Preparation of Bi4O5Br2/Ti3C2-Ru Composite Photocatalysts and Their Degradation Performances for Sulfamethoxazole

Abstract

Abstract: Bi_xO_yBr_z photocatalysts display great application potential in the field of organic pharmaceutical wastewater treatment, but the high recombination rate of photogenerated electron-hole pairs limits their application. In this work, Ti₃C₂ with excellent electron transfer performance was selected as a cocatalyst. Firstly, Ti₃C₂-Ru cocatalyst was prepared by taking full use of abundant surface Ti vacancy defects and high reduction ability of Ti₃C₂, then Bi₄O₅Br₂/Ti₃C₂-Ru composite photocatalysts were prepared by realizing in-situ growth of Bi₄O₅Br₂ on Ti₃C₂-Ru surface through the ionic bonding force between Ti₃C₂ surface functional groups and Bi³⁺. This special structure ensures the directional transfer of electrons from Bi₄O₅Br₂ to Ti₃C₂ and then to the reaction active site of Ru, thereby the composite catalysts exhibit higher photogenerated carrier separation rate and lower interfacial charge transfer resistance, which effectively inhibit the recombination rate of photogenerated electron-hole pairs. The photocatalytic performance of composite photocatalysts were evaluated by the sulfamethoxazole (SMX) degradation efficiency. The results reveal that the Bi₄O₅Br₂/Ti₃C₂-Ru composite photocatalysts exhibit excellent photocatalytic performance on SMX degradation. The optimum removal efficiency of SMX reaches 95.1% under 75 min visible-light irradiation, which increase 36.9 percentage points of pure Bi₄O₅Br₂ and 25.3 percentage points of Bi₄O₅Br₂/Ti₃C₂, respectively. Finally, the underlying photocatalytic mechanism was elucidated based on the radical scavenging experiments and catalyst band structure. This results will provide a novel design idea for the construction of photocatalyst with pharmaceutical wastewater treatment capability.

Key words: Bi₄O₅Br₂/Ti₃C₂-Ru, composite photocatalyst, sulfamethoxazole, separation efficiency of electron-hole pair, electron directional transfer, photocatalytic degradation

CLC Number:

X131
X703.1

ZHANG Lei, LI Rui, FAN Caimei. Preparation of Bi₄O₅Br₂/Ti₃C₂-Ru Composite Photocatalysts and Their Degradation Performances for Sulfamethoxazole[J]. Journal of Synthetic Crystals, 2022, 51(7): 1248-1256.

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Preparation of Bi₄O₅Br₂/Ti₃C₂-Ru Composite Photocatalysts and Their Degradation Performances for Sulfamethoxazole

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