Photocatalytic Degradation of NOx Using Ni-Containing TiO2

Abstract EN

The nickel-containing titania was synthesized and employed in the photomineralization of NOx.

A nickel-modified titania photocatalyst was prepared by photodeposition method with using Degussa-P25 TiO2 particle 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 the TiO2 crystal lattice and is dispersed onto the TiO2 surface uniformly.

Ni improved the intensity of PL spectra with an appropriate Ni content on the TiO2 surface.

The modified titanium dioxide with 0.1 mol% of nickel exhibited two times the NOx-removal activity of bare TiO2 under ultraviolet illumination.

The nickel content in this photodeposition process plays an important role in affinity to NOx molecules, recombination rate of electron-hole pair, and content of active site on the TiO2 surface and therefore affects the optical and photocatalytic properties.