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. 2018 Nov 15;23(11):2982.
doi: 10.3390/molecules23112982.

Adsorption of Cu(II) and Zn(II) Ions from Aqueous Solution by Gel/PVA-Modified Super-Paramagnetic Iron Oxide Nanoparticles

Anudari Dolgormaa  1 , Chang-Jiang Lv  2 , Yin Li  3 , Jian Yang  4 , Jun-Xing Yang  5 , Peng Chen  6 , Hong-Peng Wang  7 , Jun Huang  8
Affiliations

Adsorption of Cu(II) and Zn(II) Ions from Aqueous Solution by Gel/PVA-Modified Super-Paramagnetic Iron Oxide Nanoparticles

Anudari Dolgormaa et al. Molecules. .

Abstract

Super-paramagnetic iron oxide nanoparticles (SPIONs)/gelatin (gel)/polyvinyl alcohol (PVA) nanoparticles were designed and synthesized by the co-precipitation method and further modified with gel and PVA. These nanoparticles were used for the removal of Cu(II) and Zn(II) from aqueous solutions. The adsorbents were rich in different functional groups for chemisorption and showed effective adsorption properties. The adsorption of Cu(II) and Zn(II) on the SPIONs/gel and SPIONs/gel/PVA materials were investigated with respect to pH, adsorption kinetics, and adsorption isotherms. The adsorption data was fitted to the Langmuir, Freundlich, and Sips models at the optimum pH 5.2 (±0.2) over 60 min; SPIONs/gel showed maximum adsorption capacities of 47.594 mg/g and 40.559 mg/g for Cu(II) and Zn(II); SPIONs/gel/PVA showed those of 56.051 mg/g and 40.865 mg/g, respectively. The experimental data fitted the pseudo-second-order model, indicating that the process followed chemical monolayer adsorption. In addition, the SPIONs/gel/PVA showed better stability and Cu(II) adsorption efficiency than SPIONs/gel.

Keywords: PVA; adsorption; gelatin; heavy metal; super-paramagnetic iron oxide nanoparticles.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The FTIR spectra of (a) poly vinyl acetate (PVA), gelatin (gel), (b) Super-paramagnetic iron oxide nanoparticles (SPIONs), SPIONs/gel and SPIONs/gel/PVA.
Figure 2
Figure 2
The TEM images and Dynamic Light Scattering (DLS) of (a) SPIONs, (b) SPIONs/gel, and (c) SPIONs/gel/PVA.
Figure 2
Figure 2
The TEM images and Dynamic Light Scattering (DLS) of (a) SPIONs, (b) SPIONs/gel, and (c) SPIONs/gel/PVA.
Figure 3
Figure 3
XRD spectra of SPIONs, SPIONs/gel and SPIONs/gel/PVA.
Figure 4
Figure 4
Magnetization curve of SPIONs/gel and SPIONs/gel/PVA; the magnetization responds to the external magnetic field of magnetic adsorbents.
Figure 5
Figure 5
Thermographs of SPIONs, SPIONs/gel and SPIONs/gel/PVA.
Figure 6
Figure 6
Effect of pH on Cu(II) (a) and Zn(II) (b) ions adsorption by SPIONs/gel and SPIONs/gel/PVA.
Figure 7
Figure 7
Adsorption kinetics for the adsorption of Cu(II) (a) and Zn(II) (b) by SPIONs/gel and SPIONs/gel/PVA.
Figure 8
Figure 8
Equilibrium adsorption isotherm of Cu(II) (a) and Zn(II) (b) by the SPIONs/gel and SPIONs/gel/PVA.
Figure 9
Figure 9
Regeneration of SPIONs/gel and SPIONs/gel/PVA for Cu(II) (a) and Zn(II) (b).
See this image and copyright information in PMC

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