Ag_2S-石墨烯/TiO_2的声化学法合成及可见光催化活性(英文)  

Article Enhanced visible light photocatalytic activity of Ag_2S-graphene/TiO_2 nanocomposites made by sonochemical synthesis

作　　者：Ze‐Da Meng Lei Zhu Kefayat Ullah Shu Ye Qian Sun Won‐Chun Oh 

机构地区：[1]Department of Advanced Materials Science and Engineering,Hanseo University [2]Department of Advanced Materials Science and Engineering,Hanseo University,Chungnam 356-706,Korea

出　　处：《催化学报》2013年第8期1527-1533,共7页

基　　金：supported by Research Foundation from Hanseo University in 2012;the staff at the University for the financial support

摘　　要：Ag2S‐graphene/TiO2 composites were synthesized by a facile sonochemical method.The products were characterized by X‐ray diffraction,scanning electron microscopy,energy dispersive X‐ray spectroscopy,transmission electron microscopy,and UV‐Vis diffuse reflectance spectrophotometry.During the synthesis reaction,the reduction of graphene oxide and loading of Ag2S and TiO2 particles were achieved.The Ag2S‐graphene/TiO2 composites possessed a large adsorption capacity for dyes,an extended light absorption range,and efficient charge separation properties.Hence,in the photodegradation of rhodamine B,a significant enhancement in the reaction rate was observed with the Ag2S‐graphene/TiO2 composites as compared to pure TiO2.The generation of reactive oxygen species was detected by the oxidation of 1,5‐diphenyl carbazide to 1,5‐diphenyl carbazone.The high activity was attributed to the synergetic effects of high charge mobility and the red shift in the absorption edge of the Ag2S‐graphene/TiO2 composites.Ag2S‐graphene/TiO2 composites were synthesized by a facile sonochemical method.The products were characterized by X‐ray diffraction,scanning electron microscopy,energy dispersive X‐ray spectroscopy,transmission electron microscopy,and UV‐Vis diffuse reflectance spectrophotometry.During the synthesis reaction,the reduction of graphene oxide and loading of Ag2S and TiO2 particles were achieved.The Ag2S‐graphene/TiO 2 composites possessed a large adsorption capacity for dyes,an extended light absorption range,and efficient charge separation properties.Hence,in the photodegradation of rhodamine B,a significant enhancement in the reaction rate was observed with the Ag2S‐graphene/TiO2 composites as compared to pure TiO2.The generation of reactive oxygen species was detected by the oxidation of 1,5‐diphenyl carbazide to 1,5‐diphenyl carbazone.The high activity was attributed to the synergetic effects of high charge mobility and the red shift in the absorption edge of the Ag2S‐graphene/TiO2 composites.

关 键 词：纳米复合材料 超声合成 扫描电子显微镜 透射电子显微镜 二苯卡巴肼 二氧化钛粒子 射线衍射 氧化石墨 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O643.3[理学—物理化学]