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. 2023 Apr 18;39(15):5294-5305.
doi: 10.1021/acs.langmuir.2c03265. Epub 2023 Apr 6.

Carboxymethylcellulose/Hydrotalcite Bionanocomposites as Paraben Sorbents

Daniel Cosano  1 , Dolores Esquivel  1 , Francisco J Romero-Salguero  1 , César Jiménez-Sanchidrián  1 , José Rafael Ruiz  1
Affiliations

Carboxymethylcellulose/Hydrotalcite Bionanocomposites as Paraben Sorbents

Daniel Cosano et al. Langmuir. .

Abstract

In this work, we synthesized several bionanocomposites of hydrotalcites containing carboxymethylcellulose as interlayer anion (HT-CMC) to be used as sorbents for parabens, a family of emergent pollutants (specifically, for 4-methyl-, 4-propyl- and 4-benzylparaben). Bionanocomposites were obtained by ultrasound-assisted coprecipitation and characterized by X-ray diffraction analysis, fourier transform infrared and raman spectroscopies, elemental and thermogravimetric analysis, scanning and transmission electron microscopies and X-ray fluorescence. All materials proved to be efficient sorbents for parabens through a process conforming to a pseudo second-order kinetics. The experimental adsorption data fitted the Freundlich model very closely and were also highly correlated with the Temkin model. The effects of pH, adsorbate concentration, amount of sorbent and temperature on the adsorption process was evaluated, obtaining the best results for methylparaben adsorption at pH 7, 25 mg of adsorbent and 348 K. The sorbent, HT-CMC-3, showed the highest adsorption capacity (>70%) for methylparaben. Furthermore, a reusability study showed that the bionanocomposite is reusable after its regeneration with methanol. The sorbent still retained its adsorption capacity for up to 5 times with a little loss of efficiency (<5%).

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
XRD patterns for the hydrotalcites. (a) HT-NIT, (b) HT-CMC-1, (c) HT-CMC-2, (d) HT-CMC-3 and (e) HT-CMC-4.
Figure 2
Figure 2
Raman spectra for the hydrotalcites: (a) HT-NIT, (b) HT-CMC-1, (c) HT-CMC-2, (d) HT-CMC-3, (e) HT-CMC-4. (f) Spectrum for sodium carboxymethylcellulose.
Figure 3
Figure 3
FT-IR spectra for the hydrotalcites: (a) HT-NIT, (b) HT-CMC-1, (c) HT-CMC-2, (d) HT-CMC-3, (e) HT-CMC-4. (f) Spectrum for sodium carboxymethylcellulose.
Figure 4
Figure 4
Thermogravimetric curves for the hydrotalcites and sodium carboxymethylcellulose.
Figure 5
Figure 5
Adsorption of 4-methylparaben (a), 4-propylparaben (b), and 4-benzylparaben (c) onto various hydrotalcites bionanocomposites.
Figure 6
Figure 6
Kinetics of the adsorption process. (a) Pseudo first-order model. (b) Pseudo second-order model, (c) Elovich model, and (d) intraparticle diffusion model.
Figure 7
Figure 7
Influence of the initial concentration of 4-methylparaben on its adsorption onto HT-CMC-3. Experimental conditions: 50 mL of adsorbate solution, 200 mg of sorbent, and 22 °C.
Figure 8
Figure 8
Influence of the amount of HT-CMC-3 on the adsorption of 4-methylparaben.
Figure 9
Figure 9
Variation of ln k2 with the reciprocal temperature.
Figure 10
Figure 10
Langmuir (a), Freundlich (b), and Temkin plot (c) for 4-methylparaben adsorption.
Scheme 1
Scheme 1. Hydrophobic Interaction between Methylparaben and Interlaced Cellulose in Hydrotalcite
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