缺氧型钨氧化物纳/微米结构的制备及其光催化性能

Synthesis,Characterization and Photocatalytical Properties of Oxygen-deficient Tungsten Oxide Nano/micro-structures Prepared by Simple Thermal Evaporation

通过在真空管式炉中不同条件下加热氧化钨粉末和硫粉末制备了深绿色的WO_3微米颗粒、深蓝色的WO_(2.9)纳米棒和深紫色的W_(19)O_(55)纳/微米板条,并选用亚甲基蓝溶液作为目标降解物模拟污水处理测试了材料的光催化性能。研究发现,在相同条件下,所制备的3种钨氧化物纳/微米结构中W_(19)O_(55)纳/微米板条具有最好的光催化效果,且钨氧化物纳/微米结构的光催化性能与其氧缺陷程度和比表面积有关。

Three kinds of monoclinic tungsten oxides nanostructures with controlled composition were synthesized via simple thermal evaporation of WO_3 and S powders at 1000~1050 ℃ in a tube furnace, including dark green WO_3 microparticles, dark blue WO_(2.9) nanorods, and dark purple W_(19)O_(55) nano/micro-laths. And their photocatalysis to methylthionine chloride solutions under natural light was investigated. It is indicated that such photocatalysis is relevant to the oxygen vacancy and specific surface area of the tungsten oxides catalysts, and in the three kinds of tungsten oxides, W_(19)O_(55) nano/micro-laths present the highest photocatalytical activity under the same experimental conditions.