Synthesis of Sodium Alginate-Derived Carbon Aerogel for Adsorptive Removal of Methylene Blue

Document Type: Research Article

Authors

1 Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center

2 Department of Energy, Materials and Energy Research Center

Abstract

In this study carbon aerogel was prepared from sodium alginate via sol-gel technique. The morphological study clearly revealed that the synthesized aerogel possessed a highly porous structure with a specific surface area of 470 m2 g-1. The applicability of the aerogel as an adsorbent was examined in methylene blue removal. Adsorption isotherms, kinetics and thermodynamic studies of Removal of MB from aqueous solutions were conducted in batch system. The effect of pH and adsorbent dosage on adsorption of MB was investigated. The equilibrium data were best fitted to Langmuir model with maximum adsorption capacity of 70.42 mg g-1. The adsorption kinetic of MB followed the pseudo-first-order models. Thermodynamic analysis of the results indicated that adsorption is a physical process and is in agreement with data obtained from the Dubinin−Radushkevich isotherm model. Removal of MB process was spontaneous and endothermic.

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