BACKGROUND: Ion exchange resins based on poly[(4-vinylbenzyl) trimethylammonium chloride] P(ClVBTA) and poly[(3-acrylamidopropyl) trimethyl ammonium chloride] P(ClAPTA) were synthesized by radical polymerization. Metal ion uptake experiments were run with these synthesized resins and compared with the commercially available anion exchange resin Amberlite IRA-400. RESULTS: Retention of Cr(VI) was found to be independent of pH and the co-existence of Cl − and SO 42− ions for two resins. The sorption data obtained were evaluated using well-known kinetic and adsorption isotherm models. The kinetic data obtained for the two resins fitted well to the pseudo-second-order model and the Langmuir isotherm. Besides, it was observed that temperature influenced slightly the sorption properties of the ion exchange resins synthesized in this study and commercially available ion exchange resin Amberlite IRA-400. CONCLUSIONS:The synthetic resins showed a better sorption performance than a commercially available ion exchange resin. The P(ClVBTA) and P(ClAPTA) resins exhibited greater and faster sorption than Amberlite IRA-400. Sorption capacities of these ion exchangers were found to be in the order P(ClAPTA) > P(ClVBTA) > Amberlite IRA-400.

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The synthesis and sorption performance of As(V) with a copolymer resin is presented. The resin was obtained via the radical polymerization of a 1:1 mixture of N‐(4‐vinyl benzyl)‐N‐methyl‐D‐glucamine and (4‐vinyl benzyl)trimethyl ammonium chloride using N,N‐methylene‐bis‐acrylamide as the crosslinker. The effect of pH, concentration, and time on the arsenic sorption was studied. The copolymer exhibited good performance over a wide pH range regardless of the initial concentrations. The equilibrium experiments presented better results under alkaline conditions (pH 9.0) compared with acidic conditions (pH 3.0). The kinetic sorption was quite fast, particularly at low arsenic concentrations. In addition, the arsenic anions were eluted with different acid/alkaline reagents, and the acid eluents exhibited the best results. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 1187–1193, 2014

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.