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以钛酸正丁酯为前驱体、乙醇和水为主要溶剂,采用溶剂热法合成了纳米TiO2,并形成一种溶剂热负载工艺.利用热重分析(TG-DSC)、X射线衍射(XRD)、透射电子显微镜(TEM和HRTEM)以及比表面积测定(BET)等手段表征了有/无溶剂热处理、有/无灼烧处理等4个纳米TiO2样品.结果表明,经过溶剂热处理的TiO2颗粒呈立方体状,有良好的(101)晶面结晶度、较高的热稳定性和比表面积;SEM表征负载TiO2薄膜结果显示,溶剂热负载工艺制得的TiO2薄膜具有均匀且牢固的特点.以气相苯的光催化氧化为探针考察TiO2薄膜的光催化活性发现,溶剂热后的灼烧处理会降低催化剂的比表面积,进而导致催化剂活性的下降;溶剂热后未灼烧和灼烧的催化剂降解400mg/m3苯的活性分别为未经溶剂热处理的4.1倍和3.7倍.
Nano-TiO2 was synthesized by solvothermal method using n-butyl titanate as precursor, ethanol and water as the main solvents, and a solvothermal loading process was established. The structure of the nano-TiO2 was characterized by TG-DSC, XRD ), Transmission electron microscopy (TEM and HRTEM) and specific surface area measurement (BET) were used to characterize the four nanosized TiO2 samples with / without solvothermal treatment and / or without burning treatment.The results showed that the TiO2 particles treated with solvothermal treatment (101) crystallinity, high thermal stability and specific surface area. SEM characterization of TiO2 films showed that the TiO2 thin films prepared by solvothermal loading process had the characteristics of uniform and firm, The photocatalytic oxidation of benzene as a probe examines the photocatalytic activity of TiO2 thin films. It is found that the burning treatment after solvothermal treatment decreases the specific surface area of the catalyst, which leads to the decrease of the activity of the catalyst. The catalyst which is not burned and burned after solvent heating degrades The activity of 400mg / m3 benzene was 4.1 times and 3.7 times that of the non-solvent heat treatment respectively.