黏土中层状硅酸盐矿物对聚羧酸减水剂的吸附

Adsorption Capacity of Clay Layered Silicate Minerals on Polycarboxylate Superplasticizer

采用凝胶渗透色谱分析和比较了高岭土、伊利土、蒙脱土对聚羧酸减水剂(PCE)的吸附量。结果表明,蒙脱土对PCE有强吸附作用。当PCE为2.00 g/L的标准掺量时,蒙脱土的吸附量为7.18 mg/g,而高岭土和伊利土的吸附量仅为2.01 mg/g和4.59 mg/g。并且蒙脱土的吸附量随PCE质量浓度的增大和温度的提高而快速增大。碱性条件3种矿物的吸附量减小,其中蒙脱土表现尤为明显。体系中Ca^(2+)、Mg^(2+)特别是Mg^(2+)的存在会明显增大蒙脱土对PCE的吸附量,但对高岭土和伊利土的吸附量没有明显影响。

The adsorption capacity of kaolinite, montmorillonite, and illite on polycarboxylate superplasticizer （PCE） were analyzed by Gel Permeation Chromatography （GPC）. The result shows that montmorillonite has a remarkable adsorption capacity on PCE. When the concentration of PCE was 2.00 g/L, the adsorption capacity of kaolinite and illite were only 2.01 mg/g and 4.59 mg/g, while the montmorillonite reached 7.18 mg/g. In addition, with the increase of PCE concentration and temperature, the adsorption capacity of montmorillonite increased rapidly. The adsorption capacity of kaolinite, montmorillonite, and illite decreased in basic condition, especially the montmorillonite. The adsorption capacity of montmorillonite was increased sharply with the presence of Ca^2＋, Mg^2＋, especially Mg^2＋, but they had no significant effect on kaolin and iUite.