硅铝酸盐纳米材料的制备及其碱性研究

发布时间：2018-01-20 10:30

  本文关键词： 水热辅助溶胶-凝胶法 多孔材料 一维材料 强碱复合材料 制备　出处：《华南理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以勃姆石合成的铝溶胶为铝源,以硅酸钠制备出的硅溶胶为硅源,采用水热辅助溶胶-凝胶的化学方法,制备出颗粒状多孔性、长方体多孔性及一维状三种不同形貌的硅铝酸盐纳米材料,三种纳米材料的形貌规整、颗粒小而均匀、比表面积大、碱性强、热稳定,并研究了煅烧时间及煅烧温度对固体样品的形貌及结晶度的影响,确定了三种不同形貌硅铝酸盐纳米材料的制备工艺条件。本文还研究了以第三章合成的硅铝酸盐材料为基础,采用了共生法的掺杂方式,以KNO3对其进行掺杂增强其碱性的研究,合成了碱性更强、碱量更大、晶型规整、碱强度中心更加专一的强碱性硅铝酸盐复合材料。并系统地研究了碱性改良剂的种类、掺杂量、掺杂方式、煅烧时间、煅烧温度等工艺参数对硅铝酸盐复合材料碱性的影响,得到了制备强碱性硅铝酸盐复合材料的优化工艺条件为:碱性改良剂为KNO3,掺杂量为7.5%,掺杂方式为共生法,煅烧温度为600℃,煅烧时间为14 h。采用X射线衍射分析(XRD)、X射线荧光分析(XRF)、电子扫描显微镜(SEM)、Hammett指示剂法、苯甲酸-氢氧化钠返滴定法、CO2程序升温脱附(CO2-TPD)、傅里叶变换红外光谱(FTIR)、热重-差示扫描量热法(TG-DSC)等表征方法,系统地研究了三种不同形貌的硅铝酸盐纳米材料及硅铝酸盐复合材料的结构、组成及性能。
[Abstract]:In this paper, the granular porous properties were prepared by hydrothermal assisted sol-gel chemical method using the aluminum sol synthesized by Bohm stone as the aluminum source and the silica sol prepared by sodium silicate as the silicon source. Cuboid porous and one-dimensional three different morphology of aluminate nanomaterials, the morphology of the three nanomaterials, small and uniform particles, large surface area, strong alkaline, thermal stability. The effects of calcination time and calcination temperature on the morphology and crystallinity of solid samples were studied. The preparation conditions of three kinds of aluminosilicate nanomaterials with different morphologies were determined. Based on the aluminosilicate materials synthesized in Chapter 3, the doping method of symbiosis was adopted. The alkalinity was enhanced by doping with KNO3. The results showed that the alkalinity was stronger, the amount of alkali was larger, and the crystal structure was regular. The alkali strength center is more specific to the strong alkaline aluminosilicate composite. The types, doping amount, doping mode and calcination time of alkaline modifier are systematically studied. The effect of calcination temperature on the alkalinity of aluminosilicate composites was studied. The optimized process conditions were obtained as follows: the basic modifier was KNO3 and the doping amount was 7.5%. The doping method is symbiosis method, calcination temperature is 600 鈩，

本文编号：1447860