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基于唐南渗析原理,采用阳离子交换膜去除原水中Cu2+、Mn2+、Zn2+等重金属离子,研究影响阳离子交换膜去除各重金属离子能力大小的机制以及2种重金属离子共存时互相干扰的机制.结果表明,阳离子交换膜可有效去除原水中Cu2+、Mn2+、Zn2+等重金属离子,去除率为75%～85%;在浓度相同下且重金属离子带相同电荷数时,其水化离子半径越小,离子扩散速度就越快,阳离子交换膜对其去除能力就越强;当重金属水化离子半径基本相同时,膜对原子序数小的重金属离子的去除能力更强;相同浓度且相同电荷数的重金属离子共存时,各离子同步被去除,但各离子之间存在干扰,越易于被离子交换的离子与其它离子共存时,其竞争能力越强,使其他离子的去除率降低越多;当待去除离子的总浓度远低于膜的交换容量时,离子共存时各离子的去除率相比离子单独存在时各离子的去除率下降幅度不大.
Based on the principle of dialysis in the south of Tangnan, the mechanism of removal of heavy metal ions such as Cu2 +, Mn2 +, Zn2 + from raw water by cation exchange membrane and the interaction between two kinds of heavy metal ions in the coexistence of two heavy metal ions were studied.The results showed that, The cation exchange membrane can effectively remove heavy metal ions such as Cu2 +, Mn2 +, Zn2 + and the like in the raw water with a removal rate of 75% -85%. At the same concentration of heavy metal ions with the same charge number, the smaller the ionization radius, The faster the cation exchange membrane can remove it. When the hydration ionic radius of heavy metal is basically the same, the removal of heavy metal ions with smaller atomic number is stronger. When the same concentration of heavy metal ions with the same charge coexist , The ions are removed synchronously, but there is interference between the ions. The more ion-exchangeable ions coexist with other ions, the stronger their competitive ability is, and the more the removal rate of other ions is reduced. When the total ion to be removed When the concentration is much lower than the exchange capacity of the membrane, the removal rate of each ion when the ions coexist is lower than that when ions are present alone Degree is not.