Graphene-Mediated removal of Microcystin-LR in chitosan/graphene composites for treatment of harmful algal blooms

被引：10
作者：
Zetterholm, Sarah Grace [1 ]
Gurtowski, Luke [1 ]
Roberts, Jesse L. [1 ]
McLeod, Sheila [1 ]
Fernando, Brianna M. [1 ]
Griggs, Chris S. [1 ]
机构：
[1] US Army Engineer Res & Dev Ctr ERDC, 3909 Halls Ferry Rd, Vicksburg, MS 39180 USA
来源：
CHEMOSPHERE | 2022年 / 300卷
关键词：
Nanocomposites; Cyanobacteria; Biopolymers; Intermolecular interactions; Cyanotoxins; OXIDE; ADSORPTION;
D O I：
10.1016/j.chemosphere.2022.134583
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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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页数：8
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