Bi-modified 3D BiOBr microsphere with oxygen vacancies for efficient visible-light photocatalytic performance

• Published in: Journal of materials science Vol. 54; no. 13; pp. 9397 - 9413
• Main Authors: Hua, Chenghe, Dong, Xiaoli, Wang, Yu, Zheng, Nan, Ma, Hongchao, Zhang, Xiufang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.07.2019; Springer; Springer Nature B.V
• Subjects: Catalytic activity; Characterization and Evaluation of Materials; Chemical Routes to Materials; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Diameters; Electromagnetic absorption; Energy conversion; Fixation; Light irradiation; Materials Science; Microspheres; Nitrogen; Nitrogenation; Oxygen; Performance degradation; Photocatalysis; Photocatalysts; Photodegradation; Pollutants; Polymer Sciences; Rhodamine; Self-assembly; Solar energy; Solid Mechanics; Vacancies; Water pollution; Water purification
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-019-03556-y

Flower-like Bi that deposited BiOBr with oxygen vacancies (OVs) has been successfully fabricated via a simple solvothermal method followed by an easy hydrogenated treatment. The characterization results show that three-dimensional (3D) H-1.0Bi@BiOBr microspheres with the diameter about 1.2–1.5 μm were self-assembled by countless two-dimensional (2D) interlaced BiOBr nanosheets. Bi-deposited and oxygen vacancies endowed the H-1.0Bi@BiOBr samples with a dramatically enhanced photocatalytic performance for the degradation of organic pollutants (Rhodamine B and Ofloxacin) and the solar-energy nitrogen fixation. It disclosed that the photocatalytic performance order of the photocatalyst was H 200 -1.0Bi@BiOBr > H 250 -1.0Bi@BiOBr > H 150 -1.0Bi@BiOBr > 1.0Bi@BiOBr > 2.0Bi@BiOBr > 0.5Bi@BiOBr > BiOBr. Particularly, the enhanced photocatalytic activity was ascribed to higher BET specific area, enhanced visible-light absorption, effective photoinduced charge separation and suitable amounts of oxygen vacancies. The H-1.0Bi@BiOBr samples also showed good photochemical stability under repeated visible-light irradiation. This work could shed light on exploring high-photocatalytic-property materials and stimulating the development of OVs-Bi@BiOBr photocatalysts, which had great potential for the solar-energy conversion, environmental purification and organic pollution treatment in water.