Modified dry bean pod waste (Phaseolus vulgaris) as a biosorbent for fluorescein removal from aqueous media: Batch and fixed bed studies

This study presents the use of dry bean pods as a solid phase for fluorescein removal from water. The non-pretreated solid phase did not display any sorption properties for the chosen dye. However, interesting sorption properties were observed following a chemical derivative treatment with nitric ac...

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Bibliographic Details
Published in:Journal of hazardous materials 2022-02, Vol.424 (Pt D), p.127723-127723, Article 127723
Main Authors: De Sá, Igor C., Oliveira Silva, P.M., Nossol, E., Borges, P.H.S., Lepri, Fábio G., Semaan, F.S., Dornellas, R.M., Pacheco, W.F.
Format: Article
Language:English
Subjects:
Adsorption
chemical derivative
dry bean pod
Fluorescein
Hydrogen-Ion Concentration
Kinetics
Phaseolus
sorption
Thermodynamics
wastewater treatment
Water
Water Pollutants, Chemical - analysis
Water Purification
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Summary:This study presents the use of dry bean pods as a solid phase for fluorescein removal from water. The non-pretreated solid phase did not display any sorption properties for the chosen dye. However, interesting sorption properties were observed following a chemical derivative treatment with nitric acid. The study was carried out using both batch and column approaches. Regarding the batch study, all parameters that influence sorption capacity, such, as pH, adsorbent mass, ionic strength, temperature and contact time, were evaluated. A sorptive capacity of 36.80 mg g−1 was obtained in the optimized condition. In the fixed column bed study, the influence of particle size, flow rate and initial concentration of the dye were evaluated through breakthrough curves and a sorptive capacity of 4.35 mg g−1 was obtained. Thermodynamic studies revealed that the adsorption is exothermic and spontaneous. Four different models, Langmuir, Freundlich, Temkin and Redlich-Patterson, were employed. The Akaike information criterion (AIC) was employed to rank the best equilibrium model, which was determined as the Freundlich isotherm. The method was applied to a real sample and the same removal rate was obtained, thus indicating its suitability to wastewater treatment. [Display omitted] •Modified DBP was applied for the removal of Fluorescein employing batch and column approaches.•A remarkable enhancement of the sorptive capacity due the acid pretreatment.•Biosorption mechanism is mostly due to electrostatic, π- π and hydrogen interactions.•Column studies demonstrated the feasibility of A-DBP for FSC removal from environmental samples.•Highest sorption capacity (37.81 mg g-1) for FSC among biosorbents reported in previous studies.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2021.127723