过硫酸盐
化学
催化作用
氧氟沙星
矿化(土壤科学)
分解
核化学
无机化学
降级(电信)
氧化还原
羟基自由基
过氧化氢
激进的
超氧化物
水溶液
氧气
光化学
作者
Qing Wang,Beibei Wang,Yuan Ma,Shengtao Xing
标识
DOI:10.1016/j.cej.2018.08.055
摘要
Abstract 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 ( O2−) production are highly positively correlated with their redox ability. The removal efficiencies of ofloxacin in the presence of different scavengers further demonstrate that O2− 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 O2−. Finally, the possible degradation pathway of ofloxacin was proposed according to the liquid chromatography−mass spectrometry result.
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