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首页> 外文期刊>Chemistry: A European journal >Synthesis of Mesoporous TiO_2/SiO_2 Hybrid Films as an Efficient Photocatalyst by Polymeric Micelle Assembly
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Synthesis of Mesoporous TiO_2/SiO_2 Hybrid Films as an Efficient Photocatalyst by Polymeric Micelle Assembly

机译：聚合胶束法合成介孔TiO_2 / SiO_2杂化膜作为高效光催化剂

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摘要

Thermally stable mesoporous TiO_2/SiO_2 hybrid films with pore size of 50 nm have been synthesized by adopting the polymeric micelle-assembly method. A triblock copolymer, poly(styrene-b-2-vinyl pyridine-b-ethylene oxide), which serves as a template for the mesopores, was utilized to form polymeric micelles. The effective interaction of titanium tetraisopropoxide (TTIP) and tetraethyl orthosilicate (TEOS) with the polymeric micelles enabled us to fabricate stable mesoporous films. By changing the molar ratio of TEOS and TTIP, several mesoporous TiO_2/SiO_2 hybrid films with different compositions can be synthesized. The presence of amorphous SiO_2 phase effectively retards the growth of anatase TiO_2 crystal in the pore walls and retains the original mesoporous structure, even at higher temperature (650 8C). These TiO_2/SiO_2 hybrid films are of very high quality, without any cracks or voids. The addition of SiO_2 phase to mesoporous TiO_2 films not only adsorbs more organic dyes, but also significantly enhances the photocatalytic activity compared to mesoporous pure TiO_2 film without SiO_2 phase.
机译：采用聚合物胶束组装法合成了孔径为50 nm的热稳定介孔TiO_2 / SiO_2杂化膜。利用三嵌段共聚物聚（苯乙烯-b-2-乙烯基吡啶-b-环氧乙烷）作为中孔的模板，以形成聚合物胶束。四异丙氧基钛（TTIP）和原硅酸四乙酯（TEOS）与聚合物胶束的有效相互作用使我们能够制造出稳定的介孔膜。通过改变TEOS和TTIP的摩尔比，可以合成几种不同组成的介孔TiO_2 / SiO_2杂化膜。非晶态SiO_2相的存在有效地阻碍了孔壁中锐钛矿型TiO_2晶体的生长，即使在较高温度（650 8C）下也保持了原始的中孔结构。这些TiO_2 / SiO_2杂化膜的质量很高，没有任何裂纹或空隙。与没有SiO_2相的中孔纯TiO_2膜相比，向介孔TiO_2膜中添加SiO_2相不仅吸附了更多的有机染料，而且显着增强了光催化活性。

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