纳米Zn/ZnO复合结构的制备及其暗室催化性能  

Synthesis of Zn/ZnO nano-composite and its dark room catalytic effect

作　　者：赵立峰[1] 王树林[2] 夏立珍[1] 邱迎新[1] 蹇敦亮[2] 崔貌[1] 田汇泉[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093 [2]上海理工大学材料科学与工程学院,上海200093

出　　处：《功能材料》2013年第8期1106-1109,共4页Journal of Functional Materials

基　　金：国家教育部博士点基金资助项目(20113120110005);上海市科委纳米专项资助项目(1052nm02900);上海市研究生创新基金资助项目(JWCXSL1102)

摘　　要：利用滚压振动磨在室温条件下将金属锌粉制备成尺寸在20～30nm的Zn颗粒,在260℃预热纳米Zn颗粒并使其与常温常压水蒸气反应生成ZnO与Zn的复合结构。将水解产物作为催化剂在完全避光的暗室条件下对甲基橙进行降解实验,在60min内甲基橙的降解率即可达到80%以上,说明这种纳米ZnO/Zn复合结构对甲基橙具有优异的暗室催化效果,且反应过程符合拟一级动力学方程。分析其原因可能为机械力作用使得纳米结构内部存在大量晶格缺陷,形成电荷不均匀区域,并以电子空穴对的形式存在。同时在水解反应过程中,未反应的Zn颗粒附着在ZnO纳米棒上,形成金属-半导体复合结构,可有效降低电子空穴的复合几率,从而增大ZnO纳米结构的催化效率。Roller vibration milling was used to manufacture zinc nanoparticles of 20-30nm at room temperature. The product was preheated at 260℃ and hydrolyzed with normal steam to obtain hybrid of ZnO and Zn nano-structures. The hybrid structures were put as catalyst into the methyl orange solution in darkroom at ambient temperature, a decomposition degree 80% was obtained after 60 min. The hydrolysate＇s catalytic effect to methyl orange is excellent and the process is according with the pseudo-first-order kinetics equation. The reason of the degradation phenomenon maybe the lattice defects formed by the mechanical force to zinc powder, in the hydrolysis reaction process, these internal defects may not disappear and exist in the form of electron-hole pair. At the same time, un-reacted zinc powder is attached to the zinc oxide nanorods becoming the metal-semiconductor structures. These metal-semiconductor structures decrease the composition of the electron-hole pair effectively, increasing the catalytic efficiency signally.

关 键 词：滚压振动磨 纳米结构 水解反应 暗室催化 甲基橙 

分 类 号：TB33[一般工业技术—材料科学与工程]