The biosorption of Alizarin Red S by Spirulina platensis; process modelling, optimisation, kinetic and isotherm studies

Spirulina platensis is abundant biomass of cyanobacteria (blue-green algae) which is applied in the current study as a biosorbent. A statistical Box-Behnken approach was adopted to remove the toxic dye of alizarin red S (ARS) from synthetic solutions. A polynomial equation was developed to predict t...

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Bibliographic Details
Published in:International journal of environmental analytical chemistry 2023-02, Vol.103 (3), p.633-647
Main Authors: Nasoudari, Elaheh, Ameri, Maryam, Shams, Mahmoud, Ghavami, Vahid, Bonyadi, Ziaeddin
Format: Article
Language:English
Subjects:
Adsorptivity
Algae
Alizarin
Alizarin Red S
Aquatic plants
Biosorption
box-Behnken design
Color removal
Cyanobacteria
Dyes
Isotherms
Kinetics
Linear equations
optimisation
Optimization
Polynomials
Reaction time
Removal
Spirulina platensis
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Summary:Spirulina platensis is abundant biomass of cyanobacteria (blue-green algae) which is applied in the current study as a biosorbent. A statistical Box-Behnken approach was adopted to remove the toxic dye of alizarin red S (ARS) from synthetic solutions. A polynomial equation was developed to predict the dye removal efficiency and elucidate the interaction effects of variables. The maximum removal efficiency of ARS (69.1%) was obtained at pH 6.5, mixing time of 42.5 min, dye concentration of 100 mg. L −1 and S. platensis dose of 1.5 g. L −1 . The findings indicated that the biosorption rate of ARS had a direct relationship with the ARS concentration, pH, reaction time, and S. platensis dose. The quadratic model suggested that the ARS concentration is the major variable in ARS removal. The isotherms and kinetics data could be suitably reflected by the Langmuir model and the pseudo-first-order equation. The maximum adsorption capacity of S. cerevisiae was obtained to be 17.15 mg. g −1 based on the Langmuir model. The results showed that the removal rates of ARS from the first cycle up to the fourth cycle were varied from 55% to 20%, respectively. In conclusion, S. platensis shows suitable adsorptive characteristics and hence could be suggested as a viable option for future studies.
ISSN:0306-7319
1029-0397
DOI:10.1080/03067319.2020.1862814