Non-destructive covalent surface alkylation of graphitic carbon nitride for enhanced photocatalytic dye degradation in water

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Arat, Refik and Fidan, Tuçe and Yüce, Meral and Kurt, Hasan and Bayazıt, Mustafa Kemal (2024) Non-destructive covalent surface alkylation of graphitic carbon nitride for enhanced photocatalytic dye degradation in water. FlatChem, 43 . ISSN 2452-2627

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Abstract

Graphitic carbon nitride (g-CN) is a promising material for various applications due to its unique electronic, optical, and photocatalytic properties, tunable by surface modifications. Herein, a novel and straightforward approach to the covalent addition of low molecular weight polyethylene glycol (PEG550) to g-CNs surface following non-destructive chemistry benefiting from simultaneous activation of hydroxyl and free-amine surface groups by a weak base, potassium carbonate, is for the first time described. The resulting g-CN-PEG550 exhibits almost two-fold enhanced water solubility due to 1 PEG550 chain addition for every ∼ 128 g-CN atoms, detected by thermogravimetric analysis. Complementary X-ray photoelectron spectroscopy elemental analysis of the isolated g-CN-PEG550 displays an increased C─O chemical environment attributed to the covalent addition of carbon- and oxygen-rich PEG550 to the g-CN surface. The g-CN-PEG550 photocatalyst performs 2.5-fold better in degrading rhodamine B due to its enhanced light absorption, improved water-dispersibility, and the efficient separation of photogenerated electron-hole pairs compared to the as-prepared g-CN. The study underscores the potential use of covalently PEGylated oxygen-rich g-CNs in photocatalytic applications.
Item Type: Article
Uncontrolled Keywords: Dye degradation; Graphitic carbon nitride; Non-destructive alkylation; Oxygen-rich photocatalyst; Rhodamine B
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Refik Arat
Date Deposited: 07 Jun 2024 20:18
Last Modified: 07 Jun 2024 20:18
URI: https://research.sabanciuniv.edu/id/eprint/49019

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