ZnO/CeO_(2)/carbon xerogel composites with direct Z-scheme heterojunctions:Enhancing photocatalytic remediation of 4-chlorophenol under visible light  

作　　者：Nicolas Perciani de Moraes Maite Birkett de Campos Sanmartin Robson da Silva Rocha Abner de Siervo Marcos Roberto de Vasconcelos Lanza D.Amaranatha Reddy Lianqing Yu Liana Alvares Rodrigues 

机构地区：[1]Escola de Engenharia de Lorena-EEL/USP,Estrada Municipal do Campinho S/N,CEP 12602-810,Lorena,Sao Paulo,Brazil [2]Institute of Physics"Gleb Wataghin",Applied Physics Department,State University of Campinas,13083-859,Campinas,SP,Brazi [3]Instituto de Quimica de Sao Carlos,Universidade de Sao Paulo,Av.Trab.Sao Carlense,400-Parque Arnold Schimidt,Sao Carlos,SP,13566-590,Spain [4]Department of Sciences,Indian Institute of Information Technology Design and Manufacturing,Kurnool,Andhra Pradesh,518007,India [5]School of Materials Science and Engineering,China University of Petroleum,Qingdao,266580,China

出　　处：《Journal of Rare Earths》2024年第2期314-322,I0003,共10页稀土学报（英文版）

基　　金：Project supported by the Sao Paulo Research Foundation(FAPESP)(2018/10492-1,2018/16360-0,2007/08244-5,2007/54829-5,2017/18574-4,2017/10118-0,2014/50945-4);the Conselho Nacional de Desenvolvimento Cientifico e Tecnológico(CNPq)(465571/2014-0,302874/2017-8,427452/2018-0)。

摘　　要：This paper aims to create visible light driven ternary photocatalysts using zinc oxide(ZnO),cerium(IV)oxide(CeO_(2)),and carbon xerogel(CX) as constituent materials.The use of CeO_(2) is based on the creation of direct-Z-scheme heterojunctions with the ZnO and the consequent diminishing of charge recombination,whereas the carbon xerogel inclusion is predicted to minimize bandgap energy,decrease electro n-hole reco mbination,and boost specific surface area.Furthermo re,the choice of the black-wattle tannin as a carbonaceous precursor was targeted at the development of an environmentally friendly and affordable composite.The existence of the hexagonal phase of zinc oxide and cubic structure of the cerium(IV) oxide in the ternary material was confirmed by X-ray diffractometry and X-ray photoelectron spectroscopy,with the latter also suggesting chemical bonding between the ZnO and the CX due to the creation of zinc oxycarbide complexes.The inclusion of the carbon xerogel provokes a significant modification in the morphology of the ternary material,resulting in an increased surface area and smaller particle aggregates.The CX/ZnO-CeO_(2) ternary composite obtains the highest photocatalytic efficiency among all the materials studied,degrading 100% of 4-chlorophenol under simulated sunlight and 68% under visible radiation,after 5 h.The increased photocatalytic activity can be attributed to the formation of direct Z-scheme heterojunctions between the semiconductors,higher visible light response,and higher specific surface area,as evidenced by the results obtained by active radical scavenging,chronoamperometry,diffuse reflectance spectroscopy,and N_(2) adsorption-desorption isotherms.

关 键 词：Zinc oxide Cerium(Ⅳ)oxide Carbon xerogel Photocatalysis Direct Z-scheme heterojunction 4-CHLOROPHENOL Rare earths 

分 类 号：TB33[一般工业技术—材料科学与工程] O643.36[理学—物理化学]