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. 2022 Dec 10;8(12):810.
doi: 10.3390/gels8120810.

Preparation and Superstrong Adsorption of a Novel La(Ⅲ)-Crosslinked Alginate/Modified Diatomite Macroparticle Composite for Anionic Dyes Removal from Aqueous Solutions

Yuting Zhao  1   2 , Beigang Li  1   2
Affiliations

Preparation and Superstrong Adsorption of a Novel La(Ⅲ)-Crosslinked Alginate/Modified Diatomite Macroparticle Composite for Anionic Dyes Removal from Aqueous Solutions

Yuting Zhao et al. Gels. .

Abstract

In order to solve the problem of dye pollution of the water environment, a green macroparticle composite (CPAM-Dia/SA-La) as a bioadsorbent was prepared through a sodium alginate (SA) reaction with a polyacrylamide (CPAM)-modified diatomite (Dia) and further La(III) ion crosslinking polymerization, and characterized by various analytical methods. The important preparation and adsorption conditions of the composite were explored by the adsorption of Acid blue 113 (AB 113) and Congo red (CR) dyes. The dye adsorption efficiency was evaluated. The results show that CPAM-Dia/SA-La composite prepared under the optimized conditions displays superstrong adsorption capacities of 2907 and 1578 mg/g for AB 113 and CR and almost 100% removal efficiency within 60 min adsorption time at pH 2.0 and 298 K, and they decrease slightly with the pH increase to 10. The fitting of equilibrium data to the Langmuir model is the best and the adsorption kinetic processes can be expressed by the Pseudo-second-order kinetic model. The adsorption processes are both spontaneous and exothermic. The analysis results of FT-IR and XPS revealed that the superstrong adsorption of CPAM-Dia/SA-La for dyes. The composite adsorbed by the dye can be recycled. CPAM-Dia/SA-La is a promising biosorbent for dye wastewater treatment.

Keywords: CPAM; La(III) ions; adsorption; diatomite; sodium alginate.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Effect of the concentration of CPAM (a), SA (b), CPAM-Dia (c) and La(Ⅲ) (d) on the adsorption property of the gel spheres (2000 mg/L Dye solution 25 mL).
Figure 2
Figure 2
SEM images of SA (a), Dia (b) and gel spheres (c,d); XRD (e), FT−IR (f) and UV−Vis (g) spectra; EDS results of raw materials and gel spheres (h); Element distribution of the gel composite (i–m).
Figure 3
Figure 3
Effect of gel sphere dosage (a), pH (b), contact time and temperature on adsorption (c,d); isothermal adsorption curves (e,f).
Figure 4
Figure 4
Comparison of adsorption properties of different materials (a); Effect of regeneration cycle times on regeneration rate (b).
Figure 5
Figure 5
FT−IR (a) and UV−Vis (b) spectra of CPAM-Dia/SA-La before and after dye adsorption.
Figure 6
Figure 6
XPS spectra of the gel composite before and after dye adsorption (a–d).
Figure 7
Figure 7
Interaction sketch between the gel composite and anionic dyes.
Figure 8
Figure 8
Molecular Structures of AB 113 and CR dyes.
See this image and copyright information in PMC

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