Enhancement of electro-peroxone degradation of simazine by carbon nanotube electrodes
Conventional electrocatalytic technology is limited by the efficiency of in-situ electrogenerated H2O2 over the cathode,and poor degradability for some pollutants with specific structures.In order to increase the pollutant degradation performance and the stability of electrodes,a self-made anthraquinone-modified carbon nanotube(CNT/TBAQ)electrode was taken as the cathode,and an electro-peroxone reactor based on the submerged and aerated electrode was constructed,which performance on the degradation of simazine by the active substances in the electro-peroxone system was studied.The results showed that the HO·generation was 1.024 μmol·L-1 at the gas flow rate of 0.2 L·min-1 and the current density of 7.5 mA·cm-2.Compared with the technology of electrocatalysis or ozone alone,the electro-peroxone technology could completely remove simazine with an initial concentration of 5 mg·L-1 within 6 min.When the O3 concentration was 10 mg·L-1 and the current intensity was 7.5 mA.cm-2,the mineralization efficiency of electro-peroxone technology was the highest,with the TOC removal rate of 62.25％after 120 min,and the energy consumption was reduced by 55％and 31％compared with electro-catalytic oxidation and ozonation,respectively.However,the electro-peroxone technology did not significantly reduce the toxicity of simazine intermediates.The cathode of the CNT/TBAQ still retained the pollutant removal capacity after ten cycles of use.These results showed that electro-peroxone technology using CNT/TBAQ electrode as the cathode could effectively increase the pollutant degradation efficiency,and provide a promising technology for the removal of trace pollutants.
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