Amorphous molybdenum sulfide mediated EDTA with multiple active sites to boost heavy metal ions removal  

作　　者：Qi Huang Yizhong Zhang Wei Zhou Xiang Huang Yiliang Chena Xin Tan Tao Yu 

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China [2]School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China [3]School of Science,Tibet University,Lhasa 850000,China [4]School of Science,Tianjin University,Tianjin 300350,China [5]Research Center of Environmental Pollution Control Engineering Technology,Chinese Research Academy of Environmental Sciences,Beijing 100012,China

出　　处：《Chinese Chemical Letters》2021年第9期2797-2802,共6页中国化学快报（英文版）

基　　金：supported by the Natural Science Foundation of Tianjin(No.18JCYBJC17700);the National Natural Science Foundation of China(Nos.21406164,21466035 and 22066022);the National Key Basic Research and Development Program of China(973 Program,No.2014CB239300)。

摘　　要：The rational design of strong affinity adsorbents for heavy metal ions removal remains a critical challenge for water treatment.In this study,amorphous molybdenum sulfide composites(EDTA-MoSx(x=2,3))were fabricated via a facile hydrothermal method mediated by EDTA,which was applied to heavy metal ions(Cu^(2+),Cd^(2+),Pb^(2+),Zn^(2+)and Ni^(2+))removal from aqueous solutions.A case study for Cu^(2+)ions showed that the adsorption capacity of EDTA-MoSx(x=2,3)was superior to crystalline phase MoS2 at pH 6.0 with an initial concentration of 200 mg/L.Adsorption mechanisms of different sulfide groups and—COOH of EDTA-MoSx(x=2,3)were verified systematically via a series of experiments,characterizations,and density functional theory(DFT)calculations.Both bridging S_(2)^(2-)and—COOH covalently bonded with Cu^(2+)ions were ascribed to the critical factors for this enhanced removal efficiency on the surface of EDTA-MoSx(x=2,3).This work offers a new method to enhance the adsorption performance of molybdenum sulfide-based materials by controlling crystallinity mediated with an organic complex small molecule.

关 键 词：Amorphous phase MoS_(2) MoS_(3) Adsorption Heavy metal ions DFT calculations 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]