All-solid-state Z-scheme photocatalysts,containing Cu2O,TiO2(rutile),and Au as the elec-tron mediator,were prepared and applied to the reduction of Cr(Ⅵ)in aqueous solutions.The Cu2O-Au-TiO2 composites were prepared by loading Au core-Cu2O shell hemisphere particles on TiO2(rutile)nanorods using a two-step photocatalytic deposition process.Un-der ultraviolet-visible(UV-vis)light illumination,the Cu2O-Au-TiO2 composites exhibited higher photocatalytic Cr(Ⅵ)reduction activities than those exhibited by single TiO2(rutile)and Cu2O.In this reaction,a precipitate containing Cr,which was considered to be Cr(OH)3,was deposited site-selectively on the Au core-Cu2O shell particles of the composites,indi-cating that the reduction site of the composite was Cu2O,and the reaction proceeded accord-ing to the Z-scheme.The Cu2O-Au-TiO2 composites also exhibited photocatalytic activity under visible light illumination.The oxidation state of Cu in the Cu2O-Au-TiO2 composite gradually changed from Cu(Ⅰ)to Cu(Ⅱ)during the photocatalytic Cr(Ⅵ)reduction.However the composite maintained its high photocatalytic performance even after oxidation.The role of Au in the Cu2O-Au-TiO2 composite was examined by comparing the properties of the Cu2O-Au-TiO2 composite with those of the Cu2O-TiO2 composite prepared via direct Cu2O deposition on TiO2.

Sayaka Yanagida;Takumi Yajima;Takahiro Takei;Nobuhiro Kumada

Centerfor Crystal Science and Technology,University of Yamanashi,Kofu 400-8511,Japan;Advanced Materials Development Sector,Tokyo Metropolitan Industrial Technology Research Institute,2-4-10,Aomi,Koto-ku,Tokyo 135-0064,Japan

环境科学学报（英文版）

[1]Sayaka Yanagida;Takumi Yajima;Takahiro Takei;Nobuhiro Kumada-.Removal of hexavalent chromium from water by Z-scheme photocatalysis using TiO2(rutile)nanorods loaded with Au core-Cu20 shell particles)[J].环境科学学报（英文版）,2022(05):173-189

Removal,hexavalent,chromium,from,water,by,scheme,photocatalysis,using,TiO2,rutile,nanorods,loaded,Au,core,Cu20,shell,particles,All,solid,state,photocatalysts,containing,Cu2O,tron,mediator,were,prepared,applied,reduction,aqueous,solutions,composites,loading,hemisphere,two,step,photocatalytic,deposition,process,Un,ultraviolet,visible,UV,light,illumination,exhibited,higher,activities,than,those,single,In,this,reaction,precipitate,which,was,considered,be,deposited,selectively,indi,cating,that,proceeded,accord,also,activity,under,oxidation,gradually,changed,during,However,maintained,its,performance,even,after,role,examined,comparing,properties,via,direct

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