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Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid-TiO2 composites

机译：杂多酸-TiO2复合材料水悬浮液中葡萄糖的光催化转化

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摘要

Commercial and home prepared TiO2 samples were functionalized with a commercial Keggin heteropolyacid (HPA) H3PW12O40 (PW12) or with a hydrothermally home prepared K7PW11O39 salt (PW11). All the materials were characterized by specific surface area measurements (BET), XRD analyses, Raman, DRS along with SEM observations and they have been used for glucose photocatalytic conversion in an aqueous suspension. Different reaction extents and distribution of intermediate oxidation products were observed depending on the photocatalyst. Gluconic acid, arabinose, erythrose and formic acid were observed as oxidation products when bare TiO2 or HPA/TiO2 composite materials were used. Glucose isomerization to form fructose was also observed and in some runs traces of glucaric acid and glyceraldehyde were also found. The carbon mass balance was accomplished in the presence of the commercial Evonik P25 TiO2 powder and the composites where TiO2 was present, whereas the presence of the solvothermically prepared TiO2 gave rise to a carbon unbalance, due to strong adsorption of the products on the photocatalyst surface. No reactivity was observed in the presence of PW12 alone while PW11 induced only isomerization of the glucose.
机译：使用商用Keggin杂多酸（HPA）H3PW12O40（PW12）或使用水热自制K7PW11O39盐（PW11）对商用和自制TiO2样品进行功能化。所有材料均通过比表面积测量（BET），XRD分析，拉曼光谱，DRS以及SEM观察进行了表征，它们已用于水悬浮液中的葡萄糖光催化转化。取决于光催化剂，观察到中间氧化产物的不同反应程度和分布。当使用裸露的TiO2或HPA / TiO2复合材料时，可观察到葡萄糖酸，阿拉伯糖，赤藓糖和甲酸为氧化产物。还观察到葡萄糖异构化形成果糖，并且在一些运行中还发现了痕量的葡糖二酸和甘油醛。碳质量平衡是在市售Evonik P25 TiO2粉末和存在TiO2的复合材料的存在下实现的，而溶剂热制备的TiO2的存在则导致了碳的不平衡，这是由于产物在光催化剂表面的强烈吸附所致。 。在单独存在PW12的情况下未观察到反应性，而PW11仅诱导葡萄糖的异构化。

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