Adsorptive removal of malachite green from aqueous solutions by almond gum: Kinetic study and equilibrium isotherms

This work aimed at investigating the potential of almond gum as low cost adsorbent for the removal of the cationic dye; malachite green from aqueous solutions. Almond gum was first analyzed by scanning electron microscopy (SEM) and Fourier transforms infrared spectroscopy (FTIR), and then the adsorp...

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Bibliographic Details
Published in:International journal of biological macromolecules 2017-12, Vol.105 (Pt 1), p.56-65
Main Authors: Bouaziz, Fatma, Koubaa, Mohamed, Kallel, Fatma, Ghorbel, Rhoudha Ellouz, Chaabouni, Semia Ellouz
Format: Article
Language:English
Subjects:
Adsorption
Almond gum
Chemical and Process Engineering
Diffusion
Engineering Sciences
Entropy
Food and Nutrition
Hydrogen-Ion Concentration
Kinetics
Life Sciences
Malachite green
Plant Gums - chemistry
Prunus dulcis - chemistry
Rosaniline Dyes - chemistry
Rosaniline Dyes - isolation & purification
Solutions
Water - chemistry
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
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Summary:This work aimed at investigating the potential of almond gum as low cost adsorbent for the removal of the cationic dye; malachite green from aqueous solutions. Almond gum was first analyzed by scanning electron microscopy (SEM) and Fourier transforms infrared spectroscopy (FTIR), and then the adsorption behavior was studied in batch system. The effects of the adsorption parameters (adsorbent dose, pH, contact time, particle size, initial dye concentration, temperature and agitation) on the dye removal have been studied. Adsorption equilibrium and isotherms were evaluated depending on temperature using the isotherms of Freundlich, Langmuir, and Tempkin. The obtained result showed that both Langmuir and Freundlich models were adapted to study the dye sorption. The maximum adsorption capacities were equal to 172.41mg/g, 181.81mg/g, and 196.07mg/g at 303.16K, 313.16K, and 323.16K, respectively. The kinetics of sorption were following the pseudo-second order model. The thermodynamic changes in enthalpy (ΔH), entropy (ΔS), and free energy (ΔG) indicated that the adsorption of malachite green at the surface of almond gum is endothermic and occurs spontaneously. Desorption experiments were conducted to regenerate almond gum, showing great desorption capacity when using HCl at pH 2.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2017.06.106