Escamilla Juan Carlos, Hidalgo-Carrillo Jesús, Martín-Gómez Juan, Estévez-Toledano Rafael C, Montes Vicente, Cosano Daniel, Urbano Francisco J, Marinas Alberto
Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, E-14071 Córdoba, Spain.
Department of Chemical Engineering and Physical Chemistry, Faculty of Science University Institute of Water, Climate Change and Sustainability (IACYS), University of Extremadura, 06006 Badajoz, Spain.
Materials (Basel). 2020 Aug 28;13(17):3800. doi: 10.3390/ma13173800.
This article explores the effect of the synthetic method of titanium dioxide (TiO)/C composites (physical mixture and the water-assisted/unassisted sol-gel method) on their photocatalytic activity for hydrogen production through glycerol photoreforming. The article demonstrates that, apart from a high surface area of carbon and the previous activation of its surface to favor titania incorporation, the appropriate control of titania formation is crucial. In this sense, even though the amount of incorporated titania was limited by the saturation of carbon surface groups (in our case, ca. 10 wt.% TiO), the sol-gel process without water addition seemed to be the best method, ensuring the formation of small homogeneously-distributed anatase crystals on mesoporous carbon. In this way, a ca. 110-fold increase in catalyst activity compared to Evonik P25 (expressed as hydrogen micromole per grams of titania) was achieved.
本文探讨了二氧化钛（TiO）/C复合材料的合成方法（物理混合物以及水辅助/非水辅助溶胶-凝胶法）对其通过甘油光催化重整产氢的光催化活性的影响。文章表明，除了碳具有高比表面积以及其表面预先活化有利于二氧化钛掺入外，对二氧化钛形成的适当控制至关重要。从这个意义上说，尽管由于碳表面基团的饱和，掺入的二氧化钛量有限（在我们的案例中，约10 wt.% TiO），但不加水的溶胶-凝胶法似乎是最佳方法，可确保在介孔碳上形成均匀分布的小锐钛矿晶体。通过这种方式，与赢创P25相比，催化剂活性提高了约110倍（以每克二氧化钛产生的氢微摩尔数表示）。
