水解锌纳米结构对甲基橙的光催化降解

Photocatalytic performance of hydrolyzated zinc nano-structures to decompose methyl orange

利用滚压振动磨在干法室温条件下将金属锌制备成为尺度大约在3～5nm的锌量子点,并使产物与水蒸气在不同温度下进行化学反应,得到纳米氧化锌或纳米氧化锌与锌的混合物。在250℃反应温度下得到的产物具有最好的分散性,其特征是棒状和片状结构共存,而且纳米棒具有显著的沿着[0,1,-1,1]晶向的生长趋势。在几个不同水解温度得到的产物中,这种纳米结构对甲基橙的光催化降解效率最高,在距离30cm的30W紫外灯照射下,在30min内降解了95%,1h则几乎完全降解。而在阳光照射下,15min内甲基橙的衰减率就达到95%,30min则几乎完全降解。这种优异的催化性能主要归功于产物的特殊结构和形貌,为提高金属及其氧化物纳米结构对有机染料的降解提供了一条新途径。

Roller vibration milling was used to manufacture zinc quantum dots of 3-5 nm in dry. mode and at room temperature, and the product was hydrolyzed with steam at different temperatures to obtain ZnO or hybrid of ZnO and Zn nano-structures. The nano-structures synthesized at 250℃ had the highest dispersivity featuring nano-flakes with nano-rods, that grew along the [0, 1, -1, 1] direction. Among samples produced at different temperatures, the nano-structures had the best photocatalytic performance to degrade methyl orange in water. Exposing the solution of methyl orange with the catalyst to a UV source light of 30 W with a distance of 30 cm for 30 min, a decomposition degree 95% was obtained, and after 1 h the dye was almost totally decomposed. When it was placed in the sun for 15 min and 30 min, the degradation reached 95% and about 100% respectively. The findings provide a new way to enhance the decomposition of dye wastewater by nano-structures.