Degradation of <em>p</em>-chlorophenol with High-concentration Ozone Cycle Assisted by Photocatalysis and Its Synergy Mechanism

化学工业与工程

Chemcial Industry and Engineering

2021, Vol. 38

Issue (4) :64-72 DOI: 10.13353/j.issn.1004.9533.20201007

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Degradation of p-chlorophenol with High-concentration Ozone Cycle Assisted by Photocatalysis and Its Synergy Mechanism

Yang Maolin, Liu Xinyu, Ma Wei, Zhang Bowen, Cui Zhengwei

Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangsu Wuxi 214122, China

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Abstract High-concentration ozone cycle process assisted by photocatalysis was investigated to solve the limited efficiency and high exhaust emissions in the ozone degradation of p-chlorophenol. When the circulating gas volume was 2.0 L·min^-1 and the dosage of TiO₂ was 250 mg·L^-1, the degradation kinetic coefficient of O₃/TiO₂/UV system was 0.291 min^-1, which was 1.24 times as that of O₃ system. The pH was proportional to the degradation effect in the range of 6.7-11.0. When the pH was 11.0 and the reaction took for 10 min, the degradation rates of 4-CP and COD in the O₃/TiO₂/UV system were 98.21% and 61.68%, respectively. The ·OH and ·O₂^- excited by the trace of TiO₂ in high-concentration ozone water are the primary radicals that promote the generation and degradation of p-benzoquinone and other early products, and the OH^- can also accelerate the generation of the radical.

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	Yang Maolin
	Liu Xinyu
	Ma Wei
	Zhang Bowen
	Cui Zhengwei

Keywords： photocatalysis； high-concentration ozone； p-chlorophenol； hydroxyl radical； benzoquinone

Received 2020-10-26;

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Yang Maolin, Liu Xinyu, Ma Wei, Zhang Bowen, Cui Zhengwei.Degradation of p-chlorophenol with High-concentration Ozone Cycle Assisted by Photocatalysis and Its Synergy Mechanism[J] Chemcial Industry and Engineering, 2021,V38(4): 64-72

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