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›› 2011, Vol. 11 ›› Issue (2): 209-214.

• 反应与分离 • 上一篇    下一篇

离子液体中MgCl2×6H2O脱水及电沉积

马梅彦 左勇 张海朗 蔡迎军 张锁江   

  1. 江南大学化学与材料工程学院 中国科学院过程工程研究所多相复杂系统国家重点实验室 江南大学化学与材料工程学院 中国科学院过程工程研究所多相复杂系统国家重点实验室 中国科学院过程工程研究所
  • 收稿日期:2011-01-21 修回日期:2011-02-24 出版日期:2011-04-20 发布日期:2011-04-20
  • 通讯作者: 马梅彦

Dehydration and Electrodeposition of Magnesium from MgCl2×6H2O in Ionic Liquids

MA Mei-yan ZUO Yong ZHANG Hai-lang CAI Ying-jun ZHANG Suo-jiang   

  1. School of Chemical and Material Engineering, Jiangnan University State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, CAS School of Chemical and Material Engineering, Jiang nan University State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, CAS Institute of Process Engineering, CAS
  • Received:2011-01-21 Revised:2011-02-24 Online:2011-04-20 Published:2011-04-20
  • Contact: MA Mei-yan

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摘要： 研究了MgCl2×6H2O在离子液体中的溶解及脱水性能，结果表明，以Cl-为阴离子的离子液体对MgCl2×6H2O(包括无水MgCl2)的溶解性良好(溶解度20%~70%)，溶于离子液体的MgCl2×6H2O经鼓风干燥或真空脱水后水分含量低于1′10-4(w)，满足熔盐电解镁的要求. 在此基础上，还研究了MgCl2-离子液体电解体系中阴极镁电沉积规律，通过循环伏安测试结合SEM-EDS分析手段考察了不同离子液体体系(包括二烷基咪唑离子液体、三烷基咪唑离子液体及季铵盐离子液体)的阴极极限、镁的沉积电位及可逆性，结果表明，金属镁可从MgCl2-离子液体电解体系沉积出来，但离子液体的阴极极限与镁离子的沉积电位较接近，且电沉积可逆性较差.

关键词: 离子液体, 脱水, 电沉积, 六水合氯化镁, 无水氯化镁

Abstract: The solubility and dehydration of MgCl2×6H2O in various ionic liquids (ILs) were investigated. The results showed that MgCl2×6H2O and MgCl2 were well soluble (solubility 20%~70%) in hydrophilic ionic liquids, especially those with chloride anion. The moisture content after dehydration was lower than 1′10-4(w) which satisfies the request of electrodeposition. The electrodeposition of magnesium from various MgCl2-ILs systems was further studied. The cathodic limit of ionic liquids (including alkylimidazolium, trialkylimidazolium and quaternary ammonium ILs), the reduction potential of magnesium and deposition process were observed using cyclic voltammetry, SEM and EDS measurements. It is shown that magnesium can be deposited from MgCl2-ILs systems, but the reduction potential of magnesium is not more negative than that for the reduction of ionic liquids cation and reversibility of magnesium is not very well.

Key words: ionic liquid, dehydration, electrodeposition, magnesium chloride hexahydrat, magnesium chloride