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首页> 外文期刊>Journal of Hazardous Materials >Oxygen vacancy boosted photocatalytic decomposition of ciprofloxacin over Bi_2MoO_6: Oxygen vacancy engineering, biotoxicity evaluation and mechanism study
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Oxygen vacancy boosted photocatalytic decomposition of ciprofloxacin over Bi_2MoO_6: Oxygen vacancy engineering, biotoxicity evaluation and mechanism study

机译：氧空位促进Bi_2MoO_6上环丙沙星的光催化分解：氧空位工程，生物毒性评价和机理研究

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Herein, efficient visible light driven photocatalytic degradation of ciprofloxacin was realized over Bi2MoO6 with oxygen vacancies (OVs) which can be tunably introduced through a facile solvothermal method via the modulation of tetramethylethylenediamine (TMEDA). The optimal Bi2MoO6 with OVs possessed the highest CIP degradation rate of 1.799 mg min(-1) m(-1), about 8.4 times than that of the pristine Bi2MoO6. And more than half of CIP was mineralized in only 2 h. The biotoxicity of ciprofloxacin and its byproducts to E. coli K-12 and saccharomyces cerevisiae was thoroughly eliminated after 6 h's photocatalytic treatment. Characterization methods revealed the rich oxygen vacancies in Bi2MoO6 not only endowed it with broader visible light absorption and faster transfer of photogenerated carriers, but also provided abundant absorption sites of surface oxygen for efficient molecular oxygen activation. Correspondingly, plentiful active species were produced and participated in the photocatalytic process, thereby efficiently promoting the ciprofloxacin degradation. Based on the HPLC-MS analysis, a possible decomposition pathway of CIP was finally proposed with the first decomposition step of pipetazine ring oxidation and breakage. This work might open up new avenues for superior visible light driven photocatalysts design to deal with pharmaceutical compounds contamination via tunable OVs Engineering.
机译：在此，在具有氧空位（OVs）的Bi 2 MoO 6上实现了有效的可见光驱动的环丙沙星的光催化降解，可以通过调节四甲基乙二胺（TMEDA）的简便溶剂热法将其引入。具有OV的最佳Bi2MoO6具有最高的CIP降解速率，为1.799 mg min（-1）m（-1），约为原始Bi2MoO6的8.4倍。而且仅在2小时内就有超过一半的CIP矿化。经过6 h的光催化处理，环丙沙星及其副产物对大肠杆菌K-12和酿酒酵母的生物毒性被彻底消除。表征方法表明，Bi2MoO6中丰富的氧空位不仅使其具有更宽的可见光吸收能力和光生载流子的更快转移，而且还为有效的分子氧活化提供了丰富的表面氧吸收位点。相应地，产生了大量的活性物种并参与了光催化过程，从而有效地促进了环丙沙星的降解。在HPLC-MS分析的基础上，通过哌嗪环氧化和断裂的第一步，最终提出了CIP可能的分解途径。这项工作可能会为通过可见的OVs工程技术处理药物化合物污染的出色可见光驱动光催化剂设计开辟新途径。

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