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A Novel UVA/ClO2 Advanced Oxidation Process for the Degradation of Micropollutants in Water.
Environ Sci Technol. 2022 01 18; 56(2):1257-1266.ES

Abstract

Ultraviolet (UV)-based advanced oxidation processes (AOPs) are increasingly used for the degradation of micropollutants in water and wastewater. This study reports a novel UVA/chlorine dioxide (ClO2) AOP based on the photolysis of ClO2 using energy-efficient UV radiation sources in the UVA range (e.g., UVA-LEDs). At a ClO2 dosage of 74 μM (5.0 mg L-1 as ClO2) and a UV fluence at 47.5 mJ cm-2, the UVA365/ClO2 AOP generated a spectrum of reactive species, including chlorine oxide radicals (ClO•), chlorine atoms (Cl•), hydroxyl radicals (HO•), and ozone at a concentration of ∼10-13, ∼10-15, ∼10-14, and ∼10-7 M, respectively. A kinetic model to simulate the reactive species generation in the UVA365/ClO2 AOP was established, validated against the experimental results, and used to predict the pseudo-first-order rate constants and relative contributions of different reactive species to the degradation of 19 micropollutants in the UVA365/ClO2 AOP. Compared to the well-documented UVC254/chlorine AOP, the UVA365/ClO2 AOP produced similar levels of reactive species at similar oxidant dosages but was much less pH-dependent and required much lower energy input, with much lower formation of chloro-organic byproducts and marginal formation of chlorite and chlorate.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Peng J
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong.
Yin R
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong.
Yang X
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.
Shang C
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong. Hong Kong Branch of Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong.

MeSH

ChlorineDisinfectionOxidation-ReductionPhotolysisUltraviolet RaysWaterWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

34978792

Citation

Peng, Jiadong, et al. "A Novel UVA/ClO2 Advanced Oxidation Process for the Degradation of Micropollutants in Water." Environmental Science & Technology, vol. 56, no. 2, 2022, pp. 1257-1266.
Peng J, Yin R, Yang X, et al. A Novel UVA/ClO2 Advanced Oxidation Process for the Degradation of Micropollutants in Water. Environ Sci Technol. 2022;56(2):1257-1266.
Peng, J., Yin, R., Yang, X., & Shang, C. (2022). A Novel UVA/ClO2 Advanced Oxidation Process for the Degradation of Micropollutants in Water. Environmental Science & Technology, 56(2), 1257-1266. https://doi.org/10.1021/acs.est.1c05133
Peng J, et al. A Novel UVA/ClO2 Advanced Oxidation Process for the Degradation of Micropollutants in Water. Environ Sci Technol. 2022 01 18;56(2):1257-1266. PubMed PMID: 34978792.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A Novel UVA/ClO2 Advanced Oxidation Process for the Degradation of Micropollutants in Water. AU - Peng,Jiadong, AU - Yin,Ran, AU - Yang,Xin, AU - Shang,Chii, Y1 - 2022/01/03/ PY - 2022/1/4/pubmed PY - 2022/4/1/medline PY - 2022/1/3/entrez KW - UV-LED KW - chlorine dioxide KW - disinfection byproducts KW - kinetic model KW - micropollutants SP - 1257 EP - 1266 JF - Environmental science & technology JO - Environ Sci Technol VL - 56 IS - 2 N2 - Ultraviolet (UV)-based advanced oxidation processes (AOPs) are increasingly used for the degradation of micropollutants in water and wastewater. This study reports a novel UVA/chlorine dioxide (ClO2) AOP based on the photolysis of ClO2 using energy-efficient UV radiation sources in the UVA range (e.g., UVA-LEDs). At a ClO2 dosage of 74 μM (5.0 mg L-1 as ClO2) and a UV fluence at 47.5 mJ cm-2, the UVA365/ClO2 AOP generated a spectrum of reactive species, including chlorine oxide radicals (ClO•), chlorine atoms (Cl•), hydroxyl radicals (HO•), and ozone at a concentration of ∼10-13, ∼10-15, ∼10-14, and ∼10-7 M, respectively. A kinetic model to simulate the reactive species generation in the UVA365/ClO2 AOP was established, validated against the experimental results, and used to predict the pseudo-first-order rate constants and relative contributions of different reactive species to the degradation of 19 micropollutants in the UVA365/ClO2 AOP. Compared to the well-documented UVC254/chlorine AOP, the UVA365/ClO2 AOP produced similar levels of reactive species at similar oxidant dosages but was much less pH-dependent and required much lower energy input, with much lower formation of chloro-organic byproducts and marginal formation of chlorite and chlorate. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/34978792/A_Novel_UVA/ClO2_Advanced_Oxidation_Process_for_the_Degradation_of_Micropollutants_in_Water_ DB - PRIME DP - Unbound Medicine ER -