[Studies on the degradation of paracetamol in sono-electrochemical oxidation].

A novel lead dioxide electrodes co-doped with rare earth and polytetrafluoroethylene(PTFE) were prepared by the electrode position method and applied as anodes in sono-electrochemical oxidation for pharmaceutical wastewater degradation.The results showed that the APAP removal and the mineralization efficiency reached an obvious increase,which meant that the catalytic efficiency showed a significant improvement in the use of rare-earth doped electrode.The effects of process factors showed that the condition of the electrode had the best degradation efficiency with doped with Ce2O3under electrolyte concentration of 14.2 g·L-1,49.58 W·cm-2,50 Hz,pH=3,71.43 mA·cm-2.The APAP of 500 mg·L-1 removal rate reached 92.20% and its COD and TOC values declined to 79.95% and 58.04%,the current efficiency reached 45.83% after degradation process for 2.0 h.The intermediates were monitored by the methods of GC-MS,HPLC,and IC.The main intermediates of APAP were p-benzoquinone,benzoic acid,acetic acid,maleic acid,oxalic acid,formic acid etc,and the final products were carbon dioxide and water.The goal of completely degradation of pollutant was achieved and a possible degradation way was proposed.