Porous nitrogen-doped TiO2/graphene oxide derived from H2N-MIL-125(Ti)/graphene oxide composites as highly efficient visible light active photocatalysts for the degradation of dyes and carbamazepine
Bakhadur A. Alem H. Carré V. Gries T. Balan L. Cantin J.-L. Medjahdi G. Orazov Z. Uralbekov B. Schneider R.
30 December 2025Elsevier B.V.
Applied Surface Science
2025#714
Due to the increasing release of pollutants in the environment, the development of efficient photocatalysts has become a major issue for water decontamination. Herein, heterostructured photocatalysts associating N-doped TiO2 (N-TiO2) and graphene oxide (GO) were prepared by thermolysis of the H2N-MIL-125(Ti) MOF combined with GO. The high porosity of H2N-MIL-125(Ti) is partially transferred to N-TiO2 by calcination at 450 °C allowing the synthesis of porous N-TiO2/GO catalysts with a specific surface area up to 131 m2/g. TEM shows that N-TiO2/GO catalysts are composed of ca. 13 nm-sized N-TiO2 particles deposited on GO sheets. GO not only allows to improve the light absorption in the visible range but also to enhance the charge carrier separation as demonstrated by photoluminescence and (photo)electrochemical measurements. The highest photocatalytic activity was reached for N-TiO2 combined with 30 wt% GO and the obtained catalyst exhibits high activity for the degradation of dyes (Orange II and Eosin Y) and of the Carbamazepine drug under visible light irradiation. Radical scavenging experiments show that superoxide radicals O2[rad]−, holes h+ and singlet oxygen 1O2 play a major role in the photodegradation process. The N-TiO2/GO(30) photocatalyst also exhibits high stability and reusability and therefore has a high potential for real environmental applications.
Graphene oxide , H2N-MIL-125(Ti) , Heterostructured photocatalysts , N-doped TiO2 , Photocatalytic degradation
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Université de Lorraine, CNRS, LRGP, Nancy, F-54000, France
Al-Farabi Kazakh National University, Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Av., 71, Almaty, 050040, Kazakhstan
Université de Lorraine, CNRS, IJL, Nancy, F-54000, France
Université de Lorraine, LCP-A2MC, Metz, F-57000, France
CNRS, Université dOrléans, CEMTHI, 1 Av. de la Recherche Scientifique, Orléans, France
Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, UMR7588, Paris, F-75005, France
Université de Lorraine
Al-Farabi Kazakh National University
Université de Lorraine
Université de Lorraine
CNRS
Sorbonne Université
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