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Article

Evaluation of Polyurea-Crosslinked Alginate Aerogels for Seawater Decontamination

1
Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece
2
Laboratory of Environmental Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15784 Athens, Greece
*
Authors to whom correspondence should be addressed.
Received: 1 February 2021 / Revised: 14 February 2021 / Accepted: 22 February 2021 / Published: 4 March 2021
(This article belongs to the Special Issue Aerogels 2020)
Polyurea-crosslinked Ca-alginate (X-Ca-alginate) aerogel beads (diameter: 3.3 mm) were evaluated as adsorbents of metal ions, organic solvents, and oils. They were prepared via reaction of an aromatic triisocyanate (Desmodur RE) with pre-formed Ca-alginate wet gels and consisted of 54% polyurea and 2% calcium. X-Ca-alginate aerogels are hydrophobic nanoporous materials (90% v/v porosity), with a high BET surface area (459 m2/g−1), and adsorb PbII not only from ultrapure water (29 mg/g−1) but also from seawater (13 mg/g−1) with high selectivity. The adsorption mechanism involves replacement of CaII by PbII ions coordinated to the carboxylate groups of the alginate backbone. After treatment with a Na2EDTA solution, the beads can be reused, without significant loss of activity for at least two times. X-Ca-alginate aerogels can also uptake organic solvents and oil from seawater; the volume of the adsorbate can be as high as the total pore volume of the aerogel (6.0 mL/g−1), and the absorption is complete within seconds. X-Ca alginate aerogels are suitable for the decontamination of aquatic environments from a broader range of inorganic and organic pollutants. View Full-Text
Keywords: alginate aerogels; environmental remediation; polymer-crosslinked aerogels; seawater; water decontamination alginate aerogels; environmental remediation; polymer-crosslinked aerogels; seawater; water decontamination
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MDPI and ACS Style

Paraskevopoulou, P.; Raptopoulos, G.; Leontaridou, F.; Papastergiou, M.; Sakellari, A.; Karavoltsos, S. Evaluation of Polyurea-Crosslinked Alginate Aerogels for Seawater Decontamination. Gels 2021, 7, 27. https://doi.org/10.3390/gels7010027

AMA Style

Paraskevopoulou P, Raptopoulos G, Leontaridou F, Papastergiou M, Sakellari A, Karavoltsos S. Evaluation of Polyurea-Crosslinked Alginate Aerogels for Seawater Decontamination. Gels. 2021; 7(1):27. https://doi.org/10.3390/gels7010027

Chicago/Turabian Style

Paraskevopoulou, Patrina, Grigorios Raptopoulos, Faidra Leontaridou, Maria Papastergiou, Aikaterini Sakellari, and Sotirios Karavoltsos. 2021. "Evaluation of Polyurea-Crosslinked Alginate Aerogels for Seawater Decontamination" Gels 7, no. 1: 27. https://doi.org/10.3390/gels7010027

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