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. 2020 Aug 10;12(8):1792.
doi: 10.3390/polym12081792.

Biopolymeric Membrane Enriched with Chitosan and Silver for Metallic Ions Removal

Simona Căprărescu  1 , Roxana Gabriela Zgârian  2 , Graţiela Teodora Tihan  2 , Violeta Purcar  3 , Eugenia Eftimie Totu  4 , Cristina Modrogan  4 , Anita-Laura Chiriac  3 , Cristian Andi Nicolae  3
Affiliations

Biopolymeric Membrane Enriched with Chitosan and Silver for Metallic Ions Removal

Simona Căprărescu et al. Polymers (Basel). .

Abstract

The present paper synthesized, characterized, and evaluated the performance of the novel biopolymeric membrane enriched with cellulose acetate and chitosan (CHI)-silver (Ag) ions in order to remove iron ion from the synthetic wastewater using a new electrodialysis system. The prepared membranes were characterized by Fourier Transforms Infrared Spectroscopy-Attenuated Total Reflection (FTIR-ATR), Thermal Gravimetric Analysis (TGA) and Differential Thermal Analysis (DSC), contact angle measurements, microscopy studies, and electrochemical impedance spectroscopy (EIS). The electrodialysis experiments were performed at the different applied voltages (5, 10, and 15 V) for one hour, at room temperature. The treatment rate (TE) of iron ions, current efficiency (IE), and energy consumption (Wc) were calculated. FTIR-ATR spectra evidenced that incorporation of CHI-Ag ions into the polymer mixture led to a polymer-metal ion complex formation within the membrane. The TGA-DSC analysis for the obtained biopolymeric membranes showed excellent thermal stability (>350 °C). The contact angle measurements demonstrated the hydrophobic character of the polymeric membrane and a decrease of it by CHI-Ag adding. The EIS results indicated that the silver ions induced a higher ionic electrical conductivity. The highest value of the iron ions treatment rate (>60%) was obtained for the biopolymeric membrane with CHI-Ag ions at applied voltage of 15 V.

Keywords: biopolymers; chitosan; electrodialysis; iron ions; membrane; silver ions.

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Conflict of interest statement

The authors declare no conflicts of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

Figures

Figure 1
Figure 1
Schematic illustration mechanisms for the obtaining of the biopolymeric membrane for removal of metal ions by electrodialysis process.
Figure 2
Figure 2
Scheme of the used impedance cell with four electrodes. WE—working electrode; WR—reference electrode associated with the WE; CE—counter electrode; CR—reference electrode associated with the CE; Imeasured is the measured current; Vmeasured is the measured potential; Vapplied is the applied potential.
Figure 3
Figure 3
Schematic representation of the electrodialysis system.
Figure 4
Figure 4
FTIR-ATR spectra of prepared membranes: CA/PEG (A) and CA/PEG/CHI-Ag (B).
Figure 5
Figure 5
TGA-DSC curves of prepared membranes: CA/PEG (A) and CA/PEG/CHI-Ag (B).
Figure 6
Figure 6
Optical microscope images for the surface morphology of prepared membranes: CA/PEG (A) and CA/PEG/CHI-Ag (B).
Figure 7
Figure 7
SEM images of prepared membranes: CA/PEG, top (A-a); CA/PEG, section (A-b); CA/PEG/CHI-Ag, top (B-a); CA/PEG/CHI-Ag, section (B-b).
Figure 8
Figure 8
Bode diagrams for CA/PEG membrane (A) and CA/PEG/CHI-Ag membrane (B).
Figure 9
Figure 9
Nyquist diagrams for CA/PEG membrane (A) and CA/PEG/CHI-Ag membrane (B).
Figure 10
Figure 10
The equivalent circuits for CA/PEG membrane (A) and CA/PEG/CHI-Ag membrane (B).
See this image and copyright information in PMC

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