论文部分内容阅读
以甲基橙的光催化降解为探针反应,从表观降解率和TOC去除率两个指标评价了纳米TiO2样品在不同焙烧温度和反应气氛下的光催化活性。结果表明,400℃焙烧的锐钛矿型TiO2纳米粒子的晶粒尺寸为11.69nm,在光催化降解甲基橙的实验中表现出最佳的光催化活性。光催化反应进行20min后对甲基橙的表观降解率达98.99%,反应进行30min后对甲基橙水溶液TOC的去除率为79.36%,TOC的去除效果滞后于色度的去除。不通空气时,样品对甲基橙的降解率最差,降解速率明显滞后于通空气和O2的情况,且通O2的降解效果更好。
The photocatalytic degradation of methyl orange was used as the probe reaction. The photocatalytic activity of the nano-TiO2 samples at different calcination temperatures and reaction atmospheres was evaluated from the apparent degradation rate and TOC removal rate. The results show that the grain size of anatase TiO2 nanoparticles calcined at 400 ℃ is 11.69 nm, which shows the best photocatalytic activity in the photocatalytic degradation of methyl orange. After 20min, the apparent degradation rate of methyl orange reached 98.99%. After 30min reaction, the removal rate of TOC to methyl orange aqueous solution was 79.36%, and the removal efficiency of TOC lagged the removal of chroma. The degradation rate of methyl orange was the worst, the degradation rate obviously lagged behind that of air and O2, and the degradation of O2 was better.