Iminodiacetic Acid Chelating Resin Research Articles

Simultaneous adsorption of V(V) in both anionic and cationic forms from acid leaching solution using iminodiacetic acid chelating resin

An efficient separation and extraction method for the recovery of V(V) in both anionic and cationic species from pressure acid leaching solution of vanadium shale was developed using the iminodiacetic acid chelating resin CH-90. The optimum process parameters were explored. The mechanism of V(V) adsorption and selective separation between V(V) and impurities were revealed by FTIR, XPS, SEM-EDS, and DFT theory. Experiments showed that under the conditions of pH= 1.6, adsorption temperature of 40 ℃, bed volume of 20 mL, and feed liquid flow rate of 2 BV/h, the resin had the best effect on V(V) with an adsorption rate of 91.3% and impurity ions adsorption rate less than 20%; The desorption rate of V(V) can reach 100% when 2 mol/L HCl as the desorption agent; 4 mol/L HCl could restore the performance of resin. The reaction between the resin and V(V) included the electrostatic interaction between H2V10O284- and -N, and the coordination reaction in which VO2+ chelated with N and O atoms. DFT calculation results showed that resin preferentially adsorbed H2V10O284- during the adsorption process. CH-90 resin contributed to simultaneously separating V(V) in the form of H2V10O284- and VO2+ from a complex sulfuric acid leaching system at low pH.

Removal of Alkali and Alkaline Earth Elements from Cobalt Solutions Using Iminodiacetic Acid Chelating Resin

Removal of Alkali and Alkaline Earth Elements from Cobalt Solutions Using Iminodiacetic Acid Chelating Resin

Selective adsorption of lead(II) from aqueous solution

ABSTRACT Adsorptive separation of Pb(II) from aqueous solution containing Pb(II) and other heavy metals (Cu(II), Zn(II) and Cd(II)) has been investigated, using three adsorbents, such as an iminodiacetic acid-chelating resin (CR11) and Fe-based adsorbents (goethite and magnetite). Batchwise adsorption of Pb(II) and other metal ions in single metal system and multi-components system was carried out with varying parameters, such as pH, time and initial concentrations of metals. CR11 possesses the highest adsorption ability for these metals, while the selectivity of individual metal is little. Goethite possesses selectivity for Pb(II) and Cu(II), and magnetite possesses selectivity for Pb(II), though the adsorption capacity for the metals is less than those with CR11. The kinetics of the adsorption of metals with all adsorbents is of pseudo-second-order, and the magnetite is revealed to have the fastest adsorption kinetics. The three adsorbents can be applied for chromatographic separation for these metals. The magnetite is feasible for selective separation of Pb(II), although complete elution cannot be achieved.

Extraction of uranium from non-saline and hypersaline conditions using iminodiacetic acid chelating resin Purolite S930+

Uptake behaviour of uranium from aqueous, acidic sulfate and chloride media on iminodiacetic acid chelating resin Purolite S930+ has been studied. Experiments have followed UO22+, Cu2+ and Fe3+ uptake behaviour with respect to acidic and ionic media type and concentration. Uptake suppression of all metals was observed at [H+] > 0.1 M sourced from H2SO4 and HCl. In contrast, significant uptake of Fe3+ was observed from solutions with [HCl] > 2 M. Suppression of UO22+ uptake (up to 15%) was observed upon increasing [SO42−] to 4 M, whilst negligible UO22+ uptake suppression was observed with [Cl−] up to 6 M. The impact of Fe3+ concentration on UO22+ extraction under hypersaline conditions ([Cl−] = 22.6 g L−1, 0.64 M) has been studied and behaviour fit to Langmuir and Dubinin-Radushkevich isotherms. Extended X-ray absorption fine structure (EXAFS) studies have been performed to assess the effect of salinity on the uranium coordination environment on the resin and therefore the mechanism of uptake. No change in surface species was observed, with the fit species being uranyl bound by the iminodiacetic acid functional group in a tridentate motif, with an associated bidentate sulfate group. An isotherm model based on this surface species has also been derived. It has been shown that at pH 2 there is little impact of increasing chloride and sulfate concentrations on the extraction behaviour of metals onto Purolite S930+ under the conditions tested. Rather, uranium uptake is more affected by the presence of Fe3+ in solution. As [Fe3+]/[UO22+] is increased from 0 to 2, UO22+ uptake is reduced by up to 66% at aqueous equilibrium.

Immobilization of 5-aminopyridine-2-tetrazole on cross-linked polystyrene for the preparation of a new adsorbent to remove heavy metal ions from aqueous solution

Novel 5-aminopyridine-2-tetrazole-functionalized polystyrene resin (APTZ-PS) was prepared by anchoring 5-aminopyridine-2-carbonitrile onto chloromethylated polystyrene beads (CMPS) and subsequently using the cyano-tetrazole conversion reaction. The APTZ-PS resin was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and specific surface area and pore size analyses. The adsorption experiments of the prepared resin for heavy metal ions were conducted by batch methods. The effects of the experimental conditions, such as pH, contact time and initial metal ion concentration on the adsorption properties of Cu(II), Pb(II) and Hg(II) were investigated. The results showed that the resin possessed perfect adsorption capacities for Cu(II), Pb(II) and Hg(II), and the selectivity was different from the commonly used iminodiacetic acid-chelating resin. The sorption kinetics of the three metal ions followed the pseudo-second-order equation. The adsorption isotherms for Cu(II) and Pb(II) could be better fitted by the Langmuir model than the Freundlich model, whereas the Freundlich model was the best for the Hg(II) ion. Even after five consecutive adsorption–desorption cycles, no obvious change in the adsorption capacity of the resin was found, which implied that the APTZ-PS resin was suitable for the efficient removal of heavy metal ions from aqueous solution.

Multielemental Elution Behavior of Metal Ions Adsorbed on Iminodiacetic Acid Chelating Resin by Using Hydrogen Peroxide as an Eluent

In the present work, we investigated the multielemental elution behavior of metal ions absorbed on iminodiacetic acid (IDA) chelating resin by using hydrogen peroxide (H(2)O(2)) as an eluent. As a result, V(V), Mo(VI), W(VI), Nb(V) and Ta(V) were efficiently eluted by H(2)O(2). In contrast, other metal ions were rarely recovered. The oxidation states of V(V), Mo(VI), and W(VI) were not changed through the H(2)O(2) eluting process, checked by X-ray photoelectron analysis. In addition, the UV-vis adsorption spectra and IR spectra of V(V), Mo(VI) and W(VI) in the H(2)O(2) eluent suggested the formation of metal-peroxo complexes through H(2)O(2) elution. The desorption of these metal ions from IDA functional groups is explained in term of destabilization along with the coordination of peroxo-ligands to the V(V)-, Mo(VI)- and W(VI)-IDA complexes, and a decrease in the adsorption capacity by electrostatic repulsion between dissociated carboxylic groups of IDA and the oxoanions in the neutral pH shown in 30 wt% H(2)O(2). When this method was applied to the selective separation of V(V), Mo(VI) and W(VI) from other metals in an acid soluble fraction of fly-ash, 83.4 ± 2.5% of V(V), 88.1 ± 3.3% of Mo(VI), and 69.3 ± 5.4% of W(VI) were recovered in a 30 wt% H(2)O(2) eluent.

Adsorption and concentration of histidine-containing dipeptides using divalent transition metals immobilized on a chelating resin

The adsorption of histidine-containing dipeptides such as carnosine (Car) onto a copper(II) immobilized chelating resin has recently been reported. Cu(II) immobilized iminodiacetic acid chelating resin selectively adsorbs Car via a metal affinity interaction from saline water. In this study, the adsorption behavior of Car on chelating resins after the immobilization of a series of divalent transition metal ions (Cu(II), Ni(II), Co(II) and Zn(II)) was investigated. Only Cu(II) immobilized chelating resin (Cu-IDA) adsorbed Car from the saline solution. The elution of Cu(II) from Cu-IDA was minimized by optimizing the amount of Cu(II) immobilized on the resin. In a column operation for the recovery of Car using Cu-IDA we found that Car was efficiently concentrated to 20 times the concentration of the feed solution.

Ion-exchange equilibria of Ni 2+, Co 2+, Mn 2+ and Mg 2+ with iminodiacetic acid chelating resin Amberlite IRC 748

A chelating ion-exchange resin, Amberlite IRC 748 which carries an iminodiacetate acid functional group has been investigated for its adsorption properties towards Ni, Co, Mn and Mg from aqueous solution. Experiments were conducted through batch adsorption by varying the resin volume at three different pH values. It was observed that the amount of metals adsorbed by the resin increased with increasing pH. The applicability of both the Langmuir and Freundlich isotherms were analyzed on the equilibrium data obtained. In all cases, the Langmuir isotherm shows an excellent fit to the experimental data while the Freundlich isotherm failed to predict the data at higher loadings. The resin exhibited high selectivity towards nickel ( K = 58,000) and cobalt ( K = 16,800), which can be easily separated from magnesium and manganese at pH 4 and 5. The obtained values of the equilibrium constant K (l/mol) matched the expected order of selectivity of this resin which is Ni > Co > Mn > Mg. The results also showed that the adsorption mechanisms of these metals onto the resin follow a combination of monolayer and multilayer adsorption.

Adsorption of histidine-containing dipeptides on copper(II) immobilized chelating resin from saline solution

Adsorption of histidine-containing dipeptides such as carnosine (Car) was investigated using copper(II) immobilized cation exchange resins. Adsorption of Car was enhanced using Cu(II) immobilized resins, on the basis of metal affinity interactions. In particular, iminodiacetic acid chelating resin with immobilized Cu(II) (Cu–IDA) can adsorb Car from saline water. Car was adsorbed on Cu–IDA even in the presence of 1000 mM of NaCl. Adsorption of various amino acids on Cu–IDA was compared under same conditions. Histidine and the histidine-containing dipeptides were selectively adsorbed on Cu–IDA over other amino acids, both in the absence and in the presence of NaCl. Therefore, immobilized metal affinity adsorption is an efficient method for recovering histidine-containing dipeptides from saline water.

Selective separation of indium by iminodiacetic acid chelating resin

Indium can be recovered by treating residues, flue dusts, slags, and metallic intermediates in zinc smelting. This paper investigates the adsorption characteristics of indium and iron on an iminodiacetic acid chelating resin, Amberlite®IRC748 (Rohm and Haas Co.-USA). High concentrations of iron are always present in the aqueous feed solution of indium recovery. In addition, the chemical behaviour of iron in adsorptive systems is similar to that of indium. The metal concentrations in the aqueous solution were based on typical indium sulfate leach liquor obtained from zinc hydrometallurgical processing in a Brazilian plant. The ionic adsorption experiments were carried out by the continuous column method. Amberlite®IRC748 resin had a high affinity for indium under acidic conditions. Indium ions adsorbed onto the polymeric resin were eluted with a 0.5mol/dm3 sulphuric acid solution passed through the resin bed in the column. 99.5% pure indium sulfate aqueous solution was obtained using the iminodiacetic acid chelating resin Amberlite®IRC748.

Recovery of nickel from Orimulsion fly ash by iminodiacetic acid chelating resin

Macroporous resins containing imminodiacetic acid (IDA) groups (Lewatit TP-207, Purolite S-930 and Amberlite IRC-748) were studied under dynamic conditions for uptake of nickel ions from the sulphate solution at pH 4 deriving from preliminary acid leaching of Orimulsion fly ash and subsequent vanadium recovery and impurities removal stages. The effects of temperature and ionic medium on the Ni adsorption were investigated. The Lewatit TP-207 showed higher Ni uptake capacity in all operating conditions examined with an adsorption capacity of 1.32 mmol of Ni/g at 40 °C using the real process solution at pH 4. The extraction of Ni adsorbed on the resin was obtained using 10 wt.% H 2SO 4; the resultant concentrated solution of nickel sulphate, containing about 13 g/L of nickel, can be suitable for elettrowinning, precipitation etc.

Ion-exchange of nickel by iminodiacetic acid chelating resin Chelex 100

The distribution coefficient ( K D) of trace nickel on an iminodiacetate-chelating resin Chelex 100 increased with pH to a peak value close to 2 000 000 ml/g at pH of about 5. At higher pH values the K D dropped to 5000 ml/g due to competition of an unidentified complexing agent. In equilibrium of three-component Na/H/Ni ion-exchange system, H/Ni exchange was found to be dominant in the pH range up to 8 and in Na concentration up to 6 mol/l. The practical ion-exchange capacity for nickel was 2.15 mmol/g (4.3 meq/g).

Evaluation of Polymeric Supports for Immobilizing Biomass to Prepare Sorbent Materials for Metals

Abstract Five polymeric materials, namely, styrene divinylbenzene, ethyl acrylate-ethylene glycol dimethacrylate, ethyl acrylate-methyl methacrylate-ethylene glycol dimethacrylate, polysulfone, and silica gel, were evaluated as supports for immobilizing biomass of the common brown seaweed alga, Sargassum fluitans, for use as metal sorbents. Small ion exchange columns were prepared containing one gram of sorbent. Solutions of metal ions at pH of 5.5, with the exception of gold for which a pH of 2 was used, were passed through the columns to trap the metals. Bound metals were subsequently stripped from the columns with 1 M nitric acid. Styrene divinylbenzene, polysulfone, and silica gel were found to be the most ideal matrices for immobilizing biomass. Breakthrough curves for the polymeric sorbents were similar to an iminodiacetic acid chelating resin, but the total metal adsorbing capacity of each biosorbent was considerably less than chelating resin. However, the resin swelling commonly associated with chelating resins when using strong acid stripping agents was not observed.

Copper(II)-iminodiacetic acid chelating resin as a stationary phase in the immobilized metal ion affinity chromatography of some aromatic amines

Styrene-divinylbenzene copolymer 60–80 mesh was used as the matrix and ground to a reasonable particle size in a colloid mill. Small and uniform particles (5–15 μm) can be obtained in a laboratory-made continuous acetone elutriation device. After elutriation the iminodiacetic acid (IDA) chelating resin was synthesized, and the infrared spectrum of the product indicated that the synthetic reaction is effective. the Cu(II)-modified IDA chelating resin was used as a stationary phase in high-performance immobilized metal ion affinity chromatography, packed into a column by the high-pressure slurry-packing technique. Methanol, to which ammonia was added as a competitive ligand, was used as the mobile phase for the separation of aromatic amines. The retention value of aromatic amines depends mainly on their basicity and molecular size. The results showed that some aromatic amines can be separated with the Cu(II)-IDA column.

Improved method for investigation of copper metabolism in patients with Wilson's disease using 64Cu

A radiochemical method for the separation of albumin- and ceruloplasminbound 64Cu from serum is described. Separation was achieved by column chromatography with an iminodiacetic acid-chelating resin at pH 5.0 and 40°. The experimental details for the separation are given.