Tags

Type your tag names separated by a space and hit enter

Reducing properties of triplet state organic matter (3DOM*) probed via the transformation from chlorine dioxide to chlorite.
Water Res. 2022 Oct 15; 225:119120.WR

Abstract

The triplet states of dissolved organic matter (3DOM*) have been well known to oxidize various organic contaminants, but evidence of their reducing properties are largely scarce. In this work, chlorine dioxide (ClO2) as a single-electron oxidant was used as a probe to evaluate the reduction property of 3DOM*. The reduction of ClO2 to chlorite was observed in the solutions of model photosensitizers (i.e., 4-carboxybenzophenone, benzophenone, acetophenone, 3-methoxyacetophenone, naphthalene, and xanthone) during UV irradiation with the presence of ClO2, though they are resistant to ClO2 oxidation in the dark. The reducing property of the triplet states of photosensitizers was verified and their second-order reaction rate constants with ClO2 were determined to be in the range of 1.45(± 0.03)× 109 - 2.18(± 0.06) × 109 M-1 s-1 at pH 7.0. The quenching tests excluded the role of other reactive species (e.g., HO•, O(3P), Cl•, ClO• and HOCl/OCl-, O2•- and eaq-) in ClO2 reduction to chlorite when using model photosensitizers and DOM isolates. Chlorite formation was 48.1-90.4% and 4812.8-7721.8% higher during UV irradiation with the presence of ClO2 and DOM than those without UV irradiation or without DOM present, respectively. The enhancement was attributed to the enhanced electron donating capacity (chlorite precursors) of DOM upon UV irradiation and also to 3DOM* acting as an electron donor reducing ClO2 to chlorite. This study highlighted the important role of 3DOM* as a reductant.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.

School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.

School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.

School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.

School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.

School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.

School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.

Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999066, China.

Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999066, China.

School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China. Electronic address: yangx36@mail.sysu.edu.cn.

MeSH

Photosensitizing AgentsReducing AgentsChlorine CompoundsOxidesOxidation-ReductionOxidantsBenzophenonesNaphthalenesAcetophenonesXanthonesChlorineWater Purification

Pub Type(s)

Journal Article

Language

eng

PubMed ID

36126426

Citation

Kong, Qingqing, et al. "Reducing Properties of Triplet State Organic Matter (3DOM*) Probed Via the Transformation From Chlorine Dioxide to Chlorite." Water Research, vol. 225, 2022, p. 119120.

Kong Q, Pan Y, Lei X, et al. Reducing properties of triplet state organic matter (3DOM*) probed via the transformation from chlorine dioxide to chlorite. Water Res. 2022;225:119120.

Kong, Q., Pan, Y., Lei, X., Zhou, Y., Lei, Y., Peng, J., Zhang, X., Yin, R., Shang, C., & Yang, X. (2022). Reducing properties of triplet state organic matter (3DOM*) probed via the transformation from chlorine dioxide to chlorite. Water Research, 225, 119120. https://doi.org/10.1016/j.watres.2022.119120

Kong Q, et al. Reducing Properties of Triplet State Organic Matter (3DOM*) Probed Via the Transformation From Chlorine Dioxide to Chlorite. Water Res. 2022 Oct 15;225:119120. PubMed PMID: 36126426.

* Article titles in AMA citation format should be in sentence-case

TY - JOUR T1 - Reducing properties of triplet state organic matter (3DOM*) probed via the transformation from chlorine dioxide to chlorite. AU - Kong,Qingqing, AU - Pan,Yanheng, AU - Lei,Xin, AU - Zhou,Yangjian, AU - Lei,Yu, AU - Peng,Jianglin, AU - Zhang,Xinran, AU - Yin,Ran, AU - Shang,Chii, AU - Yang,Xin, Y1 - 2022/09/14/ PY - 2022/05/07/received PY - 2022/08/08/revised PY - 2022/09/13/accepted PY - 2022/9/21/pubmed PY - 2022/10/21/medline PY - 2022/9/20/entrez KW - Chlorine dioxide KW - Chlorite KW - Dissolved organic matter (DOM) KW - Triplet state KW - UV irradiation KW - Water treatment SP - 119120 EP - 119120 JF - Water research JO - Water Res VL - 225 N2 - The triplet states of dissolved organic matter (3DOM*) have been well known to oxidize various organic contaminants, but evidence of their reducing properties are largely scarce. In this work, chlorine dioxide (ClO2) as a single-electron oxidant was used as a probe to evaluate the reduction property of 3DOM*. The reduction of ClO2 to chlorite was observed in the solutions of model photosensitizers (i.e., 4-carboxybenzophenone, benzophenone, acetophenone, 3-methoxyacetophenone, naphthalene, and xanthone) during UV irradiation with the presence of ClO2, though they are resistant to ClO2 oxidation in the dark. The reducing property of the triplet states of photosensitizers was verified and their second-order reaction rate constants with ClO2 were determined to be in the range of 1.45(± 0.03)× 109 - 2.18(± 0.06) × 109 M-1 s-1 at pH 7.0. The quenching tests excluded the role of other reactive species (e.g., HO•, O(3P), Cl•, ClO• and HOCl/OCl-, O2•- and eaq-) in ClO2 reduction to chlorite when using model photosensitizers and DOM isolates. Chlorite formation was 48.1-90.4% and 4812.8-7721.8% higher during UV irradiation with the presence of ClO2 and DOM than those without UV irradiation or without DOM present, respectively. The enhancement was attributed to the enhanced electron donating capacity (chlorite precursors) of DOM upon UV irradiation and also to 3DOM* acting as an electron donor reducing ClO2 to chlorite. This study highlighted the important role of 3DOM* as a reductant. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/36126426/Reducing_properties_of_triplet_state_organic_matter__3DOM___probed_via_the_transformation_from_chlorine_dioxide_to_chlorite_ DB - PRIME DP - Unbound Medicine ER -