ACF担载TiO_2光催化降解甲醛的影响因素研究

采用溶胶-凝胶法（sol-gel）在活性炭纤维（ACF）表面制备了纳米TiO2薄膜光催化材料,利用XRD和SEM对薄膜进行了表征。使用该负载型纳米TiO2光催化材料处理室内空气中的甲醛污染物,分别研究了TiO2涂膜次数、甲醛初始浓度、相对湿度、温度以及光源等因素对甲醛降解效率的影响。实验结果表明,所制得的TiO2为锐钛矿型,平均粒径为20nm左右,TiO2涂膜次数为3层时甲醛降解效率最高;甲醛初始浓度越高降解效率越低,甲醛降解效率随温度升高而增大,相对湿度为48%时甲醛降解效率最高;一定波长（λ〈387nm）的紫外光照射是使用TiO2光催薄膜降解甲醛的必要条件。

Investigation of the influencing factors on ACF/TiO_2 photocatalytic degradation of formaldehyde

The nano-TiO2 photocatalytic film loaded on the surface of the active carbon fiber （ACF） was prepared through the sol-gel method, and characterized by XRD and SEM. This material was used to treat the formaldehyde in indoor air, and the influencing factors on formaldehyde degradation, including the number of the TiO2 film layers, the initial concentration of the formaldehyde, the relative humidity, the temperature, and the source of light, were investigated. Results showed that the prepared TiO2 was anatase-structured, with average crystal size of about 20 nm. The degradation efficiency of formaldehyde was the highest with 3 film layers and 48% in relative humidity, and decreased as the initial concentration of the formaldehyde increased, or the temperature went the TiO2 photocatalytic film should be irradiated by light with certain wavelength （λ387 nm） when treating the formaldehyde.