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- W4315702528 abstract "TiO2 particles with a specific morphology are essential for their accessibility and photoactivity. The present study shows that NH4OH-based alkaline-hydrothermal treatment affects the transformation of their particle morphology. We investigated the effect of NH4OH by varying the synthesis route. We observed that the TiO2 particles with an open channel pore structure only resulted in the alkaline-hydrothermally treated and calcined samples. Based on Raman and XRD analyses, we figured out the titanate layers as an intermediate phase resulting from the alkaline-hydrothermal treatment of the amorphous particles. The hydrothermal treatment changed the particle surface morphology into a lamellar structure with a high specific surface area. These are the anatase precursors with {200} planes that transform into the anatase phase after calcination. The calcination followed by alkaline-hydrothermal treatment converted the crystallinity without significantly changing their morphology. We found that the morphology of TiO2 particles can be modified via hydrothermal treatment using NH4OH as long as the particles remain uncrystallized. We suggested the modification of particle morphology through the swelling and phase segregation process by alkaline-hydrothermal treatment. All final products have been used for the photodegradation of rhodamine B. S-HT-500 and A-HT-500 show the best photocatalytic activity with their rate constants (k) of 47.9 and 30.9 × 10-2 min-1, and their surface area-normalized rate constants (ksa) of 6.5 and 2.6 × 10-3 L m-2 min-1, respectively, and have a photocatalytic efficiency of 90.93% and 67.78%, respectively, after 10 minutes of UV irradiation. This activity is approximately 3.5 times and 1.5 times higher than that of Degussa P25; 30 times and 20 times higher than that without a photocatalyst." @default.
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- W4315702528 date "2023-01-01" @default.
- W4315702528 modified "2023-10-18" @default.
- W4315702528 title "Contribution of the lamellar morphology to the photocatalytic activity of alkaline-hydrothermally treated titania in rhodamine B photodegradation" @default.
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- W4315702528 doi "https://doi.org/10.1039/d2cp05098f" @default.
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