Kinetics Study on Efficient Removal of Tetracycline in Water by Iron Cathodic Activated Persulfate
Antibiotics are widely present in surface water and groundwater,posing a serious risk to aquatic environments and human health,and have become important new pollutants under international conventions.Advanced oxidation technologies are effective for treating refractory new pollutants.The electrochemical activation of persulfate-based advanced oxidation technology has received wide-spread attention in the treatment of antibiotics and other new pollutants,but traditional iron anode activation methods still suffer from high sludge production and other deficiencies.Therefore,this study developed an advanced oxidation technology based on the electro-chemical activation of peroxydisulfate(PDS)using an iron cathode,and investigated its degradation kinetics and mechanisms on tetra-cycline.The study established a multi-process coupled kinetic theoretical model for tetracycline degradation,and the simulation results were in good agreement with the experimental observations.The results indicated that the iron cathode system could effectively degrade tetracycline(0.42±0.007 38 M-1·s-1)and reduce electrode losses.Through the analysis of key factors,it was found that sulfate con-centration,current magnitude,initial pH value,and initial tetracycline concentration could all affect the degradation kinetics of tetracy-cline to varying degrees.Inspection of degradation mechanisms revealed that the main active oxygen species in the iron cathode system were SO4 and OH,contributing 28.02％and 71.98％,respectively,to the degradation of tetracycline.These findings provide im-portant support for the efficient treatment of antibiotic and other new pollutants using the iron cathode-persulfate technology.
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