首页|Selective removal of Cr(Ⅵ)using polyvinylpyrrolidone and polyacrylamide co-modified MoS2 composites by adsorption combined with reduction

Selective removal of Cr(Ⅵ)using polyvinylpyrrolidone and polyacrylamide co-modified MoS2 composites by adsorption combined with reduction

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Cr(Ⅵ),one of the most hazardous metal pollutants,poses significant threats to the environment and hu-man health.Herein,a novel MoS2 composite(MoS2/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 MoS2,and introduce pyrrolic N and amino functional groups.The batch exper-iments showed that MoS2/PVP/PAM represented excellent Cr(Ⅵ)removal performance over a wide pH range,and exhibited a significantly higher maximum Cr(Ⅵ)adsorption capacity(274.73 mg/g,at pH 3.0,and 298K)than pure MoS2.The adsorption of Cr(Ⅵ)followed Langmuir and pseudo-second-order kinetic model,which was a homogeneous monolayer chemisorption process.MoS2/PVP/PAM showed stable re-moval of Cr(Ⅵ)in the presence of humic acid(HA),interfering cations and anions at different concentra-tions.Moreover,it had excellent selectivity for Cr(Ⅵ)(Kd value of 1.69 × 107 mL/g)when coexisting with a variety of competing ions.Multiple characterization revealed that Cr(Ⅵ)was reduced to low toxicity Cr(Ⅲ)by Mo4+and S2-,and then chelated on the surface of the adsorbent by pyrrolic N.This research expanded the design concept for MoS2 composites by demonstrating the potential of MoS2/PVP/PAM as a promising material for selective elimination of Cr(Ⅵ)in water.

PolyvinylpyrrolidonePolyacrylamideMoS2Cr(Ⅵ)removalAdsorbentReduction

Shuqi Yu、Yu Yang、Keisuke Kuroda、Jian Pu、Rui Guo、Li-An Hou

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State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,China

Department of Environmental and Civil Engineering,Toyama Prefectural University,Imizu,Toyama 939-0398,Japan

Institute for the Advanced Study of Sustainability,United Nations University,Jingumae 5-53-70,Shibuya-ku,Tokyo 150-8925,Japan

Technical Centre for Soil,Agriculture and Rural Ecology and Environment,Ministry of Ecology and Environment,Beijing 100012,China

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National Natural Science Foundation of ChinaNational Key Research and Development Program of China

519201050122021YFC3201403

2024

10.1016/j.cclet.2023.109130

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(6)
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