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通过液相法制备出钨酸/DWCNTs和纯钨酸2种前驱体,然后在氮气气氛下焙烧至700℃,保温2 h,分别生成了WO_3/DWCNTs和WO_3粉末。采用扫描电子显微镜和X射线衍射仪对产物的形貌和结构进行表征。在11 W可见光的照射下,分别利用WO_3/DWCNTs和WO_3粉末对有机染料亚甲基蓝进行光催化降解反应;利用紫外-可见分光光度计测定出样品的紫外可见吸收光谱,通过朗伯比尔定律计算出光催化降解率。当光照时间为30 min时,WO_3/DWCNTs降解率达到87.50%,纯WO_3降解率仅为25.39%。结果表明,DWCNTs的加入可以有效抑制颗粒的团聚,减小颗粒尺寸,增大WO3的比表面积,增强WO_3的吸附能力,显著提高WO_3对亚甲基蓝的光催化降解效率。
Two precursors of tungstic acid / DWCNTs and pure tungstic acid were prepared by liquid phase method, and then calcined to 700 ℃ for 2 h in a nitrogen atmosphere to produce WO_3 / DWCNTs and WO_3 powders, respectively. The morphology and structure of the product were characterized by scanning electron microscopy and X-ray diffraction. Under the irradiation of 11 W visible light, the organic dye methylene blue was photocatalytically degraded with WO_3 / DWCNTs and WO_3 powders respectively. The UV-Vis absorption spectra of the samples were measured by UV-Vis spectrophotometer and the photocatalytic activity was calculated by Lambertil’s law Degradation rate. When the illumination time is 30 min, the degradation rate of WO_3 / DWCNTs is 87.50% and the degradation rate of pure WO_3 is only 25.39%. The results showed that the addition of DWCNTs can effectively inhibit the agglomeration of particles, reduce the particle size, increase the specific surface area of WO3, enhance the adsorption capacity of WO3, and significantly improve the photocatalytic degradation efficiency of WO3 on methylene blue.