无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2025, Vol. 57 ›› Issue (8): 48-57.doi: 10.19964/j.issn.1006-4990.2024-0631

• 研究与开发 • 上一篇    下一篇

十二烷基硫酸钠改性镁铝水滑石及对Pb2+的吸附性能研究

韩星1(), 史丹丹2, 王兴权2, 张天应1, 曹悦1, 王怡莹1, 朱祥1, 许乃才1,3()   

  1. 1.青海师范大学化学化工学院,青海 西宁 810016
    2.青海理工学院生态与环境科学学院,青海 西宁 810016
    3.青海省环境功能材料先进技术与应用重点实验室,青海 西宁 810016
  • 收稿日期:2024-11-25 出版日期:2025-08-10 发布日期:2025-07-17
  • 通讯作者: 许乃才(1984— ),男,博士,教授,研究方向为无机材料化学;E-mail:xunc@qhnu.edu.cn
  • 作者简介:韩星(2001— ),男,硕士,研究方向为盐湖镁资源开发利用;E-mail:hx12170222@163.com
  • 基金资助:
    青海省重点研发与转化计划项目(2023-HZ-811);青海省“昆仑英才?科技领军人才”项目

Study on Mg-Al hydrotalcite modified by sodium dodecyl sulfate and its adsorption performance for Pb2+

HAN Xing1(), SHI Dandan2, WANG Xingquan2, ZHANG Tianying1, CAO Yue1, WANG Yiying1, ZHU Xiang1, XU Naicai1,3()   

  1. 1.School of Chemistry and Chemical Engineering,Qinghai Normal University,Xining 810016,China
    2.School of Ecology and Environmental Sciences,Qinghai Institute of Technology,Xining 810016,China
    3.Key Laboratory of Advanced Technology and Application of Environmental Functional Materials in Qinghai Province,Xining 810016,China
  • Received:2024-11-25 Published:2025-08-10 Online:2025-07-17

摘要:

以盐湖提钾副产物水氯镁石为镁源,六水氯化铝为铝源,采用共沉淀法制备了镁铝水滑石(MgAl-LDH),将其高温焙烧后得到层状双金属氧化物(LDO),采用水化重构法制得十二烷基硫酸钠改性的镁铝水滑石(S-MgAl-LDH)。用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、N2吸脱附手段对材料的微观结构进行表征。以MgAl-LDH和S-MgAl-LDH为吸附剂,研究溶液pH、时间、温度和初始浓度等对溶液中Pb2+的吸附性能影响。结果表明:十二烷基硫酸钠改性的镁铝水滑石对Pb2+的吸附性能显著提升,328 K时S-MgAl-LDH对Pb2+的最大吸附容量为220.85 mg/g,吸附参数符合准二级动力学和Langmuir模型,吸附过程为单层吸附并受化学作用控制;吸附反应的Hɵ为正值,Gɵ为负值,表明吸附过程自发且吸热;吸附机理主要包括表面络合、层间螯合、沉淀及同晶置换。研究结果为提钾副产物水氯镁石的开发和高值化利用开拓了新途径,并展现出S-MgAl-LDH在重金属离子污染方面的应用潜力。

关键词: 十二烷基硫酸钠改性, 水氯镁石, 镁铝水滑石, 吸附, Pb2+

Abstract:

Magnesium-aluminum hydrotalcite(MgAl-LDH) was prepared by coprecipitation method using hydrochlorite as magnesium source and aluminum chloride hexahydrate as aluminum source.The layered bimetallic oxide(LDO) was obtained after roasting at high temperature.Sodium dodecyl sulfate(SDS) modified Mg-Al hydrotalcite(S-MgAl-LDH) was prepared by hydration reconstruction method.The microstructure of the materials was characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM) and N2 adsorption and desorption.The adsorption properties of Pb2+ onto MgAl LDH and S-MgAl-LDH were studied with pH,time,temperature and initial concentration of the solution.The results showed that the adsorption performance of Mg-Al hydrotalc for Pb2+ was significantly improved after SDS modification.The maximum adsorption capacity of S-MgAl-LDH for Pb2+ at 328 K was 220.85 mg/g,and the adsorption parameters were consistent with the pseudo-second-order kinetics and Langmuir model,indicating that the adsorption process was single-layer adsorption and controlled by chemical action.The positive values of Hɵ and negative values of Gɵ indicated that the adsorption process was spontaneous and endothermic.The adsorption mechanism mainly included surface complexation,interlayer chelation,precipitation,and isomorphic substitution.This study opened up a new way for the development and high-value utilization of hydrochloromagnite,a by-product of potassium extraction,and showed the application potential of S-MgAl-LDH in heavy metal ion pollution.

Key words: SDS modification, bischofite, hydrotalcite, adsorption, Pb2+

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