Defects-rich MgFe LDH:A high-capacity adsorbent for methyl orange wastewater  

作　　者：Chunmei Zhu Liting Zhang Chenyuan Cui Xin Lian Long Qu Bai He Guoyuan Yuan Jian Feng Siwei Xiang Bo Yu 

机构地区：[1]School of Chemistry and Chemical Engineering,Chongqing University of Science and Technology,Chongqing 401331,China [2]Research Center of Smart Environmental Analysis,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第10期63-73,共11页中国化学工程学报（英文版）

基　　金：the National Natural Science Foundation of China(21908012);the Natural Science Foundation of Chongqing,China(cstc2020jcyj-msxmX0875 and CSTB2022BSXM-JSX0021);Chongqing Postdoctoral Research Project Special Funding(2023CQBSHTB3110);Postgraduate Research and Innovation Project of Chongqing University of Science and Technology(YKJCX2220541);Major Enterprise Demand Projects with Open Bidding for Selecting the Best Candidates in Yichun City,China(2023JBGSXM05)for the financial support to this work.

摘　　要：Dye pollution is a common pollutant in wastewater that poses a serious threat to human health.Layered double hydroxide(LDH)is a commonly used adsorbent for dye removal.However,its adsorption efficiency is significantly limited by the limited adsorption active sites of the adsorbent.In this paper,a defects-rich MgFe LDH adsorbent for anionic dye wastewater was synthesized by a simple hydrothermal method and alkaline etching.Different analytical techniques,such as XRD,FT-IR,SEM,TEM,XPS,and N2 adsorption-desorption isotherm,were used to verify the chemical composition and surface characteristics of the materials,and the effects of pH,temperature,and contact time on the adsorption effect of methyl orange and the adsorption mechanism were analyzed.Alkaline etching of Al and Zn in the laminate generated defects that expose unsaturated coordination centers and create abundant adsorption sites,which can electrostatically attract and coordinate with dye ions.At 25℃,the adsorption capacity of MgFe LDH with Al etched and MgFe LDH with Zn etched for methyl orange dye reached 1722 mg·g^(-1 ) and 1685 mg·g^(-1 ),respectively,much higher than that of MgFe LDH(544 mg·g^(-1 )).This work provides a promising method for the removal of dye wastewater by adsorption and a new idea for the design and development of high-performance dye wastewater adsorbents.

关 键 词：MgFe LDH Methyl orange Alkaline etching Defects Adsorption 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]