双功能Cu-TiO_(2)/CuO光催化剂用于大规模协同处理含有机污染物和重金属离子的废水  

Bi-functional Cu-TiO_(2)/CuO photocatalyst for large-scale synergistic treatment of waste sewage containing organics and heavy metal ions

作　　者：丁杨 Soumyajit Maitra 王春花 郑润田 Tarek Barakat Subhasis Roy 陈丽华 苏宝连 Yang Ding;Soumyajit Maitra;Chunhua Wang;Runtian Zheng;Tarek Barakat;Subhasis Roy;Li-Hua Chen;Bao-Lian Su(Laboratory of Inorganic Materials Chemistry(CMI),University of Namur,61 rue de Bruxelles,B-5000,Namur,Belgium;Namur Institute of Structured Matter(NISM),University of Namur,61 rue de Bruxelles,B-5000,Namur,Belgium;Department of Chemical Engineering,University of Calcutta,92,APC Road,Kolkata,West Bengal 700009,India;Department of Chemistry,KU Leuven,Celestijnenlaan 200F,B-3001 Leuven,Belgium;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Clare Hall,University of Cambridge,United Kingdom,CB21EW,UK)

机构地区：[1]Laboratory of Inorganic Materials Chemistry(CMI),University of Namur,61 rue de Bruxelles,B-5000,Namur,Belgium [2]Namur Institute of Structured Matter(NISM),University of Namur,61 rue de Bruxelles,B-5000,Namur,Belgium [3]Department of Chemical Engineering,University of Calcutta,92,APC Road,Kolkata,West Bengal 700009,India [4]Department of Chemistry,KU Leuven,Celestijnenlaan 200F,B-3001 Leuven,Belgium [5]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China [6]Clare Hall,University of Cambridge,United Kingdom,CB21EW,UK

出　　处：《Science China Materials》2023年第1期179-192,共14页中国科学（材料科学（英文版）

基　　金：the financial support from the China Scholarship Council(201808310127);Hubei Provincial Department of Education for the“Chutian Scholar”program;financially supported by the Foundation of Natural Science(61905159);the National Natural Science Foundation of China(U1663225)Program for Changjiang Scholars and Innovative Research Team(IRT_15R52);the project“Depollut Air”of Interreg V France-Wallonie-Vlaanderen。

摘　　要：大多数所制备的光催化剂通常只用于单一地降解有机污染物或还原Cr(VI)的光催化.然而,无机和有机污染物通常共存于工业污水中.同时消除混合的无机和有机污染物仍然存在着巨大的挑战.在本文中,我们通过原位掺杂和异质结工程策略,制备出了新型的双功能CuTiO_(2)/CuO光催化剂用于大规模高效协同光催化消除废水中的有机污染物和过渡金属离子.具体而言,这种双功能光催化剂在RhB和Cr(VI)共存溶液中的光催化RhB降解率和Cr(VI)还原率分别是在单一RhB或Cr(VI)污染物溶液中对应值的2.35和3.84倍.光催化染料分子降解和Cr(VI)还原之间存在显著增强的协同效应.此外,该双功能光催化剂在大规模光催化消除混合污染物方面也表现出较好的活性和稳定性.理论计算表明,铜掺杂和异质结工程促进了高效的光吸收、增高的载流子密度以及快速的光生载流子转移,从而产生高效的协同光催化作用.这种双功能光催化剂的概念为大规模工业废水处理和净化开辟了新途径.Numerous photocatalysts have been prepared for the photocatalysis of either organic pollutant degradation or Cr(VI)reduction.However,most of the inorganic and organic pollutants usually co-exist in industrial sewage.Simultaneous elimination of mixed inorganic and organic pollutants remains highly challenging.Herein,we report bifunctional Cu-TiO_(2)/CuO photocatalysts by the in-situ doping and heterostructure engineering strategies for large-scale and highly enhanced synergistic photocatalytic elimination of organic pollutants and transitional metallic ions from waste sewage in one shot.Specifically,this bi-functional photocatalyst displays about 2.35 and 3.84 times higher photocatalytic Rhodamine B(RhB)degradation and Cr(VI)reduction rates in the solution with co-existing RhB and Cr(VI)than that in the single RhB or Cr(VI)pollutant solution,respectively.A highly boosted synergetic effect between photocatalytic dye molecule degradation and Cr(VI)reduction is revealed.The bi-functional photocatalyst also displays extraordinary activity and stability in large-scale photocatalytic elimination of mixed pollutants.Moreover,theoretical calculations demonstrate that Cu doping and heterostructure engineering give rise to the narrowed bandgap for enhanced light harvesting,the increased density of states for high charge carrier density,the delocalized electron for fast photoinduced charge carrier separation,and the profitable charge transfer between TiO_(2)and CuO,thus bringing about the efficient synergetic photocatalysis.The bi-functional photocatalyst concept reported in this study opens a new avenue to construct bifunctional photocatalysts for solar-to-fuel conversion and large-scale industrial waste water treatment and river purification.

关 键 词：降解有机污染物 光催化剂 光生载流子 CR(VI) 载流子密度 过渡金属离子 染料分子 铜掺杂 

分 类 号：X703[环境科学与工程—环境工程] TQ426[化学工程]