Na₂WO₄溶液离子交换中WO₄^2-和SO₄^2-的吸附性能

来源期刊：中南大学学报(自然科学版)2002年第3期

论文作者：孙培梅 谢武明 李洪桂 李运姣 赵中伟 霍广生 孙召明

文章页码：238 - 241

关键词：Na₂WO₄溶液;离子交换;流出曲线;吸附性能

Key words：Na₂WO₄solution; ion-exchange; effuse curves; adsorption performance

摘    要：测定了用201×7强碱性阴离子交换树脂和含SO₄^2-的Na₂WO₄溶液进行离子交换时WO₄^2-和SO₄^2-的流出曲线,研究了两者在共同吸附时的吸附性能.结果表明:SO₄^2-的流出曲线始终在WO₄^2-流出曲线的前边,并且SO₄^2-的流出曲线中有一段待测离子浓度与交前液中相应离子浓度之比(c/c₀)大于1的峰值,说明在离子交换过程中,树脂对WO₄^2-的吸附能力大于对SO₄^2-的吸附能力,溶液中的WO₄^2-和吸附在树脂上的SO₄^2-之间发生了交互作用.通过单柱、2柱及3柱交换时SO₄^2-和WO₄^2-流出曲线的对比研究发现,利用串柱交换可增大WO₄^2-的交换容量,提高WO₄^2-和SO₄^2-的分离效果.

Abstract: The effuse curves of WO₄^2- and SO₄^2- were determined in the ion-exchange process of 201×7 resin with Na₂WO₄ solution contaning SO₄^2-. The adsorption performances of WO₄^2- and SO₄^2-were studied when they were adsorbed together by resin. The results show that the effuse curve of SO₄^2- are in frontof thatof WO₄^2- and has an apex(c/c₀>1). The absorption ability of 201×7 resin with WO₄^2- is larger than that of SO₄^2-, and the reactions occur between WO₄^2- in solution and SO₄^2- in resin. The apex of SO₄^2- effuse curve may be increased and the exchange capacity of WO₄^2-may be improved by series-column.