Study of photocatalytic activity and magnetic properties of Co, Mn metal ions doped nanocrystalline TiO2 prepared by Sol–Gel method

Autor: Kirit Siddhapara, D. V. Shah
Rok vydání: 2016
Předmět:
Zdroj: Journal of Crystal Growth. 452:158-161
ISSN: 0022-0248
DOI: 10.1016/j.jcrysgro.2016.03.016
Popis: We report the growth of [Mn, Co] x TiO 2 ( x =0.01, 0.02 and 0.04) nanocrystals prepared by Sol–Gel technique, followed by freeze-drying treatment at −30 °C temperature for 12 h. The obtained Gel was thermally treated at different temperatures like 200, 400, 600 and 800 °C. The average crystalline size of 6–60 nm is achieved. The diffraction peak at 25.22°, 25.49° and 25.6° shows that the main crystal phase is anatase without any indication of other phases. Transition metal doping leads to the reduction in the oxygen vacancies on the TiO 2 surface and suppresses the crystallization of other phases by adsorbing onto the surface of the TiO 2 particles. The peak at 27.47° indicates the presence of the rutile phase at 800 °C. Valence metal cation, Mn, Co ions can react with Ti 4+ on the surface of TiO 2 , and Ti 4+ is reduced to Ti 3+ which inhibits the transformation of anatase to rutile. The photocatalytic degradation of formaldehyde has been successfully demonstrated using a 250 W UV. The binary doped transition metal ions in TiO 2 nanoparticles can lead the efforts of enhancing their environmental application as photocatalyst. Magnetic measurement was carried using VSM. The magnetic susceptibility of the Mn, Co doped TiO 2 nanopowder increases with increase in doping concentration and exhibits room temperature ferromagnetism.
Databáze: OpenAIRE
Externí odkaz: