硅藻土微粒负载纳米TiO_2的制备

Preparation of Nano-TiO_2 Immobilized onto Diatomite Micro-Particles

以硫酸氧钛为原料,硅藻土微粒为载体,尿素为沉淀剂,通过改变硫酸氧钛的浓度、硅藻土与二氧化钛质量比、尿素浓度、pH值、水解温度、反应时间和焙烧温度等工艺条件,采用混合均匀沉淀法制备出了硅藻土基负载型纳米二氧化钛.利用SEM和XRD对样品的结构性能进行测定,得出在最佳制备条件下,二氧化钛在硅藻土表面的最大覆盖率为75%,二氧化钛平均粒径为150 nm,并初步探讨了二氧化钛粒子和载体之间的结合机理.该产品对模拟室内甲醛的降解实验表明,在可见光范围内本产品对甲醛的处理效果是明显的.

The nanosized titanium dioxide immobilized onto diatomite was obtained through changing the TiOSO4 concentration, the mass ratio of diatomite to titanium dioxide, the concentration of urea, pH value, reaction temperature and time, and calcining temperature by the mixed homogeneous deposition method using diatomite as the cartier, TiOSO4 as the raw material and urea as the precipitator. The obtained photocatalyst was characterized by SEM and XRD. Under the optimum preparation conditions, the maximum loading rate of nanosized titanium dioxide on the diatomite surface was 75%, and the average diameter of loaded particles was 150 nm.We also probed to the binding mechanism of titanium dioxide particles and the carrier. The experiment of degradation of formaldehyde in the simulative reaction room demonstrates that the product is efficient in dealing with formaldehyde under the visible light.