Excellent Photocatalytic Activity of Mixed Phase Ultra Slim TiO2 Nanofibers for the Degradation of Organic Wastes
Authors: Sarkar, D.; Maiti, U. N.; Ghosh, C. K.; Chattopadhyay, K. K.
Source: Advanced Science Letters, Volume 6, Number 1, March 2012 , pp. 127-133(7)
Publisher: American Scientific Publishers
Abstract:The photocatalytic degradation of the organic dyes has been performed in the presence of ultra slim (10–20 nm diameters) titanium dioxide (TiO2 nanofibers synthesized through low-temperature sol–gel technique in organic medium. The calcination of the prepared fibers in air at 500 °C for 3 hrs led to a mixture of almost 50% anatase and 50% rutile phases that exhibited higher photocatalytic activities due to a synergistic effect. The TiO2 fibers were characterized by X-ray diffraction, field emission scanning electron microscopy, energy dispersive analysis of X-ray, high resolution transmission electron microscopy and UV-Vis spectroscopy. The photodegradation of different dyes like orange-II (acid orange 7), methyl orange (acid orange 52) and rhodamine B were studied which followed the Langmuir–Hinshelwood (L–H) kinetic model with pseudo-first-order apparent rate 4.15×10–2, 7.72×10–2 and 3.53×10–2 min–1. Particularly the mixed phase TiO2 nanofibers exhibited superior photodegradation performance for the rhodamine B, which completely degraded at only 120 mins.
Document Type: Research Article
Publication date: March 1, 2012
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