In this paper, biochar loaded with nano-ZnO (ZnO-BC) was prepared from water hyacinth. The degradation performance of tetracycline hydrochloride (TC) in two systems, one referred to UV/ ZnO-BC system and the other to UV/ ZnO-BC /sodium persulfate (PS), were comparatively studied. The results showed that the degradation efficiency of ZnO-BC / UV system alongside PS was significantly higher than that of ZnO-BC alone, and the efficiency reached 89.48% after 120min. PS could be used as a strong oxidant that could use photogenerated electrons of nano-ZnO to produce SO4-· and ·OH, achieving synergistic photocatalytic effects. The oxidation process of TC could be divided into two stages: dark adsorption and photocatalysis. The order of influence factors obtained by response surface methodology was PS concentration > UV power > initial pH value > nano-ZnO mass concentration. The quenching test suggested that SO4-· and ·OH were the main free radicals in the degradation of TC. One part of the oxidizing free radicals were generated in the solution, the others from some kind of oxygen-containing functional groups on the biochar surface and the excitation of nano-ZnO by UV. On this basis, the synergistic mechanism and principle of PS and ZnO-BC during TC degradation were discussed.
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