Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 128, Issue -, Pages 109-117Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2016.02.016
Keywords
Adsorption; Methyl orange; Kinetics; Isotherms; Thermodynamics
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Funding
- R&D Program for Society of the National Research Foundation (NRF) - Ministry of Science, ICT & Future Planning [NRF-2013M3C8A3078596]
- R&D Center for Valuable Recycling (Global-Top Environmental Technology Development Program) - Ministry of Environment [GT-11-C-01-070-0]
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Present research discussed the utilization of aminated pumpkin seed powder (APSP) as an adsorbent for methyl orange (MO) removal from aqueous solution. Batch sorption experiments were carried to evaluate the influence of pH, initial dye concentration, contact time, and temperature. The APSP was characterized by using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The experimental equilibrium adsorption data were fitted using two two-parameter models (Langmuir and Freundlich) and two three-parameter models (Sips and Toth). Langmuir and Sips isotherms provided the best model for MO adsorption data. The maximum monolayer sorption capacity was found to be 200.3 mg/g based on the Langmuir isotherm model. The pseudo-first-order and pseudo second -order model equations were used to analyze the kinetic data of the adsorption process and the data was fitted well with the pseudo-second-order kinetic model (R-2 > 0.97). The calculated thermodynamic parameters such as AG, AH and AS from experimental data showed that the sorption of MO onto APSP was feasible, spontaneous and endothermic in the temperature range 298-318 K. The FUR results revealed that amine and carboxyl functional groups present on the surface of APSP. The SEM results show that APSP has an irregular and porous surface which is adequate morphology for dye adsorption. Desorption experiments were carried to explore the feasibility of adsorbent regeneration and the adsorbed MO from APSP was desorbed using 0.1 M NaOH with an efficiency of 93.5%. Findings of the present study indicated that APSP can be successfully used for removal of MO from aqueous solution. (C) 2016 Elsevier Inc. All rights reserved.
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