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    Cellulose-Cyclodextrin Co-Polymer for the Removal of Cyanotoxins on Water Sources

    Year: 2019

    Journal: Polymers, Volume 11, DEC

    Authors: Gomez-Maldonado, Diego; Erramuspe, Iris Beatriz Vega; Filpponen, Ilari; Johansson, Leena-Sisko; Lombardo, Salvatore; Zhu, Junyong; Thielemans, Wim; Peresin, Maria S.

    Keywords: bio-based composite; cellulose nanofibrils; beta-cyclodextrin; surface chemistry; water treatment; cyanotoxins; microcystin-LR

    With increasing global water temperatures and nutrient runoff in recent decades, the blooming season of algae lasts longer, resulting in toxin concentrations that exceed safe limits for human consumption and for recreational use. From the different toxins, microcystin-LR has been reported as the main cyanotoxin related to liver cancer, and consequently its abundance in water is constantly monitored. In this work, we report a methodology for decorating cellulose nanofibrils with beta-cyclodextrin or with poly(beta-cyclodextrin) which were tested for the recovery of microcystin from synthetic water. The adsorption was followed by Quartz Crystal Microbalance with Dissipation monitoring (QCM-D), allowing for real-time monitoring of the adsorption behavior. A maximum recovery of 196 mg/g was obtained with the modified by cyclodextrin. Characterization of the modified substrate was confirmed with Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Photoelectron Spectroscopy (XPS), Thermogravimetric Analysis (TGA), and Atomic Force Microscopy (AFM).
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