No abstract

No abstract

Recovering, removing, or concentrating metal ions from wastewater containing metal ions is critical because a negative impact can be generated on living organisms by metal-contained wastewater, which contains high concentration of metals, when it is discarded into the environment without pretreatment. In this work we used deep eutectic solvents (DESs) dissolved in heptane as extractants to separate the metal ions from aqueous media with solvent extraction technique and found that DES composed of lidocaine and decanoic acid was a great extractant with extractability that reached 100% for interested metal ions. All the metal ions in the experiment were completely stripped out using 1.0 M of hydrochloric acid. DES can be employed as an extractant of metal ions for three extraction cycles with extractability exceeding 90%.

No abstract

Although ionic liquids (ILs) have excellent properties, their use as extractants in solvent extraction has not completely overcome the problems encountered when organic solvents are used. In conventional solvent extraction, a hydrophobic IL should be used to establish an IL/water biphasic system to replace the conventional organic solvent with ILs. However, the number of water-immiscible ILs is currently limited, and most contain fluorinated anions which are expensive and environmentally nonbenign. Furthermore, the use of an organic solvent as a diluent agent cannot be avoided because of the very high viscosity of ILs. An IL-based aqueous two-phase system (ATPS) can overcome these drawbacks. This chapter summarizes the use of an IL-based ATPS for the separation of metals used in various areas of human life.