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首页> 外文期刊>Applied Surface Science >Preparation Of Tio_2-carbon Surface Composites With High Photoactivity By Supercritical Pretreatment And Sol-gel Processing
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Preparation Of Tio_2-carbon Surface Composites With High Photoactivity By Supercritical Pretreatment And Sol-gel Processing

机译：超临界预处理和溶胶-凝胶法制备高光活性Tio_2-碳表面复合材料

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摘要

TiO_2-carbon surface (TCS) composites were prepared by pretreatment of a sealing substrate in supercritical carbon dioxide using paraffin as a plugging agent, and sol-gel processing using tetrabutyl orthotitanate as a precursor. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectrum (XPS), optical absorption spectroscopy and nitrogen absorption. The photoactivity of TCS was checked by monitoring the decomposition of methylene blue (MB) in aqueous solution under UV irradiation. The results indicated that compared with TC prepared only by the sol-gel method, the small nanosize TiO_2 particles are well dispersed on carbon surface with large amount of micropores and high Eg values, meanwhile TCS have high Ti~(3+) concentration due to supercritical pretreatment providing a amount of carbon on the composite surface with interfacial energy effects, which controls the growth of TiO_2 nanoparticles, baffles the agglomeration of TiO_2 nanoparticles and easily produces Ti~(3+) ions. These are reasons why TCS has a higher efficiency of decomposing MB than TiO_2-carbon (TC) composites and pure TiO_2. Additional, it is also attributed to the fact that TCS produce a high concentration of organic compounds near TiO_2 in comparison with TC and pure TiO_2, because their surface area are greater than that of TC and pure TiO_2.
机译：TiO_2-碳表面（TCS）复合材料的制备方法是：使用石蜡作为堵漏剂，在超临界二氧化碳中对密封基材进行预处理，然后使用原钛酸四丁酯作为前体进行溶胶-凝胶工艺。样品通过X射线衍射（XRD），扫描电子显微镜（SEM），X射线光电子能谱（XPS），光学吸收光谱和氮吸收进行表征。通过监测紫外线下水溶液中亚甲基蓝（MB）的分解来检查TCS的光活性。结果表明，与仅通过溶胶-凝胶法制备的TC相比，纳米TiO_2小颗粒良好地分散在碳表面，具有大量的微孔和较高的Eg值，同时TCS具有较高的Ti〜（3+）浓度。超临界预处理可在复合表面上提供一定量的碳，并具有界面能效应，从而控制TiO_2纳米粒子的生长，阻碍TiO_2纳米粒子的团聚并容易产生Ti〜（3+）离子。这就是为什么TCS具有比TiO_2-碳（TC）复合材料和纯TiO_2更高的MB分解效率的原因。另外，还归因于以下事实：与TC和纯TiO_2相比，TCS在TiO_2附近产生高浓度的有机化合物，因为它们的表面积大于TC和纯TiO_2的表面积。

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