Photocatalytic Oxidation of Carbon Monoxide over Nanocomposites under UV Irradiation

Abstract

The NiO/SnO 2 nanocomposites have been prepared by the simple coprecipitation method and further characterized by the XRD, SEM, TEM, UV-Vis, and BET. X-ray diffraction (XRD) data analyses indicate the exclusive formation of nanosized particles with rutile-type phase (tetragonal SnO 2 ) for Ni contents below 10 mol%. Only above 10 mol% Ni, the formation of a second NiOrelated phase has been determined. The particle size is in the range from 12 to 6 nm. It decreases with increasing amounts of doping NiO. The morphology of NiO-doped SnO 2 nanocrystalline powders is spherical, and the distribution of particle size is uniform, as seen from transmission electron microscopy (TEM). The photocatalytic oxidation of CO over NiO/SnO 2 photocatalyst has been investigated under UV irradiation. Effects of NiO loading on SnO 2 , photocatalyst loading, and reaction time on photocatalytic oxidation of CO have been systematically studied. Compared with pure SnO 2 , the 33.3 mol% NiO/SnO 2 composite exhibited approximately twentyfold enhancement of photocatalytic oxidation of CO. Our results provide a method for pollutants removal. Due to simple preparation, high photocatalytic oxidation of CO, and low cost, the NiO/SnO 2 photocatalyst will find wide application in the coming future of photocatalytic oxidation of CO.

Water splitting behavior of copper-cerium oxide nanorods and nanocubes using hydrazine as a scavenging agent

“…Mixed oxide nanostructures such as TiO 2 , SiO 2 , CaTiO 3 , etc. have been successfully synthesized by the hydrothermal assisted microwave method (Hy-MWM) and used in applications such as water depollution, air purification, sensors and photocatalytic water splitting among many other applications [4][5][6][7][8].…”

Zeolite Y from rice husk ash encapsulated with Ag-TiO2: characterization and applications for photocatalytic degradation catalysts

“…Given the current concern regarding environmental issues, it is anticipated that applications for TiO 2 will grow at increasing speed; in particular, urgent improvement of the TiO 2 photocatalytic degradation is needed for large-scale industrial treatment processes, such as wastewater treatment and de-NOx. From the green chemistry viewpoint, the photocatalytic decomposition of organic compounds in wastewater has attracted a great deal of attention [11][12][13][14][15][16][17][18][19][20][21][22]. The TiO 2 is one of the most effective photocatalysts because it is generally biologically and chemically inert, and is photostable with near-UV band gap energy.…”

“…The fine TiO 2 powder, or crystals, can be dispersed in the water, in order to be clarified by irradiation; however, they must be removed by filtering after reaction, which is troublesome and costly. Thus, in order to solve this problem, many researchers have examined methods of fixing TiO 2 on other supporting materials, including glass beads [20][21][22], fiberglass [23][24][25], silica [26,27], an electrode [28], and zeolite [29,30]. Recently, some researchers have used zeolite as hosts to fix semiconductors, due to its unique, uniform pores and channel size.…”

Influence of Cu doping on structural, optical and photocatalytic activity of SnO2 nanostructure thin films

“…In most countries researchers are looking for appropriate treatments in order to remove pollutants, impurities and to obtain the decolourization of dye house effluents [1]. Metal oxide semiconductors with small and medium band gaps show lower light-harvesting ability in visible light [2]. Therefore, coupling of semiconductors with different band gaps is a good approach to prepare photo catalysts with high activity and good stability.…”