Degradation of tannic acid using monopersulfate activated CuO particles

Abstract

A Copper(II) oxide material was synthesized and its efficiency in degrading Tannic acid (TA) was investigated using ultraviolet (UV) irradiation and CuO activated peroxymonosulfate (PMS). The CuO particle catalyst exhibited exceptional activity and was characterized using XRD, SEM, Raman spectroscopy, and laser diffraction particle size analysis (LDPS). The influence of calcination temperature, UV power, PMS dosage, CuO dosage, and coexisting anions on the degradation rate of TA was examined. The research results demonstrate that the addition of a structural guide enhances the catalytic performance of CuO. Among the different calcination temperatures investigated, CuO calcined at 500 °C demonstrates the best catalytic performance and achieves the highest degradation efficiency under neutral conditions. Under the optimal conditions of 0.1 g/L CuO and 1.2 mmol/L PMS, the TA degradation rate of 15 mg/L within 40 min was 97.69%, and the total organic carbon removal rate was 69.85%. Quenching experiments confirmed the participation of multiple active species in the decomposition process. After five experimental cycles, the CuO material maintained a TA removal rate above 92%. Furthermore, HPLC-MS analysis was employed to identify potential intermediates in the degradation of TA.