赤铁矿紫外光催化苯胺的研究

摘要:选择氧化-相转变法制备纳米-Fe2O3,并通过X射线衍射分析仪(XRD)、红外光谱仪(FT-TR)、综合热重分析仪(TG)对样品进行了表征.以苯胺为模型化合物,通过正交实验法确定了-Fe2O3对苯胺光催化降解的最佳实验条件,重点讨论了苯胺初始质量浓度(A)、光照射时间(B)、赤铁矿投加量(C)和pH(D)等因素对催化效率的影响.并测试了赤铁矿的光催化性能.实验结果表明:苯胺初始质量浓度为7mg/L,赤铁矿投加量为0.025g/L,pH值为6的催化效果最好,紫外光照射90min时,降解率达90%.且各因素对降解的影响顺序为:A?D?C?B.-Fe2O3对苯胺的光催化动力学行为符合Langmuir-Hinshelwood模型.

STUDY ON PHOTOCALYTIC DEGRADATION OF ANILINE WITHα-Fe2O3

The nano--Fe2O3 was prepared by a hydrothermal process and then sintered at temperature of 420℃. The prepared sample was characterized by X-ray diffraction (XRD), infrared spectroscopy(FT-IR) and thermogravimetry (TG). The aniline was used as a model compound because of its toxicity. The main factors such as initial concentration of aniline, adding dose of hematite，solution pH value and time of degradation were discussed for the removal efficiency of aniline. The orthodoxy experiment was investigated to get the optimized conditions that the initial concentration of aniline is about 7 mg/L，the adding dose of hematite is 0.025g/L，the pH value is 6 and the time of degradation is 90 min．The effect order of factors to photocatalytic degradation is:A?D?C?B. Photocatalytic degradation of aniline is fit well to the model of Langmuir-Hinshelwood (L-H)．