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Visible-light-driven CQDs@MIL-125(Ti) nanocomposite photocatalyst with enhanced photocatalytic activity for the degradation of tetracycline

机译:可见光驱动的CQDS @ MIL-125(TI)纳米复合光催化剂,具有增强的光催化活性,用于降解四环素

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摘要

In the present study, a novel photocatalyst, CQDs@MIL-125(Ti) (CQDs = carbon quantum dots), was prepared via a solvothermal procedure. The photocatalytic properties were tested by the degradation of tetracycline (TC) with a 250 W Xe lamp (lambda > 420 nm). Compared with pure MIL-125(Ti), the 10 wt% CQDs@MIL-125(Ti) photocatalyst can significantly improve the degradation process of TC, and the degradation efficiency can reach 90% within 4 h. The enhancement in the photocatalytic performance is due to the CQDs, which can promote the absorption of visible light and also efficiently accelerate the separation of photogenerated electron-hole pairs. We have also demonstrated that superoxide radicals (.O-2(-)) and holes (h(+)) play crucial roles in the photocatalytic degradation of TC through capture experiments. The current work provides a new idea for constructing high-efficiency photocatalysts based on MIL-125(Ti).
机译:在本研究中,通过溶剂热程序制备新的光催化剂,CQDS @ MIL-125(TI)(CQDS =碳量子点)。 通过用250W XE灯(Lambda> 420nm)通过四环素(Tc)的降解来测试光催化性质。 与纯MIL-125(TI)相比,10wt%CQDS @ MIL-125(TI)光催化剂可以显着改善TC的降解过程,降解效率在4小时内可达到90%。 光催化性能的增强是由于CQDS,它可以促进可见光的吸收,并且还有效地加速光生电子孔对的分离。 我们还证明超氧化物自由基(.o-2( - ))和孔(H(+))通过捕获实验起到TC的光催化降解中的关键作用。 目前的工作为基于MIL-125(TI)构建高效光催化剂提供了新的思路。

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    《RSC Advances》 |2019年第57期|共8页
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  • 正文语种 eng
  • 中图分类 化学;
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