Abstract
ABSTRACT TiO 2 nanomaterials were prepared by a sol-gel derived electrospinning, calcination from 500 o C to 650 o C, and subsequent mechanical grinding to investigate the effect of calcination temperature on crystal structure, crystallinity, and photocatalytic activity of methylene blue (MB). XRD results indicated that TiO 2 nanorods calcined at 500 o C is composed of anatase TiO 2 only. However, mixed crystals of anatase and rutile were observed for TiO 2 calcined above 550 o C. Higher MB degradation was found for the TiO 2 nanorods calcined at 550 o C probably due to the mixed crystals and larger surface area. However, the improved photocatalytic activity was achieved for TiO 2 nanotube due to the synergic combinations of mixed crystals, larger specific surface area, and light trapping effect. Keywords: TiO 2 , nanofiber, nanorod, nanotube, photocatalytic activity, methylene blue 1. INTRODUCTION TiO 2 photocatalysts have been investigated extensively for envi ronmental applications such as air, water treatment and deodorizer, because of its strong oxidizing power, high photocatalytic activity, self-cleaning function, bactericidal and detoxification activity.
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