Effect of anions on the degradation of antibiotics by Mo2C/peroxonosulfate
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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