以离子液体为铝源和模板合成氧化铝纳米纤维  

Synthesis of Al_2O_3 Nanofibers with Ionic Liquids as Both the Template and Aluminum Source

作　　者：刘团春 唐韶坤[1] 纪晓伟 韩培[1] 

机构地区：[1]天津大学化工学院,绿色合成与转化教育部重点实验室,天津化学化工协同创新中心,天津300072

出　　处：《高等学校化学学报》2016年第5期817-821,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21328601,21206118);中国石油科技创新基金(批准号:2013D-5006-0402)资助

摘　　要：以咪唑类氯铝酸盐离子液体(x Al Cl_3-[C_(10)mim]Cl)为模板和铝源,采用溶胶-凝胶法合成了氧化铝纳米纤维.考察了氯铝酸盐离子液体中Al Cl_3的摩尔分数以及焙烧温度对纤维状氧化铝合成的影响,通过X射线衍射仪(XRD)、场发射透射电子显微镜(TEM)和物理吸附仪对样品进行了表征.研究结果表明,氯铝酸盐离子液体可以同时作为模板剂和铝源合成具有一定形貌的氧化铝.当Al Cl_3的摩尔分数x(Al Cl_3)=0.5时,可以合成出纳米纤维状氧化铝,纳米纤维直径约为2 nm,长度约为200 nm,比表面积为238.38 m^2/g,孔容为0.54 cm^3/g,平均孔径为8.43 nm.合成的氧化铝具有高的热稳定性,在900℃下焙烧依然能够很好地保持其形貌结构和γ晶型.此外,提出了氢键共π-π键堆积机理来解释超细纤维氧化铝的合成过程.Al_2O_3nanofibers were synthesized with aluminum chloride acid type ionic liquids x Al Cl_3-[C_（10）mim]Cl（ [C_（10）mim]Cl is 1-decyl-3-methylimidazolium chloride,x is the molar fraction of Al Cl_3 in the ionic liquid） as both the template and aluminum source via sol-gel method. The effects of the molar fraction of aluminum chloride acid and calcination temperature on the alumina morphology were mainly studied. The obtained products were characterized by means of X-ray diffraction（ XRD）,transmission electron microscopy（ TEM） and N_2adsorption-desorption. The results suggested that x Al Cl_3-[C_（10）mim]Cl could act as not only the aluminum sources but also the template to control the alumina morphology. When the molar fraction of aluminum chloride acid was 0.5,Al_2O_3 nanofibers could be synthesized with the diameter of 2 nm,the length of about 200 nm,the surface area of 238.38 m2/g,the pore volume of 0.54 cm3/g and the mean pore diameter of 8.43 nm. The Al_2O_3 nanofibers could maintain the fiber morphology and γ-Al_2O_3 crystalline phase even under 900 ℃,indicating that the Al_2O_3 nanofibers had relatively high thermal stability. Furthermore,the hydrogen bond-co-π-π stack mechanism was proposed to explain the formation of Al_2O_3 nanofibers.

关 键 词：离子液体 模板 铝源 氧化铝 纳米纤维 

分 类 号：O611.62[理学—无机化学]