Page 24 - 《精细化工》2020年第2期
P. 24
第 38 卷第 2 期 精 细 化 工 Vol.38, No.2
202 1 年 2 月 FINE CHEMICALS Feb. 2021
综论
层状双氢氧化物材料在染料废水中的应用进展
*
李 聪,杨 斌,杨金辉 ,王劲松,周书葵,雷增江
(南华大学 土木工程学院,湖南 衡阳 421001)
摘要:层状双氢氧化物(LDH)凭借其特殊的层状结构、极强的可调控性等,已在水处理领域得到广泛关注。
LDH 除用于重金属吸附外,处理染料废水也表现出独特的优势。但由于单一的 LDH 存在耐酸碱性差、表面官
能团少、化学稳定性差等缺陷,严重制约了其在处理染料废水方面的应用,为此,越来越多的研究者通过对 LDH
进行改性提高材料的吸附性能。首先归纳总结了 LDH 材料的常用制备及改性方法并比较了各方法的优缺点;其
次,介绍了改性 LDH 材料对染料废水中离子的去除效果及其吸附机理,同时分析了不同环境条件(pH、接触
时间、吸附剂用量等)对 LDH 基吸附材料吸附性能的影响;最后,对改性 LDH 材料的应用现状作出总结并对
其未来发展方向作出展望。
关键词:层状双氢氧化物;改性;染料废水;吸附机理;吸附性能
中图分类号:X703 文献标识码:A 文章编号:1003-5214 (2021) 02-0226-08
Progress of the application of layered double hydroxide
materials in dye wastewater
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LI Cong, YANG Bin, YANG Jinhui , WANG Jinsong, ZHOU Shukui, LEI Zengjiang
(School of Civil Engineering, University of South China, Hengyang 421001, Hunan, China)
Abstract: Layered double hydroxide (LDH) has attracted much attention in the field of water treatment
because of its special layered structure and highly controllable performance. In addition to being used for
heavy metal adsorption, LDH also shows unique advantages in treating dye wastewater. However, the single
LDH has defects such as poor acid-base resistance, few surface functional groups and poor chemical
stability, which restrict its application in dye wastewater treatment. So, more and more researchers improve
the adsorption properties of materials by modification of LDH. Firstly, the preparation and modification
methods of LDH materials are introduced and their advantages and disadvantages are compared. Secondly,
the removal effect and adsorption mechanism of ions in dye wastewater by modified LDH materials are
introduced, at the same time, the influences of different environmental conditions (pH, contact time, amount
of adsorbent, etc.) on the adsorption performance of LDH-based adsorbing materials are analyzed. Finally,
the application status of modified LDH materials is summarized, and its future development is prospected.
Key words: layered double hydroxide; modification; dye wastewater; adsorption mechanism; adsorption
performance
随着工业化进程的不断推进,环境治理成为亟 对染料废水中阴、阳离子的处理非常重要。
待解决的问题,纺织、印刷、橡胶、化工、制药、 层状双氢氧化物(LDH)是一种典型的阴离子
2+
3+
食品等行业排放的废水中含有大量的有机染料 [1-3] , 型 黏土材料 ,其表示 形式为 [M 1–x M x (OH) 2 ] x+
n – x+
并且大多数有机阳离子和阴离子染料是高度稳定 [A x/n ] •mH 2 O(其中,M 为金属阳离子;A 为层间
2–
–
–
的,不易于生物降解。若未经处理即排放会对人类 阴离子,通常为 NO 3 、CO 3 、Cl 等),是由二价和
的健康、动植物及水体安全造成极大危害。因此, 三价无机金属阳离子和羟基通过共价结合的方式形
收稿日期:2020-06-24; 定用日期:2020-09-15; DOI: 10.13550/j.jxhg.20200553
基金项目:国家自然科学基金项目(21177053,51174117);湖南省重点学科-土木工程资助项目(0212-002300001)
作者简介: 李 聪(1995—),女,硕士生,E-mail:1549144606@qq.com。联系人:杨金辉(1964—),女,教授,E-mail:yangjinhui126@126.com。