Dipole Moment and Built-In Polarization Electric Field Induced by Oxygen Vacancies in BiOX for Boosting Piezoelectric-Photocatalytic Removal of Uranium(VI)

被引：17

作者：

Gao, Donglin ^{[1
]}

Dong, Zhimin ^{[1
]}

Feng, Weilong ^{[2
]}

Li, Zifan ^{[1
]}

Wu, Hanting ^{[1
]}

Wu, Yunxuan ^{[1
]}

Wei, Qianglin ^{[1
]}

Meng, Cheng ^{[1
]}

Wu, Yongchuan ^{[1
]}

Wang, Youqun ^{[1
]}

Xu, Lin ^{[1
]}

Cao, Xiaohong ^{[1
]}

Zhang, Zhibin ^{[1
]}

Liu, Yunhai ^{[1
]}

机构：

[1] East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China

[2] Jiangxi Nucl Ind Environm Protect Ctr, Nanchang 330013, Jiangxi, Peoples R China

来源：

INORGANIC CHEMISTRY | 2024年 / 63卷 / 13期

基金：

中国国家自然科学基金;

关键词：

DEGRADATION; REDUCTION; CO2; NANOPARTICLES; MICROSPHERES; SEPARATION; SORPTION; UV;

D O I：

10.1021/acs.inorgchem.3c04487

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Piezoelectric-photocatalysis is distinguished by its piezoelectricity as an external force that induces deformation within the catalyst to engender a polarized electric field compared to conventional photocatalysis. Herein, the piezoelectric photocatalyst BiOBr has been expertly synthesized via a plasma process and applied for piezoelectric-photocatalysis removal of uranium(VI) for the first time. The abundant surface oxygen vacancies (OVs) could induce a dipole moment and built-in electric field, which endows BiOBr with excellent separation and transport efficiency of photogenerated charges to actuate more charges to participate in the piezoelectric-photocatalytic reduction process. Consequently, under visible light and ultrasound (150 W and 40 kHz), the removal rate constant of OVs-BiOBr-30 (0.0306 min(-1)) was 2.4, 30.6, and 6 times higher than those of BiOBr (0.01273 min(-1)), ultrasound, or photocatalysis, respectively. The piezoelectric-photocatalytic synergy is also universal for BiOX (X = Cl, Br, or I) to accelerate the reduction rate of uranium(VI). This work highlights the role of piezoelectric-photocatalysis in the treatment of uranium-containing wastewater, which is of great significance for resource conservation and environmental remediation.

引用

页码：5931 / 5944

页数：14