Degradation Mechanism of Electrocatalytic Oxidization Coupled with Ozonation for Pesticide Wastewater
Pesticide wastewater,a highly concentrated organic wastewater,is characterized by high chemical oxygen demand(COD),toxicity,complex pollutant composition,and poor biodegradability.If not effectively treated,the discharge of these chemicals into the environment can severely impact water quality,soil,and ultimately human health.Traditional treatment methods often struggle to efficiently process pesticide wastewater.In this study,an electrocatalytic coupled ozone(Bi2Mo3O12/Co3O4/O3)advanced oxidation process was developed,utilizing cobalt tetraoxide(Co3O4)as the anode and bismuth molybdate(Bi2Mo3O12)as the cathode.The process effectively treated pesticide wastewater under conditions of pH 6,ozone concentration of 28 mg/L,and current density of 30 mA/cm2.The mechanism of the coupled system was validated using atrazine(ATZ),a typical pollutant in pesticide wastewater,as a model compound.Quenching experiments indicated that hydroxyl radicals(·OH)are the active species in the Bi2Mo3O12/Co3O4/O3 system.Quantitative analysis showed that the highest·OH yield was 2.48 mmol/L in the Bi2Mo3O12/Co3O4/O3 system,while the H₂O₂ concentration(68.54 μmol/L)was lower than that in the Bi2Mo3O12/O3 system after 60 minutes.The anode and cathode in the Bi2Mo3O12/Co3O4/O3 system work synergistically to produce·OH.This study offers new insights into pesticide wastewater treatment methods and holds significant potential for practical engineering applications.
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