Corncob as an effective, eco-friendly, and economic biosorbent for removing the azo dye Direct Yellow 27 from aqueous solutions

The corncob is an agricultural waste generated in huge quantities during corn processing. In this paper, we tested the capacity of corncob particles for water purification by removing the azo dye Direct Yellow 27 (DY27) via biosorption. The biosorption process was investigated in terms of the kineti...

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Bibliographic Details
Published in:PloS one 2018-04, Vol.13 (4), p.e0196428-e0196428
Main Authors: Berber-Villamar, Nayda Karina, Netzahuatl-Muñoz, Alma Rosa, Morales-Barrera, Liliana, Chávez-Camarillo, Griselda Ma, Flores-Ortiz, César Mateo, Cristiani-Urbina, Eliseo
Format: Article
Language:English
Subjects:
Adsorption
Agricultural economics
Agricultural pollution
Agricultural wastes
Aqueous solutions
Azo compounds
Azo dyes
Biology and Life Sciences
Biosorption
Cellulose
Chemical properties
Corn
Dyes
Earth Sciences
Environmental aspects
Fourier transforms
Kinetics
Laboratories
Laser microscopy
Lasers
Lignin
Lignocellulose
Mathematical models
Membrane separation
Microscopy
Oxidation
Physical Sciences
Proteins
Research and Analysis Methods
Spectroscopy
Wastewater
Wastewater pollution
Wastewater treatment
Water pollution
Water purification
Water treatment
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Summary:The corncob is an agricultural waste generated in huge quantities during corn processing. In this paper, we tested the capacity of corncob particles for water purification by removing the azo dye Direct Yellow 27 (DY27) via biosorption. The biosorption process was investigated in terms of the kinetics, equilibria, and thermodynamics. Batch biosorption studies showed that the biosorption performance has strong inverse correlations to the solution pH and the corncob particle size, and it increases quickly with increasing contact time and initial dye concentration. The pseudo-second-order kinetic model provides the best fit to the experimental data, whereas the Redlich-Peterson isotherm model is most suitable for describing the observed equilibrium biosorption. The biosorption process is exothermic, spontaneous, and physisorption in character. Fourier transform infrared (FTIR) spectroscopy and confocal scanning laser microscopy (CSLM) studies suggest that lignocellulose and proteins play key roles in the biosorption of DY27 from aqueous solutions by corncob. Furthermore, after biosorption onto the corncob, the dye can be effectively desorbed using 0.1 M NaOH solution. Therefore, the corncob can be used as a promising biosorbent to remediate DY27-contaminated water and wastewater.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0196428