Photocatalytic and Antimicrobial Activities of Undoped and Doped Tio2 Nanoparticle

Abstract

Titanium dioxide (TiO2), Non-metal Doping of TiO2 Photocatalysts, nitrogen Doping, boron doping, sulfur doping, fluorine doping and carbon doped TiO2, review of solid state method and also a brief review of photocatalytic and antimicrobial activity studies. The elaborative details of the characterization techniques like X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), UV-visible spectrophotometer (UV), Photoluminescence spectroscopy (Pl), Field emission scanning electron microscope (FE-SEM) and Energy Dispersive X-ray Analysis (EDX) used in this work were discussed. The choices of the analytical instruments were based on their speed, economical efficiency and sensitivity without complex procedures. X-Ray diffraction analysis carried out on the samples was used to calculate the particle size, strain, stress dislocation density. An elaborate study of the functional groups present in the samples and the stretching vibrations of hydroxyl groups. An elaborate study of the different shapes is discussed. The EDX analysis studied gives qualitative as well as quantitative status of elements. A brief discussion of the two optical studies (a) UV-vis spectroscopy, (b) photoluminescence studies of undoped and doped titanium dioxide nanoparticles. The UV-vis absorption spectroscopy measures the percentage of radiation that is absorbed at each wavelength. Photoluminescence (PL) spectroscopy measures the intensity of luminescence as a function of wavelength, temperature, excitation intensity, and time. Undoped TiO2 nanoparticles exhibit plasmon absorption bands that depend on their size and shape. The antibacterial activity was done on various pathogenic bacteria, which are commonly present in water. The results of the antibacterial tests show the ability of these prepared nanoparticles to inhibit the growth of both gram positive and gram negative pathogenic bacteria. In this case, the antibacterial activity is completely dependent on the size, shape, crystalline nature of the particles.