Kinetics and modeling of degradation of ionophore antibiotics by UV and UV/H2O2

Environmental Science & Technology
Hong YaoChing-Hua Huang

Abstract

Ionophore antibiotics (IPAs), one of the major groups of pharmaceuticals used in livestock industry, have been found to contaminate agricultural runoff and surface waters via land application of animal manures as fertilizers. However, limited research has investigated the means to remove IPAs from water sources. This study investigates the degradation of IPAs by using ultraviolet (UV) photolysis and UV combined with hydrogen peroxide (UV/H2O2) advanced oxidation process (AOP) under low-pressure (LP) UV lamps in various water matrices. Three widely used (monensin, salinomycin, and narasin) and one model (nigericin) IPAs exhibit low light absorption in the UV range and degrade slowly at the light intensity of 3.36 × 10(-6) Einstein·L(-1)·s(-1) under UV photolysis conditions. However, IPAs react with hydroxyl radicals produced by UV/H2O2 at fast reaction rates, with second-order reaction rate constants at (3.49-4.00) × 10(9) M(-1)·s(-1). Water matrix constituents enhanced the removal of IPAs by UV photolysis but inhibited UV/H2O2 process. A steady-state kinetic model successfully predicts the impact of water constituents on IPA degradation by UV/H2O2 and determines the optimal H2O2 dose by considering both energy consumption and I...Continue Reading

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Citations

Oct 25, 2014·Environmental Science & Technology·Peizhe SunChing-Hua Huang
Feb 13, 2018·Journal of Experimental & Clinical Cancer Research : CR·Jiang JiangZeyao Tang
Jul 1, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Mingguo PengDongdong Li
Jun 27, 2019·Environmental Science and Pollution Research International·Xiang TuYonghui Song
Mar 27, 2018·Environmental Science and Pollution Research International·Linke GeZiwei Yao
May 24, 2019·International Journal of Environmental Research and Public Health·Guangcan ZhuQi Xue
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Apr 17, 2021·Journal of Colloid and Interface Science·Manoj P RayarothYoon-Seok Chang
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Jan 28, 2015·Environmental Science & Technology·Ruochun ZhangChing-Hua Huang
Feb 23, 2022·Environmental Science and Pollution Research International·Tahereh Jasemizad, Lokesh P Padhye

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