以钛酸四丁酯为钛源，采用改进溶胶凝胶法合成TiO2前驱体；采用浸渍提拉法将TiO2前驱体负载在活性炭纤维(ACF)表面制得TiO2/ACF复合材料.采用X射线衍射（XRD）、扫描电镜（SEM）、低温液氮吸附等对TiO2/ACF复合材料晶相结构、表面结构等进行了表征.在静态自制光催化反应装置中紫外光照射条件下，以高浓度（2926.5mg/m3）气态苯考察TiO2/ACF对气相有机污染物的去除性能，以气相色谱质谱（GC-MS）检测中间产物种类与分布.结果表明：TiO2于ACF表面形成完整薄层，随负载次数增加，TiO2/ACF比表面积下降；TiO2薄层变厚、开裂，甚至脱落.400 ℃煅烧时TiO2已完全转变为锐钛矿相，随煅烧温度升高，锐钛矿型TiO2晶粒尺寸变大，至700℃时开始有金红石相生成.负载2次，400 ℃煅烧TiO2/ACF复合材料TiO2/ACF-400-2表现出最高活性.TiO2/ACF对苯的去除过程中未检测到毒性较大的酚、醌类中间产物.
TiO2/ACF composite was prepared by improved solgel method using Ti(OBu)4 as titanium source. TiO2 precursor was loaded on activated carbon fiber (ACF) by dip-coating method. X-ray diffraction (XRD), scanning electron microscopy (SEM) and N2 (77K) adsorption were used to characterize the obtained composite. High concentration gaseous benzene in a staticmode photocatalytic reactor was used as model compound for photocatalytic activity test. Gas chromatographmass spectrum (GC-MS) was used for intermediates identification. The results show that TiO2 can form perfect thin film on ACF surface. With the increase of dipcoating times, surface area of TiO2/ACF decrease, thickness of TiO2 film increase, then split and even fall off. Complete anatase can be formed for the sample calcinated at 400℃ and phase transformation of anatase to rutile occurrs at 700℃. The crystal size of TiO2 decrease with the increase of calcination temperature. The sample of TiO2/ACF-400-2 calcinated at 400℃ and dip-coated twice exhibits the highest activity for benzene removal. Intermediate analysis result reveals that no toxic of phenol and quinine compound is detected.
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