纳米AlOOH(Al_2O_3)的合成及表面性质研究  

SYNTHESIS AND SURFACE PROPERTIES OF NANOSTRUCTURE AlOOH(Al_2O_3)

作　　者：季洪海[1] 苗升[2] 沈智奇[1] 凌凤香[1] 

机构地区：[1]中国石化抚顺石油化工研究院,辽宁抚顺113001 [2]中国石化胜利油建工程有限公司

出　　处：《石油炼制与化工》2014年第1期42-46,共5页Petroleum Processing and Petrochemicals

基　　金：中国石油化工股份有限公司合同项目(112099)

摘　　要：以AlCl3·6H2O为铝源、NaOH为沉淀剂,采用水热合成法制得AlOOH纳米棒和纳米片,焙烧后得到相同形貌的Al2O3。通过X射线衍射、透射电子显微镜、傅里叶变换红外光谱对样品进行表征。结果表明:所制样品为γ-AlOOH,焙烧后转变为γ-Al2O3,结晶度高,每个纳米棒及纳米片均为单晶;n(OH-)?n(Al 3+)对AlOOH和Al2O3的形貌有较大影响,随着n(OH-)?n(Al 3+)的增大,AlOOH的长径比逐渐减小,最终成为纳米片;Al2O3纳米棒表面有2种类型的羟基,分别归属于(110)晶面HO-2μ-AlⅥ和(100)晶面HO-3μ-AlⅥ,Al2O3纳米片表面有4种类型的羟基,分别归属于(111)晶面HO-3μ-AlⅥ、HO-2μ-AlⅥ和(110)晶面HO-2μ-AlⅥ和HO-3μ-AlⅥ。The AlOOH nanorods and nanoflakes were prepared via hydrothermal synthesis using AlC13 ~ 6H20 and NaOH. They were further converted into Al203 with same shape after calcina- tion. Several techniques such as X-ray diffraction （XRD）, transmission electron microscopy （TEM） and Fourier-transform infrared （FTIR） measurements were used to characterize the products. The results show that the products are γ-AlOOH which can be converted into ,/-Al2（）3 after calcinations. All the nanocrystals are single crystal with high crystallinity. The ratio of n（OH-）/n（Ala＋） has a great influ- ence on the shape of AlOOH and Al203. With the n（OH-）/n（Al3＋）increasing, the ratio of length to di- ameter decreases for AlOOH which finally become nanoflakes. There are two types of OH groups on 3,-AlzO3nanorod, i. e HO-μ2AlⅥ of Al203 （110） crystal plane and HO μ2-AlⅥ of Al2O3 （100） crystal plane, respectively. There are {our types of OH groups on γ-Al2O3nanoflake. They are HO-μ3-Alvl and HO--μ3-AlⅥ of Al2O3 （111） crystal plane and HO--μ2 Alv^and HO-μ3-Alu of Al2O3 （110） crystal plane.

关 键 词：纳米棒 纳米片 n(OH) n(Al3+) 表面性质 

分 类 号：TB383.1[一般工业技术—材料科学与工程]