Removal of methylene blue dye from aqueous solutions by a new chitosan/zeolite composite from shrimp waste: Kinetic and equilibrium study |
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| Authors: | Mohammad Hadi Dehghani Aliakbar Dehghan Hossein Alidadi Maryam Dolatabadi Marjan Mehrabpour Attilio Converti |
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| Affiliation: | 1.School of Public Health, Department of Environmental Health Engineering,Tehran University of Medical Sciences,Tehran,Islamic Republic of Iran;2.Institute for Environmental Research,Center for Solid Waste Research,Tehran,Islamic Republic of Iran;3.Health Sciences Research Center, Department of Environmental Health Engineering, School of Health,Mashhad University of Medical Sciences,Mashhad,Islamic Republic of Iran;4.Department of Civil, Chemical and Environmental Engineering, Chemical Engineering Pole,Genoa University,Genoa,Italy |
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| Abstract: | The adsorption of methylene blue dye (MBD) from aqueous solutions was investigated using a new composite made up of shrimp waste chitosan and zeolite as adsorbent. Response surface methodology (RSM) was used to optimize the effects of process variables, such as contact time, pH, adsorbent dose and initial MBD concentration on dye removal. The results showed that optimum conditions for removal of MBD were adsorbent dose of 2.5 g/L and pH of 9.0, and initial MBD concentration of 43.75 mg/L and contact time of 138.65 min. The initial concentration of dye had the greatest influence on MBD adsorption among other variables. The experimental data were well fitted by the pseudo-second order kinetic model, while the Freundlich isotherm model indicated a good ability for describing equilibrium data. According to this isotherm model, maximum adsorption capacity of the composite was 24.5 mg/g. Desorption studies showed that the desorption process is favored at low pH under acidic conditions. |
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