Intensive photocatalytic activity enhancement of Bi5O7I via coupling with band structure and content adjustable BiOBrxI1-x  

作　　者：Xin Li Tiedan Chen Haili Lin Jing Cao Hongwei Huang Shifu Chen 

机构地区：[1]College of Chemistry and Materials Science/Information College,Huaibei Normal University,Huaibei 235000,China [2]State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China [3]Anhui Key Laboratory of Energetic Materials,Huaibei 235000,China [4]School of Materials Science and Technology,China University of Geosciences,Beijing 100083,China

出　　处：《Science Bulletin》2018年第4期219-227,共9页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51772118,51472005);State Key Laboratory of Structural Chemistry(20160014);Anhui Provincial Natural Science Foundation(1708085MB32);the Natural Science Foundation of Educational Committee of Anhui Province(gxyq ZD2016414,KJ2014B08);Innovation Team of Design and Application of Advanced Energetic Materials

摘　　要：Band structure and component content are the key factors for determining the activity of semiconductor heterojunction. In this study, a novel Bi5O7I/BiOBrxI1-x heterostructure was synthesized by a simple hydrobromic （HBr） acid etching method through transforming partial of Bi5O7I to I ion doped BiOBr （BiOBrxI1-x） at room temperature without adding extra dopant. Both the band structure and component content of Bi5O7I/BiOBrxI1-x alter with the additive HBr acid. The Bi5O7I/BiOBrxI1-x （S3.0） sample exhibits the best photocatalytic activity, 6 times higher than that of pure Bis071, for the degradation of methyl orange under visible-light （2 〉 420 nm）. The activity enhancement of Bi5O7I/BiOBrxI1-x is primarily ascribed to the improved separation efficiency of photocharges, originated from the adjustable band structure and component content, The significant findings of this paper provide a facile way to construct highly efficient semiconductor heterojunction via playing the synergetic effect of adjustable band struc- ture and component content for purifying organic pollutants in wastewater.Band structure and component content are the key factors for determining the activity of semiconductor heterojunction. In this study, a novel Bi_5O_7I/BiOBr_xI_(1-x)heterostructure was synthesized by a simple hydrobromic(HBr) acid etching method through transforming partial of Bi_5O_7I to Iàion doped Bi OBr(BiOBr_xI_(1-x)) at room temperature without adding extra dopant. Both the band structure and component content of Bi_5O_7I/BiOBr_xI_(1-x)alter with the additive HBr acid. The Bi_5O_7I/BiOBr_xI_(1-x)(S3.0) sample exhibits the best photocatalytic activity, 6 times higher than that of pure Bi_5O_7I, for the degradation of methyl orange under visible-light(λ > 420 nm). The activity enhancement of Bi_5O_7I/BiOBr_xI_(1-x)is primarily ascribed to the improved separation efficiency of photocharges, originated from the adjustable band structure and component content. The significant findings of this paper provide a facile way to construct highly efficient semiconductor heterojunction via playing the synergetic effect of adjustable band structure and component content for purifying organic pollutants in wastewater.

关 键 词：Bi5O7I/BiOBrxI1-xBand structureComponent contentPhotocatalytic activity 

分 类 号：O643.36[理学—物理化学] X703[理学—化学]