纳米TiO_2纤维的制备及其光催化降解甲醛研究

Preparation of Nano TiO_2 Fiber and Its Photocatalytic Degradation Behaviors to Formaldehyde

以胶原纤维为模板制备纳米TiO2纤维用于光助催化降解甲醛气体,用扫描电镜(SEM)、X射线衍射(XRD)和N2吸附-脱附技术对纳米TiO2纤维进行了表征。结果表明,纳米TiO2纤维的比表面积为11.33 m2/g,晶型为锐钛矿型。在相同催化反应条件下纳米TiO2纤维对甲醛气体的催化降解率与商品纳米TiO(2Degussa P25)催化剂相当。纳米TiO2纤维的用量、甲醛气体初始浓度是影响催化效果的两个因素。当甲醛气体初始浓度为0.270 mg/m3,相对湿度为38%,气体流速0.1 L/min,纳米TiO2纤维用量为1.0 g时,甲醛的降解率达到96%。因此,纳米TiO2纤维可用于室内甲醛气体的催化降解。

Nano-TiO2 fiber was synthesized by using collagen fiber as template for the purpose of photo-assisted catalytic degradation of gaseous formaldehyde, and characterized by means of Scanning Electron Microscopy （SEM）, N2 adsorption- desorption technique and X-ray Diffraction （XRD）. It was discovered that the specific surface area of nano-TiO2 fiber was 11.33 m2/g. Compared with Degussa P25, the degradation efficiency of as prepared nano-TiO2 fiber to gaseous formaldehyde was paralleled in some extent. Nano-TiO2 fiber dosage and formaldehyde initial concentration, the two factors that greatly influence the degradation rate of formaldehyde. Irradiating at 254 nm of UV, the degradation rate was high up to 96% when nano--TiO2 dosage was 1.0 g, and the initial concentration of gaseous formaldehyde was 0270 mghn~ and flow rate was 0.1 IAnin with 38% of humidity. Therefore, it is potential to use nano-TiO2 fiber for the catalytic degradation of gaseous formaldehyde in house.