关键词：
Ti O2;Ag掺杂;甲醛;光催化;降解
摘 要：
以钛酸丁酯为前驱体,通过sol-gel法制备Ag-Ti O2复合纳米粉体,采用SEM、XRD、XPS对样品进行结构表征,Ag-Ti O2纳米粉体为立方体形锐钛矿型,平均粒径约为20~50nm。在避光条件下考察不同Ag掺量、甲醛初始浓度、p H对光催化降解甲醛的影响。结果表明,本实验条件下最佳的掺Ag量为8%,Ag-Ti O2对于低浓度甲醛溶液具有较高的降解率;随着甲醛溶液p H的升高,Ag-Ti O2复合纳米粉体的光催化活性逐渐降低;在200m L浓度为0.1mg/m L甲醛水溶液中,添加0.20g掺Ag量8%的Ag-Ti O2光催化剂,调节溶液p H=2,紫外灯辐照300min,甲醛降解率可达到93.1%;Ag-Ti O2光催化降解甲醛符合朗格缪尔-欣伍(Langmuir-Hinshelwood)一级反应动力学模型。
译 名：
Preparation of Ag-Ti O_2 nanocomposite photocatalyst and research on its degradation to formaldehyde from aqueous solution
作 者：
WU Yong-jun;Maanshan Teacher's College,Software and Food Engineering Department;
关键词：
Ti O2;;Ag doped;;formaldehyde;;photocatalytic;;degradation
摘 要：
Ag-Ti O2 nanocomposite photocatalyst were prepared by the sol-gel method with Ti(OBu)4as precursor.The samples had been characterized by SEM,XRD and XPS techniques. Test results showed that Ag-Ti O2 nanoparticles were cubic anatase phase and the average particle size was in the range of 20~50nm. Removal rate of formaldehyde with different Ag doping quantity,initial formaldehyde concentration and solution p H were studied in the absence of light. The results showed that the optimal doped quantity under the experimental condition was 8%,Ag-Ti O2 nanocomposite photocatalyst had higher degradation rate to low concentration formaldehyde solution,and the photocatalytic activity of Ag-Ti O2 gradually reduced with the increase of solution p H. Under the optimal conditions,0.20 g Ag-Ti O2 photocatalyst with Ag-doping content was 8% was added in200 m L 0.1mg/m L formaldehyde,the solution p H was adjusted to 2,formaldehyde degradation rate could reach93.1% after UV irradiation for 300 min. The kinetics of formaldehyde degradation by Ag-Ti O2 nanocomposite photocatalyst could be described by Langmuir-Hinshelwood first-order kinetics model.
