银掺杂多孔氧化钛光催化甲基橙降解反应条件的探究

DEGRADATION REACTION CONDITIONS OF METHYL ORANGE PHOTOCATALYZED BY AG-DEPOSITED POROUS TITANIUM OXIDE

利用溶胶-凝胶法结合光还原法制备Ag掺杂多孔TiO_2光催化剂,以甲基橙的降解效果为评价标准,考查了光照降解时间、光催化剂用量、甲基橙溶液初始浓度、溶液pH值对光催化剂催化降解甲基橙的影响。结果表明,本方法制备的光催化剂无论是在紫外光还是可见光下均具有优良的光催化性能:在浓度为10 mg/L的甲基橙溶液中,4 g/L光催化剂,紫外光照射80 min,甲基橙可实现100%完全降解;相同催化条件下,可见光照100 min,甲基橙完全降解;当反应溶液pH=2时,紫外光和可见光都可在20 min内实现甲基橙的完全降解。

Ag-deposited porous TiO_2 powders were prepared by sol-gel method combined with reduction method. The effects of the degradation conditions such as irradiation time, amount of catalyst, the initial concentration of methyl orange solution, p H value and additional oxidant on photocatalytic degradation of methyl orange under ultraviolet irradiation of Ag-deposited porous TiO_2 were investigated. The results showed that the prepared photocatalyst had excellent photo-catalytic properties. When 4 g/L Ag-deposited porous TiO_2 was added in 10 mg/L methyl orange solution, and the solution was exposured under UV light for 80 min or visible light for 100 min, the methyl orange can be fully degraded. When p H=2, the methyl orange can be degraded completely in 20 min under both UV and visible light.