应用循环伏安法研究了Eu3+在亲水性离子液体—氯化1-丁基-3-甲基咪唑([BMIM]Cl)中的电极过程.实验表明,工作电极为玻碳电极时,[BMIM]Cl的电化学窗口为-1.7～0.80V(vs.Ag/AgCl).Eu3+在[BMIM]Cl中被还原为Eu2+,此电极反应受电荷迁移和物质扩散共同控制.当体系温度从55℃升高到75℃时,Eu3+在[BMIM]Cl中的扩散系数D从3.75×10-9cm2/s变化到1.32×10-8cm2/s,该反应活化能Ea为62.6kJ/mol.
The electrochemical behavior of EuCl3 in 1-butyl-3-methylimidazolium chlorid([BMIM]Cl) has been investigated in the temperature range of 328 ～ 348 K by cyclic voltammetry.Influences of scan speed and temperature in [BMIM]Cl have been examined.The electrochemical window of [BMIM]Cl was-1.7 V ～ 0.80 V(vs.Ag/AgCl),when the working electrode was glassy carbon electrode.Eu3+ in[BMIM]Cl underwent a single step one-electron transfer reduction to Eu2 +,which is quasi-reversible reaction controlled by both electron transfer and diffusion of ions.The diffusion coefficient of Eu3 + in [BMIM]Cl increased with increase of temperature from 3.75 × 10-9 cm2 /s at 328 K to 1.32 × 10-8 cm2 /s at 348 K and the activation energy was found to be 62.6 kJ/mol.
[1]Rao C J,Venkatesan K A,Nagarajan K,et al.Dissolu-tion of uranium oxides and electrochemical behavior of U(VI)in task specific ionic liquid[J].Radiochim Acta,2008,96:403-409.
[2]Noriko A,Masayuki H,Yoshiyuki Y,et al.Application of ionic liquids to pyrochemical reprocessing methods-electrochemical properties of uranyl ion in ionic liquids[J].Proceedings of Global,2005,Oct9-13,458.
[3]Anderson C J,Choppin G R,Pruett D J,el al.Electro-chemistry and spectroscopy of UO22+in acidic AlCl3-EMIC[J].Radiochim Acta,1999,84:31-36.
[4]Giridhar P,Venkatesan K A,Srinivasan T G,et al.Elec-trochemical behavior of uranium(VI)in1-butyl-3-meth-ylimidazolium chloride and thermal characterization of u-ranium oxide deposit[J].Electrochimica Acta,2007,52,3006-3012.
[5]Nikitenko S I,Cannes C,Naour C L,et al.Spectroscopic and electrochemical studies of U(IV)-hexachloro com-plexes in hydrophobic room-temperature ionic liquids[BuMelm][Tf2N]and[MeBu3N][Tf2N][J].InorgChem,2005,44,9497-9505.
[6]Bhatt A I,Duffy N W,Collison D,el al.Cyclic voltam-metry of Th(IV)in the room-temperature ionic liquid[Me3NnBu][N(SO2CF3)2][J].Inorg Chem,2006,45,1677-1682.
[7]Bhatt A I,May I,Volkovich V A,et al.Structural char-acterization of a lanthanum bistriflimide complex,La(N(SO2CF3)2)3(H2O)3,and an investigation of La,Sm,and Eu electrochemistry in a room-temperature ionic liq-uid,[Me3NnBu][N(SO2CH3)2][J].Inorg Chem,2005,44:4934-4940.
[8]Chen P Y,Hussey C L.Electrochemistry of ionophore-coordinated Cs and Sr ions in the tri-1-butylmethylam-monium bis((trifluormethyl)sulfonyl)imide ionic liquid[J].Electrochimica Acta,2005,50:2533-2540.
[9]Jayakumar M,Venkatesan K A,Srinivasan T G.Electro-chemical behavior of fission palladium in1-butyl-3-methylimidazolium chloride[J].Electrochimica Acta,2007,52:7121-7127.
[10]Rao C J,Venkatesan K A,Nagarajan K,et al.Treat-ment of tissue paper containing radioactive waste and electrochemical recovery of valuables using ionic liq-uids[J].Electrochimica Acta,2007,53:1911-1919.
[11]Giridhar P,Venkatesan K A,Reddy B P,et al.Recov-ery of fission palladium by electrodeposition using tem-perature ionic liquids[J].Radiochim Acta,2006,91:131-136.
[12]Ryuji N,Makoto A,Takaumi K,et al.Spectroscopic and electrochemical properties of europium(III)ion in hydrophobic ionic liquids under controlled condition of water content[J].Journal of Alloys and Compounds,2007,431:221-225.
[13]Rao C J,Venkatesan K A,Nagarajan K,et al.Electro-chemical behavior of europium(III)in N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfony)imide[J].Electrochimica Acta,2009,54:4718-4725.
[14]Deng Y Q.Ionic liquid-property,preparation and appli-cation[M].Beijing:China Petrochemical Press,2006.11-12.
[15]Bard A J,Faulkner L R.Electrochemical methods fun-damentals and application[M].Beijing:Chemical In-dustry Press,2005.166-167.
[16]Hu H l,Li N.Electrochemical measure[M].Beijng:National Defence Industry Press,2007.169-171.
