La_2O_3对ZnO-SiO_2纳米复合物结构性能的影响  

Effect of La_2O_3 on Structure Properties of ZnO-SiO_2 Nanocomposites

作　　者：王新[1] 赵新强[1] 王延吉[1] 张继炎[2] 

机构地区：[1]河北工业大学化工学院绿色化工研究所,天津300130 [2]天津大学化工学院催化科学与工程系,天津300072

出　　处：《材料科学与工程学报》2004年第4期531-533,共3页Journal of Materials Science and Engineering

基　　金：国家自然科学基金 (2 0 1 760 0 8);河北省自然科学基金(2 0 2 0 0 6)资助项目

摘　　要：采用溶胶—凝胶法制备了ZnO SiO2 和ZnO La2 O3 SiO2 复合物 ,通过TEM分析发现其均为纳米颗粒 ,平均粒径分别为 4 5nm和 35nm ;通过比表面及孔径分布测定发现ZnO SiO2 的比表面积高达 715 .5m2 g,La2 O3的加入使其比表面积骤减至 14 2 .5m2 g,平均孔径增大近 4倍 ,孔容减小。此外 ,ZnO SiO2 的孔径分布较窄 ,从 1.7nm到 15nm ,而ZnO La2 O3 SiO2 的孔径分布变宽 ,从 1.7nm到 90nm ,大多数孔集中在 15 .5 6nm左右。通过XRD和XPS分析发现ZnO、La2 O3和SiO2 之间存在着较强的相互作用。Nanocomposites of ZnO-SiO 2 and ZnO-La 2O 3-SiO 2 have been prepared by sol-gel process. TEM photographs show that all of them are nano-meter sized particles; average particle diameters are 45nm and 35nm respectively. The specific surface area of ZnO-SiO 2 nanocomposite is 715.5m 2/g. The addition of La 2O 3 into ZnO-SiO 2 nanocomposite makes the specific surface area lessen sharply to 142.5m 2/g, the average pore size increase almost 4 times and the pore volume decrease. The pore diameter of ZnO-SiO 2 nanocomposite ranges from 1.7 nm to 15nm, while the pore size distribution of ZnO-La 2O 3-SiO 2 nanocomposite gets much wider, ranging from 1.7nm to 90nm, and most of the pores are around 15.56nm. XRD and XPS analyses prove that there are strong interactions among ZnO, La 2O 3 and SiO 2.

关 键 词：溶胶-凝胶法 ZnO-SiO2 LA2O3 纳米复合物 结构性能 纳米粒子 

分 类 号：TB383[一般工业技术—材料科学与工程]