采用吸附等温线法测定改性粘土表面酸总酸度

Measuring Surface Acidity of Modified Clay by Adopting Adsorption Isotherm

探讨用不同强度的正丁胺、3-甲基吡啶、吡啶等测定改性粘土表面酸总酸度的方法．用Langmuir吸附等温式来拟合非酸中心部位对有机碱的吸附，排除了非酸中心部位吸附的影响．可用于实际改性粘土体系的表面酸总酸度测定，是一项简捷的粘土表面酸测试新方法，其终点不受样品本身颜色的影响．

For measuring total acidity of surface acid on modified clay, the authors present a method of appliyng organic bases such as n-butylamine, 3-picoline and pyridine of different strength. Langmuir adsorptionisotherm is used for the fittings of the adsorption of organic bases on the non-acid central sites, by which theeffect of the adsorption on the non-acid central sites can be rejected. The method is a forthright new methodfor measuring surface acid of clay, with an end point resisting the influence of the color of the sample. It issuited to measure total acidity of surface acid on actual modified clay system.