溶液吸附法测定改性煤矸石固体比表面积

The Determination of Specific Surface Area of The ModifiedCoal Gangue by Solution Adsorption Method

为了测定改性煤矸石固体比表面积,选取亚甲基蓝溶液和醋酸溶液两种不同的吸附质,通过溶液吸附法对改性煤矸石比表面进行测定.采取单分子层吸附方式,利用朗格缪尔(Langmuir)吸附等温式与弗罗因德利希(Freundlich)经验吸附等温式两种理论模型,分别线性拟合计算出改性煤矸石的饱和吸附量,进而求出其比表面积.结果表明,朗格缪尔吸附模型拟合结果与弗罗因德利希吸附模型的结果契合度很好,以亚甲基蓝作为吸附质,计算所得的改性煤矸石的比表面积最为理想.

The specific surface area of the modified coal gangue was investigated by the solution adsorption method using methylene blue solution and acetic acid solution as adsorbate,respectively.The monolayer adsorption method is adopted and two theoretical models,Langmuir and Freundlich adsorption isotherm equations,were used to calculate the saturation adsorption of the modified coal gangue by curve fitting method.Further,the specific surface area was calculated by the theoretical models of Langmuir and Freundlich adsorption isotherm equations,which accorded with each other.The result of the specific surface area using methylene blue solution as adsorbate is reasonable.