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Alginate-Based Hydrogel Beads as a Biocompatible and Efficient Adsorbent for Dye Removal from Aqueous Solutions - PubMed

  • ️Mon Jan 01 2018

Alginate-Based Hydrogel Beads as a Biocompatible and Efficient Adsorbent for Dye Removal from Aqueous Solutions

Safoura Asadi et al. ACS Omega. 2018.

Abstract

In this study, sodium alginate was employed as a starting material for preparing two kinds of biocompatible adsorbents, including calcium alginate hydrogel beads and magnetic hydrogel beads. Fourier transform infrared spectroscopy, X-ray diffraction pattern, and scanning electron microscopy/energy-dispersive X-ray techniques were used to characterize the prepared adsorbents. The performance of the prepared adsorbents for the removal of methyl violet from aqueous solution was studied in detail. Both kinetics and equilibrium aspects of methyl violet adsorption were investigated, and the obtained equilibrium and kinetics data were described with various adsorption models. The effects of initial dye concentration, adsorbent dosage, and temperature on adsorption performance were investigated. Thermodynamic parameters of adsorption were obtained as well.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1

Chemical structure of sodium alginate.

Figure 2
Figure 2

SEM images of the synthesized iron oxide with increasing magnification from (a–d).

Figure 3
Figure 3

SEM images of dried magnetic beads with (a) low and (b) high magnifications.

Figure 4
Figure 4

XRD pattern of dried magnetic beads.

Figure 5
Figure 5

FTIR spectra of: (a) calcium alginate hydrogel beads, (b) MV-loaded calcium alginate hydrogel beads, (c) magnetic hydrogel beads, and (d) MV-loaded magnetic hydrogel beads.

Figure 6
Figure 6

Experimental kinetics data for the adsorption of MV by (a) calcium alginate hydrogel beads and (b) magnetic hydrogel beads at different initial concentrations of MV. The solid lines show the predicted values by the best fitted model.

Figure 7
Figure 7

Coincidence of curves for n-values of (a) n = 0.8 for calcium alginate hydrogel beads and (b) n = 0.5 for magnetic hydrogel beads.

Figure 8
Figure 8

Linear plot of extended pseudo-second-order for the adsorption of MV onto (a) different dosages of calcium alginate hydrogel beads and (b) different dosages of magnetic hydrogel beads.

Figure 9
Figure 9

Adsorption rate constants derived from (a,c) extended pseudo-second order and (b,d) pseudo-second order for adsorption of MV on (a,b) calcium alginate hydrogel beads and (c,d) magnetic hydrogel beads.

Figure 10
Figure 10

Adsorption isotherm of MV by (a) calcium alginate hydrogel beads and (b) magnetic hydrogel beads. The experimental data are shown with symbols, whereas the solid lines are the predicted values the by ML–F isotherm.

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