New highly-percolating alginate-PEI membranes for efficient recovery of chromium from aqueous solutions

[Display omitted] •Macroporous membrane obtained by controlled alginate/polyethyleneimine interaction.•Dual crosslinking alginate/calcium and PEI/glutaraldehyde for structured foam.•Highly percolating, stable foam with outstanding properties for chromate binding.•Sips equation for modeling chromate...

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Bibliographic Details
Published in:Carbohydrate polymers 2019-12, Vol.225, p.115177, Article 115177
Main Authors: Mo, Yayuan, Wang, Shengye, Vincent, Thierry, Desbrieres, Jacques, Faur, Catherine, Guibal, Eric
Format: Article
Language:English
Subjects:
Alginate
Analytical chemistry
Chemical Sciences
Hexavalent chromium
Macroporous membranes
Material chemistry
or physical chemistry
Polyethyleneimine
Polymers
Sorption isotherms
Theoretical and
Uptake kinetics
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Summary:[Display omitted] •Macroporous membrane obtained by controlled alginate/polyethyleneimine interaction.•Dual crosslinking alginate/calcium and PEI/glutaraldehyde for structured foam.•Highly percolating, stable foam with outstanding properties for chromate binding.•Sips equation for modeling chromate sorption.•Uptake kinetics controlled by pseudo-second order rate equation. Highly percolating membranes are prepared by the interaction of polyethylenimine and alginate (with glutaraldehyde crosslinking). SEM illustrates the macroporous structure of the material. The material is characterized by FTIR before and after chromate anions sorption. Batch-simulated continuous sorption experiments revealed that the maximum sorption occurred at pH 2 and the flow rate has limited effect on sorption efficiency. Uptake kinetics and sorption isotherms are well fitted by the pseudo-second-order rate and Sips equations, respectively. Maximum sorption is found close to 314 mg g−1. Competition effects from Ca(II), Cu(II), Cl−, NO3−, and SO42− are investigated to evaluate sorbent selectivity. The membranes are applied to remediate a simulate of Cr(VI) contaminated electroplating wastewater. Successive cycles of sorption and desorption show that the membranes maintain sorption capacity higher than 200 mg Cr g−1 for both Cr(VI) and total chromium for the first two cycles. These new highly percolating membranes have promising performances for Cr(VI) removal.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2019.115177