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首页> 外文期刊>Journal of Sol-Gel Science and Technology >Photo catalytic oxidation of TNT using TiO2-SiO2 nano-composite aerogel catalyst prepared using sol-gel process
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Photo catalytic oxidation of TNT using TiO2-SiO2 nano-composite aerogel catalyst prepared using sol-gel process

机译：溶胶-凝胶法制备的TiO2-SiO2纳米复合气凝胶催化剂对TNT的光催化氧化

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The degradation of nitro aromatics like trinitrotoluene (TNT) released in the waste water from explosive process plants is the serious problem due to toxic and explosive nature of TNT. The poor response of TNT to biodegradation enhanced the gravity of the problem. We have demonstrated that high specific surface area TiO2-SiO2 nano-composite aerogel is promising photo catalyst in successful treating of TNT contaminated aqueous solution. The TiO2-SiO2 composite aerogel with nominal content of 20 and 50% TiO2, used as catalyst, were prepared by co-precursor sol-gel method using titanium isopropaxide and tetramethylorthosilicate as source of titania and silica, respectively. The XRD studies confirmed formation of anatase phase of crystalline TiO2 with nano sized crystallites. The TiO2-SiO2 aerogel showed specific surface area of 1,107 and 485 m~2/g for the aerogels containing 20 and 50% TiO2, respectively. The 100 ppm TNT solution wastreated, in 700 ml capacity reaction vessel, using H2O2 oxidizer and TiO2-SiO2 aerogel catalyst in presence of UV light (8 W UV lamp). Using TiO2-SiO2 (50/50) aerogel with surface area of 485 m~2/g, we succeeded to reduce the TOC to 1 ppm within 3.5 h where as using TiO2/SiO2 (20/ 80) aerogel with surface area of 1,107 m~2/g, the TOC was reduced to about only 7 ppm in the same time. It revealed that the combination of high TiO2 content and high specific surface area is an important factor to achieve effective and faster degradation of TNT for complete mineralization.
机译：由于TNT的毒性和爆炸性，爆炸性加工厂废水中释放的硝基芳族化合物如三硝基甲苯（TNT）的降解是一个严重的问题。 TNT对生物降解的不良反应增加了问题的严重性。我们已经证明，高比表面积的TiO2-SiO2纳米复合气凝胶是成功处理TNT污染水溶液的有希望的光催化剂。采用共前体溶胶-凝胶法，分别用异丙基钛酸钛和原硅酸四甲酯作为二氧化钛和二氧化硅的原料，通过共前体溶胶-凝胶法制备了标称含量分别为20％和50％的TiO2的TiO2-SiO2复合气凝胶。 XRD研究证实了具有纳米微晶的晶体TiO2的锐钛矿相的形成。对于含20％和50％TiO2的气凝胶，TiO2-SiO2气凝胶的比表面积分别为1,107和485 m〜2 / g。在H 2 O 2氧化剂和TiO 2 -SiO 2气凝胶催化剂中，在紫外线（8 W紫外线灯）存在下，在700毫升容量的反应容器中处理100 ppm TNT溶液。使用表面积为485 m〜2 / g的TiO2-SiO2（50/50）气凝胶，我们成功地在3.5小时内将TOC降至1 ppm，而使用表面积为1,107的TiO2 / SiO2（20/80）气凝胶m〜2 / g时，TOC同时降低到仅约7 ppm。结果表明，高TiO2含量和高比表面积的结合是实现TNT有效和快速降解以完全矿化的重要因素。

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