Abstract

     A series of novel anatase TiO₂@MIL-101(Cr) composite was synthesized by solvothermal method for photocatalytic degrading bisphenol A (BPA). Compared with pure TiO₂ and MIL-101(Cr), these composites exhibited superior catalytic performance for the BPA photocatalytic degradation. The characterization results determined the chemical structure and combination between TiO₂ and MIL-101(Cr). The optical properties of the composites demonstrated enhanced catalytic efficiency with effectively separating the electron-hole pair and narrowing band gap. Moreover, the TiO₂ amount and surface area in the composites jointly influenced the activity of photocatalytic degradation of BPA, which, meanwhile, was evaluated by changing the initial pH, catalyst dosage and initial BPA concentration. Under optimal condition, 59% TiO₂@MIL-101(Cr) could reach 99.4% BPA degradation and the corresponding rate constant was 0.0138 min^-1 in 240 min under UV irradiation. Furthermore, TiO₂@MIL-101(Cr) possessed the excellent stability and was reusable. The reasonable pathway of BPA degradation was proposed based on the detected intermediates during the degradation, where the oxidative radicals •O₂⁻ played a dominant role.

Keywords: Anatase TiO₂; TiO₂@MIL-101(Cr); Photocatalytic degradation of BPA; Synergistic effect; Photocatalytic mechanism

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Tang, Y.; Yin, X.; Mu, M.; Jiang, Y.; Li, X.; Zhang, H.; Ouyang, T. Beilstein Arch. 2019, 2019141. doi:10.3762/bxiv.2019.141.v1

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