H_2Ti_4O_9纳米晶的制备与表征  

Preparation and Characterization of H_2Ti_4O_9 Nanocrystals

作　　者：王金淑[1] 李辉[1] 殷澍[2] 佐藤次雄[2] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022 [2]东北大学多元物质科学研究所,日本仙台98085771

出　　处：《无机材料学报》2007年第5期843-846,共4页Journal of Inorganic Materials

基　　金：北京市教育委员会科技发展计划资助项目(KM200610005010);教育部新世纪优秀人才计划项目

摘　　要：采用机械化学法,利用离子交换反应,通过离子交换、层离和沉淀过程制备了高比表面积的H_2Ti_4O_9纳米晶体.采用XRD、TEM、热分析、N2吸附-脱附等温过程和吸收光谱对制备的H_2Ti_4O_9纳米晶体进行了表征.结果表明,以TiO_2纳米晶片形式存在的微晶Ti_4O_9^(2-),其径向尺寸低于50nm,纳米晶片的比表面积取决于反应溶液的pH值和对前驱物K_2Ti_4O_9球磨的时间.将K_2Ti_4O_9球磨2h后悬浮于1mol/L HCl溶液中搅拌,进行离子交换反应,最后将溶液pH值调整至8,沉淀后所得产物H_2Ti_4O_9的比表面积达328.4m^2·g^(-1).H2Ti4O9 nanocrystals with high specific surface areas were prepared by delamination and precipitation process through ball milling combined with ion exchange reaction. The samples were characterized by X-ray powder diffraction, transmission electron microscope, thermal analysis, N2 adsorption-desorption isotherm, and absorption spectrum. The crystallites of Ti4O^2- 9 in the form of titania nanosheets have lateral size less than 50nm. The specific surface area of H2Ti4O9 nanocrystals depends on pH values of precipitation solution and ball milling time. The specific surface area of H2Ti4O9 nanocrystals prepared by ball-milling of K2Ti4O9 for 2h and suspending in lmol/L HC1 followed by precipitation at pH=8 can reach 328.4m^2·g^-1.

关 键 词：H2Ti4O9 纳米晶 球磨 离子交换 

分 类 号：O614[理学—无机化学] TB383[理学—化学]