CAJ | 학술논문

以无机盐 TiCl4为原料制备 TiO2溶胶 ,并利用溶胶胶粒修饰法制备 SiO2-TiO2、 ZrO2-TiO2、 WO3-TiO3、 MoO3-TiO2及 Pt/TiO2光催化剂 ,用于光催化氧化甲醛反应 ,考察添加物对催化剂光催化性能的影响 .其中 ,SiO2-TiO2催化剂的光催化氧化降解甲醛性能最好 ,而 MoO3-TiO2的催化性能最差 .SiO2-TiO2催化剂优良的光催化性能可归于 SiO2-TiO2催化剂的高比表面积 ,高空隙率 ,小晶粒粒径和强吸光性能等性质的综合影响 .
이무궤염 TiCl4위원료제비 TiO2용효 ,병이용용효효립수식법제비 SiO2-TiO2、 ZrO2-TiO2、 WO3-TiO3、 MoO3-TiO2급 Pt/TiO2광최화제 ,용우광최화양화갑철반응 ,고찰첨가물대최화제광최화성능적영향 .기중 ,SiO2-TiO2최화제적광최화양화강해갑철성능최호 ,이 MoO3-TiO2적최화성능최차 .SiO2-TiO2최화제우량적광최화성능가귀우 SiO2-TiO2최화제적고비표면적 ,고공극솔 ,소정립립경화강흡광성능등성질적종합영향 .
Titania sols were prepared by acid hydrolysis of a TiCl4 precursor and mixed oxides SiO2-TiO2,ZrO2-TiO2,WO3-TiO3 and MoO3-TiO2 as well as Pt/TiO2 catalysts for the photocatalytic oxidation of formaldehyde were obtained by using the method of the modification of sol particles.The influence of the additives on the photocatalytic activity was investigated.Comparing with pure TiO2,the addition of silica or zirconia increased the photocatalytic activity,while the addition of Pt and MoO3 decreased the activity,and the addition of WO3 had little effect on the activity.Among these catalysts,the activity of the SiO2-TiO2 catalyst was the best while that of the MoO3-TiO2 catalyst was the worst.It is of great significance that the conversion of formaldehyde was increased up to 94％ over the SiO2-TiO2 catalyst.The increased activity of the SiO2-TiO2 catalyst was due to the higher surface area and porosity,the smaller crystallite size and the stronger adsorption of UV light.A comparison of our catalyst compositions with those in the literature suggested that the difference in activity due to the addition of a second metal oxide maybe caused by the surface chemistry of the catalysts,particularly the acidity.