In this paper,polydopamine(PDA)grafted with nitrilotriacetic acid(NTA)and Fe3+were chelated to form Fenton catalyst.Advanced oxidation process of NTA-Fe@PDA activated H2O2 was used to remove oxytetracyclin hydrochloride(OTC)from wastewater.The material characterization analysis showed that NTA-Fe@PDA was a typical mesoporous structure,Fe successfully chelated with organic ligand,and the polymerization effect of PDA was good.The effects of H2O2 dosage,NTA-Fe@PDA dosage and initial pH value on the degradation of OTC were investigated.Experimental results indicated that the degradation rate of 20mg/L OTC reached 96.23％after reaction for 60min,under the conditions of 5mmol/L H2O2,200mg/L NTA-Fe@PDA and initial pH 4.85.Free radical quenching experiments confirmed that·OH was the main free radical for OTC degradation.The possible degradation path of OTC was inferred by LC-MS analysis.The degradation rate of OTC was still above 86.80％after NTA-Fe@PDA was reused for 8times.Fenton oxidation process of NTA-Fe@PDA provided a new idea and technical reference for the treatment of antibiotic wastewater.
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