One-pot solvothermal fabrication of S-scheme OVs-Bi2O3/Bi2SiO5 microsphere heterojunctions with enhanced photocatalytic performance toward decontamination of organic pollutants

被引：112

作者：

Dou, Lin ^{[1
,3
]}

Jin, Xingyun ^{[1
]}

Chen, Jiufu ^{[1
]}

Zhong, Junbo ^{[2
]}

Li, Jianzhang ^{[1
]}

Zeng, Ying ^{[3
]}

Duan, Ran ^{[4
]}

机构：

[1] Sichuan Univ Sci & Engn, Coll Chem & Environm Engn, Key Lab Green Catalysis, Higher Educ Inst Sichuan, Zigong 643000, Peoples R China

[2] Sichuan Univ Sci & Engn, Coll Chem Engn, Zigong 643000, Peoples R China

[3] Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu 610059, Peoples R China

[4] Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2020年 / 527卷

基金：

中国国家自然科学基金;

关键词：

Bi2O3/Bi2SiO5; Microspheres; Heterojunctions; Oxygen vacancy; S-scheme; P-N HETEROJUNCTION; SURFACE PHOTOVOLTAGE SPECTROSCOPY; PHOTOINDUCED CHARGE SEPARATION; IN-SITU FABRICATION; OXYGEN-VACANCY; HYDROTHERMAL SYNTHESIS; METHYL-ORANGE; H-2; EVOLUTION; CONGO RED; DEGRADATION;

D O I：

10.1016/j.apsusc.2020.146775

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：

Bi2O3/Bi2SiO5 microsphere heterojunctions self-assembled by nanoplatelets with rich oxygen vacancies (OVs) were fabricated through a mild one-step solvothermal approach. The existence of OVs was confirmed by oS and low temperature electron spin resonance (ESR) technique. The crystal texture, morphology, and optical property of the 3D OVs-Bi2O3/Bi2SiO5 microsphere heterojunctions were analyzed by a series of characterization methods. The results reveal that OVs-Bi2O3/Bi2SiO5 heterojunctions were constructed and the diameter of microspheres is about 1 mu m. The photocatalytic performance of OVs-Bi2O3/Bi2SiO5 composite microspheres was assessed using methyl orange (MO) and colorless phenol as model contaminant. The synergistic effect of Bi2O3 and Bi2SiO5 greatly enhances the removal rates of organic pollutants. center dot O-2(-) and h(+) are predominant active free radicals in the photocatalytic process, supporting by ESR, nitroblue tetrazolium (NBT) and trapping experiments. The separation and transfer of the photoinduced charge pairs of OVs-Bi2O3/Bi2SiO5 heterojunctions follow a step-scheme mechanism. The step-scheme mechanism endows OVs-Bi2O3/Bi2SiO5 heterojunctions with higher photocatalytic performance than the bare Bi2SiO5.

引用

页数：14