Crosslinking acrylamide with EDTA-intercalated layered double hydroxide for enhanced recovery of Cr(Ⅵ)and Congo red:Adsorptive and mechanistic study  

作　　者：Jing Li Haiqin Yu Xue Zhang Rixin Zhu Liangguo Yan 

机构地区：[1]School of Water Conservancy and Environment,University of Jinan,Jinan 250022,China

出　　处：《Frontiers of Environmental Science & Engineering》2020年第3期189-201,共13页环境科学与工程前沿（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.21577048).

摘　　要：We prepared ethylenediaminetetraacetic acid(EDTA)-intercalated MgAl-layered double hydroxide(LDH-EDTA),then grafted acrylamide(AM)to the LDH-EDTA by a cross-linking method to yield a LDH-EDTA-AM composite;we then evaluated its adsorptive ability for Congo red(CR)and hexavalent chromium(Cr(Ⅵ))in single and binaiy adsorption systems.The adsorption process on LDH-EDTA-AM for CR and Cr(Ⅵ)achieved equilibrium quickly,and the removal efficiencies were minimally affected by initial pH.The maximum uptake quantities of CR and Cr(Ⅵ)on LDH-EDTAAM were 632.9 and 48.47 mg/g,respectively.In mixed systems,chromate removal was stimulated by the presence of CR,while the adsorption efficiency of C R was almost not influenced by coexisting Cr(Ⅵ).The mechanisms involved electrostatic attraction,surface complexation,and anion exchange for the adsorption of both hazardous pollutants.In the Cr(Ⅵ)adsorption process,reduction also took place.The removal efficiencies in real contaminated water were all higher than those in the laboratory solutions.

关 键 词：CHROMATE Dye adsorption Simultaneous removal Cross-linking method Amino functionalization 

分 类 号：X703[环境科学与工程—环境工程]