Adsorption of reactive blue BF-5G dye by soybean hulls: kinetics, equilibrium and influencing factors

The textile industry is known for the high use of chemicals, such as dyes, and large volumes of effluent that contaminate waters, a fact that has encouraged research and improved treatment techniques. In this study, we used unprocessed soybean hulls for the removal of reactive blue BF-5G dye. The po...

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Bibliographic Details
Published in:Water science and technology 2016-03, Vol.73 (5), p.1166-1174
Main Authors: Honorio, Jacqueline Ferandin, Veit, Márcia Teresinha, Gonçalves, Gilberto da Cunha, de Campos, Élvio Antonio, Fagundes-Klen, Márcia Regina
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Agitation
Aqueous solutions
Boundary layers
Capacity
Color removal
Coloring Agents - chemistry
Contamination
Dosage
Duration
Dyes
Glycine max - chemistry
Hulls
Hydrogen-Ion Concentration
Industrial Waste - analysis
Isotherms
Kinetics
Mass transfer
Reaction kinetics
Removal
Soybeans
Spectrum analysis
Temperature
Textile Industry
Triazines - chemistry
Water - chemistry
Water Pollutants, Chemical - chemistry
Water Purification - methods
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Summary:The textile industry is known for the high use of chemicals, such as dyes, and large volumes of effluent that contaminate waters, a fact that has encouraged research and improved treatment techniques. In this study, we used unprocessed soybean hulls for the removal of reactive blue BF-5G dye. The point of zero charge of soybean hulls was 6.76. Regarding the speed of agitation in the adsorption process, the resistance to mass transfer that occurs in the boundary layer was eliminated at 100 rpm. Kinetics showed an experimental amount of dye adsorbed at equilibrium of 57.473 mg g(-1) obtained under the following conditions: dye initial concentration = 400 mg L(-1); diameter of particle = 0.725 mm; dosage = 6 g L(-1); pH 2; 100 rpm; temperature = 30 °C; and duration of 24 hours. The pseudo-second order best showed the dye removal kinetics. The adsorption isotherms performed at different temperatures (20, 30, 40 and 50 °C) showed little variation in the concentration range assessed, being properly adjusted by the Langmuir isotherm model. The maximum capacity of dye adsorption was 72.427 mg g(-1) at 30 °C. Since soybean hull is a low-cost industrial byproduct, it proved to be a potential adsorbent for the removal of the textile dye assessed.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2015.589