新型离子交换纤维去除水中砷酸根离子的研究

制备了一种新型离子交换纤维。研究表明,该离子交换纤维对砷酸根离子具有较高的吸附容量和较快的吸附速度,吸附动力学数据完全符合Lagergren二级速度方程,在所研究的砷浓度范围内,Freundlich型吸附等温式能很好地描述吸附平衡数据,去除砷酸根离子的最佳pH值范围是3．5－7．0。离子交换纤维柱吸附实验表明了较好的动态附特性,稀NaOH溶液是砷酸根离子的有效洗脱剂,30mL 0.5mol/L NaOH溶液可定量将96．0mg/g吸附量的砷从纤维柱上洗脱。

Removal of arsenate by a new type of ion exchange fiber

A new type of ion exchange fiber was prepared for the removal of arsenate from water. A batch sorption experiments showed that the fibrous sorbent had high sorption capacity and good kinetic property for arsenate ion. The sorption kinetic data can be described by the Lagergren pseudo second order rate equation very well. Freundlich model can simulate the adsorption equilibrium data of arsenate ion in the studied concentration range. The removal of arsenate by the fiber reached a maximum in pH value range of 3 5 to 7 0. The column performance was carried to assess the applicability of the ion exchange fiber for the removal of arsenate ion with satisfactory result. The diluted NaOH solution is an efficient eluant for the desorption of arsenate on from the fiber column, and 30 mL of 0 5 mol/L NaOH can quantitatively recover arsenate from water.