Oxygen vacancy boosted photocatalytic decomposition of ciprofloxacin over Bi2MoO6: Oxygen vacancy engineering, biotoxicity evaluation and mechanism study
Oxygen vacancy boosted photocatalytic decomposition of ciprofloxacin over Bi2MoO6: Oxygen vacancy engineering, biotoxicity evaluation and mechanism study
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氧空位促进Bi2MoO6光催化分解环丙沙星：氧空位工程、生物毒性评价和机制研究
DOI：
10.1016/j.jhazmat.2018.10.063
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发表时间：
2019
影响因子：
13.6
通讯作者：
Chen Hao
中科院分区：
文献类型：
--
作者：
Xu Xiao;Ding Xing;Yang Xianglong;Wang Pei;Li Shu;Lu Zhexue;Chen Hao
本研究利用氧空位（OVs）在bi2moo6上实现了环丙沙星的高效可见光驱动光催化降解，氧空位（OVs）可以通过简单的溶剂热方法通过四亚甲基乙二胺（TMEDA）的调制来调节。添加OVs的最佳Bi2MoO6的CIP降解率最高，为1.799 mg min - 1m−1，约为原始Bi2MoO6的8.4倍。超过一半的CIP在2小时内被矿化。经6 h光催化处理后，环丙沙星及其副产物对大肠杆菌K-12和酿酒酵母菌的生物毒性完全消除。表征方法表明，bi2moo6中丰富的氧空位不仅使其具有更广泛的可见光吸收和光生载流子的更快转移，而且为高效的分子氧活化提供了丰富的表面氧吸收位点。相应的，产生了大量的活性物质并参与光催化过程，从而有效地促进了环丙沙星的降解。基于HPLC-MS分析，最终提出了CIP的一种可能的分解途径，即以哌嗪环氧化破碎为第一分解步骤。这项工作可能为通过可调OVs工程设计高性能可见光驱动光催化剂来处理药物化合物污染开辟了新的途径。
Herein, efficient visible light driven photocatalytic degradation of ciprofloxacin was realized over Bi2MoO6with oxygen vacancies (OVs) which can be tunably introduced through a facile solvothermal method via the modulation of tetramethylethylenediamine (TMEDA). The optimal Bi2MoO6with OVs possessed the highest CIP degradation rate of 1.799 mg min−1m−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 Bi2MoO6not 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.