Desorption of heavy metals from ion exchange resin with water and carbon dioxide

Abstract

-Adsorption and regeneration of ion exchange resins were studied using a subcritical solution of a CO 2 -H 2 O mixture and a fixed bed column. The commercial Amberlite IRC-50/IRC-86 cation exchange resins and Amberlite IRA-67 anion exchange resin were tested for heavy metals (Pb, Cu, Cd) adsorption from a solution with different initial metal concentrations at different temperatures. After adsorption, the loaded resins were regenerated with water and carbon dioxide at different temperatures and a pressure of 25 MPa. The efficiency of the IRC-50 resin was lower than that of the IRC-86 resin for the adsorption of metals like Cd, Cu and Pb. Results obtained for desorption of these metals indicated that the process could be used for Cd and in principle for Cu. Sorption of metal ions depended strongly on feed concentration. Mathematical modeling of the metal desorption process was carried out successfully as an extraction process. For this purpose, the VTII Model, which is applied to extraction from solids using supercritical solvents, was used in this work.

Study on the synthesis of a macroporous ethylacrylate‐divinylbenzene copolymer, its conversion into a bi‐functional cation exchange resin and applications for extraction of toxic heavy metals from wastewater

“…Ion exchange techniques are the most common and effective for the removal of the metals from wastewater due to their high treatment capacity, high removal efficiency, and fast kinetics 3. Different types of ion exchange resins have been investigated by various researchers for the removal of heavy metals from aqueous solutions 4–7. Ion exchange resins are insoluble in water and re‐usable which makes them environmentally compatible and economical.…”

Application of Time-Lapse Ion Exchange Resin Sachets (TIERS) for Detecting Illegal Effluent Discharge in Mixed Industrial and Agricultural Areas, Taiwan

“…The resins tend to exchange ions with ions with high electric charge, ions with smaller hydration volume, ions with greater polarity, ions with active exchanger, and ions that do not easily form compounds with other ions. As the exchange efficiency of the resins is usually affected by pH, temperature, initial metal concentration, and attaching time [56,57], many studies have conducted the ion exchange equilibrium tests of heavy metal with varying metal ion concentration, pH, agitation time, resin weight, and reaction temperature [58,59]. They analyzed the ion-exchange equilibria by the various isotherm models (i.e., Langmuir, Freundlich, Redlich-Peterson, selectivity coefficient approaches), and regressed the ion-exchange kinetic data by different kinetic models (i.e., pseudo first-order, second-order, reversible reaction model).…”

Adsorption Studies of Pb2+ From Aqueous Solutions Using Unmodified and Citric Acid – Modified Plantain (Musa paradisiaca) Peels

“…3. Sorption of metal ions is strongly dependent on the concentration of the feed [20] and since the same initial concentration of the feed was used, the availability of adsorption sites on the adsorbent may have led to the different rates observed for Un-GPP and CA-GPPmaximum adsorption was noticed at 30 minutes for Un-GPP but was different for CA-GPP -120 min. The modifying agent contributed COO -linkages and also increased the H + concentration, likely providing more adsorption sites.…”