Preparation and Photoelectrocatalytic Perfermance of Bi2MoO6@CQDs/TiO2 Nanotube Arrays

Abstract

Abstract: In this work, TiO₂ nanotube arrays (TNA) were modified through the incorporation of Bi₂MoO₆ and carbon quantum dots (CQDs), to improve the visible light photocatalytic activity of TiO₂. The CQDs, Bi(NO₃)₃·5H₂O, and Na₂MoO₄ were used as the starting materials, a facile solvothermal method was employed to fabricate the novel Bi₂MoO₆@CQDs/TNA composite through the deposition of CQDs and Bi₂MoO₆ into the TNA. Based on the SEM and elemental mapping results, CQD and Bi₂MoO₆ are successfully coated on the tube wall of TNA. Moreover, the photocatalytic performance of Bi₂MoO₆@CQDs/TNA composite was investigated through the degradation of methyorange (MO) solution under the visible light irradiation. The corresponding photoelelctrocatalytic test results confirm that the as-prepared Bi₂MoO₆@CQDs/TNA exhibits an enhanced photoelectrocatalytic activity. Bi₂MoO₆@CQDs/TNA has a 32% higher removal rate of MO than Bi₂MoO₆/TNA. The enhanced activity can be attributed to the excellent up-conversion photoluminescence (UCPL) of CQDs, promoting TiO₂ to generate photogenerated carriers under the visible light. Meanwhile, the heterojunction between Bi₂MoO₆ and TiO₂ can also effectively inhibit the recombination of photogenerated carriers.

Key words: TiO₂ nanotube arrays, carbon quantum dots, Bi₂MoO₆, visible light, photoelectrocatalytic, up-conversion photoluminescence

CLC Number:

O643

ZHANG Dalong, HE Shuo, LIN Zuxiang, DAI Gaopeng, LIU Suqin, XIAO Zuoan, CAI Shuang. Preparation and Photoelectrocatalytic Perfermance of Bi₂MoO₆@CQDs/TiO₂ Nanotube Arrays[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4137-4143.

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Preparation and Photoelectrocatalytic Perfermance of Bi₂MoO₆@CQDs/TiO₂ Nanotube Arrays

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