中Hg(Ⅱ)的去除

徐胡娟1(), 马楫2, 林振锋3, 盛铭军4, 朱国营2, 王红专3, 王晓梁4, 郭永福1()   

  1. 1. 苏州科技大学环境科学与工程学院,江苏 苏州 215009
    2. 江苏苏净集团有限公司,江苏 苏州 215122
    3. 苏州苏净环保新材料有限公司,江苏 苏州 215200
    4. 苏州市供排水管理处,江苏 苏州 215004
  • 收稿日期:2024-07-17 出版日期:2025-05-20 发布日期:2025-05-22
  • 通讯作者: 郭永福
  • 作者简介:

    徐胡娟(1997— ),硕士,E-mail:

  • 基金资助:
    苏州市科技局社会发展项目(2023SS02)

Highly efficient removal of Hg(Ⅱ) from water by layered bimetallic hydroxide MgAl-LDO-L-Cys

Hujuan XU1(), Ji MA2, Zhenfeng LIN3, Mingjun SHENG4, Guoying ZHU2, Hongzhuan WANG3, Xiaoliang WANG4, Yongfu GUO1()   

  1. 1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
    2. Jiangsu Sujing Group Co. , Ltd. , Suzhou 215122, China
    3. Suzhou Sujing Environmental Protection New Materials Co. , Ltd. , Suzhou 215200, China
    4. Suzhou Water Supply and Drainage Management Office, Suzhou 215004, China
  • Received:2024-07-17 Online:2025-05-20 Published:2025-05-22
  • Contact: Yongfu GUO

摘要:

为提高层状双金属氢氧化物(MgAl-LDH)对水中Hg(Ⅱ)的吸附效果,利用水热法合成了MgAl-LDO-L-Cys复合吸附剂。利用SEM、FTIR、XPS、Zeta电位等对复合吸附剂进行了表征,并探讨了其对水溶液中Hg(Ⅱ)的吸附效果。结果表明,煅烧后的层状双金属氢氧化物(MgAl-LDO)被L-半胱氨酸(L-Cys)包裹,L-Cys分子通过与MgAl-LDO表面氧化物基团或金属离子形成配位键实现稳定插层。MgAl-LDO-L-Cys对Hg(Ⅱ)的吸附行为遵循Langmuir吸附等温模型和准二级反应动力学模型,在25 ℃下Hg(Ⅱ)的理论最大吸附量为397.92 mg/g,且该吸附过程是一个自发的吸热过程。MgAl-LDO-L-Cys在10次循环使用后,对Hg(Ⅱ)的吸附量依然可达到初始吸附量的71.9%,且在其他离子的存在下,MgAl-LDO-L-Cys对Hg(Ⅱ)依然具有较好的去除效果。MgAl-LDO-L-Cys主要通过巯基、羟基、氨基和羧基等基团与Hg(Ⅱ)发生络合作用去除水中的Hg(Ⅱ)。

关键词: 层状双金属氢氧化物, L-半胱氨酸, Hg(Ⅱ), 吸附

Abstract:

To improve the adsorption effect of layered bimetallic hydroxide(MgAl-LDH) towards Hg(Ⅱ) in water, hydrothermal method was used to synthesize the MgAl-LDO-L-Cys composite adsorbent. The composite adsorbent was characterized by SEM, FTIR, XPS, and Zeta potential determination. The adsorption of Hg(Ⅱ) from aqueous solution by the composite adsorbent was investigated. The results indicated that the calcined layered bimetallic hydroxide (MgAl-LDO) was encapsulated by L-cysteine(L-Cys), and L-Cys molecules achieved stable intercalation by forming coordination bonds with oxide groups or metal ions on the surface of MgAl-LDO. The adsorption behavior of MgAl-LDO-L-Cys towards Hg(Ⅱ) followed the Langmuir adsorption isotherm model and pseudo-second-order reaction kinetic model. The theoretical optimal adsorption capacity of Hg(Ⅱ) at 25 ℃ was 397.92 mg/g, and the adsorption process was a spontaneous endothermic process. After 10 cycles of use, MgAl-LDO-L-Cys still achieved an adsorption capacity of 71.9% of the initial adsorption capacity for Hg(Ⅱ), and it still had a good removal effect on Hg (Ⅱ) in the presence of other ions. The MgAl-LDO-L-Cys mainly removed Hg(Ⅱ) from water by chelating with Hg(Ⅱ) through thiol, hydroxyl, amino, and carboxyl groups.

Key words: layered bimetallic hydroxide, L-cysteine, Hg(Ⅱ), adsorption

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