Metal-organic frameworks derived C/TiO2 for visible light photocatalysis: Simple synthesis and contribution of carbon species

Xin He; Ming Wu; Zhimin Ao; Bo Lai; Yanbo Zhou; Taicheng An; Shaobin Wang

doi:10.1016/j.jhazmat.2020.124048

Metal-organic frameworks derived C/TiO₂ for visible light photocatalysis: Simple synthesis and contribution of carbon species

J Hazard Mater. 2021 Feb 5:403:124048. doi: 10.1016/j.jhazmat.2020.124048. Epub 2020 Sep 19.

Authors

Xin He¹, Ming Wu¹, Zhimin Ao², Bo Lai³, Yanbo Zhou⁴, Taicheng An¹, Shaobin Wang⁵

Affiliations

¹ Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China.
² Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: zhimin.ao@gdut.edu.cn.
³ State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
⁴ State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, No. 130 Meilong Road, Xuhui District, Shanghai 200237, China.
⁵ School of Chemical Engineering and Advanced Materials, University of Adelaide, Adelaide, SA 5005, Australia. Electronic address: shaobin.wang@adelaide.edu.au.

PMID: 33265056
DOI: 10.1016/j.jhazmat.2020.124048

Abstract

A series of in-situ carbon-doped TiO₂ (C_x/TiO₂) composites with a porous and crystalline structure were successfully synthesized via one-step and low-temperature calcination of titanium metal-organic framework (MOF), MIL-125(Ti). The resultant materials were comprehensively investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), N₂ adsorption-desorption measurements, UV-vis diffuse reflectance spectrum (DRS), photoluminescence (PL) spectra and photoelectrochemical measurements, and their photocatalytic activities for bisphenol A (BPA) degradation were assessed. Compared with the benchmark TiO₂ photocatalyst (P25), the C_x/TiO₂ composite material with high specific surface, lower band gap, and reduced photogenerated electron hole ratio exhibited outstanding photodegradation activity and durability for BPA, which could be attributed to the combined effect of co-doping of multiple carbon species (substituent carbon and carbonate) and porous structure. During BPA degradation, the holes and superoxide radicals were the primary role oxidative species in the reaction process. Therefore, this new efficient photocatalyst is promising candidate for photodegradation of organic pollutants.

Keywords: Bisphenol A; Carbon doping; MIL-125(Ti); Photocatalysis; TiO(2).