Efficient ytterbium-doped Bi2WO6 photocatalysts: Synthesis, the formation of oxygen vacancies and boosted superoxide yield for enhanced visible-light photocatalytic activity

被引：65

作者：

Li, Xinyang ^{[1
]}

Li, Wenjun ^{[1
]}

Gu, Shaonan ^{[2
]}

Liu, Xintong ^{[1
]}

Li, Hongda ^{[1
]}

Ren, Chaojun ^{[1
]}

Ma, Xiaohui ^{[1
]}

Zhou, Hualei ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Beijing Key Lab Sci & Applicat Funct Mol & Crysta, Beijing 100083, Peoples R China

[2] Qilu Univ Technol, Key Lab Fine Chem Univ Shandong, Sch Chem & Pharmaceut Engn, Shandong Acad Sci, Jinan 25053, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 851卷

基金：

中国国家自然科学基金;

关键词：

Photocatalytic; Yb-Bi2WO6; Oxygen vacancies; Superoxide anion radicals; RHODAMINE-B; REDOX CENTERS; HETEROJUNCTION PHOTOCATALYST; BI2MOO6; NANOSHEETS; CRYSTAL-STRUCTURE; METHYL-ORANGE; DEGRADATION; TIO2; FABRICATION; COMPOSITE;

D O I：

10.1016/j.jallcom.2020.156935

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：

Yb-doped Bi2WO6 nanomaterials were successfully synthesized using a mild hydrothermal method. Remarkably, Yb-doped Bi2WO6 photocatalysts exhibited a higher photocatalytic activity than pristine Bi2WO6 by degrading RhB under visible light irradiation. The optimum mass ratio of Yb to Bi2WO6 was 2.0%, and it presented the highest photo-degradation efficiency. The crystal structures, morphologies, surface chemical states, and optical properties of the as-synthesized photocatalysts were carried out by XRD, SEM, XPS and DRS, respectively. The results of electron paramagnetic resonance spectroscopy, radical trapping experiments, photoluminescence spectroscopy and photocurrent measurements indicated that the Yb-doped Bi2WO6 samples produced more oxygen vacancies and superoxide anion active groups (center dot O-2(-)), inhibited the recombination of the photo-generated electron-hole pairs, and enhanced the photo-degradation performance. As a result, the dopant Yb3+ could enhance photocatalytic performance of Bi2WO6 by introducing oxygen vacancies into its lattice. This study provides a useful strategy for developing effective visible light photocatalysts. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：9

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