Al3+掺杂对硅胶吸附材料性能的影响

将陶瓷纤维纸用水玻璃和铝盐溶液等浸渍制备出新型Al3 掺杂硅胶吸附材料,研究了Al3 掺杂对硅胶吸附材料性能的影响.傅立叶变换红外谱、扫描电子显微镜及X射线能谱(SEM-EDS)揭示吸附材料中掺杂Al3 的存在及其含量;多孔介质孔隙分析显示,一定程度的Al3 掺杂可提高材料的比表面积和孔容,影响其孔径结构及分布,增加活性吸附位,从而提高了材料的吸附性能,在材料表面形成的Al-O-Si键增强了材料表面孔道骨架支撑力,提高了表面导热性,使其耐热性能、耐破指数和裂断长显著提高.

Influence of Al{3+} doping on performance of silica gel adsorptive materials

AI3+ doped silica gel adsorptive materials were obtained by treating ceramic fiber matrix with sequential impregnation of aqueous solution of sodium silicate (Na2SiO3), aluminum salt etc. FTIR spectra, scanning electron microscope and energy dispersive X-ray spectrometer analysis indicate the existence and percentage of doping AI3+ in the adsorptive materials. According to the results from porous medium surface area analyzer, several percent AI3+ doping leads to the increase of BET surface area and total pore volume ,which raises active sites for adsorption, and influences pore size and distribution on the surface of silica gel, so the adsorbing capacities of AI3+ doped silica gel are improved. The formation of the bond of Al-O-Si (AI3+ doping) results in the increase of supporting power and heat conductivity of pore framework of adsorptive materials, therefore, heat resisting property, tensile strength and burst index of AI3+ doped silica gel have been markedly enhanced.