纳米WO_3的制备工艺探讨与结构表征

Preparation and Characterization of WO_3 Nano-Powders

通过气液反应制备了纳米WO3光催化剂,并用紫外吸收光谱、粉末X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、能量散射谱(EDS)等手段对催化剂进行了表征.讨论了乙二醇加入量和表面活性剂十二烷基苯磺酸钠对催化剂粒度大小和形貌的影响.结果表明:当水和乙二醇的比例为25∶75时所得WO3粒径为30 nm左右.在此比例条件下加入0.1 g表面活性剂十二烷基苯磺酸钠,可制得片状WO3,粒径约为80 nm.对自制的两种纳米WO3光催化剂在紫外光照射时降解苯酚的活性进行了初步探讨,两者的催化性能均明显优于商品WO3.

The WO3 nano-powders have been prepared by method of gas-liquid reaction in this work. The techniques such as solid UV/vis spectra, XRD, TEM, SEM, EDS were used to characterize the catalyst. Effects of glycol concentration along with the adding of surfactant SDBS on the particle size and the morphology of the photocatalysts were discussed in detail. The photoelec-trochemieal actions of WO3 powders were studied by degradating the phenol. It was showed that when the proportion between water and glycol is 25：75, The size of WO3 powders is about 30 nm and sheet WO3 which diameter is about 80 nm can be obtained by adding 0.1g surfaetant. Both of them have much better photocatalytic activities than the product from market.