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首页> 外文期刊>RSC Advances >Green and facile sol–gel synthesis of the mesoporous SiO2–TiO2 catalyst by four different activation modes
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Green and facile sol–gel synthesis of the mesoporous SiO2–TiO2 catalyst by four different activation modes

机译：绿色和体面溶胶 - 凝胶通过四种不同的活化模式合成中孔SiO2-TiO2催化剂

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The most environmentally friendly protocol for obtaining mesoporous SiO _(2) –TiO _(2) catalysts has been sought. Water has been employed as a green solvent, the energy input has been minimized, and three further principles (1, 3, and 12) of Green Chemistry have been considered. Four different modes for promoting the reaction have been comparatively evaluated, namely near-infrared and microwave electromagnetic irradiations, ultrasound, and traditional mantle heating. Brunauer–Emmett–Teller (BET) analyses of the catalysts produced revealed that the non-conventional activation modes afforded both large surface areas (335–441 m ~(2) g ~(?1) ) and smaller crystal sizes (7.2–15.3 nm) than the mantle heating process. These modes also generated the catalysts in shorter reaction times than traditional mantle heating, 10–30 min versus 3 h, with anatase as the sole crystalline phase. The photocatalytic degradation of 4-chlorophenol has been carried out to assess the catalytic efficiencies of the hybrid materials. The catalyst synthesized with microwave assistance showed the best mineralization activity (97%), followed by those prepared with ultrasound, near-infrared, and mantle heating. The materials have been extensively characterized by FTIR, XRD, DRS-UV/Vis, SEM, ~(29) Si MAS NMR, and BET analyses. To the best of our knowledge, this is the first such comparative assessment of green energetic alternatives in developing a sol–gel process.
机译：已经寻求最环保的获得介孔SiO _（2）-tiO _（2）催化剂的型催化剂的方案。水已被用作绿色溶剂，能源输入已最大限度地减少，并考虑了绿色化学的三种进一步的原则（1,3和12）。促进反应的四种不同模式已经相对评价，即近红外线和微波电磁照射，超声波和传统的地幔加热。 Brunauer-Emmett-Teller（Bet）分析所产生的催化剂显示，非常规活化模式提供大表面积（335-441m〜（2）G〜（α1））和较小的晶体尺寸（7.2-15.3 nm）比地幔加热过程。这些模式还在较短的反应时间内产生的催化剂，而不是传统的露面加热，10-30分钟，与锐钛矿为唯一的结晶相。已经进行了4-氯苯酚的光催化降解，以评估杂化材料的催化效率。用微波辅助合成的催化剂显示出最佳的矿化活性（97％），其次是用超声波，近红外线和搭配加热制备的那些。该材料已广泛以FTIR，XRD，DRS-UV / VI，SEM，〜（29）Si Mas NMR和BET分析为特征。据我们所知，这是开发溶胶过程中绿色能量替代品的第一个比较评估。

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