超重力场中纳米TiO_2粒子表面包覆Al_2O_3膜及其表征  

Characterization and surface modification of TiO_2 nanoparticles with alumina in IS-RPB

作　　者：刘有智[1,2] 郭雨[1,2] 石国亮[1,2] 董秀芳[1,2] 李裕[1,2] 

机构地区：[1]山西省超重力化工工程技术研究中心 [2]中北大学化学工程技术研究中心,太原030051

出　　处：《化工进展》2006年第3期310-314,共5页Chemical Industry and Engineering Progress

基　　金：山西省高校科技研究开发项目(No.20041221);山西省自然科学基金资助项目(No.20051015)

摘　　要：基于异相表面成核和撞击流-旋转填料床反应器的微观混合原理,以纳米水合氧化钛(TiO2·nH2O)粒子为固相基体,六水氯化铝溶液为包覆相,采用液相包覆-界面反应的方法在纳米TiO2前体颗粒表面包覆了纳米Al2O3膜,并对超重力场中纳米粒子表面包覆过程进行了初步分析。通过IR、TEM、Zeta电位分析和XRD分析,证实了纳米TiO2前体颗粒表面包覆了一层厚约5nm的致密海绵状膜。IR和XRD谱图表明,在Al2O3纳米膜层和纳米TiO2颗粒之间的界面上形成了Ti—O—Al键,包覆膜层的晶体结构以γ-Al2O3为主的混合晶型。Based on the principle of heterogeneous nucleation and micro-mixing in the impingingstreamrotating packed bed （IS- RPB） reactor, the liquid phase cladding and interfacial reaction was adopted to prepare γ - Al2O3/TiO2 nanopowder by using nanometric TiO2 · nH2O particles as base material and AlCl3 · 6H2O solution as cladding phase. The dispersion and the liquid - solid mixing of nanoparticles in the high gravity field in the IS -RPB reactor were also discussed. According to the spectra of FTIR, TEM Zeta and XRD, it was inferred that the Ti- O- Al bond was formed at the interface of the coating layer and the surface of nanosized TiO2 particles. The thickness of Al2O3 membrane with sponge structure was about 5nm.

关 键 词：撞击流-旋转填料床 包覆 纳米氧化钛 

分 类 号：TQ134[化学工程—无机化工]