Congo red decomposition by photocatalytic formation of hydroxyl radicals (·OH) using titanium metal–organic frameworks

In this work, two well-known titanium-type metal–organic framework (MOF) solids named MIL-125 and MIL-125-NH 2 were successfully synthesized using a solvothermal method. The structure of the catalytic materials was confirmed by X-ray powder diffraction, infrared spectroscopy, N 2 adsorption–desorpti...

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Bibliographic Details
Published in:Transition metal chemistry (Weinheim) 2019-01, Vol.44 (1), p.77-87
Main Authors: Castellanos, Nelson J., Martinez Rojas, Zulied, Camargo, Hernando A., Biswas, Shyam, Granados-Oliveros, Gilma
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Organometallic Chemistry
Physical Chemistry
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Summary:In this work, two well-known titanium-type metal–organic framework (MOF) solids named MIL-125 and MIL-125-NH 2 were successfully synthesized using a solvothermal method. The structure of the catalytic materials was confirmed by X-ray powder diffraction, infrared spectroscopy, N 2 adsorption–desorption measurements, thermogravimetric analysis and UV–Vis diffuse reflectance spectroscopy analysis. An azo dye, Congo red, was used as model pollutant to study its photocatalytic activity under UV–Vis light irradiation. A comparison with the commercial TiO 2 P-25 revealed both the beneficial effect of the porous structure of MOFs and the influence of the –NH 2 group on the light activation process. Formation of hydroxyl radicals ( · OH) by catalysts was evaluated by luminol degradation probing. Finally, the titanium MOF catalysts can be recycled and reused without significant loss of activity.
ISSN:0340-4285
1572-901X
DOI:10.1007/s11243-018-0271-z