管状氧化锌的碱溶法合成及光催化降解亚甲基蓝的性能

Synthesis of Tubular ZnO Material and Photocatalytic Degradation of Methylene Blue

采用一种新颖、简单、环保的方法，在高浓度NaOH溶液中，n（Zn）∶n（NaOH）＝1∶30，于92℃下对已合成的棒状ZnO原料进行碱溶反应，获得了管状结构的ZnO．探讨其形成机理，发现材料的不同晶面性质不同，在碱中的溶解情况不同，导致管状结构形成，该法适用于具有类似性质的管状材料的合成．形成管状ZnO后材料的长径比缩小，均匀性增加，荧光发射增强，同时在可见区（400～800 nm）出现一定程度的吸收，这些现象说明形成管状结构后ZnO的比表面增加，表面性质发生一定程度的变化，表面及内部的缺陷性质和数目都有所改变．该管状ZnO材料用于光催化降解亚甲基蓝（MB），其降解效率明显增强，经1 h光照，MB的降解率由83.1％（棒状ZnO）增加到93.9％（管状ZnO）．

Using a novel , simple and environmental method , the tubular ZnO was synthesized by the reaction of rod ZnO raw material with sodium hydroxide （ NaOH ） solution at 92 ℃ for 3 h.The formation mechanism of tubular ZnO was discussed and the result showed that the differences of surface atomic structures result in a distinct chemi -cal ability to react with NaOH to form tubular structure .The tubular ZnO exhibits a lower length to diameter ratio , higher homogenization , and stronger fluorescence emission than ZnO raw material .Specially , the tubular ZnO ex-hibits an absorption in the region of 400-800 nm.The tubular ZnO possesses increased surface area , variational surface character , and incremental defects on the surface and in the interior .The photodegradation rate of methyl-ene blue （ MB） was 93.9%in tubular ZnO system , higher than 83.1%in rod ZnO system under 1 h irradiation.