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Efficiency of almond gum as a low-cost adsorbent for methylene blue dye removal from aqueous solutions.

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Title:	Efficiency of almond gum as a low-cost adsorbent for methylene blue dye removal from aqueous solutions.
Authors:	Bouaziz, Fatma¹ fatma.bouaziz22@yahoo.fr, Koubaa, Mohamed², Kallel, Fatma¹, Chaari, Fatma¹, Driss, Dorra¹, Ghorbel, Raoudha Ellouz^1,3, Chaabouni, Semia Ellouz^1,3
Source:	Industrial Crops & Products. Nov2015, Vol. 74, p903-911. 9p.
Subjects:	Almond, Methylene blue, Thiazine dyes, Aqueous solutions, Prunus
Abstract:	This study was aimed to use almond gum as a potential adsorbent to remove methylene blue dye from aqueous solution. The adsorbent was characterized by scanning electron microscopy and Fourier transform infrared spectrometer. The adsorption of methylene blue on almond gum material was studied as a function of almond gum dose (0.05–2 g), pH solution (3–10), contact time (up to 240 min) and initial concentration (20–200 mg L −1 ), temperature (303.16 K, 313.16 K, and 323.16 K), and agitation(up to 250 rpm). The influence of these parameters on the adsorption capacity was studied using the batch process. The experimental data were analyzed by the Langmuir, Freundlich, and Tempkin isotherms. Results show that the data fitted well with the Freundlich isotherm ( R 2 = 0.99). The maximum adsorption capacities of methylene blue onto almond gum were found to be 250 mg g −1 , 333.33 mg g −1 , and 500 mg g −1 at 303.16 K, 313.16 K, and 323.16 K, respectively. The kinetic data were fitted to the pseudo-first-order, pseudo-second-order and intraparticle diffusion models, and it is revealed that adsorption of methylene blue onto almond gum follows closely the pseudo-second-order kinetic model. Thermodynamic parameters such as enthalpy change (Δ H ), entropy change (Δ S ), and free energy change (Δ G ) were evaluated to predict the nature of adsorption. The calculated values of Δ H , Δ S , and Δ G for uptake of methylene blue were 52.078 kJ mol −1 , 177.91 J mol −1 K −1 , and −18.56 kJ mol −1 , respectively. These results indicate the endothermic and spontaneous nature of the adsorption process. The results revealed that almond gum adsorbent is potentially an efficient and low-cost adsorbent for adsorption of methylene blue. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This study was aimed to use almond gum as a potential adsorbent to remove methylene blue dye from aqueous solution. The adsorbent was characterized by scanning electron microscopy and Fourier transform infrared spectrometer. The adsorption of methylene blue on almond gum material was studied as a function of almond gum dose (0.05–2 g), pH solution (3–10), contact time (up to 240 min) and initial concentration (20–200 mg L −1 ), temperature (303.16 K, 313.16 K, and 323.16 K), and agitation(up to 250 rpm). The influence of these parameters on the adsorption capacity was studied using the batch process. The experimental data were analyzed by the Langmuir, Freundlich, and Tempkin isotherms. Results show that the data fitted well with the Freundlich isotherm ( R 2 = 0.99). The maximum adsorption capacities of methylene blue onto almond gum were found to be 250 mg g −1 , 333.33 mg g −1 , and 500 mg g −1 at 303.16 K, 313.16 K, and 323.16 K, respectively. The kinetic data were fitted to the pseudo-first-order, pseudo-second-order and intraparticle diffusion models, and it is revealed that adsorption of methylene blue onto almond gum follows closely the pseudo-second-order kinetic model. Thermodynamic parameters such as enthalpy change (Δ H ), entropy change (Δ S ), and free energy change (Δ G ) were evaluated to predict the nature of adsorption. The calculated values of Δ H , Δ S , and Δ G for uptake of methylene blue were 52.078 kJ mol −1 , 177.91 J mol −1 K −1 , and −18.56 kJ mol −1 , respectively. These results indicate the endothermic and spontaneous nature of the adsorption process. The results revealed that almond gum adsorbent is potentially an efficient and low-cost adsorbent for adsorption of methylene blue. [ABSTRACT FROM AUTHOR]
ISSN:	09266690
DOI:	10.1016/j.indcrop.2015.06.007