Effect of Surface Fluorination on Photocatalytic Activity of Titania Nano-Powder

Abstract:

This work, surface fluorination process was used for improvement photocatalytic activity of TiO₂. Photocatalytic activity was observed by degradation of methylene blue (MB). TiO₂ nanopowders were prepared by sol-gel technique from titanium-tetraisopropoxide (TTIP): 2-propanal (2-PP) with the ratios of 1:5, 1:15, and 1:30 (V/V) then adjusted pH by nitric acid at 2. The result showed that grain size of TiO₂ powder decreased as 2-PP ratio increase. The grain sizes of TiO₂ were in the range of 14-25 nm. Photocatalytic activity was considered by characteristic time constant. The results showed that F-TiO₂ presented higher photo-degradation than naked TiO₂. At 1:30 for TTIP: 2-PP ratio with improvement by surface fluorination (F-TiO₂) could degrade MB faster than other samples under weak-UV at irradiation time of 1 hr. The 1:30 sample degraded MB reach to 96%. The results led to conclude that surface fluorination is the good process to improve photocatalytic activity for TiO₂.

• Periodical: Advanced Materials Research (Volume 979)
• Pages: 115-118
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.979.115
• Online since: June 2014
• Authors: Itsarapong Chuasontia*, Khanitta Hathaisamit, Sayan Putwat
• Keywords: F-TiO₂, Mb, Photocatalytic Activity, Surface Fluorination

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