疏水性胍类离子液体萃取水溶液中的重金属离子

发布时间：2018-01-11 18:24

本文关键词：疏水性胍类离子液体萃取水溶液中的重金属离子　出处：《华东理工大学学报(自然科学版)》2016年06期 　论文类型：期刊论文

【摘要】：合成了疏水性胍类离子液体,考察室温下离子液体对水溶液中金属离子(Fe~(3+)、Cu~(2+)、Co~(2+)、Ni~(2+)、Zn~(2+))的萃取能力。实验结果表明该离子液体对Fe~(3+)萃取具有高选择性,萃取率为90%;对其他金属离子萃取率仅为40%左右。为了进一步研究离子液体对Fe3+的萃取性能,分别从两相体积比、萃取时间、金属离子起始浓度及溶液pH等因素研究了其对Fe~(3+)的捕集效果。结果表明:室温下,0.2mL离子液体与5mL的FeCl_3溶液超声混合5min后,溶液中Fe~(3+)萃取率为90%;且溶液中金属离子的起始浓度对萃取效果影响较小,但溶液pH对其影响较大。通过实验与理论计算发现,离子液体对Fe~(3+)的萃取过程存在阳离子交换与离子对的共同作用机制,但离子对作用占主导地位。
[Abstract]:Hydrophobic guanidine ionic liquids were synthesized. The effect of ionic liquids on metal ions in aqueous solution was investigated. The experimental results show that the ionic liquid has a high selectivity to the extraction of Fe~(3, and the extraction rate is 90%. The extraction rate of other metal ions is only about 40%. In order to further study the extraction performance of ionic liquids on Fe3, the volume ratio of two phases and the extraction time were studied respectively. The initial concentration of metal ions and pH of the solution were used to study the trapping effect of Fe~(3. The results showed that: at room temperature. After ultrasonic mixing of 0.2 mL ionic liquid with 5 mL FeCl_3 solution for 5 min, the extraction rate of Fe~(3 in the solution was 90%. The initial concentration of metal ions in the solution has little effect on the extraction effect, but the pH value of the solution has a great effect on the extraction effect. The mechanism of cationic exchange and ion pair interaction exists in the extraction process of ionic liquid (Fe~(3), but the ion pair is dominant.
【作者单位】：华东理工大学结构可控先进功能材料及其制备教育部重点实验室;华东理工大学国家环境保护化工过程环境风险评价与控制重点实验室;
【分类号】：O69
【正文快照】： 近些年来,利用离子液体(ILs)捕集分离废水中重金属离子的研究已受到越来越多的重视[1-15]。单独使用常规ILs作萃取剂时,萃取效果往往并不理想[1-3],萃取分离所依靠的是离子交换机制和离子对作用。由于金属离子在ILs中的溶解度非常低,必须提高ILs用量才能提高金属离子的去除效

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