Zn-doped Bi2MoO6 supported on reduced graphene oxide with increased surface active sites for degradation of ciprofloxacin
2022
Wang, Qiang | Chen, Zhongjing | Shi, Meng | Zhao, Yitao | Ye, Jingrui | He, Guangyu | Meng, Qi | Chen, Haiqun
The reduced graphene oxide supported Zn-doped Bi₂MoO₆ nanocomposites (ZnₓBi₂₋ₓMoO₆/RGO) are synthesized by an easy one-step solvothermal method for the rapid degradation of ciprofloxacin (CIP). Characterization analyses show that Bi₂MoO₆ nanosheets are uniformly supported on RGO, for which the agglomeration of Bi₂MoO₆ is effectively inhibited, leading to more exposure of surface active sites. The degradation rate of Zn₀.₁Bi₁.₉MoO₆/RGO₅ on CIP reached 90% after 120 min of visible light irradiation, which was 10.4 times the rate of unsupported Bi₂MoO₆. Zn doping and RGO loading synergistically reduce the recombination rate of photogenerated electron–hole pairs and result in the enhanced photocatalytic performance. Compared with previously reported catalysts, Zn₀.₁Bi₁.₉MoO₆/RGO₅ can get higher degradation efficiency with shorter time and less dosage. In addition, after five cycles, the degradation efficiency is maintained at about 85%, showing perfect cycling stability of Zn₀.₁Bi₁.₉MoO₆/RGO₅. Photocatalytic mechanism suggests that the photogenerated •O₂⁻ and h⁺ are main species for degrading CIP based on ZnₓBi₂₋ₓMoO₆/RGO complex.
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