Department of Chemistry, Technical University Berlin, Straße des 17. Juni 124, 10623, Berlin, Germany.
Institute of Environmetal Technology, VŠB-Technical University of Ostrava, 17. listopadu 15, Ostrava, Poruba, Czech Republic.
Environ Sci Pollut Res Int. 2018 Dec;25(35):34903-34911. doi: 10.1007/s11356-017-0944-8. Epub 2017 Dec 28.
The photocatalytic reduction of CO with HO was investigated using Cu/TiO photocatalysts in aqueous solution. For this purpose, Cu/TiO photocatalysts (with 0.2, 0.9, 2, 4, and 6 wt.% of Cu) have been synthesized via sol-gel method. The photocatalysts were extensively characterized by means of inductively coupled plasma optical emission spectrometry (ICP-OES), N physisorption (BET), XRD, UV-vis DRS, FT-IR, Raman spectroscopy, TEM-EDX, and photoelectrochemical measurements. The as-prepared photocatalysts contain anatase as a major crystalline phase with a crystallite size around 13 nm. By increasing the amount of Cu, specific surface area and band gap energy decreased in addition to the formation of large agglomeration of CuO. Results revealed that the photocatalytic reduction of CO decreased in the presence of Cu/TiO in comparison to pure TiO, which might be associated to the formation of CuO phase acting as a recombination center of generated electron-hole pair. Decreasing of photoactivity can also be connected with a very low position of conduction band of photocatalysts with high Cu content, which makes H production necessary for CO reduction more difficult.
采用溶胶-凝胶法制备了铜负载二氧化钛（Cu/TiO）光催化剂（Cu 负载量分别为 0.2、0.9、2、4 和 6wt.%），并将其用于水相体系中 CO 与 HO 的光催化还原反应。采用电感耦合等离子体发射光谱仪（ICP-OES）、N 物理吸附（BET）、XRD、紫外-可见漫反射光谱（UV-vis DRS）、傅里叶变换红外光谱（FT-IR）、拉曼光谱、透射电子显微镜-能谱仪（TEM-EDX）和光电化学测试等手段对催化剂进行了广泛的表征。结果表明，与纯 TiO 相比，Cu/TiO 光催化还原 CO 的活性降低，这可能与生成的 CuO 相作为电子-空穴对的复合中心有关。高 Cu 负载量的光催化剂由于导带位置较低，导致光催化活性降低，这使得 CO 还原所需的 H 生成变得更加困难。此外，随着 Cu 含量的增加，催化剂的比表面积和带隙能减小，同时还会形成较大的 CuO 团聚体。
