Characterization of TiO۲, and Polymethylmethacrylate Nanofilms and Nanocomposites for Archaeological Buildings

Archaeological buildings form the urban core of historical cities as a sign of urban life in society. Nanotechnology started to preserve heritage buildings. This study aimed to synthesize an optimal N: Ni: TiO۲ photocatalyst, from TiO۲ nanoparticles, as a nanofilm on chromatic tile surface and the N: Ni: TiO۲/Polymethyl methacrylate as nanocomposite film on bricks for respiration functionality. The nanofilm and nanocomposite were synthesized and coated on historical samples to reduce the impact of Volatile Organic Components (VOC) and water penetration. The nanocatalyst was characterized using different techniques. The Fourier-transform infrared spectroscopy showed the Ti-O-Ti stretching vibration absorption mode and N and Ni ions in the TiO۲ lattice. The X-ray diffraction analysis patterns exposed the anatase main peak and signs of dopants. The Scanning electron microscopy analysis was carried out N: Ni: TiO۲ (۰.۰۲۴:۰.۰۲۴:۰.۲۷ with ۰.۸ M nitric acid and retention time of ۲۰s) (E), nanoparticles with an average size of ۴۸.۴۸ nm. The energy dispersive X-ray analysis spectrometer confirmed Ti, O, N, and Ni bonding in a N: Ni: TiO۲(E) photocatalyst. The co-dopants and single-bond dopants were found to be uniformly distributed in TiO۲ matrix. The UV–Vis diffuse reflectance spectroscopy showed, an increase in visible light absorption by N: Ni: TiO۲(E) when the wavelength was >۴۰۰ nm. It was mainly due to the change in electron trap ability using N/Ni. In addition, Ni-N-TiO۲ nanoparticles show enhanced activity compared with Ni-TiO۲. Also, results show Ni and N co-doped TiO۲ is a promising photocatalyst to degrade methylene blue under visible light. For N: Ni: TiO۲ (E)= (۰.۰۲۴: ۰.۰۰۹۹:۰.۲۷ M loading), with ۰.۸ M nitric acid and retention time of ۱۰s films, Methylene blue degradation on white and violet chromatic tiles were ۶۳% and ۳۰% respectively. The antibacterial degradation test showed cut off of E. coli colonies’ growth on the tile surface.

کلیدواژه ها:

nanoparticles ، Dopant ، Chromatic tile ، Heritage building ، Antibacterial surface