2 edition of Metal separations by a polyhydroxamic acid chelating ion exchange resin. found in the catalog.
Metal separations by a polyhydroxamic acid chelating ion exchange resin.
MSc thesis, Chemistry.
Abstract. The chelating resin was synthesized by free-radical copolymerization of iminodiacetic acid modified glycidyl methacrylate with a cross-linker N,N′-methylene biscarylamide at 70°C for removal of heavy metal ions from aqueous equilibrium adsorption capacities of the chelating resin from their single-metal ion solutions were mmol/g for Cd(II), mmol/g for Cu(II. Comparison of chelating ion exchange resins in sorption of copper(II) and zinc(II) complexes with ethylenediaminetetraacetic acid (EDTA) and nitrilotriacetic acid (NTA). Canadian Journal of Chemistry , 86 (10),
Sorption properties of the iminodiacetate ion exchange resin, amberlite IRC, toward divalent metal ions. Journal of Applied Polymer Science , (2), DOI: /app Hong Yu, Geoff H. Covey, Andrea J. O'Connor. bound metal. Ion Exchange The quantity of cations exchanged is a function of pH. Exchange is very low below pH 2, increases sharply from pH 2 to 4, and reaches a maximum above pH 4. Any metal removed from solution is replaced by an equivalent amount of the ions originally on the resin. Usually an alkali metal form is best. The resin is.
The invention is for a process of removal of dissolved cation contaminants from a resin solution. The process of the invention involves providing a chelating ion exchange resin modified by treatment with an acid and contact of said solution with said modified exchange resin for a time sufficient to remove ionic metal impurities. The invention is useful for removal of ionic contaminants from. In an ion exchange wastewater deionization unit. the wastewater would pass first through a bed of strong acid resin. Replacement of the metal cations (Ni+2. Cu+2) With hydrogen ions would lower the solution pH. The anions (SO
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The resins are used for the quantitative separation of the heavy metals lead and copper, which are often present in industrial effluents. These resins show excellent kinetic characteristics for copper. A rapid ion-exchange method is proposed for the separation of several metal cations.
The method depends on the selective complexing of metal ions by a chelating agent as achieved by control of pH. To accomplish this separation, an excess of EDTA [(ethylencdiamino)tetraacetic acid] is added to the metal ion Cited by: Poly(hydroxamic acid) ion exchange resins have been used for extraction and separation of metal ions.'"7 This type of chelating ion exchanger is still not commercially available but has been synthesized by either converting the functional groups such as carboxylic acid,8 nitrile,9'10 ester," amide,12 or maleic acid13 in a polymer into the Cited by: ion exchange properties of the PHA resin are summarised in Table 2.
It is known (Ref. 4 and 13) that many metals such as Fe(III), Ti, Zr, V, Mo form very stable complexes with hydroxamic acids and are capable of being sorbed from acid solutions by PEA.
It was also observed that the metal ion-sorption capacities of the resin were pH-dependent and its selectivity toward the metal ions used is in the following order: Cu2+ > Fe3+ > Cr3+ > Ni2+ > Co2. The separation performance of the amidoxime resin for Zr ions from other cations is far superior to the sulphonic acid ion exchangers, for example at 50% extraction the acid concentrations are and M for Zr and Ce(iv) ions respectively (Figure 3).
At these acid concentrations uptake of. Poly(hydroxamic acid) resin (PHA) was prepared by modification of polyacrylamide (PAAm) prepared through γ-irradiation technique and used for the first time in separation of Zr(IV) from Y(III. A method to synthesize a poly (hydroxamic acid) chelating ion-exchange resin from poly (ethyl acrylate-divinyl benzene) and its behaviour towards some metal ions are described.
The resin was prepared from this copolymer by treatment with hydroxylamine in. Separation of metal ions on chelating resin Abstract Attempts were made to separate components of metal ion mixtures on columns of iminodiacetate type chelating resin. Distribution coefficients of metal ions in the presence of sulfosalicylic acid and citric acid were calculated in order to determine the proper pH for the most efficient separations.
The rate of uptake of metal ions was determined by shaking 1 g of the polyhydroxamic acid with 50 ml of metal ion solution ( M) and the pH adjusted to Two-ml aliquots of solution were withdrawn at the intervals of 5, 10, 20, 40 and 80 min and the residual concentrations of metal ions were determined.
Ion exchange is a popular method owing to its applicability to both preconcentration and separation. But, the use of chelating resins for separation and removal of metal ions is the method of.
Ion Exchange Resins Ion exchange resins bearing chelating functional groups have long been of interest for removing metals from water. The design of chelating ligands depends on the stability of the basic macromolecular network and its ability to add on the desired chelating functional groups.
Ion exchange has been widely applied in technology of chemical separation of noble metal ions. This is associated with dissemination of methods using various ion exchange resins which are indispensable in many fields of chemical industry.
Due to small amounts of noble elements in nature and constant impoverishment of their natural raw materials, of particular importance are. Ion exchange separation of uranyl ion (UO2+2) from metal cations has been carried out by the columnar operation using ion exchange resins in mol/dm3 sulfuric acid medium.
The chelation exchange mechanisms are found to be slower than ion exchange, and efficient separations are possible only by the choice of the correct chelating functional group. Furthermore, the chelating ligand should have a broad spectrum of chelating action and have no special selectivity for one or two metal ions.
Journal of Chromatography, () Elsevier Science Publishers B.V., Amsterdam -- Printed in The Netherlands CHROM. 21 DYESTUFF-COATED HIGH-PERFORMANCE LIQUID CHROMATO- GRAPHIC RESINS FOR THE ION-EXCHANGE AND CHELATING-EX- CHANGE SEPARATION OF METAL IONS P.
JONES*'~ and G. SCHWEDT. The selectivity of the carboxylic acid ion exchange resins in relation to the rare earth elements (III) is highly variable. Arnold and Son Hing () set the separation coefficients and investigated the mechanism of sorption of lanthanides on the carboxylic ion exchangers Amberlite IRC and Amberlite XE They showed that with the.
Metal ion solutions Metal solutions were prepared by dissolving appropriate amounts of the acetates of the metals in doubly distilled water and standardized by EDTA utrauon9 or spec- trophotometrically Synthesis of the chelating resin Poly(acrylic acid), synthesized by the method reported earlier," was heated with p-bromophenylhydroxylamine.
A cation-exchange resin exists as a polyalkylsulfonic acid, RSO 3 H and can react with a chelating agent in a protonated form HCh + (Eqn. RSO 3 H + HCh + → RSO 3 H Ch + H+ E3 Lee and coworkers [ 23 ] used the technique shown (Eqn 2) to load a number of chelating agents, among them chromotropic acid, onto the anion exchange resin Dowex.
ion-exchange mechanism. The linearity of the break-through curve indicates that the equilibrium is favor-able for the gallium-hydroxamic acid ion-exchange reaction.
Loading Kinetics. Five milliliters of the chelating ion-exchange resin and mL of Bayer solution were put in a vessel and subjected to mechanical agitation Figure 2.
The application of chelation ion exchange resins I-IX for selective extraction of certain metal ions was evaluated on the basis of the distribution ratio (D) showing the following order: D-Fe(III.
Preconcentration of Metal Ions with Anion-Exchange Resin. Journal of the Chinese Chemical Society40 (3), DOI: /jccs N. Cardellicchio, S. Cavalli, J.M. Riviello. Determination of cadmium and lead at μg/1 levels in aqueous matrices by chelation ion .Although hydroxamic acid ion exchange resin is still not commercially available today, many researches have been concentrated on this type of resin, especially on the .