Fast and efficient aqueous arsenic removal by functionalized MIL-100(Fe)/rGO/δ-MnO2 ternary composites:Adsorption performance and mechanism  

作　　者：Sittipranee Ploychompoo Jingda Chen Hanjin Luo Qianwei Liang 

机构地区：[1]School of Environment and Energy,South China University of Technology,Guangzhou 510006,China [2]The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education,Guangzhou 510006,China [3]Guangdong Engineering and Technology Research Center for Environmental Nanomaterials,Guangzhou 510006,China

出　　处：《Journal of Environmental Sciences》2020年第5期22-34,共13页环境科学学报（英文版）

基　　金：supported by the Social Development Fund of Guangdong Province(No.2017A020216018);the Guangzhou Science and Technology Project(No.201904010319)

摘　　要：Because of its significant toxicological effects on the environment and human health,arsenic(As)is a major global issue.In this study,an Fe-based metal-organic framework(MOF)(Materials of Institut Lavoisier:MIL-100(Fe))which was impregnated with reduced graphene oxide(rGO)by using a simple hydrothermal method and coated with birnessitetype manganese oxide(δ-MnO2)using the one-pot reaction process(MIL-100(Fe)/rGO/δ-MnO2 nanocomposites)was synthesized and applied successfully in As removal.The removal efficiency was rapid,the equilibrium was achieved in 40 min and 120 min for As(Ⅲ)and As(Ⅴ),respectively,at a level of 5 mg/L.The maximum adsorption capacities of As(Ⅲ)and As(Ⅴ)at pH 2 were 192.67 mg/g and 162.07 mg/g,respectively.The adsorbent revealed high stability in pH range 2-9 and saturated adsorbent can be fully regenerated at least five runs.The adsorption process can be described by the pseudo-second-order kinetic model and Langmuir monolayer adsorption.The adsorption mechanisms consisted of electrostatic interaction,oxidation and inner sphere surface complexation.

关 键 词：MIL-100(Fe) Δ-MNO2 Reduced graphene oxide ARSENIC ADSORPTION 

分 类 号：TU991.2[建筑科学—市政工程]