Indium-Sensitized UV Photocatalysts Made from Alkali Titanate Microfibers
Indium-alkali microfibers doped ceramic were prepared by the sol-gel process. The gels preparation samples, were heat treated at 700°C for different length of time. The products were characterized by means of XRD, SEM-EDS and UV–Vis-DRS. The XRD showed the formation of the Na2Ti6O13 phase whose crystallinity depends on the annealing time. The band gap calculated from the UV–Vis Kubelka-Munk function shows very similar values (3.53-3.55 eV). The SEM images of the indium-alkali titanates show microfiber clumps morphologies of about 5 µm, and the EDS spectra show that In2O3 is on the Na2Ti6O13 surface. The results of the evaluation of the In-Na2Ti6O13 semiconductors in the 2, 4-dichlorophenoxyacetic acid (2, 4-D) photodecomposition under UV light irradiation, show that the photoactivity depends on the time of heat treatment of the samples.
Hyungsun Kim, JienFeng Yang, Tohru Sekino and Soo Wohn Lee
L. M. Torres-Martínez et al., "Indium-Sensitized UV Photocatalysts Made from Alkali Titanate Microfibers", Materials Science Forum, Vols. 620-622, pp. 651-654, 2009