ChemInform Abstract: Ion‐Exchange Equilibria of Cu²⁺, Cd²⁺, Zn²⁺, and Na⁺ Ions on the Cationic Exchanger Amberlite IR‐120.

Abstract

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Adsorption of Au(III), Pd(II), and Pt(IV) from Aqueous Solution onto Graphene Oxide

“…Hence, more and more attention has been focused on the recovery of precious metals from aqueous solutions. At present, there are several available methods for the recovery of metal ions from aqueous solutions, such as electrolysis, solvent extraction, − filtration, ion exchange, − liquid–liquid extraction, − precipitation, − and adsorption. − Each method has its own advantages and disadvantages. However, the recovery methods sometimes suffer from many problems such as highly toxic sludge, excessive time-consumption, and high costs.…”

Ion Exchange Equilibrium Prediction for the System Cu2+−Zn2+−Na+

“…Valverde et al also obtained experimental data for the binary systems Cu 2+ −Na + and Zn 2+ −Na + using Amberlite IR 120. To represent this equilibrium, a nonideal Mass Action Law was used.…”

“…The novelty associated to this work is the acquisition of equilibrium data of ionic exchange of all the constitutive pairs (Cu 2+ −Na + , Zn 2+ −Na + , Zn 2+ −Cu 2+ ) of the ternary system Cu 2+ −Zn 2+ −Na + . Valverde et al obtained experimental data for the binary systems Cu 2+ −Na + and Zn 2+ −Na + using the Amberlite IR 120 resin but did not obtain equilibrium data for the binary system Zn 2+ −Cu 2+ and the ternary system. The prediction of ionic exchange equilibrium of the ternary system Cu 2+ −Zn 2+ −Na + , through the nonideal Mass Action Law, requires equilibrium data of all constitutive pairs of the ternary system to be known, and therefore the data obtained by Valverde et al are not enough.…”

“…Valverde et al obtained experimental data for the binary systems Cu 2+ −Na + and Zn 2+ −Na + using the Amberlite IR 120 resin but did not obtain equilibrium data for the binary system Zn 2+ −Cu 2+ and the ternary system. The prediction of ionic exchange equilibrium of the ternary system Cu 2+ −Zn 2+ −Na + , through the nonideal Mass Action Law, requires equilibrium data of all constitutive pairs of the ternary system to be known, and therefore the data obtained by Valverde et al are not enough. In addition, Valverde et al studied the ionic exchange in the following concentration range: (50 to 100) mEq·L −1 .…”

“…The prediction of ionic exchange equilibrium of the ternary system Cu 2+ −Zn 2+ −Na + , through the nonideal Mass Action Law, requires equilibrium data of all constitutive pairs of the ternary system to be known, and therefore the data obtained by Valverde et al are not enough. In addition, Valverde et al studied the ionic exchange in the following concentration range: (50 to 100) mEq·L −1 . This range is too high since the ionic exchange process for treatment of wastewater is usually applied for diluted systems.…”