二氧化钛-活性炭复合光催化材料的制备及表征

Preparation and characterization of photocatalytic material of TiO_2-active carbon composite

以二氧化钛纳米粉和环氧树脂为原料,制备了具有光催化活性的二氧化钛-活性炭复合材料。用热分析(TG-DSC)、X射线衍射(XRD)等手段对其表征,发现复合材料中的二氧化钛以锐钛矿晶型存在。通过扫描电镜(SEM)对复合材料进行分析,表明其颗粒直径约为100 nm。光催化氧化实验表明,复合材料对甲基橙溶液具有很好的光催化活性。研究结果表明,在实验条件下,甲基橙溶液的光催化脱色和矿化过程是同时进行的,而且活性炭的吸附作用使复合材料的催化效率比单纯的二氧化钛粉末有很大的提高。这是由于其对可见光的吸收(黑色),使复合材料不仅在紫外区,而且在可见光区域也有很好的催化效果。所以,复合材料可以解决二氧化钛作为光催化剂在实际应用中存在的太阳能利用率低的问题。

TiO2 - active carbon composite material with high photocatalytic activity has been prepared by using nano - sized TiO2 powder and epoxide resin as raw materials. The sample was characterized by thermal gravimetry and differential scanning calorimetry analysis （ TG - DSC ） and X - ray diffraction （ XRD ） etc.. It demonstrated that the TiO2 in composite existed as anatase. The particle diameter of TiO2 - active carbon composite was 100 nm under scanning electronic microscope （ SEM ）. The experiment of photoeatalytie oxidation of methyl orange showed that the composite has a high photocatalyric activity. The research results indicated that, photocatalytic decoloration and mineralization process were taken place simultaneously under experimental conditions. And the composite＇s photocatalytic activity was much higher than that of single TiO2 powde for the adsorption of active carbon. The composite not only have a good performance in the ultraviolet region, but also have a very good performance in the visible light region, because of its absorption to visible light （black）. So, the low solar energy utilization ratio of TiO2 as photocatalytic catalyst can be significantly improved in the practical application.