离子液体中MgCl_2·6H_2O脱水及电沉积  

Dehydration and Electrodeposition of Magnesium from MgCl_2·6H_2O in Ionic Liquids

作　　者：马梅彦[1,2] 左勇[2] 张海朗 蔡迎军[2] 张锁江[2] 

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122 [2]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,北京100190

出　　处：《过程工程学报》2011年第2期209-214,共6页The Chinese Journal of Process Engineering

基　　金：国家重点基础研究发展规划(973)基金资助项目(编号:2009CB219901);中国科学院知识创新工程重要方向基金资助项目(编号:KGCX2-YW-321);国家自然科学基金青年科学基金资助项目(编号:20906096)

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(ω),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.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（ω） 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.

关 键 词：离子液体 脱水 电沉积 镁 六水合氯化镁 无水氯化镁 

分 类 号：TF822[冶金工程—有色金属冶金]