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

Hua, Chenghe, Dong, Xiaoli, Wang, Yu, Zheng, Nan, Ma, Hongchao, Zhang, Xiufang
Journal of materials science 2019 v.54 no.13 pp. 9397-9413
absorption, bismuth, irradiation, microparticles, nanosheets, nitrogen fixation, oxygen, photocatalysis, photocatalysts, pollutants, pollution, rhodamines, solar energy
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 H₂₀₀-1.0Bi@BiOBr > H₂₅₀-1.0Bi@BiOBr > H₁₅₀-1.0Bi@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.