Preparation of metal chelated Fenton-like catalysts used for tetracycline degradation
A solid-phase iron-based chelating Fenton-like catalyst was synthesized by grafting the chelating ligand amino carboxylic acid onto dopamine,followed by chelation with a metal.Experimental studies using H2O2 as the oxidant for the catalytic degradation of antibiotics revealed that the system could effectively remove tetracycline,achieving over 87％removal within a pH range of 3 to 10,with a maximum efficiency of 95.02％.The system maintained an impressive removal efficiency of 86.47％for tetracycline even after seven rounds of reuse.Despite the presence of anions such as Cl-,NO3-,HCO3-,SO42-,and HPO42-,and in various water matrices including ultrapure water,tap water,river water,and lake water,the catalytic degradation system consistently delivered favourable outcomes.Liquid chromatography-mass spectrometry(LC-MS)and biological toxicity assessments disclosed that the degradation of tetracycline occurred through three distinct pathways,where the toxicity of the intermediate products initially increased before decreasing to nontoxic and harmless levels.This catalyst preparation strategy was further extended to develop cobalt-based catalysts,which exhibited a remarkable 98.52％removal efficiency for tetracycline within a 10minute reaction period when using peroxymonosulfate(PMS)as the oxidant.
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