Oxygen vacancies-modified S-scheme Bi2Ti2O7/CaTiO3 heterojunction for highly efficient photocatalytic NO removal under visible light

被引：38

作者：

Li, Nan ^{[1
,2
]}

Shi, Menglin ^{[1
]}

Xin, Yue ^{[1
]}

Zhang, Wei ^{[1
]}

Qin, Jiani ^{[1
]}

Zhang, Ke ^{[1
]}

Lv, Haiqin ^{[2
]}

Yuan, Mingzhe ^{[2
]}

Wang, Chuanyi ^{[1
,2
]}

机构：

[1] Shaanxi Univ Sci & Technol, Sch Environm Sci & Engn, Xian 710021, Peoples R China

[2] Guangzhou Inst Ind Intelligence, Guangzhou 511400, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2022年 / 10卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Photocatalysis; S-scheme Bi2Ti2O7/CaTiO3 heterojunction; Oxygen vacancy; NO removal; FERROELECTRIC PROPERTIES; NANOCOMPOSITES; DEGRADATION; PERFORMANCE;

D O I：

10.1016/j.jece.2022.107420

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Photocatalytic NO removal is limited by many factors, such as high recombination rate of photogenerated charge carriers and secondary pollution caused by incomplete oxidation. Here, S-scheme Bi2Ti2O7/CaTiO3 heterojunction composites with oxygen vacancies were prepared by solvothermal synthesis in conjunction with calcination. After Bi2Ti2O7/CaTiO3 calcined at 600 degrees C, the photocatalytic NO removal efficiency increases from 58% to 78% under visible light with the lowest production of intermediate NO2, where the initial concentration of NO was diluted to ca. 600 ppb by air stream and the flow rate was controlled at 1 L.min(-1). The enhanced photocatalytic performance is attributed to the synergistic effect of S-scheme heterojunction structure and oxygen vacancy as evinced by ESR and XPS analysis. Active species trapping experiments suggest that photo-generated electrons, superoxide ions and holes are the main active species in the photocatalytic NO conversion. This study provides a reference for the design of highly efficient visible-light responsive photocatalyst by construction of S-scheme heterojunction and oxygen vacancy simultaneously.

引用

页数：7

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