Recovery of Indium(III) from a Hydrochloric Acid Medium with Two Types of Solvent Impregnated Resins Containing Sec-octylphenoxy Acetic Acid

Abstract

A solvent impregnated resin (SIR) with sec-octylphenoxy acetic acid (CA-12) impregnated on a styrene-divinylbenzene copolymer support (HZ818) was first prepared. To improve the stability of the first SIRs for indium adsorption, a novel type of SIR (NSIR) had been prepared by forming a PVA-boric acid protective layer on the first SIR containing CA-12. The NSIR and SIR were characterized, and their adsorption behavior for indium(III) were compared by batch and column methods in a hydrochloric acid medium. Both the NSIR and SIR showed high adsorption capacities for In(III) at pH 3.0, and the maximum adsorption capacities increased with temperature. The Langmuir isotherm and pseudo second-order model fit the experiment data well at different temperatures. The NSIR showed better stability and reusability than the SIR. It is possible to separate In(III) from a mixed solution containing Zn(II), Cu(II), Cd(II) and In(III) at pH 3.0 from hydrochloric acid medium with SIR and NSIR.

Mechanisms of L‐lysine extraction with sec‐octylphenoxy acetic acid in sulfonated kerosene

“…Accordingly, in this study, the electrostatic interaction between CA‐12 and L‐Lys is controlled by acidity, so is the extraction efficiency. The pK a of CA‐12 carboxyl and the pH at the carboxyl's total dissociation are calculated to be 3.52 and 8.53, respectively . Theoretically, when pH is less than 8.53, the concentration of CA‐12 anion is positively correlated with pH, resulting in an increased extraction efficiency of L‐Lys until reaching the maximum at pH = 8.53.…”

“…The pK a of CA-12 carboxyl and the pH at the carboxyl's total dissociation are calculated to be 3.52 and 8.53, respectively. 58 Theoretically, when pH is less than 8.53, the concentration of CA-12 anion is positively correlated with pH, resulting in an increased extraction efficiency of L-Lys until reaching the maximum at pH = 8.53. The pK a values of -amino and -amino groups of L-Lys are calculated to be 8.95 and 10.53, respectively, hence the two amino groups are positively charged when pH is less than 7.0.…”

Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

“…Liu et al [112] selectively separated In(III), Ga(III), and Zn(III) from sulfate solution using D2EHPA-impregnated resins. They also investigated the separation of In(III) from HCl solutions containing Zn(II), Cu(II), Cd(II), and In(II) by sec-octylphenoxy acetic acid (CA-12)-impregnated HZ818 (a styrene-divinylbenzene copolymer support) and the coated one, respectively [113]. Both the SIRs and the coated resins present the highest adsorption capacities for In(III).…”

“…Furthermore, nearly all metal sorption processes on SIRs can be described by the Langmuir and/or Freundlich models. The Langmuir equation is applicable to homogeneous sorption where the sorption of each molecule has equal sorption activation energy or the sorption in the active sites is independent of whether the adjacent sites are occupied or not [113,148].…”

Formaldehyde Removal by Using Solid Phase Extraction with an Imination Reaction on an Amine Type Trident Molecule-Impregnated Resin

“…The alkyl branch of the more lipophilic tris(aminomethyl)nonene does not significantly affect the pK a values. To use such compounds as an impregnated resin [9][10][11][12] is another approach in keeping functionality in formaldehyde removal.…”