论文部分内容阅读
采用改进的溶液—凝胶方法 ,制备出TiO2 及不同配比的TiO2 /SiO2 粉末 ,利用XRD、BET、UV -vis等手段研究了微粒的表面结构形态变化 ,以及对污染物NO-2 光催化降解的影响 .研究表明 ,TiO2 /SiO2 复合微粒的光催化活性明显高于TiO2 微粒 ,并且质量比m (Ti)∶m (si) =2∶1时催化降解NO-2 最佳 .制得TiO2 微粒以锐钛型高度分散在SiO2 网络中 ,粒径约 12nm ,并与SiO2 形成Si-O -Ti桥氧结构 ,提高了TiO2 微晶的热稳定性 .UV -vis吸收光谱显示复合微粒的光谱吸收发生蓝移 ,极利于吸附降解NO-2
The modified solution-gel method was used to prepare TiO2 and TiO2 / SiO2 powders with different proportions. The surface morphology and morphology of the particles were investigated by XRD, BET and UV-VIS. The results showed that the photocatalytic activity of TiO2 / SiO2 composite particles was significantly higher than that of TiO2 particles, and the best photocatalytic activity was NO2 when mass ratio m (Ti): m (si) = 2:1. The particles are anatase-highly dispersed in the SiO2 network with a particle size of about 12 nm and form a Si-O-Ti bridging oxygen structure with SiO2 to increase the thermal stability of the TiO2 crystallites. The UV-vis absorption spectrum shows the spectrum of the composite particles Absorption blue shift occurs, it is beneficial to the adsorption and degradation of NO-2