Journal
BIORESOURCE TECHNOLOGY
Volume 184, Issue -, Pages 395-404Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.10.018
Keywords
Defatted algal biomass; Langmuir and Freundlich adsorption isotherm; Methylene blue; Specific surface area; Kinetics
Funding
- Department of Biotechnology (DBT), Government of India [BT/PR1311/PBD/26/267/2011]
- Council of Scientific and Industrial Research (CSIR)
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The present study investigates the use of defatted algal biomass (DAB) as a non-conventional low cost adsorbent. The maximum adsorption capacity of biomass (raw, defatted and sulfuric acid pretreated DAB) was determined by liquid phase adsorption studies in batch mode for the removal of methylene blue present at various concentrations (1, 2, 3, 4, and 5 mg L (1)) from aqueous solutions. The data was well fitted with Langmuir and Freundlich isotherms. The maximum adsorption capacity for raw, defatted and sulfuric acid pretreated DAB was found to be 6.0, 7.73 and 7.80 mg g (1), respectively. The specific surface area of raw, defatted and sulfuric acid pretreated DAB was estimated to be 14.70, 18.94, and 19.10 m(2) g (1), respectively. To evaluate the kinetic mechanism that controls the adsorption process, pseudo-first order, pseudo-second order, intraparticle diffusion and particle diffusion has been tested. The data fitted quite well with pseudo-second order kinetic model. (C) 2014 Elsevier Ltd. All rights reserved.
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