Experimental and theoretical investigation of sorption kinetics of beryllium on Amberlite-IR-120 sorbent

Othman, Sameh H.; Shabaan, M.; Demerdash, M.; Saleh, Mahmoud M.

doi:10.1016/j.jnucmat.2009.04.001

Cited by 15 publications

(7 citation statements)

References 28 publications

(23 reference statements)

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“…A further similar increase of the K value provides thus an effective impact on the conversion extent, which can be reasonably understood as this parameter includes the reaction rate constant that is responsible for the speed of reaction. These findings agree with those obtained by Othman et al [1][2][3][4][5]. .…”

Section: Effect Of Resin-specific Reaction Rate Parametersupporting

confidence: 93%

“…controlled [1][2][3][4][5]. When ratio is high, the internal diffusion dominates and is the rate determining step so that…”

Section: Theoretical Studymentioning

confidence: 99%

“…Similar to other fluid-solid reactors, the global kinetics of the reactor is determined by mass transfer from the bulk fluid to the interior of the solid phase and/or by the chemical reaction. Generally, the internal mass transfer inside the solid particle offers much greater resistance than other steps [1][2][3][4][5], so that it can be considered as the rate-determining step.…”

Section: Introductionmentioning

confidence: 99%

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Heavy metal extraction by a counter-flow moving bed reactor

Ali¹,

Abdelaziz²,

Elbakhshawangy³

et al. 2012

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In the current study, the extraction of heavy metal ions (Zn2+, Cu2+ and Cd2+) is suggested to be achieved by a counter-flow moving bed reactor. The studies are made at high (1 × 10-2 M) and low (1 × 10-4 M) initial concentrations of the heavy metal ions. Theoretical and experimental studies are made on the extraction of the metal ions with impregnated Amberlite resins, prepared by sorption of an organic extractant into the resin. The study suggests structural, kinetic and hydrodynamic parameters that shall be investigated prior to the design of a moving bed reactor. The effect of these parameters on the adsorption extent is theoretically investigated through the proposed model. Analyses of the experimentally estimated external, internal and chemical rate parameters show that the process is controlled by chemical reaction in both concentrations as the chemical reaction rate parameter is significantly smaller than both the internal and the external diffusion rate parameters

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Section: Effect Of Resin-specific Reaction Rate Parametersupporting

confidence: 93%

“…controlled [1][2][3][4][5]. When ratio is high, the internal diffusion dominates and is the rate determining step so that…”

Section: Theoretical Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heavy metal extraction by a counter-flow moving bed reactor

Ali¹,

Abdelaziz²,

Elbakhshawangy³

et al. 2012

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“…On the basis of these features, beryllium is used in nuclear reactors as an effective neutron reflector and moderator . However, beryllium separation from its solutions is a rather difficult process; only few materials are able to take up Be because of its relatively small size.…”

Section: Introductionmentioning

confidence: 99%

“…With the highly toxic and carcinogenic effects of beryllium and its compounds, studies on their removal from aqueous solutions are few compared to the huge number of articles about other metals …”

Section: Introductionmentioning

confidence: 99%

Chitosan/MCM‐41 nanocomposites for efficient beryllium separation

Morsi

Elsherief

Shabaan

et al. 2017

J of Applied Polymer Sci

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Chitosan nanoparticles (Ch NPs) with individual particles 10-30 nm in size and average aggregate sizes of 240 nm were prepared via ionic gelation. Ordered mesoporous Mobil Composition of Matter No. 41 (MCM-41) with a surface area of 1590 m 2 /g was prepared via a sol-gel method. The nanocomposites were prepared via the in situ dispersion of MCM-41 in chitosan followed by ionic gelation with a multivalent anion to produce MCM-41-impregnated Ch NPs or via the mixture of dispersed MCM-41 with preprepared Ch NPs to produce Ch NPs supported on MCM-41. The beryllium-uptake efficiency was studied with different pH values, contact times, and initial Be(II) concentrations. The maximum achieved uptake efficiencies of the nanocomposites (95% and 96%) were superior to that of MCM-41 (38%) and higher than that of Ch NPs (90%). The nanocomposite formulas facilitated post-treatment separation while maintaining a high beryllium-uptake efficiency. The Be(II)-uptake process for all of the materials followed the pseudo-second-order kinetic model and both the Langmuir and Freundlich isotherms.

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