RT info:eu-repo/semantics/article
T1 Graphene quantum dot-based hydrogels for photocatalytic degradation of organic dyes
A1 Ibarbia, Antton
A1 Sánchez-Abella, Laura
A1 Lezama, Luis
A1 Grande, Hans J.
A1 Ruiz Fernández, Virginia
K1 Graphene quantum dot
K1 Hydrogel
K1 Photocatalysis
K1 Dye photodegradation
K1 Peroxidase activity
K1 Nanozyme
K1 Química analítica
K1 Chemistry, Analytic
K1 Ciencia de materiales
K1 Materials science
AB Graphene oxide quantum dots (GOQD) covalently immobilized in hydrogels have shown great promise as artificial enzymes for the photodegradation of the organic dye rhodamine B (RhB). Suitably functionalized with cross-linkable 3-(triethoxysilyl)propyl methacrylate (MPS) units, GOQD-MPS were incorporated by free radical copolymerization into poly[2-(Methacryloyloxy)ethyl]trimethylammonium]-co-(3-Sulfopropylmethacrylate) 50:50 (A50coS50) hydrogels with known antiadhesive properties. The peroxidase mimetic activity of GOQD solutions for the oxidation of chromogenic peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in presence of hydrogen peroxide increased significantly upon functionalization with MPS. Consequently, composite GOQD-A50coS50 hydrogels also exhibited high peroxidase activity for TMB oxidation. Moreover, GOQD-MPS solutions and GOQD-A50coS50 hydrogels showed remarkable catalytic activity for degradation of model RhB dye in darkness, an activity that was notably enhanced by visible light irradiation. The photoactivity depended on GOQD-MPS loading and hydrogel volume. Interestingly, GOQD-A50coS50 hydrogels retained the high photocatalytic activity after several months stored wet as well as after undergoing drying-rehydration processes, key from a practical point of view for applications in water treatment. The activity of rehydrated hydrogels for RhB photodegradation was only reduced by 15% compared to the activity of a non-dried hydrogel under the same test conditions.
PB Elsevier
SN 0169-4332
YR 2020
FD 2020-10
LK https://hdl.handle.net/10259/11064
UL https://hdl.handle.net/10259/11064
LA eng
NO Financial support from the Basque Government under the ELKARTEK program (ACTIMAT project, grant KK-2018/00099) is gratefully acknowledged. The authors wish to thank Prof. Andrey Chuvilin from CIC nanoGUNE (Donostia-San Sebastián, Spain) for TEM characterization of hydrogels and Eider Beguiristain (CIDETEC) for help with hydrogel characterization.
DS Repositorio Institucional de la Universidad de Burgos
RD 22-abr-2026