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The fast recovery of gold (III) ions from aqueous solutions using raw date pits : kinetic, thermodynamic and equilibrium studies
Author
Source
Journal of Saudi Chemical Society
Issue
Vol. 20, Issue 6 (30 Nov. 2016), pp.615-624, 10 p.
Publisher
Publication Date
2016-11-30
Country of Publication
Saudi Arabia
No. of Pages
10
Main Subjects
Abstract EN
The recovery of Au(III) ions from aqueous solutions employing raw date pits (RDPs) has been systematically investigated in this paper.
The morphology, the specific surface area, and the functional groups of RDPs were analyzed using scanning electron microscopy, the methylene blue adsorption method, and FT-IR spectra, respectively.
The adsorption of Au(III) onto date pits was achieved quantitatively (90% ± 3.4%) after 90 min of shaking in an aqueous medium containing 0.5 mol L_1 HCl.
The process of gold(III) ion recovery using RDPs was described by the adsorption coupled reduction mechanism which includes adsorption of Au(III) ions onto RDP surface, followed by the reduction of Au3+ to Au.
The kinetic data were studied using pseudo-first order, pseudo-second order and intraparticle diffusion models, and was found to follow closely the pseudo-second order model.
The batch equilibrium data fitted well to the Freundlich and Langmuir isotherm models, and maximum adsorption capacity of RDPs for Au(III) was 78 ±1.1 mg g_1 at 298 K which was relatively large compared to some adsorbents recently reported.
Thermodynamic parameters, namely DG, DH, and DS, showed that the adsorption of Au(III) onto RDPs is exothermic, spontaneous, and chemisorption at low temperature.
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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
American Psychological Association (APA)
al-Saidi, H. M.. 2016. The fast recovery of gold (III) ions from aqueous solutions using raw date pits : kinetic, thermodynamic and equilibrium studies. Journal of Saudi Chemical Society،Vol. 20, no. 6, pp.615-624.
https://search.emarefa.net/detail/BIM-716911
Modern Language Association (MLA)
al-Saidi, H. M.. The fast recovery of gold (III) ions from aqueous solutions using raw date pits : kinetic, thermodynamic and equilibrium studies. Journal of Saudi Chemical Society Vol. 20, no. 6 (Nov. 2016), pp.615-624.
https://search.emarefa.net/detail/BIM-716911
American Medical Association (AMA)
al-Saidi, H. M.. The fast recovery of gold (III) ions from aqueous solutions using raw date pits : kinetic, thermodynamic and equilibrium studies. Journal of Saudi Chemical Society. 2016. Vol. 20, no. 6, pp.615-624.
https://search.emarefa.net/detail/BIM-716911
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 623-624
Record ID
BIM-716911