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Spherical and nanoporous TiO 2 and TiO 2 –SiO 2 mixed micro-particles with four different compositions (20/80, 50/50, 80/20, 90/10 in weight ratio of TiO 2 /SiO 2 ) were prepared by spray drying method from colloidal mixtures of amorphous silica and anatase titania nanoparticles. The as-prepared particles were heat-treated at 900°C for 0.5–5h. The TiO 2...
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