超临界CO_2制备TiO_2 MCM-41介孔分子筛及光催化性能研究

Study on the photo catalysis and the TiO_2 MCM-41 molecular sieve made by the super critical CO_2

在超临界二氧化碳(SC-CO2)溶媒中,以钛酸四丁酯为前驱体,利用超临界溶媒的高传质性能将钛的前驱体运送到硅基分子筛MCM-41的内壁,合成了TiO2MCM-41介孔分子筛催化剂。X-射线粉末衍射和傅立叶变换红外谱图等结果表明:二氧化钛可以很好地负载在介孔结构中并保持了原来的孔道结构。以甲基橙为模拟污染分子,紫外灯为光源,研究了催化剂用量、初始溶液pH值等条件对甲基橙脱色率的影响。该合成步骤简单,材料性能优异,具有推动光催化材料污染控制和环境修复工业化的潜力。

Mesoporous molecular sieve TiO2MCM-41 was successfully synthesized in this investigation using tetrabutyl titanate as a precursor in supercritical carbon dioxide.Titanium precursor was transported and thus dispersed uniformly into the MCM-41 molecular sieve,which was confirmed by structural characterizations of X-ray powder diffraction and FT-IR analysis.Methyl Orange was selected as a simulation pollutant to evaluate the decolorization ability of as-synthesized photocatalyst and satisfactory results were found under the optimal condition.The synthetic procedure was fairly simple and produced materials had favorable properties,which would potentially employ in contamination control and environmental restoration in practice.