Synthesis of corundum-type In 2 O 3 porous spheres and their photocatalytic properties

In this work, polycrystalline indium oxyhydroxide (InOOH) porous spheres were synthesized through a mixed solvothermal method in the presence of sodium citrate (Na 3 cit) as a structure-directing agent. Corundum-type In 2 O 3 porous spheres were obtained via annealing InOOH precursors at 400 °C for...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2014, Vol.2 (15), p.5455-5461
Main Authors: Tao, Binglin, Zhang, Ying, Han, Dezhi, Li, Yanpeng, Yan, Zifeng
Format: Article
Language:English
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Summary:In this work, polycrystalline indium oxyhydroxide (InOOH) porous spheres were synthesized through a mixed solvothermal method in the presence of sodium citrate (Na 3 cit) as a structure-directing agent. Corundum-type In 2 O 3 porous spheres were obtained via annealing InOOH precursors at 400 °C for 2 hours. The samples were characterized by means of X-ray powder diffraction, thermogravimetric analysis, UV-Vis diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy. The Ostwald ripening process was proposed as the mechanism for the formation of porous spheres. Photocatalytic activity of the porous h-In 2 O 3 spheres was evaluated by degrading rhodamine B (RhB) under ultraviolet (UV) irradiation. The results indicated that the porous h-In 2 O 3 spheres possessed superior photocatalytic activity to their counterparts, and could restore 95% of the initial photocatalytic activity after 5 reaction runs.
ISSN:2050-7488
2050-7496
DOI:10.1039/C4TA00139G