纳米TiO2壳聚糖模板法制备及其光催化性能

Preparation of TiO_2 nanoparticles by using chitosan as template and their photocatalytic activity

以壳聚糖为模板剂,采用溶胶-凝胶法制备了平均粒径为15nm,具有较高分散性、热稳定性和光催化活性的纳米TiO2粒子.采用扫描电镜(SEM)、透射电镜(TEM)、X射线粉末衍射(XRD)、傅立叶红外光谱(FT-IR)以及紫外-可见光谱(UV-vis)等手段对产物进行了分析和表征.条件实验结果表明,在500℃下灼烧1h所得TiO2产物由锐钛矿相及少量金红石相构成.光催化实验结果表明,所得产物在日光下对有机染料亚甲基蓝有很好的催化降解作用.

In the presence of the chitosan template, the TiO2 nanoparticles with high heat stability and photocatalytic activity were prepared by a sol-gel process and calcining at 500℃. The product as -obtained was characterized by SEM, TEM, XRD and IR spectra. The results showed that the product was composed of anatase crystal and little rutile crystal TiO2 nanoparticles. The excellent photocatalytic activity of the product was confirmed by photodegradating methylene blue under sunlight.