Removal of Cr(vi) by Stabilized Solvent Impregnated Resin (Sir) Prepared by Using a Hydrophilic Polymer Adsorbent and Aliquat 336.

Abstract

The solvent impregnated resin (SIR) was prepared by using Diaion HP-2MG as a hydrophilic polymer adsorbent and commercial Aliquat 336 as extractant for hexavalent chromium Cr(VI) removal from aqueous solution. The resulting SIRs were stabilized by coating using poly(vinyl alcohol) (PVA) and divinylsulfone as crosslinking reagent with different amounts. In order to predict the mechanism involved in the adsorption process, several kinetic models were used. Among them, the sorption kinetics was usually described by pseudo-first or pseudo-second order models. The kinetic behavior of stabilized SIRs was investigated as a function of amount of crosslinking reagent by batch adsorption equilibrium. Uncoated resins exhibited a faster kinetics than coated ones. It was possible to improve the kinetic performance of crosslinked resins with conditioning by using NaOH-NaCl mixture. The breakthrough profiles of SIRs were also influenced by amount of crosslinking reagent.

Functionalization of magnetic chitosan microparticles for high-performance removal of chromate from aqueous solutions and tannery effluent

“…The presence of organic compounds in acidic solutions enhances the reduction of Cr(VI) to Cr(III), which makes easy metal precipitation. Solvent-based extraction was also used directly for the recovery and the separation of chromate anions [7], but also through the impregnation of porous resins (solvent-impregnated resins [8]), or using supported hollow fiber systems [9]. Many studies have demonstrated the potential of zero-valent iron [10], iron oxide [11], and magnetitebased sorbents [12] for the removal of chromate anions.…”

Synthesis and Characterization of Functionalized Chitosan Nanoparticles with Pyrimidine Derivative for Enhancing Ion Sorption and Application for Removal of Contaminants

“…The acidic medium enhances the reduction of Cr(VI) to Cr(III) for easily precipitation. Solvent extraction [23,24] and the impregnated process (solvent-impregnated resins) are also used for the recovering and of chromate anions [25][26][27]. Other studies are based on using zerovalent iron, iron oxide, and magnetite sorbents [28,29] for the removal of chromate anions.…”