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Metronidazole Degradation by UV and UV/H 2 O 2 Advanced Oxidation Processes: Kinetics, Mechanisms, and Effects of Natural Water Matrices

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  • Rongkui Su

    (PowerChina Zhongnan Engineering Corporation Limited, Changsha 410004, China
    Hunan First Normal University, Changsha 410114, China
    College of Environmental Science and Engineering, Central South University of Forestry & Technology, Changsha 410004, China
    These authors contributed equally to this work.)

  • Xiangrong Dai

    (PowerChina Zhongnan Engineering Corporation Limited, Changsha 410004, China
    These authors contributed equally to this work.)

  • Hanqing Wang

    (College of Environmental Science and Engineering, Central South University of Forestry & Technology, Changsha 410004, China)

  • Zhixiang Wang

    (College of Environmental Science and Engineering, Central South University of Forestry & Technology, Changsha 410004, China)

  • Zishi Li

    (College of Environmental Science and Engineering, Central South University of Forestry & Technology, Changsha 410004, China)

  • Yonghua Chen

    (College of Environmental Science and Engineering, Central South University of Forestry & Technology, Changsha 410004, China)

  • Yiting Luo

    (Hunan First Normal University, Changsha 410114, China)

  • Danxia Ouyang

    (College of Environmental Science and Engineering, Central South University of Forestry & Technology, Changsha 410004, China)

Abstract

Advanced oxidation technology represented by hydroxyl radicals has great potential to remove residual antibiotics. In this study, we systematically compared the metronidazole (MTZ) degradation behavior and mechanism in the UV and UV/H 2 O 2 systems at pH 3.00 condition. The results show that the initial reaction rates were 0.147 and 1.47 µM min −1 in the UV and UV/H 2 O 2 systems, respectively. The main reason for the slow direct photolysis of MTZ is the relatively low molar absorption coefficient (2645.44 M −1 cm −1 ) and quantum yield (5.9 × 10 −3 mol Einstein −1 ). Then, we measured k MTZ , OH • as 2.79 (±0.12) × 10 9 M −1 s −1 by competitive kinetics, and calculated k MTZ , OH • and [ OH • ] SS as 2.43 (±0.11) × 10 9 M −1 s −1 and 2.36 × 10 −13 M by establishing a kinetic model based on the steady-state hypothesis in our UV/H 2 O 2 system. The contribution of direct photolysis and • OH to the MTZ degradation was 9.9% and 90.1%. • OH plays a major role in the MTZ degradation, and • OH was the main active material in the UV/H 2 O 2 system. This result was also confirmed by MTZ degradation and radicals’ identification experiments. MTZ degradation increases with H 2 O 2 dosage, but excessive H 2 O 2 had the opposite effect. A complex matrix has influence on MTZ degradation. Organic matter could inhibit the degradation of MTZ, and the quenching of the radical was the main reason. NO 3 − promoted the MTZ degradation, while SO 4 2 − and Cl − had no effect. These results are of fundamental and practical importance in understanding the MTZ degradation, and to help select preferred processes for the optimal removal of antibiotics in natural water bodies, such as rivers, lakes, and groundwater

Suggested Citation

  • Rongkui Su & Xiangrong Dai & Hanqing Wang & Zhixiang Wang & Zishi Li & Yonghua Chen & Yiting Luo & Danxia Ouyang, 2022. "Metronidazole Degradation by UV and UV/H 2 O 2 Advanced Oxidation Processes: Kinetics, Mechanisms, and Effects of Natural Water Matrices," IJERPH, MDPI, vol. 19(19), pages 1-19, September.
  • Handle: RePEc:gam:jijerp:v:19:y:2022:i:19:p:12354-:d:928059
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    References listed on IDEAS

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    1. Rongkui Su & Hongguo Zhang & Feng Chen & Zhenxing Wang & Lei Huang, 2022. "Applications of Single Atom Catalysts for Environmental Management," IJERPH, MDPI, vol. 19(18), pages 1-6, September.
    2. Rongkui Su & Qiqi Ou & Hanqing Wang & Yiting Luo & Xiangrong Dai & Yangyang Wang & Yonghua Chen & Lei Shi, 2022. "Comparison of Phytoremediation Potential of Nerium indicum with Inorganic Modifier Calcium Carbonate and Organic Modifier Mushroom Residue to Lead–Zinc Tailings," IJERPH, MDPI, vol. 19(16), pages 1-15, August.
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    Cited by:

    1. Qianrong Jiang & Honglei Chen & Zeding Fu & Xiaohua Fu & Jiacheng Wang & Yingqi Liang & Hailong Yin & Junbo Yang & Jie Jiang & Xinxin Yang & He Wang & Zhiming Liu & Rongkui Su, 2022. "Current Progress, Challenges and Perspectives in the Microalgal-Bacterial Aerobic Granular Sludge Process: A Review," IJERPH, MDPI, vol. 19(21), pages 1-19, October.
    2. Rongkui Su & Yangyang Wang & Shunhong Huang & Runhua Chen & Jun Wang, 2022. "Application for Ecological Restoration of Contaminated Soil: Phytoremediation," IJERPH, MDPI, vol. 19(20), pages 1-6, October.

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