Journal
CARBOHYDRATE POLYMERS
Volume 102, Issue -, Pages 192-198Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.10.104
Keywords
Alginate beads; Composite; Activated carbon; Coconut shells; Methylene blue
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Funding
- research sector of Damanhour University
- Deanship of Scientific Research at King Saud University [RGP-VPP-201]
- CEITEC - Central European Institute of Technology - excellent teams [CZ.1.07/2.3.00/30.0005]
- European Social Fund
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Three adsorbents, calcium alginate beads (AB), sodium hydroxide activated carbon based coconut shells (C), and calcium alginate/activated carbon composite beads (ACB) were prepared. Their textural properties were characterized by N-2-adsorption at 196 degrees C and scanning electron microscopy. The porosity, surface area and total pore volume of C > ACB > AB, but AB adsorbent was more acidic function groups more than the other adsorbents. Adsorption experiments were conducted to examine the effects of adsorbent dosage, pH, time, temperature and initial concentration of methylene blue. Methylene blue adsorption on C, AB and ACB was observed at pH > 6 to avoid the competition of H+. The amount of dye adsorbed increases as the adsorbent dosage increase. Adsorption of dye follows pseudo-second order mechanism. Thermodynamic studies show spontaneous and endothermic nature of the overall adsorption process. (C) 2013 Elsevier Ltd. All rights reserved.
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