Journal
CHEMOSPHERE
Volume 300, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.134583
Keywords
Nanocomposites; Cyanobacteria; Biopolymers; Intermolecular interactions; Cyanotoxins
Categories
Funding
- Aquatic Nuisance Species Research Program (ANSRP) 6.3 Military Engineering [PE 0603119A]
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This study evaluated the interactions of chitosan/graphene composites with different species of cyanobacteria and their impact on water quality. The results showed that the composites were effective in removing algal density and toxins, especially the MC toxins produced by Microcystis aeruginosa.
Water quality can be severely impacted by algal blooms alone, yet cyanotoxins, such as microcystin (MC), are potent underlying hazards produced by various species of cyanobacteria. Currently there is a need for environmentally compatible and economically viable media to address large scale application for HAB impacted waters. This study evaluated the interactions of chitosan/graphene (CSG) composites with three different species of cyanobacteria: Anabaena sp, Synechocystis sp, and Microcystis aeruginosa for both removal of algal optical density and toxins. Although results suggest that CSG has an algae dependent removal of density with a range of 40-90% removal, graphene/CSG is highly effective at MC toxin removal, removing >94% of MC-LR produced by Microcystis aeruginosa. Characterization by SEM and XRD revealed that 750 m2/g surface area graphene, imparts graphene morphology and functionality into the chitosan matrix surface, potentially enabling pi-pi interactions between graphene and the aromatic ring of microcystin. This proposed pi-pi removal mechanism of microcystin via the CSG chitosan biopolymer substrate offers a promising sustainable and selective media suitable for deployable treatment of HAB impacted waters.
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