纳米四针状氧化锌晶须光催化降解甲基橙  

Photocatalytic properties of nano tetrapod-like zinc oxide whiskers

作　　者：周建萍[1] 傅万里[1] 丘克强[2] 陈启元[2] 

机构地区：[1]南昌航空大学材料学院,南昌330063 [2]中南大学化学化工学院,长沙410083

出　　处：《功能材料与器件学报》2007年第3期195-201,共7页Journal of Functional Materials and Devices

摘　　要：以纳米四针状氧化锌晶须(T-ZnOw)为光催化剂,以甲基橙为染料模型化合物,研究了T-ZnOw的光催化氧化降解性能。考察了甲基橙溶液的初始浓度、催化剂用量和粒径等因素对光催化氧化降解反应的影响。研究结果表明,纳米T-ZnOw光催化氧化降解甲基橙的反应遵循一级反应动力学规律;光催化剂纳米T-ZnOw的最佳用量为2g/L,此时经60min光催化降解后,甲基橙溶液的色度剩余率仅为8%;T-ZnOw粒子直径越小,光催化活性越高,效果越好。对比实验和重复实验结果表明,纳米T-ZnOw的光催化氧化降解效果比纳米TiO2和普通球形纳米ZnO粉体更好,是一种高效、长寿的光催化剂材料。Nano T- ZnOw was used as photocatalyst and its photocatalytic properties were explored with methyl orange as the model compound. The effects of the initial concentration of methyl orange, the content of the photocatalyst and its dimension on the photodegradation efficiency were systematically investigated. The results show that the photodegradation reaction follows the rule of first - order reaction. The optimal content of the photocatalyst, nano T - ZnOw, is 2g/L. Under this optimal loading of photocatalyst, the residual ratio of chrominance of the solvent is only about 8%. The catalysis activity is also found to increase with smaller root dimensions of the whiskers. The results of the comparison and repeating experiments indicate that nano T - ZnOw has better photodegradation effect and better stability than nano TiO2 and nano ZnO, indicating that nano T - ZnOw could be a more efficient and long - life photocatalyst with great application potential.

关 键 词：纳米四针状氧化锌晶须 甲基橙 光催化氧化 动力学规律 降解效率 

分 类 号：TN304[电子电信—物理电子学]