Aminocarboxylate chelated cobalt activates peroxymonosulfate to degrade tetracycline
In this study,a high-quality metal-based heterogeneous catalyst was synthesized using aminocarboxylate as a chelating agent.A composite catalyst(CSI-Co)was fabricated by chelating the metal cobalt with aminocarboxylate tetrasodium iminodisuccinate(IDS)and grafting it onto chitosan(CS)at room temperature and under acidic conditions(pH～6).The results of EDS,FT-IR and X-ray photoelectron spectroscopy(XPS)showed that CS and IDS were successfully grafted to form amide bonds and Co was also successfully chelated to the composite material.Tetracycline hydrochloride(TCH)was degraded by peroxymonosulfate(PMS)activated by CSI-Co.Under the conditions of 10mg/L TCH(initial pH～5.21),PMS dosage of 400mg/L,and CSI-Co dosage of 200mg/L,the degradation rate of TCH was 98.52％after 10min reaction,and the degradation rate was still 74.16％after repeated use for 4times.It also has good catalytic effect in a wide pH range(3～11)and in the presence of multiple anions(HCO3-,HPO42-,SO42-,Cl-and NO3-)and humic acid(HA),indicating its excellent catalytic performance.The active species in the reaction system were identified by free radical quenching and electron paramagnetic resonance(EPR)experiments.It was confirmed that the main active species in the degradation of TCH by PMS/CSI-Co system was singlet oxygen(1O2),and a small amount of sulfate radical(SO4·-)and hydroxyl radical(HO')were involved in the degradation.The results provide a new idea for the preparation of metal-based heterogeneous catalysts,indicating that the prepared CSI-Co has potential in persulfate catalytic reaction and antibiotic removal.
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