溶胶-凝胶-微波法制备银掺杂TiO_2光催化剂及其光催化性能  

Preparation of Ag-doped TiO_2 photocatalyst by sol-gel and microwave radiation method and its photocatalytic performance

作　　者：卢月洁 王鑫[1] 毕先均 

机构地区：[1]云南师范大学化学化工学院,云南昆明650500

出　　处：《工业催化》2016年第11期19-26,共8页Industrial Catalysis

基　　金：国家自然科学基金(20663007)资助项目

摘　　要：用硝酸银和钛酸正丁酯为原料,采用溶胶-凝胶-微波辐射干燥法合成银掺杂TiO_2光催化剂TiO_2-Ag。为了提高催化剂的光催化活性和降解有机污染物的速率,用微波辅助Ti O2-Ag光催化剂降解有机污染物。通过扫描电子显微镜、红外光谱法、紫外可见光谱法和荧光光谱法对TiO_2-Ag催化剂进行测试和表征。以甲基橙为有机污染物,分别在太阳光照射和微波、紫外、紫外-微波条件下降解甲基橙以考察催化剂的光催化活性。结果表明,TiO_2-Ag光催化剂最佳制备条件为:银掺杂量n(Ag+)∶n(Ti^(4+))=0.003,离子液体用量3.0 m L,微波干燥功率210 W,微波干燥时间20 min,焙烧温度650℃,焙烧时间3 h,此条件下制备的TiO_2-Ag光催化剂在太阳光照射4 h下,紫外光照、微波辐射和紫外光照-微波辐射分别辐射55 min后,甲基橙降解率分别为98.70%、98.79%和99.05%。Using silver nitrate and tetrabutyl prepared by sol-gel and microwave radiation titanate as raw materials, Ag-doped TiO2 photocatalysts were drying method. The microwave assisted Ag-doped TiO2 photo- catalyst was applied in the degradation of organic pollutants in order to improve photocatalytic performance of the catalysts and accelerate the degradation rate of organic pollutants. Ag-doped TiO2 photocatalysts were characterized by scanning electron microscopy,infrared spectroscopy, UV-Vis spectroscopy and fluo- rescence spectroscopy. The photocatalytic activity of the as-prepared photocatalysts for degradation of methyl orange was investigated under the irradiation of sun light, microwave irradiation, ultraviolet and ultraviolet microwave. The results showed that the optima/preparation condition was as follows ： n （ Ag^＋ ） ： n（ Ti^4＋） =0,003, ionic liquid amount 3.0 mL, microwave drying power 210 W, microwave drying time 20 min,ealeination temperature 650 ℃ and calcination time 3 h. TiO2-Ag catalyst prepared under the optimal condition possessed better photocatalytie performance. The degradation rate of methyl orange were 98.70%, 98.79% and 99.05% ,respectively after the irradiation of sun light for 4 h,and then UV,MW and UV-MW respectively for 55 min.

关 键 词：催化化学 银掺杂 TIO2光催化剂 微波增强效应 光催化活性 

分 类 号：O643.36[理学—物理化学] TQ426.99[理学—化学]