화학공학소재연구정보센터
Chemical Engineering Journal, Vol.354, 473-480, 2018
Enhanced superoxide radical production for ofloxacin removal via persulfate activation with Cu-Fe oxide
Cu-Fe composite oxides with different Cu:Fe ratios were synthesized by a hydrothermal method and investigated as a heterogeneous catalyst for persulfate activation. The obtained samples exhibited much higher activity than CuFe2O4 for the degradation and mineralization of ofloxacin with persulfate, and the optimized Cu: Fe ratio was 1:1 (CuFe1). The results of catalyst characterization and electron paramagnetic resonance analysis indicate that the activities of the catalysts for ofloxacin degradation and superoxide radical (center dot O-2(-)) production are highly positively correlated with their redox ability. The removal efficiencies of ofloxacin in the presence of different scavengers further demonstrate that center dot O-2(-) is the dominant reactive species in this process, which is quite different from previous studies. It is suggested that CuFe1 with higher oxidation ability could weaken the S-O bond of adsorbed persulfate, thus promoting the decomposition persulfate into center dot O-2(-). Finally, the possible degradation pathway of ofloxacin was proposed according to the liquid chromatography-mass spectrometry result.