Facile one-pot fabrication of ZnO2 particles for the efficient Fenton-like degradation of tetracycline

This work presented a facile one-pot fabrication of zinc peroxide (ZnO2) particles for Fenton-like degradation of tetracycline (TC). The effects of precipitants and their addition sequences on the synthesis of ZnO2 were first investigated in detail. Phase-pure ZnO2 could be obtained when H2O2 was added before adding precipitant (NH3 center dot H2O/NaOH) or after NH3 center dot H2O precipitation. The Fenton-like degradation performance of ZnO2 was evaluated using 100 mL of TC solution (50 mg/L). It was found that 10 mg of ZnO2 could degrade about 90% of TC within 1 h in the presence of 3 mg of Fe-2(SO4)3 center dot xH(2)O at ambient temperature. Besides, increasing ZnO2 dosage, Fe-2(SO4)3 center dot xH(2)O dosage and temperature were all beneficial to TC degradation, and the degradation process could be well described by the pseudo-second order kinetic model. The catalytic degradation process could be efficiently conducted in a wide pH range of 4 -8, while the coexisted PO43- and HCO3- were unfavorable for TC degradation. Furthermore, radical quenching experiments and electron spin resonance tests indicated that hydroxyl radical was the dominant reactive oxygen species generated in the degradation system. (C) 2020 Elsevier B.V. All rights reserved.