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A hydrophobic task-specific ionic liquid designed to extract Cu2+ from water was prepared by appending thiourea-substituted alkyl groups to imidazoles and combining the resulting cationic species with PF6.The new ionic liquid was characterized and investigated for metal ion extraction capabilities,compared with conventional ionic liquids.When used in liquid/liquid extraction of Cu2+ from aqueous solutions,the metal ion extraction rate increased tremendously in TSILs.The surface analysis and Fukui Function indicates that the thiourea group possesses a powerful electronic interaction to metal ion and a strong electron donating ability,which may responsible for the improving in extraction.