High surface area, high catalytic activity titanium dioxide aerogels prepared by solvothermal crystallization

• 作者: Huaxin Li Junhui Xiang Junyong Chen Xian Yue Xianbo Yu Yunsheng Qiu
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（12）
• 页码范围: 223-230
• 页数: 8页
• 语种: 英文

摘要

Titanium dioxide has been considered to be one of the most effective and environmental friendly photocatalytic material.It has been widely used in photocatalytic degradation of various pollutants.As we known,an anatase crystal form typically obtained by high temperature heat treatment (＞600 ℃),usually shows higher catalytic activity.In order to further improve the catalytic efficiency,we prepared TiO2 with a non-supercritical drying method to form a high specific surface area aerogel structure,along with an increased active contact site.However,with the inevitable of internal pores collapse in the process of high temperature crystallization,a large amount of porous structure and specific surface area is reduced.Here,to enhance the photocatalytic activity of titania,we propose a synergistic strategy to fabricate a porous titania structure with a high specific surface area.It was crystallized at a lower temperature (120 ℃) in a low-boiling solvent (ethanol,acetone,etc.).The lattice structure was identified by X-ray diffractometry;specific surface area (over 300 m2/g) of our sample was also measured through BET test;in the subsequent photocatalytic degradation test,the photocatalytic degradation efficiency of fabricated TiO2 is proved to be more excellent than P25 powder.By a freeze-drying/mild crystallization method,a high-specific surface area and high catalytic activity TiO2 aerogel was synthetized.This study provides some insights in the combining of crystallization and high specific surface area of titanium dioxide photocatalysis.