羟基丁二酸对α－Fe_2O_3单分散溶胶的絮凝──稳定性

Effect of hydroxybutanedioic acid on the stability of monodispersed hematite sol

研究了羟基酸系列之一的羟基丁二酸（苹果酸）体系对α－Ｆｅ＿２Ｏ＿３单分散溶胶稳定性的影响，讨论了该体系的絮凝机理．实验表明：①羟基丁二酸对α－Ｆｅ＿２Ｏ＿３溶胶的聚沿作用有别于一般电解质．②影响该体系的絮－稳定性的主要因素是体系的酸度和絮凝剂浓度．③羟基丁二酸对α－Ｆｅ＿２Ｏ＿３单分散溶胶的絮凝和再稳定是受表面化学反应所控制．属于特殊吸附絮凝．

The effect of hydroxybutanedioic acid on the stability of monodispersed hematite sol was studied and the mechanism of coagulation is discussed. The re-sults indicate that:(1) hematite sol are coagulated in the hydroxybutanedioic acid which is diffenent from normal electrolytes.(2)main factors to affect the coagula-tion-stability of the sol are acidity of the system and concentration of coagulating agent.(3)coagulation and stability of monodispersed hematite in the hydroxybu-tanedioic acid are controlled by surface chemical reaction. The mechanism of coag-ulation is typical adsorption coagulation.