Congo red decomposition by photocatalytic formation of hydroxyl radicals (·OH) using titanium metal–organic frameworks
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Abstract
In this work, two well-known titanium-type metal–organic framework (MOF) solids named MIL-125 and MIL-125-NH2
were successfully synthesized using a solvothermal method. The structure of the catalytic materials was confirmed by X-ray
powder diffraction, infrared spectroscopy, N2
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 TiO2
P-25 revealed both the beneficial effect of
the porous structure of MOFs and the influence of the –NH2 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.
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Castellanos, N. J., Martinez Rojas, Z., Camargo, H. A., Biswas, S., & Granados Oliveros, G. (2018). Congo red decomposition by photocatalytic formation of hydroxyl radicals (·OH) using titanium metal–organic frameworks. Bogotá: doi:10.1007/s11243-018-0271-z
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