摘要：An easily recyclable composite NGO-Fe3〇4 was synthesized, characterized, and evaluated as a heterogeneous catalyst for activation o f peroxydisulfate (PDS). In this study, a novel UV-enhanced heterogeneous NGO-Fe3〇4/peroxydisulfate(UV/NGO-Fe3〇4/PDS) system was developed and investigated for the degradation o f an antibiotic sulfadiazine (SDZ). 99.1 % SDZ could be removed w ithin 30 min in UV/NGO-Fe3〇4/PDS, while for UV/NGO-Fe3〇4, NGO-Fe3〇4/PDS and UV/PDS system it was 57.7 %, 43.2 % and 49.1 %, respectively. Better synergetic effect between U V irradiation and NGO-Fe3〇4/PDS system was observed. The SDZ degradation in the UV/NGO-Fe3OVPDS system could be applied by the first-order kinetic w ith a ^obs(SDZ) value o f 0.148 m in 1. Affecting factors such as in itia l pH, dosage ratio o f [NGO-Fe3O4]: [PDS] and in itia l concentration o f SDZ were further studied. Scavenging tests by tert-butyl alcohol and methanol confirmed that both hydroxyl radicals ( OH) and sulfate radicals (SO4') are responsible for the degradation o f SDZ, w ith the latter playing a more significant role. Finally, Five possible degradation pathways o f SDZ by UV/NGO-Fe3O4/PDS were proposed based on theoretical reactive sites attacked by radicals and intermediate products.
