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Degradation of Trichloromethane by the Combination of UV Irradiation and Peroxymonosulfate

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Abstract:

Trichloromethane (TCM) is a harmful halogenated organic compound usually used in the industry and a typical disinfection by-product in the water treatment with the use of chorine as disinfectant. The degradation of TCM by peroxymonosulfate combined with UV irradiation at λ= 254 nm (UV/PMS) was investigated. Results showed that TCM was efficiently degraded by UV/PMS and about 80% of TCM was decomposed when the concentration of PMS was 0.5mM. Radical-scavenging experimental results indicated that both HO• and SO4•- might contribute to the degradation of TCM. However, HO• might first be captured by PMS to form SO5•- and then partly decomposed into SO4•-, which might react with TCM. The increased concentration of PMS led to the increased removal efficiency of TCM. Whilst, the efficiency was little affected by initial concentration of TCM, indicating that there might be competition reaction with TCM degradation for radicals.

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Periodical:

Advanced Materials Research (Volumes 518-523)

Pages:

2479-2483

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.518-523.2479

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Online since:

May 2012

Authors:

Ying Hong Guan, Jun Ma, Xu Chun Li, Jing Yun Fang, Peng Guo

Keywords:

Hydroxyl Radical, Peroxymonosulfate, Sulfate Radical, Trichloromethane, UV

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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