Enhanced superoxide radical production for ofloxacin removal via persulfate activation with Cu-Fe oxide

被引：173

作者：

Wang, Qing ^{[1
]}

Wang, Beibei ^{[1
]}

Ma, Yuan ^{[1
]}

Xing, Shengtao ^{[1
]}

机构：

[1] Hebei Normal Univ, Natl Demonstrat Ctr Expt Chem Educ, Coll Chem & Mat Sci, Shijiazhuang 050024, Hebei, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2018年 / 354卷

关键词：

Persulfate; Fe-Cu oxide; Ofloxacin; Degradation; Activation mechanism; MONOPERSULFATE OXIDATION; DEGRADATION; TETRACYCLINE; FENTON; COPPER; SULFATE; PEROXYMONOSULFATE; ADSORPTION; MECHANISM; CATALYST;

D O I：

10.1016/j.cej.2018.08.055

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

引用

页码：473 / 480

页数：8

共 51 条

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