Synergistic effect of internal electric field and oxygen vacancy on the photocatalytic activity of BiOBrxI1-x with isomorphous fluorine substitution

被引：64

作者：

Ren, Xuejun ^{[1
]}

Li, Jibiao ^{[1
]}

Cao, Xingzhong ^{[2
]}

Wang, Baoyi ^{[2
]}

Zhang, Yanfeng ^{[1
]}

Wei, Yu ^{[1
]}

机构：

[1] Hebei Normal Univ, Coll Chem & Mat Sci, Natl Demonstrat Ctr Expt Chem Educ, Shijiazhuang 050024, Hebei, Peoples R China

[2] Chinese Acad Sci, Inst High Energy Phys, Multidiscipline Res Div, Beijing 100049, Peoples R China

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2019年 / 554卷

基金：

中国国家自然科学基金;

关键词：

Fluorine substitution; BiOBrxI1-x; Internal electric field; Oxygen vacancy; Photocatalytic activity; CHARGE SEPARATION; BIOX X; NITROGEN-FIXATION; SOLID-SOLUTION; CO2; REDUCTION; NANOCOMPOSITES; PERFORMANCE; DEGRADATION; FACETS; STEP;

D O I：

10.1016/j.jcis.2019.07.034

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Recently, bismuth oxyhalide photocatalysts have attracted much attention owing to their unique layered structure. In this paper, fluorine isomorphously substituted BiOBrxI1-x solid solution was synthesized by controlling the molar ratios of F, Br and I elements by the chemical precipitation method at room temperature. It was found that BiOF0.4Br0.5I0.1 exhibited excellent photocatalytic activity for the degradation of methyl orange, which was 10.1, 5.0 and 4.3 times higher than that of BiOI, BiOBr and BiOBr0.9I0.1 under visible light irradiation, respectively. It could be inferred that fluorine substitution is favorable to enhance the internal electric field (IEF) for BiOBrxI1-x with layered structure, which could improve the separation efficiency of the photogenerated holes and electrons and thus enhance the photocatalytic activity. On the other hand, the concentration of oxygen vacancies (OVs) rose with the increase of fluorine content, which could facilitate the adsorption of pollutants and serve as trapping sites for photo-induced carriers to improve the photocatalytic activity. The finding provides new insights into the synergistic effect of IEF and OVs toward the construction of high efficient photocatalysts. (C) 2019 Elsevier Inc. All rights reserved.

引用

页码：500 / 511

页数：12

共 55 条

[1] Low temperature preparation of oxygen-deficient tin dioxide nanocrystals and a role of oxygen vacancy in photocatalytic activity improvement [J].