A direct Z-scheme oxygen vacant BWO/oxygen-enriched graphitic carbon nitride polymer heterojunction with enhanced photocatalytic activity

被引：98

作者：

Huo, Xiuqin ^{[1
,2
]}

Yang, Yang ^{[1
,2
]}

Niu, Qiuya ^{[1
,2
]}

Zhu, Yuan ^{[1
,2
]}

Zeng, Guangming ^{[1
,2
]}

Lai, Cui ^{[1
,2
]}

Yi, Huan ^{[1
,2
]}

Li, Minfang ^{[1
,2
]}

An, Ziwen ^{[1
,2
]}

Huang, Danlian ^{[1
,2
]}

Fu, Yukui ^{[1
,2
]}

Li, Bisheng ^{[1
,2
]}

Li, Ling ^{[1
,2
]}

Zhang, Mingming ^{[1
,2
]}

机构：

[1] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China

[2] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2021年 / 403卷

基金：

中国国家自然科学基金;

关键词：

OCN; BWO-OV; Oxygen vacancy; Z-scheme heterojunction photocatalyst; Tetracycline degradation; WASTE-WATER; HYDROGEN-PEROXIDE; DEGRADATION; DRIVEN; BI2WO6; REMOVAL; TETRACYCLINE; FABRICATION; NANOCOMPOSITE; REDUCTION;

D O I：

10.1016/j.cej.2020.126363

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A high-performance micro-nano photocatalyst is urgently needed in the green and economical photocatalytic process for energy utilization and organic pollution control. Herein, a 3D Z-scheme heterojunction consisting of oxygen vacant bismuth tungstate nanosheets (BWO-OV) and oxygen-enriched graphitic carbon nitride (OCN) was developed, which shows large specific surface area and good electrical conductivity. A built-in electric field can be formed in this 3D structure, which accelerates the interfacial charge transfer. The oxygen vacancies of BWO-OV allow the formation of local defect energy levels below conduction band, which can improve the light harvesting capability. The oxygen-rich structure of OCN benefits the oxygen reduction to generate H2O2, and the black body nature enhance the light absorption capability. As expected, the BWO-OV/OCN heterojunction showed unusual photocatalytic efficiency toward the degradation of tetracycline (TC) (0.047 min(-1)) under visible light. The photogenerated holes (h(+)) and superoxide radicals (center dot O-2(-)) were found to play the main roles in TC degradation process. Moreover, the effect of actual water matrix on TC degradation over BWO-OV/OCN heterojunction was investigated. This work highlights a feasible way to design high-efficiency oxygen vacant bismuth-based photocatalysts, which shows the potential for real wastewater treatment.

引用

页数：12

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