2026-04-29T17:05:57Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/110642025-11-15T01:05:32Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

Ibarbia, Antton 76d5a3e4-5cc2-441c-ab20-0c9131422101 500 Sánchez-Abella, Laura f507ae40-c568-44aa-b645-59bf622c0c4b 500 Lezama, Luis 9b1ac1a2-e0b6-4d1f-afe9-c7c94f068da9 600 Grande, Hans J. c8ff9d1e-6b7b-4b80-ac09-068a3faaa23f 600 Ruiz Fernández, Virginia 858 600 0000-0002-0466-0634 2025-11-14T13:23:00Z 2025-11-14T13:23:00Z 2020-10 0169-4332 https://hdl.handle.net/10259/11064 10.1016/j.apsusc.2020.146937 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. 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. application/pdf eng Elsevier Applied Surface Science. 2020, V. 527, 146937 https://doi.org/10.1016/j.apsusc.2020.146937 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Graphene quantum dot Hydrogel Photocatalysis Dye photodegradation Peroxidase activity Nanozyme Química analítica Ciencia de materiales Chemistry, Analytic Materials science Graphene quantum dot-based hydrogels for photocatalytic degradation of organic dyes info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Applied Surface Science 527 146937 THUMBNAIL Ibarbia-ass_2020.pdf.jpg Ibarbia-ass_2020.pdf.jpg IM Thumbnail image/jpeg 4425 https://riubu.ubu.es/bitstream/10259/11064/4/Ibarbia-ass_2020.pdf.jpg 771c6465bb318cf0dd3e9d8245ae9e8a MD5 4 LICENSE license.txt license.txt text/plain; charset=utf-8 999 https://riubu.ubu.es/bitstream/10259/11064/3/license.txt b295bcbce42e2caabeb0c623d3860c06 MD5 3 CC-LICENSE license_rdf license_rdf application/rdf+xml; charset=utf-8 805 https://riubu.ubu.es/bitstream/10259/11064/2/license_rdf 4460e5956bc1d1639be9ae6146a50347 MD5 2 ORIGINAL Ibarbia-ass_2020.pdf Ibarbia-ass_2020.pdf application/pdf 1922288 https://riubu.ubu.es/bitstream/10259/11064/1/Ibarbia-ass_2020.pdf fb3807bb0ef65aa5faff745953ef7d28 MD5 1 10259/11064 oai:riubu.ubu.es:10259/11064 2025-11-15 02:05:32.781 Repositorio Institucional de la Universidad de Burgos bubrep@ubu.es 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