High-Efficiency Photocatalytic Degradation of Tannic Acid Using TiO2 Heterojunction Catalysts

Ruixi Liu; Linzhen Wu; Hao Liu; Youkui Zhang; Jianjun Ma; Cairong Jiang; Tao Duan

doi:10.1021/acsomega.1c02500

High-Efficiency Photocatalytic Degradation of Tannic Acid Using TiO₂ Heterojunction Catalysts

ACS Omega. 2021 Oct 22;6(43):28538-28547. doi: 10.1021/acsomega.1c02500. eCollection 2021 Nov 2.

Authors

Ruixi Liu^{1

2

3}, Linzhen Wu^{2

3}, Hao Liu^{2

3}, Youkui Zhang^{2

3}, Jianjun Ma¹, Cairong Jiang¹, Tao Duan^{2

3}

Affiliations

¹ School of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, P. R. China.
² National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
³ State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, P. R. China.

Abstract

Photocatalysts have been extensively used for hydrogen evolution or organic degradation. In this work, two different heterojunction types of composite photocatalysts, 1T-MoS₂@TiO₂ with Schottky heterojunction and 2H-MoS₂@TiO₂ with type-II heterojunction, are synthesized via hydrothermal synthesis. These two composite materials exhibit excellent photocatalytic activity toward the degradation of tannic acid, which is a typical organic in nuclear wastewater. At an optimal loading of 16% 1T-MoS₂, the 1T-MoS₂@TiO₂ shows the highest degradation capacity of 98%, which is 3.2 times higher than that of pure TiO₂. The degradation rate of 16% 1T-MoS₂@TiO₂ is much higher than that of 13% 2H-MoS₂@TiO₂. The enhanced photocatalytic activity might be attributed to the improved charge transfer according to the mechanism investigation, supported by the X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) analyses. This work provides new opportunities for constructing highly efficient catalysts for nuclear waste disposal.