超细氧化钨的制备及其光催化性能研究

以钨酸钠和盐酸为原料,碳纳米管为载体,采用一步法将钨酸颗粒直接沉积在碳纳米管管壁上,形成钨酸-碳纳米管(H2WO4-CNTs)复合物.或采用二步法将钨酸沉淀与碳纳米管复合,形成H2WO4-CNTs复合物.之后,在氧气气氛下进行煅烧,生成了氧化钨粉末.经物理性能测试,2种方法制备的H2WO4-CNTs复合物中钨酸颗粒的平均粒径分别为10 nm和100 nm.氧化钨粉末的平均粒径分别为250 nm和2μm,比表面积分别为36.53 m2/g和13.99 m2/g.采用紫外可见分光光度计测定了氧化钨的光催化性能,在11 W的日光灯照射下,当光照时间为30 min时,脱色率分别达到93.8%和79.1%.结果表明,一步法制备的氧化钨因具有更小的平均粒径和更大的比表面积,表现出更好的物理吸附性能和光催化性能.

Preparation and photocatalytic performance of ultrafine tungsten oxide

Sodium tungstate and hydrochloric acid are used as raw materials, carbon nanotubes as tem-plate, tungsten acid and carbon nanotube composite are prepared respectively by using one-step and two-step method, and then roasted at 600 ℃ for 2 h under oxygen atmosphere. The average particle size of tung-sten acid and carbon nanotubes composite prepared one and two step methods are 10 nm and 100 nm re-spectively. The average particle size of tungsten oxide powders are 250 nm and 2 μm respectively. The spe-cific surface area of tungsten oxide powders is 36.53 m2/g and 13.99 m2/g respectively. The photocatalytic performance of tungsten oxide is studied by the UV-Vis spectrophotometer using 11W fluorescent light as the light source. The degradation rate of tungsten oxide powders can reach 93.8 % and 79.1 %. The physical ab-sorption and photocatalytic activity of tungsten oxide prepared by one-step method is better than that of two-step method because of its smaller particle diameter and higher specific surface area.