A kinetic, equilibrium and thermodynamic study of L-phenylalanine adsorption using activated carbon based on agricultural waste (date stones)
Document title: A kinetic, equilibrium and thermodynamic study of L-phenylalanine adsorption using activated carbon based on agricultural waste (date stones)
Journal: Journal of applied research and technology
Database: PERIÓDICA
System number: 000403225
ISSN: 1665-6423
Authors: 1
1
1
1
Institutions: 1University of Sciences and Technology Houari Boumediene, Faculty of Chemistry, EL-Alia. Argelia
Year:
Season: Oct
Volumen: 14
Number: 5
Pages: 354-366
Country: México
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English abstract The main purpose of this work is to produce low cost activated carbons from date stones wastes for the adsorption of L-phenylalanine. The activated carbons were prepared by chemical activation with KOH (ACK) and ZnCl2 (ACZ) and characterized by scanning electron microscopy, N2 adsorption-desorption isotherms and FT-IR spectroscopy. Both The activated carbons ACK and ACZ have high specific surface areas and large pore volumes, favorable for the adsorption. Batch experiments were conducted to determine the adsorption capacities. A Strong dependence of the adsorption capacity on pH was observed, the capacity decreases with increasing pH up to optimal value of 5.7. The adsorption follows a pseudo-second order kinetic model. Additionally, the equilibrium adsorption data were well fitted to the Langmuir isotherm, and the maximum adsorption capacities of L-phenylalanine onto ACK and ACZ were 188.3 and 133.3 mg g−1 at pH 5.7, respectively. The thermodynamic study revealed that the adsorption of L-phenylalanine onto activated carbons was exothermic in nature. The proposed adsorption mechanisms take into account the hydrophobic and electrostatic interactions which played the critical roles in the L-phenylalanine adsorption
Disciplines: Química
Keyword: Ingeniería química,
Fenilalanina,
Isoterma de adsorción,
Carbón activado,
Superficie de absorción
Keyword: Chemistry,
Chemical engineering,
Phenylalanine,
Adsorption isotherms,
Activated carbon,
Sorbent surface
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