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Adsorption of methyl orange from aqueous solution by aminated pumpkin seed powder: Kinetics, isotherms, and thermodynamic studies

Title
Adsorption of methyl orange from aqueous solution by aminated pumpkin seed powder: Kinetics, isotherms, and thermodynamic studies
Authors
Subbaiah, Munagapati VenkataKim, Dong-Su
Ewha Authors
김동수
SCOPUS Author ID
김동수scopus
Issue Date
2016
Journal Title
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
ISSN
0147-6513JCR Link1090-2414JCR Link
Citation
vol. 128, pp. 109 - 117
Keywords
AdsorptionMethyl orangeKineticsIsothermsThermodynamics
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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.
DOI
10.1016/j.ecoenv.2016.02.016
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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