Magnitometry and optical Spectroscopy Study of the Photocatalytic Activity of Tio2 Nanopowders Coated by Nib Nanoclustrs using he Electroless Technology
The possibilities for changing the absorption spectra of the anatase modification of the photocatalytic TiO 2
nanopowder were studied with the aim to use more efficiently the energy of UV solar radiation for photocatalysis and to
involve the visible light energy absorption into this process for enhancing the efficiency of the photocatalytic reaction. For
this aim TiO 2 nanopowders coated by NiB nanoclasters have been prepared by original electroless deposition method. The
presence of NiB nanoclasters at the surface of TiO 2 grains was confirmed by measuring the temperature dependence of
magnetization. It was found by optical spectroscopy method that the deposition of Ni-B clusters on the TiO 2 powder
increases significantly the light absorption in the UV region. It was also revealed that, after the deposition of the Ni-B
nanoclusters on the TiO 2 nanopowder, in the result of heat treatment in vacuum, the absorption spectra of the TiO 2
nanopowder was shifted to longer wavelength, and the absorption in the visible part of light spectrum increased. From the
experiments carried out, it follows that the absorption in the visible part of light can be increased as well by selecting the
sizes of nanopowder particles coated with Ni-B clusters. The performed investigations showed that it is possible to enhance
significantly the visible light absorption and the efficiency of the photocatalytic reaction.
Keywords- photocatalysis, magnetometry, optical spectrometry, titanium dioxide, NiB nanoclasters.