聚合氯化铝制备拟薄水铝石及γ-Al_2O_3的研究Ⅱ——表面活性剂影响探讨  

Preparation of Pseudo-boehmite and γ-Al_2O_3 by Polyaluminum Chloride Ⅱ——Surfactant Influences

作　　者：王园园[1,2] 赵长伟[2] 何劲松[2] 闫勇[2] 张香兰[1] 栾兆坤[2] 

机构地区：[1]中国矿业大学化学与环境工程学院,北京100083 [2]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085

出　　处：《无机化学学报》2012年第2期302-306,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21076219);教育部留学回国人员科研启动基金(No.ITLXHG2009071702);环境水质学国家重点实验室专项经费(No.09Y02ESPCR)资助项目

摘　　要：本实验采用自制的聚合氯化铝溶液为原料,利用溶胶-凝胶法制备拟薄水铝石及其衍生物γ-Al2O3,采用XRD、TEM和N2吸附法对样品进行表征和分析,探讨了不同pH值、不同合成温度以及不同pluronic表面活性剂对产物结构性质的影响。结果表明:当pH值为8.5时水合氧化铝以拟薄水铝石为主;当温度为70℃时制备的产物为拟薄水铝石晶相。随着表面活性剂L64、L65和F68分子量的增加,生成的拟薄水铝石及其衍生物γ-Al2O3的物相结晶度升高,但产物的晶相没有改变。所制备的拟薄水铝石在500℃焙烧6 h后均得到γ-Al2O3,其中表面活性剂为L65时扩孔效果最佳,比表面积、孔容和孔径分别为231 m2.g-1、0.28 cm3.g-1和4.52 nm。Pseudo-boehmite and its derivative γ-Al2O3 were prepared from polyaluminum chloride by sol-gel method.The samples were characterized by XRD,TEM and N2 adsorption-desorption techniques.Effects of pH value,preparation temperature and species of pluronic surfactants on the physical properties of pseudo-boehmite were investigated.Results show that alumina hydrate is mainly pseudo-boehmite prepared at pH value near 8.5 and at temperature value near 70 ℃.With the increase of pluronic surfactants molecular weight,the degree of crystallinity of pseudo-boehmite and its derivative γ-Al2O3 increases.It is proved that phases of products do not change after adding the pluronic surfactants L64,L65 and F68.The γ-Al2O3 phases are obtained after 6 hours calcination of the pseudo-boehmite at 500 ℃.L65 is the most suitable for increasing surface area of γ-Al2O3,surface area of 231 m2·g-1,pore volume of 0.28 cm3·g-1 and pore size of 4.52 nm was obtained.

关 键 词：聚合氯化铝 拟薄水铝石 γ-AlO PLURONIC 

分 类 号：O614.31[理学—无机化学] TQ426.65[理学—化学]