Soybean hulls as a low‐cost biosorbent for removal of methylene blue contaminant

Methylene blue is a cationic dye used for dyeing cotton, wool, and silk. This dye can cause impacts when reaching water resources due to the reduction of sunlight infiltration, besides the health problems if ingested. Therefore, the complete removal of this contaminant in industrial effluents is ind...

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Bibliographic Details
Published in:Environmental progress 2020-03, Vol.39 (2), p.n/a
Main Authors: Cusioli, Luís Fernando, Quesada, Heloise B., Baptista, Aline T. A., Gomes, Raquel G., Bergamasco, Rosângela
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Agricultural economics
Agricultural production
Agricultural wastes
Animal feed
biosorption
Cationic dyes
Chemical analysis
Contaminants
Cotton
Dyeing
Dyes
Feeds
Functional groups
Health problems
Heterogeneity
Hulls
Industrial effluents
Industrial pollution
Industrial wastewater
Landfills
Methylene blue
Oils & fats
pH effects
Pollutant removal
Porosity
Silk
soybean hulls
Soybean oil
Soybeans
Supplements
Surface charge
Waste disposal sites
Wastewater treatment
Water resources
Wool
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Summary:Methylene blue is a cationic dye used for dyeing cotton, wool, and silk. This dye can cause impacts when reaching water resources due to the reduction of sunlight infiltration, besides the health problems if ingested. Therefore, the complete removal of this contaminant in industrial effluents is indispensable. Currently, soybean hulls residues are used in animal feed supplementation; however, since soybean oil production is large, expressive quantities is discarded in landfills. Thus, the present study aim is to evaluate the adsorption capacity of methylene blue onto soybean hulls as an alternative use of this agroindustrial residue. The material was characterized through morphological and chemical analysis which showed porosity, heterogeneity, and functional groups that favor the adsorption. Due to the mainly negative charge of the surface, the pH did not affect the cationic dye uptake, enabling a wide pH range. After the adsorption studies, the best experimental conditions were at temperatures of 298 K, mass of 0.025 g, and contact time of 180 min, resulting in the maximum adsorption capacity of 169.90 mg g−1. When compared with other low‐cost biosorbent and activated carbons, it can be perceived a potential applicability of soybean hulls in wastewater treatment as an alternative use.
ISSN:1944-7442
1944-7450
DOI:10.1002/ep.13328