Adsorption capacity of sodium dodecyl sulfate activation okara for methylene blue on aqueous solution

Agricultural waste okara (OA) was selected as a precursor to prepare low-cost adsorbent for the removal of methylene blue (MB). Sodium dodecyl sulfate (SDS), as a kind of anionic surfactant, was loaded onto okara (SOA) to achieve high adsorption ability. Scanning electron microscopy, Fourier transfo...

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Bibliographic Details
Published in:The Korean journal of chemical engineering 2022, 39(1), 262, pp.198-208
Main Authors: Yu, Cailian, Li, Bolin, Zhang, Kexin, Li, Fen, Yan, Hong
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Agricultural wastes
Aqueous solutions
Biotechnology
Catalysis
Chemistry
Chemistry and Materials Science
Cost analysis
Electronic
Fourier transforms
FTIR spectrometers
Industrial Chemistry/Chemical Engineering
Infrared spectrometers
Inorganic
Kinetics
Low cost
Materials (Organic
Materials Science
Methylene blue
Okara
Sodium dodecyl sulfate
Thin Films
화학공학
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Summary:Agricultural waste okara (OA) was selected as a precursor to prepare low-cost adsorbent for the removal of methylene blue (MB). Sodium dodecyl sulfate (SDS), as a kind of anionic surfactant, was loaded onto okara (SOA) to achieve high adsorption ability. Scanning electron microscopy, Fourier transform infrared spectrometer and X-ray diffraction were investigated for the materials characterization. The effect of pH, contact time, initial concentration, adsorbent dose and ionic strength was determined to explore the adsorption properties. The adsorption kinetics, adsorption isotherms, cost analysis of adsorbent and adsorption mechanism were discussed. And the adsorption equilibrium data fitted well with Langmuir model, while the calculated maximum adsorption capacity was 238.10 mg g −1 for OA and 334.83 mg g −1 for SOA, respectively. The kinetics data followed the pseudo-second-order model. Thermodynamic parameters (ΔH o , ΔG o and ΔS o ) indicated the spontaneous and exothermal nature. This research reveals that SOA is an effective, low-cost and promising adsorbent on the adsorption of MB on aqueous solution.
ISSN:0256-1115
1975-7220
DOI:10.1007/s11814-021-0880-7