Kinetics of isotopic exchange between strontium polymolybdate and strontium ions in aqueous solution

Atun, Gülten; Bilgin, Binay; Kilislioğlu, Ayben

doi:10.1016/s0969-8043(02)00052-0

Cited by 18 publications

(8 citation statements)

References 7 publications

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“…The positive G ‡ values suggest the existence of an energy barrier and that the reaction is non-spontaneous process [24]. The positive values of H ‡ indicate the endothermic nature for the diffusion process.…”

Section: Kinetic Studiesmentioning

confidence: 97%

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Modeling batch kinetics and thermodynamics of zinc and cadmium ions removal from waste solutions using synthetic zeolite A

El-Kamash

Zaki

Geleel³

2005

Journal of Hazardous Materials

254

102

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Section: Kinetic Studiesmentioning

confidence: 97%

“…The negative values of entropy of activation obtained for the sorption of both metal ions normally reflect that no significant change occurs in the internal structure of the zeolite solid matrix during the sorption of ions [23]. The Gibbs free energy of activation, G ‡ , was calculated from the well-known equation [24]:…”

Section: Kinetic Studiesmentioning

confidence: 99%

Modeling batch kinetics and thermodynamics of zinc and cadmium ions removal from waste solutions using synthetic zeolite A

El-Kamash

Zaki

Geleel³

2005

Journal of Hazardous Materials

254

102

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“…The positive value of entropy change reflects good affinity of erbium ions towards the sorbent and the increasing randomness at the solid-solution interface during the sorption process [32]. The positive ΔG values suggest the existence of an energy barrier and that the reaction is non-spontaneous process [33].…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

Sorption of rare-earth erbium from aqueous solution onto sol-gel-derived zirconia

Salem

Yakout

2016

Hem Ind

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Zirconia powder was synthesized via sol gel method and used for erbium sorption. The adsorption is strongly dependent on pH of the medium where the removal efficiency increases as the pH turns to alkaline range. The process was very fast initially and maximum adsorption was attained within 60 min of contact. Pseudo-second-order model and homogeneous particle diffusion model (HPDM) was found to be the best to correlate the diffusion of erbium into zirconia particles. Adsorption thermodynamic parameters were calculated. Erbium adsorption is an endothermic (ΔH > 0) and good affinity of erbium ions towards the zirconia (ΔS > 0).

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“…The positive value of entropy change (ΔS) reflects good affinity of cesium ions towards the sorbent and the increasing randomness at the solid-solution interface during the sorption process [36]. The positive Δ G * values suggest the existence of an energy barrier and that the reaction is a non-spontaneous process [37].…”

Section: Resultsmentioning

confidence: 99%

Adsorption Characteristics of Sol Gel-Derived Zirconia for Cesium Ions from Aqueous Solutions

Yakout

Hassan

2014

Molecules

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Zirconia powder was synthesized via a sol gel method and placed in a batch reactor for cesium removal investigation. X-ray analysis and Fourier transform infrared spectroscopy were utilized for the evaluation of the developed adsorbent. The adsorption process has been investigated as a function of pH, contact time and temperature. The adsorption is strongly dependent on the pH of the medium whereby the removal efficiency increases as the pH turns to the alkaline range. The process was initially very fast and the maximum adsorption was attained within 60 min of contact. A pseudo-second-order model and homogeneous particle diffusion model (HPDM) were found to be the best to correlate the diffusion of cesium into the zirconia particles. Furthermore, adsorption thermodynamic parameters, namely the standard enthalpy, entropy, and Gibbs free energy, were calculated. The results indicate that cesium adsorption by zirconia is an endothermic (ΔH > 0) process and good affinity of cesium ions towards the sorbent (ΔS > 0) was observed.

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Kinetics of isotopic exchange between strontium polymolybdate and strontium ions in aqueous solution

Cited by 18 publications

References 7 publications

Modeling batch kinetics and thermodynamics of zinc and cadmium ions removal from waste solutions using synthetic zeolite A

Modeling batch kinetics and thermodynamics of zinc and cadmium ions removal from waste solutions using synthetic zeolite A

Sorption of rare-earth erbium from aqueous solution onto sol-gel-derived zirconia

Adsorption Characteristics of Sol Gel-Derived Zirconia for Cesium Ions from Aqueous Solutions

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