Journal
ACS NANO
Volume 12, Issue 8, Pages 8160-8168Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b03202
Keywords
nanoparticles; cellulose nanocrystals; graphene quantum dots; heavy metal scavenging; hydrogel
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Funding
- NSERC Canada
- NSERC Vanier Canada Graduate Scholarship
- Alexander von Humboldt Foundation
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We report a nanocolloidal hydrogel that combines the advantages of molecular hydrogels and nanoparticle-based scavengers of heavy metal ions. The hydrogel was formed by the chemical cross-linking of cellulose nanocrystals and graphene quantum dots. Over a range of hydrogel compositions, its structure was changed from lamellar to nanofibrillar, thus enabling the control of hydrogel permeability. Using a microfluidic approach, we generated nanocolloidal microgels and explored their scavenging capacity for Hg2+, Cu2+, Ni2+, and Ag+ ions. Due to the large surface area and abundance of ion-coordinating sites on the surface of nanoparticle building blocks, the microgels exhibited a high ion-sequestration capacity. The microgels were recyclable and were used in several ion scavenging cycles. These features, in addition to the sustainable nature of the nanoparticles, make this nanocolloidal hydrogel a promising ion-scavenging material.
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