Papers by Keyword: Ion-Exchange Resin

Abstract: The purpose of the present study was to demonstrate the feasibility of adsorbent IRN77 resin for removal of Cr (III) from acid-dissolution water of chromium sludge. Extractions of Cr (III) from a model solution and a acid-dissolution water of chromium sludge were studied by IRN77 cation-exchange resin, respectively. The results suggested that extraction of Cr (III) with this resin followed the Lagergren first-order kinetics. The resin was high selective for Cr (III) sorption in the pH range 1-5 from a model solution containing 150 mg/L Cr (III), and a Cr (III) extraction above 99% was obtained. The studies further showed that 80% Cr (III) from a diluted acid-dissolution water containing about 150 mg/L Cr (III) could be removed which validated the process developed with model waste solution. At the same time, from the loaded resin 99% Cr (III) was eluted with 10% H₂SO₄. Therefore, this cation-exchange resin could be used as an efficient adsorbent material for the removal of chromium from acid-dissolution water of chromium sludge.

Abstract: In this paper, comparison of the ion-exchange characteristics of removal cadmium (Ⅱ) ions from aqueous solution was investigated. In the experiments, three strong cation-exchangers, 732 resin, K-1 fiber and ZB-1 fiber with sulfonate groups, weak cationic exchanger 724 resin with carboxylate groups and X-1 chelating fiber with diethylamino functional groups as well as the AK-22 amphoteric fiber with amino and carboxylate groups were used. In the pH value range from 2.0 to 7.0, all the candidate materials had the maximal removal Cd (Ⅱ) up to 98% except AK-22 (only 65%). The loading and eluting kinetics results showed that the exchange rate of ion-exchange fibers (especially ZB-1) were higher than ion-exchange resins. Therefore, it was found that ZB-1 ion-exchange fiber was the most effective for removal and elution of Cd (Ⅱ) and had the potential application for the purification of waters polluted by Cd (Ⅱ).

Abstract: This paper represents a simple method for preparing and characterizing of low-cost ion exchangers of sulfonated carbon prepared from Aegle Marmelos., as a source of cheap plant material blended with phenol-formaldehyde as a cross linking agent. The prepared ion exchange resins (IERS) are characterized by infrared (IR) spectral and thermal studies. All the important physico chemical properties of the ion exchangers have been determined. It is concluded from the present study that PER sample could be blended with 30% (W/W) of sulfonated Aegle Marmelos charcoal (SAMC) without affecting its physico chemical, spectral and thermal properties. Hence blending with SAMC will be finitely lower the cost of the ion exchange resin. Ion exchange process is suitable in the treatment of waste water containing metal ions discharge from plating and other industries. Also, it is a convenient way to concentrate and remove the ions of valuable metals like copper, mercury, cadmium, Nickel and Barium special processes using selective IERS are also available for the recovery of precisious noble metals like gold, platinum and silver. The present study is aimed at to synthesize and characterize new composite ion exchangers of PhOH – HCHO type, blended with SAMC and to determine the column/cation exchange capacity (or) ion exchange capacity (IEC) for some selective metal ions.

Abstract: Activated carbons with good spherical shape were prepared from polystyrene-derived ion exchange resin D001 having various divalent cations of Mg²⁺, Mn²⁺, and Fe²⁺ by CO₂ activation at 800 °C for 1.0 h. The resins having univalent cation such as Na⁺ became fragmentized after activation, which can be attributed to their poorer thermostability than that having divalent cation. The resultant spherical activated carbon SACMg has the largest specific surface area (S_BET) of 1025 m² g^-1, total pore volume (V_t) of 0.781 cm³ g^-1 and mesopore volume (V_me) of 0.510 cm³ g^-1. SACMg, SACMn, and SACFe all have high mesopore fraction of 65.3%, 61.0, and 59.8%, respectively.

Abstract: CdS nanoparticles were prepared and simultaneously loaded on the ion exchange resin microspheres via a simple in-situ gas-solid reaction. X-ray diffraction (XRD), scanning electron microscope (SEM), EDX analysis and UV-vis spectra were used to characterize the products. The results indicated that the CdS nanoparticles were loaded on the ion exchange resin microspheres, and the average size of particles was approximately 5.3 nm. The nanoparticle coverage was high so that a continuous nanoparticle shell formed on the ion exchange resin microspheres. In addition, the effect of Pb²⁺ ions (aq.) on the luminescence of the CdS nanoparticles immobilized on the ion exchange resin microspheres were investigated. It was found that the luminescence intensity of the CdS nanoparticles changed significantly when Pb²⁺ ions were adsorbed on the sample. The lowest concentration of Pb²⁺ ions that can make the intensity change is 1.0´10^-20 mol×dm^-3, which implies that the CdS nanoparticles immobilized on the ion exchange resin microspheres are very sensitive to Pb²⁺ ions (aq.).

Abstract: The Ce-Zr solid solution was prepared by co-precipitation method and ion exchange resin method. The properties of samples were characterized by XRD and SEM. Both the preparation methods can generate solid solution, and the particle size in the sample prepared by ion exchange resin is better than another when Ce-Zr solution formed. Besides, the effect of calcined temperature and feeding order on the formation of solid solution was discussed.

Abstract: Copper and its alloys are part of common used metals in the microelectronic industry. Copper uses, in microelectronic industry include interconnection and electronic packaging. The presence of copper in different alloys creates galvanic cells, which causes rising in corrosion rates. This rising leads to failure of microelectronic devices. The ability of controlling the amount of copper ions Cu (II) bath system has been carried out. The sorption of Cu (II) ions depends on pH, being maximum (73%) at pH=5 and pH=10. In solution of pH 5, the Cu (II) sorption capacity increases with the increase of copper initial concentration, leading to the conclusion that the chelating ion exchanger under study could be used in processes of Cu (II) separation and preconcentration. The Cu (II) ions equilibrium distribution between solution phase and sorbent phase has been described by means Langmuir isotherm model. The calculated value of Gibbs free energy (ΔG=-13.975 KJmol), confirms the affinity of the ion exchange resin with hydroxamic acid and amidoxime groups towards Cu (II) ions. The type of corrosion mechanism and its rate of attach depend on the exact nature of the environment (air, soil, water) in wich the corrosion takes place.

Abstract: Ion exchange resin (IER) mixed polyethersulfone (PES) hybrid membranes were prepared by a phase inversion method, using polyethyleneglycol-400 (PEG-400) and polyvinyl pyrrolidone (PVP) as additives. Two different types of resin, D201 and D061, were incorporated into polyethersulfone dope solution separately with intention of producing highly permeable and hydrophilic membranes. The effect of filler on morphology, pure water permeation, and rejection of bovine serum albumin (BSA) was investigated. It was found that the morphology of hybrid membranes showed a typical asymmetry structure. The amount of IER, the concentration of additives and the temperature of coagulation bath showed to be powerful factors to influence the pore size and pure water flux. Membranes prepared from a solution containing PES concentrations from 13wt% to 15wt%, the pure water flux decreased from 244.6 to 97.5 L/(m2•h). And PVP could serve as an additive to render the hybrid membrane hydrophilic. High values of BSA rejection capacity were performed by the resin mixed polyethersulfone hybrid membranes.

Abstract: In this paper, nanometer MgO powder was prepared by using MgCl2•6H2O as the raw material, and environmental benign strong-base anion exchange resin as the induced-precipitation regent. The influence of the concentration of MgCl2 solution, drying method, calcination temperature and time on particle size and physico-chemical features of MgO was studied. The optimal technical conditions were obtained. The XRD and SEM results show that the nanometer MgO prepared under the optimal technical conditions has regular hexagonal lamellar structure, and is composed of nanocrystals with average size between 10 to 25 nm. The existence of dry N2 prevented the sintering of MgO during decomposition processing of Mg(OH)2. Compared with the other nanometer MgO preparation methods, ion exchange resin method has the advantages of low cost, low pollution, high yield and environmental benign; therefore, it appears to be a promising method for the industrial manufacturing of nanometer MgO.