화학공학소재연구정보센터
Powder Technology, Vol.318, 465-470, 2017
Immobilization of photocatalytically active TiO2 nanopowder by high shear granulation
Nano-TiO2 powder is known to show high photocatalytic reactivity in the degradation of several organic pollutants. In this work, the powder was fixed on the surface of SiO2 granules with the size of several micrometers using a high shear granulation process. Nanozirconia sol was applied as an inorganic binder. When the samples were tempered at 300 degrees C, they showed high stability in an aqueous solution for several hours. An energy dispersive x-ray spectroscopy (EDX) analysis confirmed that the cores and shells of the granules consisted solely of SiO2 and TiO2 respectively, and that ZrO2 was found throughout the whole granules. Methylene blue (MB) was employed as a model system to evaluate the photocatalytic activity of the TiO2 nanopowder and coated granules. It was shown that the TiO2-coated granules lead to the degradation of MB under UV irradiation, whereas no effect was observed in the dark. After the degradation experiments the granules could be recovered and they remained active for further applications. (C) 2017 Elsevier B.V. All rights reserved.