介孔氧化锌的微乳液法制备及表征

Preparation and Characterization of Mesoporous ZnO by Microemulsion Method

以十六烷基三甲基溴化铵(CTAB)/苯乙烯/硝酸锌溶液/过硫酸钾组成的聚苯乙烯微乳液为模板,提出一种制备介孔氧化锌的简易方法,研究了煅烧温度对介孔氧化锌结构特性的影响,提出了介孔形成的可能机制。结果表明:煅烧温度较高时,所得介孔氧化锌的孔径较大,比表面积较小;当煅烧温度为500℃时,所得纳米氧化锌的比表面积为11.013 m2.g-1,孔容为0.135 cm3.g-1,介孔分布在40.2 nm左右。此外,光催化降解亚甲基蓝的实验表明所制备的介孔ZnO具有较高的光催化性能。

A simple route to synthesize mesoporous ZnO nanoparticle was proposed using polystyrene microemulsion system composed of cetyltrimethylammonium bromide（CTAB） /styrene（ST）/zinc nitrate/ammonium persulfate（AP）.The effect of calcining temperature on the structures characteristic of the synthesized mesoporous ZnO was investigated,and the possible mechanism of pore formation was proposed.The results showed that as the calcining temperature is higher,the pore of the as-prepared ZnO is bigger,and the specific surface area is smaller.The specific surface area,pore volume and pore size distribution of the synthesized mesoporous zinc oxide calcined at 500 ℃ are 11.013 m^2/g,0.135 cm^3/g and 40.2 nm,respectively.Moreover,the photodegradation of methylene blue was carried out using mesoporous zinc oxide as photocatalyst,and all the synthesized mesoporous zinc oxide exhibited high photocatalytic activity.