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. 2023 Apr 3;13(1):5403.
doi: 10.1038/s41598-023-32532-5.

Intensification of strontium (II) ion biosorption on Sargassum sp via response surface methodology

F Soleymani  1 , M H Khani  2 , H Pahlevanzadeh  1 , Younes Amini  3
Affiliations

Intensification of strontium (II) ion biosorption on Sargassum sp via response surface methodology

F Soleymani et al. Sci Rep. .

Abstract

A batch system was employed to investigate the biosorption of strontium (II) on Sargassum sp. The biosorption of strontium on Sargassum sp was studied with response surface methodology to determine the combined effect of temperature, initial metal ion concentration, biomass treatment, biosorbent dosage and pH. Under optimal conditions, the algae's biosorption capacity for strontium (initial pH 7.2, initial strontium concentration 300 mg/l for Mg-treated biomass and biosorbent dosage 0.1 g in 100 mL metal solution) was measured at 103.95 mg/g. In our analysis, equilibrium data were fitted to Langmuir and Freundlich isotherms. Results show that the best fit is provided by the Freundlich model. Biosorption dynamics analysis of the experimental data indicated that strontium (II) was absorbed into algal biomass in accordance with the pseudo-second-order kinetics model well.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Scatter graph of the predicted response values versus the actual response values for the biosorption capacity of biomass for strontium.
Figure 2
Figure 2
Normal plot of studentized residuals versus normal % probability for bearing the experiment for strontium ions.
Figure 3
Figure 3
Interaction plot showing the effect of type of biomass and initial strontium (II) concentration on the strontium uptake of biomass holding other variables at their central values.
Figure 4
Figure 4
Element mapping of the surface of sargassum sp. earlier (a) and later (b) Sr2+ sorption at optimal conditions.
Figure 5
Figure 5
EDX analysis of sargassum sp. before (a) and after (b) Mg treatment, and after (c) strontium (II) sorption. Au peak comes from sample coating.
Figure 6
Figure 6
Two-factor interaction plot for biosorption capacity showing effects of biomass dose and type of biomass on the biosorption capacity for Mg-treated biomass holding other variables at their central values.
Figure 7
Figure 7
Three-dimensional plots presentation of the effects of pH and temperature (AD) on the strontium uptake of Mg-treated biomass holding other variables at their central values.
Figure 8
Figure 8
Perturbation plot for strontium (II) biosorption on Mg-treated sargassum sp.
Figure 9
Figure 9
The linearized PSO biosorption dynamics of strontium.
See this image and copyright information in PMC

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