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《Journal of Molecular Catalysis》 2014-04
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Preparation of Graphene-BiOBr Composite and the Enhanced Photocatalytic Activity under Visible-light Irradiation

ZHOU Wei;HU Xiao-long;ZHAO Xiao-rong;JIA Man-ke;HUANG Ying-ping;FANG Yan-fen;Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area;Engineering Research Center of Eco-environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University;  
Graphene-bismuth oxybromide( Gre-BiOBr) composites with different amounts of graphene loading on BiOBr were prepared by ultrasound-hydrothermal method,named BiOBr,2% Gre-BiOBr,6% Gre-BiOBr,10%Gre-BiOBr and 14% Gre-BiOBr,respectively. The materials were characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM),transmission electron microscopy( TEM),ultraviolet-visible diffuse reflectance spectroscopy( UV-Vis DRS),fluorotrophotometer( PL) and Brunauer-Emmett- Teller( BET). The results showed that the as-prepared catalysts were the diagonal square crystal shape( JCPDS card no: 78-0348),and the sheet of them were about 500 ~ 1 000 nm sheets. Compared with pure BiOBr,the photocatalytic activity of Gre-BiOBr was significantly improved on the degradation of Rhodamine B( RhB) and Salicylicacid( SA) under visible light irradiation( λ≥420 nm). The 10% Gre-BiOBr catalyst showed the best photocatalytic activity and the degradation rate of RhB( k10% Gre-BiOBr= 0. 046 min-1) was twice than that of pure BiOBr( kBiOBr= 0. 020 min-1). The specific surface area and the band gap( Eg) of 10% Gre-BiOBr catalyst were 10. 50 m2·g-1and 2. 61 eV( ~ 475 nm). Based on the free radicals captured experiments,the catalytic mechanism was mainly related to the common oxidation of the super oxygen radical( O2·-) and holes( h+). The photocatalytic activity of 10% Gre-BiOBr was excellent in the recycle-usage for five times,so it had good stability.
【Fund】: 国家自然科学基金(21377067 21207079 21177072);; 湖北省新世纪人才入选人员优先资助项目(201203);; 中国科学院生态环境研究中心开放基金(KF2011-07)
【CateGory Index】: O643.36
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