Kinetics of ion exchange of alkaline earth metal ions on acrylamide cerium(IV) phosphate: a fibrous ion exchanger

Varshney, K. G.; Gupta, Puja; Tayal, Namrta

doi:10.1016/s0927-7765(02)00117-0

Cited by 13 publications

(7 citation statements)

References 7 publications

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“…For the particle diffusion controlling model, the main assumptions made are that (1) the resistance of film diffusion around the resin particles is negligible; and (2) the effective diffusion coefficient for binary ion exchange is constant . This phenomenon is described by Fick's first law of diffusion.…”

Section: Resultsmentioning

confidence: 99%

Lead removal from aqueous solutions by 732 cation‐exchange resin

et al. 2015

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Kinetics and thermodynamics of the removal of Pb2+ from an aqueous solution by 732 cation‐exchange resin in hydrogen type (732‐CR) were studied in the temperature range of 298–328 K and Pb2+ concentration range of 5–50 mol/m3. The effects of ion exchange temperature and initial lead ion concentration on the time evolution of the experimental concentration for the metal ion were investigated. Ion exchange kinetics of Pb2+ onto 732‐CR follow the Nernst‐Planck equation and unreacted‐core model (UCM). The diffusion coefficients of counter ions and the efficient diffusion coefficient of lead ions within the resin were calculated. The results show that the ion exchange process is favoured under the particle diffusion control mechanism. The ion exchange isotherm data agreed closely with the Langmuir isotherm. The maximum monolayer exchange capacity for Pb2+ was found to be 484.0 mg/g at 308 K. Thermodynamic studies show that Pb2+ onto 732‐CR is spontaneous and exothermic in nature. The ion exchange processes were verified by Energy Disperse Spectroscopy (EDS).

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Section: Resultsmentioning

confidence: 99%

Lead removal from aqueous solutions by 732 cation‐exchange resin

et al. 2015

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“…The pH was adjusted by the addition of NH 4 OH which obtained from Fluka. Poly-acrylamide based Ce(IV) phosphate (PAM-CP) had been previously prepared (9). One volume of ceric ammonium nitrate solution was added in two volumes of (1:1) mixture of H 3 PO 4 and acrylamide solutions by dropwise addition with constant stirring using a magnetic stirrer at a temperature of 70 C. The resulting slurry obtained under these conditions is stirred for 4 hours, filtered, and washed with demineralized water (pH ¼ 4).…”

Section: Experimental Materialsmentioning

confidence: 99%

Removal and Separation of Some Radionuclides by Poly-acrylamide Based Ce(IV) Phosphate from Radioactive Waste Solutions

Metwally

El-Gammal

Aly

et al. 2011

Separation Science and Technology

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Removal of cesium, cobalt, and europium ions from radioactive waste solutions using poly-acrylamide based Ce(IV) phosphate material was investigated using both batch and fixed bed column techniques. The effect of pH, initial metal ion concentration, and temperature had been studied. Simple kinetic and thermodynamic models had been applied from which the mechanism of the process and the thermodynamic parameters were determined. The positive values of enthalpy change, DH, obtained for the three metal ions confirmed the endothermic nature of the sorption process and suggested that chemisorption is the predominant sorption mechanism. The high positive values found for the entropy change, DS, show the increased randomness at the solid/solution interface. The obtained negative values of free energy change, DG, indicating the feasibility and the spontaneous nature of the sorption processes. Breakthrough data were investigated in a fixed bed column at room temperature (298 K) under the effect of various process parameters like bed depth, flow rate, and initial ion concentration. The results showed that the overall bed capacity decreased with increasing flow rate and increased with increasing initial metal ion concentrations and bed depth.

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“…The material thus obtained was then washed with distilled water to remove the excess acid and dried to get the sorbent [14]. In a similar fashion, polyacrylamide Al(III) and polyacrylamide Zr(IV) phosphate ion exchangers were obtained with Al(NO 3 ) 3 ·9H 2 O and ZrOCl 2 ·8H 2 O instead of Ce(SO 4 ) 2 ·4H 2 O.…”

Section: Synthesismentioning

confidence: 99%