给不用硫酸铁制备氢氧化铁胶体加几个注释

Some Notes on Preparing Ferric Hydroxide Colloid without Using Ferric Sulfate

通过对Fe_2（SO_4）_3的水溶性和用FeCl_3溶液制备Fe（OH）_3胶体分散系中的成分及硫酸盐（SO_4^（2-））对Fe（OH）_3胶体稳定性的影响的分析,得出不宜用Fe_2（SO_4）_3制备Fe（OH）_3胶体的原因是SO_4^（2-）比Cl-较易被界面吸附,所以在溶剂化层内的负电荷数增加,扩散层内的负电荷数减少,扩散层变薄,Fe（OH）_3胶粒相互碰撞容易发生聚沉。

This paper analyzed the water-solubility of ferric sulfate,composition of dispersion system of ferric hydroxide colloid prepared by ferric chloride solution,effect of sulfate on stability of ferric hydroxide colloid.It showed that the reason for ferric sulfate was not appropriate for preparing ferric hydroxide colloid was sulfate radical was more easily absorbed by the interface than chloride ion,so the number of negative charge in the solvent layer increased,and the number of negative charges in the diffusion layer decreased,then diffusion layer became thin,finally induced coagulation of ferric hydroxide colloidal particles as a result of mutual collision.