NTA-Fe@PDA/H2O2 oxidation for removal of oxytetracycline hydrochloride from wastewater
LIN Jia-wei1,2, SU Bing-qin1,2, LI Xing-fa1, WEI Yue-xing1, ZHENG Xiao-xiao1, ZHANG Xia-ling1, SONG Xin-tong1, ZHAO Wen-bo1,2
1. College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, China; 2. Shanxi Municipal Engineering Graduate Education Innovation Center, Jinzhong 030600, China
Abstract：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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