利用“插入”技术 ,对蒙脱土进行了表面改性研究 .制备出阳离子粘土 ,考察了制备温度、镁离子浓度等条件对其表面电性以及改性粘土对赤潮异弯藻 (Heterosigmaakashiwo)絮凝作用的影响 .结果表明 ,该阳离子粘土对赤潮生物有较强的絮凝作用 ,改性后粘土用量减少至原来的 1 / 5～ 1 / 1 0 .其表面正电性与赤潮异弯藻去除率呈正相关 ,与理论模型一致 . The surface modification of montmorillonite was carried out using “insert” technology.The cationic clay was prepared and the effects of preparation temperature, concentration of magnesium ion and so on on the surface electrical properties and the effect of modified clay on Heterosigma akashiwo flocculation The results showed that the cationic clay had a strong flocculation effect on red tide organisms and the amount of modified clay decreased to 1/5 ~ 1/10. The surface electropositive and the removal rate of Heterosigma akashiwo Was positively correlated with the theoretical model.