Photocatalytic Degradation ofNOxUsing Ni-Containing TiO2

摘要

The nickel-containing titania was synthesized and employed in the photomineralization ofNOx. A nickel-modified titania photocatalyst was prepared by photodeposition method with using Degussa-P25 TiO2particle and nickel chloride as raw materials, respectively. The physical analyses were carried out using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmittance electron microscope (TEM), and photoluminescence spectroscopy (PL), to observe changes in particles following nickel modification. The results showed that Ni does not enter into theTiO2crystal lattice and is dispersed onto theTiO2surface uniformly. Ni improved the intensity of PL spectra with an appropriate Ni content on theTiO2surface. The modified titanium dioxide with 0.1 mol% of nickel exhibited two times theNOx-removal activity of bareTiO2under ultraviolet illumination. The nickel content in this photodeposition process plays an important role in affinity toNOxmolecules, recombination rate of electron-hole pair, and content of active site on theTiO2surface and therefore affects the optical and photocatalytic properties.