Adsorption of phenylalanine on layered double hydroxides: effect of temperature and ionic strength

In this work we report the adsorption of phenylalanine (Phe) on Magnesium Aluminum Layered Double Hydroxides (Mg–Al–CO₃-LDH) at two different temperatures (298 and 310 K) and under two distinct ionic strength conditions (with and without the addition 0.1 M of NaCl). The adsorption isotherms exhibit...

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Bibliographic Details
Published in:Journal of materials science 2008, Vol.43 (2), p.434-439
Main Authors: Silvério, Fabiano, dos Reis, Márcio José, Tronto, Jairo, Valim, João Barros
Format: Article
Language:English
Subjects:
adsorbents
Adsorption
Aluminum
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Electrokinetics
Exact sciences and technology
Fourier transform infrared spectroscopy
General and physical chemistry
Hydrophobicity
Hydroxides
ionic strength
Ions
Isotherms
Magnesium
Materials Science
Phenylalanine
Polymer Sciences
sodium chloride
Solid Mechanics
Solid-liquid interface
sorption isotherms
Strength
Surface chemistry
Surface physical chemistry
temperature
Temperature effects
Waste water
Wastewater
zeta potential
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Summary:In this work we report the adsorption of phenylalanine (Phe) on Magnesium Aluminum Layered Double Hydroxides (Mg–Al–CO₃-LDH) at two different temperatures (298 and 310 K) and under two distinct ionic strength conditions (with and without the addition 0.1 M of NaCl). The adsorption isotherms exhibit the same profile in all conditions, and they only differ in the amount of removed Phe. At lower ionic strength, the isotherms are almost identical at both temperatures, except for the last points, where the increase in temperature causes a decrease in the amount of adsorbed Phe. An increase in ionic strength results in a decrease in Phe adsorption. The electrokinetic potential decreases as the amount of adsorbed Phe increases, and only positive values are observed. This indicates that the surface of the adsorbent is not totally neutralized and suggests that more Phe could be removed by adsorption. The presence of Phe on the solid is confirmed by FTIR spectra, which present the specific bands assigned to Phe. The hydrophobicity of the amino acid probably contributes to its extraction, thus enabling the removal of a great amount of Phe. In conclusion, LDH is potentially applicable in the removal of Phe from wastewater.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-007-2202-9