Efficiency and mechanism of degradation of acetaminophen in UV222/PDS system
The degradation efficiency of non steroidal anti-inflammatory drug acetaminophen(ACT)was investigated using UV222/persulfate(PDS)as the research system.The effects of PDS concentration,pH,natural organic matter(NOM),and anions(Cl-,HCO3-/CO32-)on the degra-dation efficiency of ACT were studied.The experimental results indicate that the stability of ACT is strong in the UV222 or PDS system alone,while in the UV222/PDS system,the degradation effi-ciency of ACT is significantly increased due to the catalytic production of active substances(such as HO·、SO4·-、1O2、O2·-).Increasing the dosage of oxidants or increasing the pH of the solution in the system can both improve the degradation rate of ACT.NOM has a strong shading effect on UV222,resulting in a more significant inhibitory effect on the degradation of ACT by UV222/PDS.The degradation effect of Cl-on ACT in water shows a first inhibitory and then promoting effect with increasing concentration;HCO3-/CO32-can significantly promote the degradation of ACT.Furthermore,it is worth noting that acute toxicity studies have shown that the organic products generated during the degradation of ACT in the UV222/PDS system have certain biological toxicity.
万方数据
