Preparation of TiO 2 /Sponge Composite for Photocatalytic Degradation of 2,4,6-Trichlorophenol
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Preparation of TiO2/Sponge Composite for Photocatalytic Degradation of 2,4,6-Trichlorophenol Tianyu Zhao & Hao Cheng & Yinna Liang & Jianhua Xiong Hongxiang Zhu & Shuangfei Wang & Jiaxiang Liang & Guoning Chen
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Received: 2 April 2020 / Accepted: 13 July 2020 # Springer Nature Switzerland AG 2020
Abstract Photocatalysis has emerged as a promising approach for treating environmental pollution. In this study, TiO2/sponge composites with good photocatalytic activity in visible light were prepared via a simple and efficient low-temperature process and applied to the degradation of 2,4,6-trichlorophenol (2,4,6-TCP) present in papermaking wastewater. The process conditions for preparing TiO2/sponge composites were optimized by varying the TiO2 dosage, cellulose dosage, and surfactant concentration. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) results showed that TiO2 successfully adhered to the sponge surface and that the composites achieved a good recycling effect. Degradation occurred under visible light, and a degradation rate of 81% for 2,4,6-TCP with initial concentration of 20 mg/L was achieved in 4 h.
The fragments were analyzed using ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS), which revealed the formation of 2hydroxyvaleric acid (2-HVA) as a degradation product; a possible degradation mechanism is proposed to interpret these findings. Visible-light photocatalysis shows high potential for the rapid and environmentally friendly destruction of organic pollutants in papermaking wastewater.
T. Zhao : Y. Liang : J. Xiong : H. Zhu : S. Wang : J. Liang Guangxi University, Nanning 530004, China
The rapid development of the papermaking industry has contributed significantly to water pollution owing to the disposal of industrial wastes such as chlorophenols and chlorinated hydrocarbons into water bodies (Xie et al. 2016). In particular, 2,4,6-trichlorophenol (2,4,6-TCP) is a major component of the phenolic derivatives present in papermaking wastewater (S. Yao et al. 2017). Even in low dosages, this compound is toxic and mutagenic to organisms, disrupts the endocrine systems of organisms, and cannot easily be absorbed and degraded by microorganisms (B. Yao et al. 2011). 2,4,6-TCP has been listed as a priority pollutant in the USA, China, and other countries (Olaniran and Igbinosa 2011; Shi et al. 2003). The stable carbon–chlorine bond and position of chlorine atoms relative to the hydroxyl group in 2,4,6-
T. Zhao : H. Cheng : Y. Liang : J. Xiong (*) : H. Zhu : S. Wang : J. Liang Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China e-mail: [email protected] H. Cheng Guangxi Key Laboratory of Green Processing of Sugar Resources, College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou 545006 Guangxi, People’s Republic of China G. Chen Guangxi Bossco Environmental Protection Technology Co., Ltd, Nanning 530007, China
Keywords TiO2 . Photocatalysis . 2,4,6Trichlorophenol
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