CuBi2O4 and rGO co-modified 3D hierarchical flower-like Bi5O7I nanoflakes as Z-scheme heterojunction for enhanced photocatalytic performance

被引：59

作者：

Xu, Chengyang ^{[1
]}

Yan, Ke ^{[1
]}

Wang, Peiying ^{[1
]}

Zhou, Xiaohong ^{[1
]}

Zhang, Tongtong ^{[1
]}

Fu, Yiwen ^{[1
]}

Yan, Qishe ^{[1
]}

机构：

[1] Zhengzhou Univ, Coll Chem, Zhengzhou 450001, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2021年 / 257卷

关键词：

Photodegradation activity; CBO/Bi5O7I; Reduced graphene oxide; Z-scheme mechanism; Sewage purification; BROAD-SPECTRUM; DEGRADATION; CONSTRUCTION; MICROSPHERES; TETRACYCLINE;

D O I：

10.1016/j.seppur.2020.117935

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The three-dimensional (3D) flower-shaped layered Bi5O7I nanosheets exhibited tremendous potential in wiping out hazardous organics of sewage due to appropriate band structure and rich surface for attachment of reactants, modified with CuBi2O4 (CBO) and reduced graphene oxide (rGO) further enhancing its photocatalytic effects. Herein, a novel, stabilized and efficient CBO/Bi5O7I@rGO photocatalyst was constructed via sequential hydrothermal process, and the microstructures, physicochemical and optical properties were further researched by serial means such as XRD, XPS, FESEM-EDS, TEM, UV-vis DRS, PT, EIS and physical absorption. SEM and TEM manifested that the composite was successfully prepared and gossamer rGO as a co-catalyst, which is not only conducive to the separation of photo-generated carrier but also facilitates photocatalytic removal pollutants. Furthermore, the photodegradation tests indicated that CBO/Bi5O7I@1.5% rGO sample displayed the highest removal rates towards contaminations such as tetracycline hydrochloride (91%), Rhodamine B (77%) and ciprofloxacin (92%) under visible-light, respectively. Besides, the addition of higher initial concentrations and certain anions inhibited photocatalytic efficiency, which perhaps was due to greater competition with contaminations towards active radicals. Finally, the capture experiment and electron spin resonance (ESR) test certified that superoxide radicals (center dot O-2(-)) are the direct active group, whereas the holes (h(+)) and hydroxyl radicals (center dot OH) exert a supporting role. This work could offer an actual and doable design for constructing of efficient Z-scheme system using rGO as an auxiliary catalyst to sewage remediation.

引用

页数：13

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