【摘要】 应用溶胶-凝胶法制备了SiO₂/SnO₂复合凝胶,测定了红外光谱,采用静态吸附法测定了不同组成的SiO₂/SnO₂复合凝胶对丙酮气体和氨气的吸附动力学曲线。结果表明,SiO₂与SnO₂凝胶的复合有利于气体的吸附,在凝胶中含有一定的羟基是吸附性强的根源。数据拟合得到的吸附动力学方程分别为x=c₁(1-exp（-c₂t）和x=c′₁t/（1+c′₂t）的形式,说明SiO₂/SnO₂复合凝胶对丙酮气体和氨气的吸附机理分别具有单活性位和双活性位吸附特征。更多还原

【Abstract】 SiO2/SnO2 gels were prepared by sol gel method.The chemical structures of the gels were characterized by FT-IR spectra.The adsorption dynamical curves to acetone and ammonia gases by SiO2/SnO2 gels were measured.The results show that the composite of SiO2 with SnO2 favours adsorption of ammonia and acetone gases.The fitted eqviations of the adsorption dynamical curves have the form of x = c1(1-exp(-c2t))and x= c’t/(1+c’2t).It is demonstrated that the adsorptioin mechanism of gels involves single or two active site adsorption.更多还原