Selective removal of Cr(Ⅵ)using polyvinylpyrrolidone and polyacrylamide co-modified MoS_(2) ccomposites by adsorption combined with reduction  

作　　者：Shuqi Yu Yu Yang Keisuke Kuroda Jian Pu Rui Guo Li-An Hou 

机构地区：[1]State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,China [2]Department of Environmental and Civil Engineering,Toyama Prefectural University,Imizu,Toyama 939-0398,Japan [3]Institute for the Advanced Study of Sustainability,United Nations University,Jingumae 5-53-70,Shibuya-ku,Tokyo 150-8925,Japan [4]Technical Centre for Soil,Agriculture and Rural Ecology and Environment,Ministry of Ecology and Environment,Beijing 100012,China

出　　处：《Chinese Chemical Letters》2024年第6期524-530,共7页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51920105012);the National Key Research and Development Program of China(No.2021YFC3201403)。

摘　　要：Cr(Ⅵ),one of the most hazardous metal pollutants,poses significant threats to the environment and human health.Herein,a novel MoS_(2) composite(MoS_(2)/PVP/PAM)modified by polyvinylpyrrolidone(PVP)and polyacrylamide(PAM)was synthesized to enhance the removal of Cr(Ⅵ).Characterization analysis including SEM,XRD,FTIR,and XPS indicated that PVP and PAM could increase the interlayer spacing and the dispersibility of MoS_(2),and introduce pyrrolic N and amino functional groups.The batch experiments showed that MoS_(2)/PVP/PAM represented excellent Cr(Ⅵ)removal performance over a wide p H range,and exhibited a significantly higher maximum Cr(Ⅵ)adsorption capacity(274.73 mg/g,at p H 3.0,and 298 K)than pure MoS_(2).The adsorption of Cr(Ⅵ)followed Langmuir and pseudo-second-order kinetic model,which was a homogeneous monolayer chemisorption process.MoS_(2)/PVP/PAM showed stable removal of Cr(Ⅵ)in the presence of humic acid(HA),interfering cations and anions at different concentrations.Moreover,it had excellent selectivity for Cr(Ⅵ)(K_(d) value of 1.69×10^(7)m L/g)when coexisting with a variety of competing ions.Multiple characterization revealed that Cr(Ⅵ)was reduced to low toxicity Cr(Ⅲ)by Mo^(4+)and S^(2-),and then chelated on the surface of the adsorbent by pyrrolic N.This research expanded the design concept for MoS_(2) composites by demonstrating the potential of MoS_(2)/PVP/PAM as a promising material for selective elimination of Cr(Ⅵ)in water.

关 键 词：POLYVINYLPYRROLIDONE POLYACRYLAMIDE MoS_(2) Cr(Ⅵ)removal Adsorbent REDUCTION 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]