高岭石-纳米锌复合物的制备与表征  

Preparation and characterization of kaolinite-nano zinc compound

作　　者：杨丹[1,2] 袁鹏[2] 朱建喜[2] 

机构地区：[1]仲恺农业工程学院化学化工学院,广东广州510225 [2]中国科学院广州地球化学研究所,广东广州510640

出　　处：《化工矿物与加工》2011年第5期10-13,共4页Industrial Minerals & Processing

基　　金：国家自然科学基金项目(40672036;20976204);仲凯农业工程学院校级科研基金(G2360311)

摘　　要：以高岭石-二甲基亚砜（Kao-DMSO）为前驱体，硼氢化钠或柠檬酸钠为还原剂，用原位合成法将锌离子还原为零价锌，并负载于高岭石层间或表面。采用X射线衍射（XRD）、X射线光电子能谱（XPS）和透射电镜（TEM）等手段对高岭石-纳米锌复合物进行表征。结果显示：纳米锌粒子的尺寸和形态与原料配比和所使用的还原剂有关，Zn^2＋与Kao—DMSO质量比越大，得到的纳米锌颗粒越大；以柠檬酸钠作还原剂，制得的纳米锌颗粒呈球形，粒径较小，样品粒径约为20～30nm；用硼氢化钠作还原剂，制得的纳米锌颗粒呈长锥形，颗粒粒径较大。XPS分析显示，负载在高岭石表面的锌主要以零价锌形式存在。Zinc nanoparticles were synthesized in situ growth in the interlayer space and the exterior surface of kaolinite by using kaolinite-dimethyl sulphoxide（Kao-DMSO） as precursor, and by using sodium borohydride and sodium citrate as reducing agent. These kaolinite-nano zinc composites were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and transmission electron microscopy （TEM）. The results showed that the size and morphology of nano zinc depended on both the proportion of Zn^2 ＋ to Kao-DMSO and the reduction method. According to TEM images, Zn nanoparticles increased with the proportion of Zn^2＋ to Kao-DMSO. The zinc nanoparticles prepared by using sodium citrate as reducing agent were nearly spherical with a size near 20 - 30 nm. While the zinc nanoparticles pre- pared by using sodium borohydride as reducing agent did not appear spherical but displayed large-sized long shape particles with a big end and other small end. XPS results confirmed the presence of metallic. Zn nanoparticles on the surface of kaolinite.

关 键 词：高岭石 纳米锌 零价金属 

分 类 号：TB383[一般工业技术—材料科学与工程]