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J Hazard Mater

Title:		"Volatile organic compounds generation pathways and mechanisms from microplastics in water: Ultraviolet, chlorine and ultraviolet/chlorine disinfection"
Author(s):		Liu R; Wu X; Zhang W; Chen Y; Fu J; Ou H;
Address:		"Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 511443, China; Center for Environmental Microplastics Studies, Jinan University, Guangzhou 511443, China. Guangdong Provincial Academy of Building Research Group Go., Ltd, Guangzhou 510000, China. Center for Environmental Microplastics Studies, Jinan University, Guangzhou 511443, China. Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 511443, China; Center for Environmental Microplastics Studies, Jinan University, Guangzhou 511443, China. Electronic address: touhuase@jnu.edu.cn"
Journal Title:		J Hazard Mater
Year:		2023
Volume:		20220823
Issue:
Page Number:		129813 -
DOI:		10.1016/j.jhazmat.2022.129813
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"Disinfection in water treatments induces microplastics (MPs) to produce various derivative products, among which the volatile organic compounds (VOCs) are still poorly understood. Ultraviolet (UV), chlorine and UV/chlorine disinfections were used to treat polypropylene (PP), polystyrene (PS) and polyvinylchloride (PVC) in this study. Modifications were observed on the MP surfaces, including melting, cracks, folds, and even forming oxygen-containing structures, resulting in the release of a diversity of VOCs. The polymer types of MPs influenced the VOCs characteristics. PP released alkanes, alkenes and aldehydes, while PVC released alkanes, alkenes and halogenated hydrocarbons. VOCs from PS were dominated by unique aromatic alkanes, alkenes and aldehydes. These derived VOCs are generated during different disinfections with distinct mechanisms. UV-C at 254 nm induced direct scission and radical oxidation on MPs. The derived VOCs were mainly bond-breaking fragments. Chlorination relied on HOCl/OCl(-) electrophilic reactions, resulting fewer VOCs since C-C skeleton MPs have strong resistance to electrophilic reactions. UV/chlorination promotes the generation of chlorine radicals and hydroxyl radicals, thereby causing oxidative damage. Various oxidized VOCs, such as benzaldehyde and acetophenone, were formed. The disinfection reactions can produce various VOCs from MPs, posing potential risks to the ecological environment and human beings"
Keywords:		"Acetophenones Alkanes Benzaldehydes Chlorine/chemistry Disinfection/methods Halogenation Humans *Hydrocarbons, Halogenated Microplastics Oxygen Plastics Polypropylenes Polystyrenes Polyvinyl Chloride Ultraviolet Rays *Volatile Organic Compounds *Water Pol;"
Notes:		"MedlineLiu, Ruijuan Wu, Xinni Zhang, Wanhui Chen, Yuheng Fu, Jianwei Ou, Huase eng Research Support, Non-U.S. Gov't Netherlands 2022/09/06 J Hazard Mater. 2023 Jan 5; 441:129813. doi: 10.1016/j.jhazmat.2022.129813. Epub 2022 Aug 23"