Photocatalytic oxidation of gas-phase Hg-0 by carbon spheres supported visible-light-driven CuO-TiO2
Photocatalytic oxidation of gas-phase Hg-0 by carbon spheres supported visible-light-driven CuO-TiO2
复制标题
可见光驱动的 CuO-TiO2 碳球光催化氧化气相 Hg-0
DOI：
10.1016/j.jiec.2016.11.012
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发表时间：
2017
影响因子：
6.1
通讯作者：
Zhang Wenbo
中科院分区：
文献类型：
--
作者：
Wu Jiang;Li Chaoen;Chen Xiantuo;Zhang Jing;Zhao Lili;Huang Tianfang;Hu Tao;Zhang Chong;Ni Bu;Zhou Xiao;Liang Pankun;Zhang Wenbo
提出了一种制备CuO/TiO2@C的简化方法。本研究制备了低成本的CuO/TiO2@C光催化剂(负载量为0.25-2wt.%)，并对其进行了表征和气相HgO氧化性能的评价。将所制得的CuO/TiO2C光催化剂分别在紫外光和发光二极管的作用下对气态单质汞进行了脱除，并确定了最佳的掺杂量。结果表明，CuO/TiO2C光催化剂对Hg0的氧化效率很高，当CsS掺杂量达到0.5wt.%时，光催化剂对Hg0的氧化效率达到%以上。我们提出了CuO/TiO2C光催化剂去除气态单质汞的可能机理：通过掺杂Css，Css可以作为敏化剂，将电子转移到半导体上，引发非常活性的自由基的形成，从而提高光催化效率。
A simplified approach for the fabrication of CuO/TiO2@C is demonstrated. In this study, low cost CuO/TiO2@C photocatalysts (CSs loading 0.25–2 wt.%) were prepared, characterized and evaluated for gas-phase Hg0oxidation. The obtained CuO/TiO2@C photocatalysts were used to remove gaseous elemental mercury under UV light and LED respectively, and the optimum doping of content of CSs was determined. The results showed that the CuO/TiO2@C photocatalysts were highly efficient in oxidizing Hg0, reaching above 64% when the CSs doping reached 0.5 wt.%. We have proposed that the probable mechanism by which CuO/TiO2@C photocatalysts remove gaseous elemental mercury: with CSs doping, CSs can act as sensitizer and transfer electrons to the semiconductors, triggering the formation of very reactive radicals to improve photocatalytic efficiency.