Investigations of Annealing Temperature on Crystal Structure, Morphology, Optical Characteristic and Photocatalytic Activity of TiO2/Zn0,4Ni0,6Fe2O4 Nanocomposites for Liquid Waste Treatment Applications of Textile Dyes (Rhodamine B)
Khorifathul Khoiriyah, Arisma Nurul Fauziyah, Vindy Yurike Oktavia, Ahmad Taufiq and Joko Utomo*

Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang,
Jl. Semarang 5 Malang 65145, Indonesia
*joko.utomo.fmipa[at]um.ac.id

Abstract

The composite nanoparticles TiO2/Zn0,4Ni0,6Fe2O4 had been synthesized using the Co-precipitation method with the annealing temperature of 200, 400, 600, 800 and 1000C for three hours. The synthesized samples were characterized using XRD, TEM, FTIR, UV-Vis and tested for their photocatalyst activities. The crystal structure of the TiO2/Zn0,4Ni0,6Fe2O4 nanocomposite shows TiO2 with anatase structure (a=b=3.79A - dan c=9.50A), whereas the rutile phase begins to form when the temperature reaches >600C. In addition increasing the annealing temperature causes the increase of crystal size from 9 nm at annealing temperature of 200C-. The morphology of the TiO2/Zn0,4Ni0,6Fe2O4 showed oval-shaped nanoparticles with a range of particle size from 46.32- 84.52 nm with the upward trend by giving annealing temperature. The value of energy band gap of the TiO2/Zn0,4Ni0,6Fe2O4 nanocomposite at 200, 400, 600, 800 and 1000C were 2.64, 3.04, 2.88, 2.62, and 3.03 eV, respectively. Meanwhile the highest percentage (%) of degradation was 43,23% for 120 minutes using the TiO2/Zn0,4Ni0,6Fe2O4 nanoparticles which was annealed at 200C. It was due to the smallest crystal size and a relatively small energy band gap obtained.

Keywords: The composite nanoparticles TiO2/Zn0,4Ni0,6Fe2O4- annealing temperature- coprecipitation- photocatalyst- Rhodamine B

Topic: Catalyst and photocatalyst