Visible light selective photocatalytic conversion of glucose by TiO2
Visible light selective photocatalytic conversion of glucose by TiO2
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DOI：
10.1016/j.apcatb.2016.08.035
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发表时间：
2017-03-01
影响因子：
22.1
通讯作者：
Lopez-Sanchez, Jose A.
中科院分区：
文献类型：
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作者：
Da Via, Luigi;Recchi, Carlo;Lopez-Sanchez, Jose A.
首次报道了使用未改性的 TiO2 作为催化剂的可见光介导的葡萄糖选择性光氧化。探讨了可见光和 UVA 光下催化剂与基材的比例、灯功率和 TiO2 晶相对转化率和产物分布的影响。在 UVA 光下获得了较高的转化率，但这是通过非选择性途径进行大量矿化的结果。反应条件的优化导致可见光下葡萄糖转化率为 42%，对葡萄糖酸的选择性为 7%，对其他部分氧化产物的选择性为 93%，并完全抑制了 CO2 的矿化途径。还表明，在自然阳光照射下 7 小时后，可以发生选择性葡萄糖转化。在这项系统研究中，我们证明确实可以使用TiO2作为光催化剂，通过调整反应条件来选择性地升级生物质衍生物。最重要的是，我们在可见光照射下观察到的光活性中发现了由于葡萄糖吸附到 TiO2 决定簇表面而产生的配体到金属的电荷转移效应。了解这种效应以及对反应条件的仔细控制意味着在可见光下选择性光催化转化其他生物质衍生的碳水化合物是生产更高价值化学品的可行途径。 (C) 2016 作者。由 Elsevier B.V. 出版
The visible-light mediated selective photo-oxidation of glucose using unmodified TiO2 as a catalyst is reported for the first time. The effect of the catalyst to substrate ratio, lamp power and TiO2 crystalline phases on the conversion and product distribution under both visible and UVA light is explored. Higher conversions were obtained under UVA light but as a result of substantial mineralization through an unselective pathway. Optimization of the reaction conditions resulted in 42% glucose conversion under visible light with 7% selectivity to gluconic acid and 93% selectivity to other partial oxidation products with the total suppression of a mineralization pathway to CO2. It is also shown that selective glucose conversion can occur under natural sunlight light after 7 h exposure. In this systematic study, we prove that it is indeed possible to use TiO2 as a photocatalyst to upgrade biomass derivatives selectively by tailoring the reaction conditions. Most importantly, we find the ligand-to-metal charge-transfer effect as a result of glucose adsorption to the surface of TiO2 determinant in the photo-activity observed under visible light irradiation. Knowledge of this effect along with the careful control of reaction conditions means that the selective photo-catalytic conversion of other biomass derived carbohydrates under visible light is a viable route to higher value chemicals. (C) 2016 The Author(s). Published by Elsevier B.V.