Sorption studies on cresol red modified Amberlite IR 400(Cl-) resin: Binary and selective separation of Hg 2+ ions (original) (raw)
Related papers
2007
The sorption properties of the commercially available cationic exchange resin, Amberlite IRC-718, that has the iminodiacetic acid functionality, toward the divalent metal-ions, Fe 21 , Cu 21 , Zn 21 , and Ni 21 were investigated by a batch equilibration technique at 258C as a function of contact time, metal ion concentration, mass of resin used, and pH. Results of the study revealed that the resin exhibited higher capacities and a more pronounced adsorption toward Fe 21 and that the metal-ion uptake follows the order: Fe 21 > Cu 21 > Zn 21 >Ni 21. The adsorption and binding capacity of the resin toward the various metal ions investigated are discussed.
Ligands Sorption Studies on Transition Metal Ion Loaded Amberlite IRC-50
Langmuir, 1998
Ligands sorption of ammonia, diethanolamine, and triethanolamine on the cation exchanger Amberlite IRC-50 having Cu 2+ , Ni 2+ , and Zn 2+ ions was studied as a function of temperature 290-318 K and different initial concentrations 1-500 mmol‚L -1 . Sorption was found to follow the order Cu 2+ > Zn 2+ > Ni 2+ and ammonia > diethanolamine > triethanolamine. Desorption of metal cations from the exchanger to the aqueous phase was also observed when the temperature of the system was increased. The results were explained in terms of ligand sorption and ion exchange, which were found to be dependent upon the stabilities of the complexes inside the resin and in the aqueous solution and the basicity and hydrophobicity of the ligand involved. The ratio of metal released/amine sorbed was determined which indicated two possible mechanisms of ligand sorption. The data were explained with the help of mass action law. IR studies also confirmed the presence of metal complexes and metal-amine complexes inside the resin.
Chemical Engineering Journal, 2010
The removal of Cr(VI) from aqueous solution by two commercially available resins (Amberlite IRA96 and Dowex 1×8) was investigated. Batch adsorption processes were carried out as a function of time, adsorbent dosage, pH and temperature to evaluate the performance of the resins. The optimum pH for Cr(VI) adsorption was found as 3.0 for these resins. It was found that more than 93% removal was achieved under optimal conditions. The maximum adsorption capacities are 0.46 and 0.54 mmol/g of Amberlite IRA96 and Dowex 1×8 resin for Cr(VI) ion, respectively. The suitability of Freundlich and Langmuir adsorption models were investigated for Cr(VI)-resin equilibrium. A pseudo-second order kinetic model has been proposed to correlate the experimental data. The equilibrium adsorption level for Dowex 1×8 decreased with increasing temperature, while it increased for Amberlite IRA96.
Evaluation of chromium(VI) sorption efficiency of modified Amberlite XAD-4 resin
Arabian Journal of Chemistry, 2017
The present work deals with the removal of Cr(VI) from aqueous media by modified Amberlite XAD-4 (MAX-4) resin through the solid phase extraction method. Different parameters such as pH, dosage and temperature were optimized during the batch experiment. The experimental data were analyzed by Freundlich, Langmuir, Dubinin-Radushkevich (D-R) and Temkin equilibrium isotherms. Each characteristic parameter of isotherms was determined. The kinetic sorption experiments show that the sorption process follows pseudo second order kinetics. The sorption mechanism was investigated by Reichenberg (R-B) and Morris-Weber equations. From the thermodynamic parameters, it could be concluded that the sorption process is endothermic and spontaneous in nature. The interference and desorption studies were also performed. The results show that MAX-4 resin has the capability to remove Cr(VI) significantly from aqueous media even in the presence of interfering ions.
Adsorption of Malachite Green (MG) as a Cationic Dye on Amberlyst 15, an Ion-Exchange Resin
Journal of Environmental and Public Health, 2022
Crystals of malachite green (MG), being water-soluble, are effective agents applied to combat fungal and parasitic infections in fish. is study was conducted to evaluate the adsorption of MG as a cationic dye by polymeric resin Amberlyst 15. Changes in several parameters were observed, including the concentration of MG, pH, the adsorption rate and extent, and the temperature that might all affect the efficiency of adsorption. e adsorption method was described well by both the Redlich-Peterson and Langmuir isotherms with R 2 of 0.9933 and 0.9880, respectively. e kinetic information is consistent with the Freundlich isotherm model and pseudo-2nd-order kinetics model. Analysis of malachite green was executed by HPLC containing a Eurospher 100-5 C18 (25 cm × 4.5 mm, size of particle 5 μm) column, UV detector was set at 618 nm, and 125 mM ammonium acetate was adapted to pH 4.5 with formic acid-acetonitrile (45 : 55, v/v) as the moving phase. e limit of the discovery factor was 0.02 μgL. e negative value of ΔG°reveals the spontaneity of the absorption method. e positive value of ΔS°(333.1253 J/K mol) gives back randomness at the solid-liquid interface of sorption. e required adsorbent concentration was calculated for removing MG up to an extraction efficiency of 98.27% after 240 minutes.
Iranian Journal of Chemistry & Chemical Engineering-international English Edition, 2010
Salicylic acid-Formaldehyde-m-Cresol (SFM) terpolym er had been synthesized in DMF media by conventional method. The resulting resin had bee n characterized by FTIR spectra, elemental and thermogravimetric analyses. The morphology of SFM r esin had been studied by SEM and Optical photograph . Various parameters like rate of equilibration, effe ct of pH on ion exchange capacity and effect of con centration on ion exchange capacity had been studied. The maxi mum sorption capacities at 0.05M concentration for Ni(II) and Cu(II) were 0.7905 (pH-6.0) and 0.6315 (pH-5.5) mmol/g of dry resin respectively. The dist ribution coefficient (K d ) for five metal ions (Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II) ) were determined in various concentration of tartaric acid electrolyte at different pH. The quantitative separations of heavy met al ions and transition metal ions from their admixtures (Cu(II) - Pb(II), Pb(II)- Zn(II), Ni(II)- Cd(II)) had been performed by using distribution coefficient (K...
Biokemistri, 2011
Simple quantitative technique has been developed for assessing the exchange parameters of Amberlite IR-45 (OH) using column chromatographic techniques from the displacement of exchangeable hydroxyl ions of the resin by sulphate ions. The results obtained showed retention time of 33min, retention volume of 56.5cm 3 , void volume of 18cm 3 , and exchange capacity of 41mmole/g and exchange site density of 2.4682 x 10 22 sites /g.
Journal of the Science of Food and Agriculture, 2006
The sorption behaviour of carminic acid on a gel-type weak anion exchanger was evaluated in a finite bath. Equilibrium and kinetic studies were employed to characterise the system. Adsorption isotherms were found to follow the Langmuir expression. Concentration-time profiles were obtained in a stirred vessel. The sorption kinetics was unaltered provided that the particle suspension criterion was met. Analytical equations were found for quantitative description of the system and to assist in scale-up. Fluid-side effects and intraparticle resistance mechanisms were revealed. The fluid-side mass transfer coefficient (k f ) took an almost constant value of 2.6 × 10 −5 m s −1 under these experimental conditions. Amberlite IRA-67, owing to its gel structure, was treated so as to present a homogeneous diffusion type, and a solid diffusivity (D s ) value of 3.16 × 10 −10 m 2 s −1 was determined experimentally. This value was insensitive to stirrer speed and could be considered constant for further design purposes. Overall mass transfer in the system showed a mixed nature with a balanced contribution of both resistances (δ ≈ 1).
Cation exchange effective equilibrium distribution coefficients(K' d ) of 18 metal ions with resin Amberlite IR-120 have been determined in varying adipic acid [H 2 AA] concentrations, viz., 2.0×10 -2 _ 7.6×10 -2 M [H 2 AA]. Separation factors of metal ion species were calculated and some possible binary separations were worked out on the basis of their K' d values. An entirely different approach has been proposed for the association of adipate anion involving its partial exchange with the resin site along the complexation of the metal species.
Chemical Engineering Research and Design, 2012
The main purpose of this paper was to obtain a material with efficient adsorbing properties and selectivity, to recover the gold (III) from residual diluted solutions resulted from the electroplating process. In this regard, a material was obtained by physico-chemical functionalization of a chemically inert support with functional groups of nitrogen and carboxyl. As a source of functional groups glutamic acid was used, and Amberlite XAD7 type acrylic resin was used as solid support. In order to establish the mechanism of the adsorption process, kinetic, thermodynamic and equilibrium studies were performed. The maximum adsorption capacity of the material has been established, and a gold (III) recovery process has been proposed using thermal decomposition of the exhausted adsorbed material. Main objective of this study was to evaluate an environmental friendly adsorbent material to recover gold from secondary industrial sources. Due to their specific physical and chemical properties, precious metals are widely used in many areas, such as in the electrical and electronics industry, in various chemical processes, in the manufacture of catalysts, in the manufacture of corrosion resistant materials, and in the production of jewellery 1-5. Over the last four decades, considerable amounts of gold have been used to produce electrical and electronic systems, because of their excellent electrical conductivity, low contact electrical resistance and remarkable corrosion resistance, being suitable for use in various connections 6,7. It is also known that historically, precious metals were and also have remained important in the manufacture of coins, being known worldwide as currency forms, according to ISO 4217 2. As a result of the continued decline in gold quality and high demand on the market, its recovery becomes crucial and inevitable 8,9. The recovery process is effective if the recovery cost is much lower than the value of the precious recovered metal. In addition, restrictions imposed by environmental authorities on waste disposal require economic viability and green technologies 6,8. Mechanical, pyro-metallurgical, hydrometallurgical separation and bio-metallurgical technologies have been widely used for the recovery of gold from secondary sources 10-13. Gold was mainly recovered from ores through the cyanide process 14-17 , a pollutants generating method with a significant negative impact on the environment; a worldwide controversial; other gold recovery agents are: ammonium thiosulphate 18 , royal water 19 , thiourea 20 , tiosulfates 21 , ammonia, iodine, natural organic acids, bromine, sodium sulphide 22 , and so on. Processes employing these chemical reagents are separation and purification processes (such as cementations, reduction, adsorption, coagulation, solvent extraction, ion exchange, gravity separation, ionic flotation, and so on 6). Some of the materials used for gold recovery, with adsorbent properties are: active carbon 23 , mesoporous absorbents 24 , chitosan or chemically modified oxides by functionalization 25,26. In this study, the obtained material has selective, relatively inexpensive, environmental friendly adsorbent properties and can be used with good results for recovering gold from dilute solutions which resulted as