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Effect of anions on the degradation of antibiotics by Mo2C/peroxonosulfate |
ZHOU Zhou, TANG Lei, ZHAO Xu-qiang, CHEN Xu-wen, WANG He-fei, GAO Yan-zheng |
Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China |
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Abstract The effects of typical inorganic anions SO42-, NO3-, Cl-, HCO3-, CO32- on oxidative degradation of chloramphenicol antibiotics by layered Mo2C activated peroxonosulfate (PMS) were investigated. The results showed that the degradation of three chloramphenicol antibiotics (chloramphenicol, thiamphenicol and flufenicol) was inhibited by the five inorganic anions, in which SO42- and NO3- mainly affected the reaction rate. Cl-, HCO3- and CO32- affected both the degradation percentage and the reaction rate. When the concentrations of Cl-, HCO3- and CO32- were 20mmol/L, the degradation percentage of chloramphenicol was decreased from 100% to 59.27%, 2.85% and 0%, respectively. The degradation percentage of thiamphenicol was decreased from 100% to 64.64%, 8.54% and 0%, respectively. And the degradation percentage of flufenicol was decreased from 100% to 33.23%, 1.38%, and 0%, respectively. Among them, CO32- had a strong inhibitory effect on antibiotics degradation, and the degradation of three chloramphenicol antibiotics was completely inhibited at the presence of 5mmol/L CO32-. The effects of five inorganic anions on the degradation of three chloramphenicol antibiotics showed the trend, as CO32-> HCO3- > Cl- > NO3- ≈ SO42-. In addition, there was a significant negative correlation between the degradation of the three antibiotics and Cl-, while there was also a significant negative correlation between the degradation of thiamphenicol, flufenicol and HCO3-. The results provided a reference for the practical application of advanced oxidation processes.
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Received: 30 August 2023
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Corresponding Authors:
陈旭文,助理研究员,chenxuwen@njau.edu.cn
E-mail: chenxuwen@njau.edu.cn
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