TiO2/硅藻土基多孔陶瓷复合材料的制备及降解甲醛性能

PREPARATION OF TiO_2/DIATOMITE-BASED POROUS CERAMICS COMPOSITES AND PERFORMANCES OF DEGRADATION FORMALDEHYDE

采用固相烧结法和低温煅烧工艺,制备了硅藻土基多孔陶瓷支承体。以四氯化钛为前驱体,采用水解沉淀法在支承体上负载纳米TiO2复合膜。用X射线衍射仪和扫描电子显微镜等对TiO2复合膜/多孔陶瓷支承体的复合结构进行了表征;并以甲醛为降解对象,考察了TiO2复合膜的光催化性能。结果表明:纳米TiO2/硅藻土基多孔陶瓷复合膜在550℃煅烧后TiO2为锐钛矿型,平均晶粒粒径为10.9nm。在紫外光照射240min后,甲醛气体初始浓度由0.463mg/m3降至0.015mg/m3,复合材料对甲醛的去除率达到96.8%。

A supporting body of diatomite-based porous ceramics was prepared by a solid-phase sintering process and low-temperature calcination process. A nano-TiO2 compound membrane was loaded on the supporting body by the hydrolysis precipitation method and using TiCl4 as the forerunner body, and the TiOE/diatomite-based porous ceramic composite structure was characterized by X-ray diffi＇action and scanning electron microscopy and so on. The photocatalytic activities of TiO2 films were investigated by the degradation of formaldehyde. The results indicate that the TiO2 films in TiO2/diatomite-based porous ceramic composite calcined at 550℃ are anatase, and the average grain size of TiO2 is 10.9 rim. The elimination rate of the composites for formaldehyde reaches 96.8% in 6 h under an ultraviolet lamp irradiation of 8 W, and the concentration of formaldehyde drops to 0.015 mg/m3 from 0.463 mg/m3.