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为了获得具有网络结构和纳米级粒子的TiO2光催化材料,使之负载到活性炭纤维(ACF)上,并在紫外光的作用下,达到有效降低室内空气中污染物的目的,以钛酸丁酯(Ti(OC4H9)4为原料,乙酸和乙酰丙酮为水解催化剂,利用Sol-Gel方法制备凝胶,并利用超临界流体干燥手段制备TiO2气凝胶。溶胶—凝胶反应溶液的配比为Ti(OR)4∶EtOH∶H2O∶AcOR∶ACACH=20∶40∶5∶0.2∶2(体积比,mL),可在120 min左右得到醇凝胶。将醇凝胶置于-21℃条件下陈化1~3 d,然后在12 h内自然升温至室温,24 h内置于超临界流体中进行干燥,可以得到具有纳米结构的TiO2气凝胶。该气凝胶可用于制备ACF/TiO2复合材料。
In order to obtain TiO2 photocatalytic material with network structure and nano-scale particles, which is supported on activated carbon fiber (ACF) and under the action of UV light, the purpose of effectively reducing indoor air pollutants is achieved. (Ti (OC4H9) 4 as raw material, acetic acid and acetylacetone as hydrolysis catalyst, using Sol-Gel method to prepare gel and using supercritical fluid drying method to prepare TiO2 airgel.The sol-gel reaction solution is Ti (OR): EtOH: H2O: AcOR: ACACH = 20:40:5:0.2:2 (volume ratio, mL), an alcoholic gel was obtained in about 120 min. The alcohol gel was placed at -21 ° C Aging 1 ~ 3 d, and then naturally heated to room temperature within 12 h, 24 h built in a supercritical fluid for drying, you can get nano-structured TiO2 airgel. The airgel can be used to prepare ACF / TiO2 composite material.