有序介孔金属氧化物的合成及其光催化性能表征

以钛酸异丙酯Ti(OCH(CH3)2)4]、正硅酸四乙酯Si(OC2H5)4,TEOS]、钽酸乙酯Ta(OC2H5)5]、铌酸乙酯Nb(OC2H5)5]为原料,采用溶胶-凝胶法成功合成了80TiO2.20SiO2和TaNbO5复合介孔分子筛.XRD表征结果表明,新合成样品的介观结构皆具有高的有序度;550℃焙烧去除模板剂后,仍保持良好的有序度.在焙烧过程中80TiO2.20SiO2骨架内有锐钛矿纳米晶粒产生,而TaNbO5仍保持无定形相.在紫外光照射下,介孔80TiO2.20SiO2和TaNbO5对分解H2S气体皆表现出高的光催化活性.介孔80TiO2.20SiO2分解H2S的活性是无孔80TiO2.20SiO2的近16倍.

Synthesis and Photocatalytic Performance Characterization of Ordered Mesoporous Metal Oxides

Mesoporous 80TiO2·20SiO2 and TaNbO5 composite molecular sieves are reported to be successfully synthesized by a sol-gel method from Ti(OCH(CH3)2)4,Si(OC2H5)4,Ta(OC2H5)5 and Nb(OC2H5)5.XRD results indicate that the mesostructures of as-synthesized samples are highly ordered.After calcination at 550 ℃ to remove the template molecules,the mesoporous structures still maintain good ordering degree.On calcination,anatase nano-crystallites are produced in the 80TiO2·20SiO2 composites,whereas TaNbO5 still retain amorphous.Under the UV light irradiation,the mesoporous 80TiO2·20SiO2 and TaNbO5 composites exhibit high photocatalytic activities to the decomposition of H2S.The photocatalytic decomposition activity of H2S on the mesoporous 80TiO2·20SiO2 is 16 times higher than that on the non-porous 80TiO2·20SiO2.