Abstract
This paper presents an experimental approach to study catalytic effects of Fe3+modified nanometer titanium dioxide (TiO2) loaded on aluminium oxide (Al2O3). Sol-gel method was used to prepare modified TiO2loaded on carrier. Purification tests were conducted in a self-developed instrument to study catalytic effects of TiO2loaded on Al2O3with different contents through degradation rate. The modification mechanism was studied by scanning electron microscope (SEM). Results showed that loading on Al2O3improved photocatalytic effect of TiO2modified with Fe3+. The best photocatalytic effect was achieved under catalytic action of Al2O3loaded with 10% TiO2composite; the degradation rates were 6.9%, 13.8%, 21.4%, and 49.2%, respectively, 0.7%, 3.9%, 1.3%, and 15.1% larger than unloaded TiO2. SEM results of four catalysts showed that nanometer TiO2was coated in form of grain on the surface of Al2O3. The optimal loading content was 10% at which the nanometer TiO2grains were coated on the surface of Al2O3uniformly.
Highlights
There was a lot of automobile exhaust in the highway tunnels. This exhaust contained a lot of gas phase carbon monoxide (CO), nitrogen oxide (NOX), hydrocarbons, and other pollutants [1]
A few carriers such as metal chemicals could interact with nanometer TiO2 particles, and this interaction was helpful for separation of the electronic hole of nanometer TiO2 particles, which could improve the catalytic effect [14]
The differences shown in each figure represent catalytic action of TiO2 loaded on Al2O3
Summary
There was a lot of automobile exhaust in the highway tunnels. This exhaust contained a lot of gas phase carbon monoxide (CO), nitrogen oxide (NOX), hydrocarbons, and other pollutants [1]. TiO2 powders as a kind of photocatalytic materials had been successfully applied in pollutant disposal, especially in sewage treatment and indoor waste gas purification, and certain achievements have been made [4, 5]. A few carriers such as metal chemicals could interact with nanometer TiO2 particles, and this interaction was helpful for separation of the electronic hole of nanometer TiO2 particles, which could improve the catalytic effect [14]. These researches were mainly used for waste water treatment; few studies were conducted in the aspect of gas purification in tunnels. The goal of this paper was to (1) research catalytic efficiency of nanometer TiO2 loaded on Al2O3 for major kinds of gases in tail gas and (2) study modification mechanism of the composite materials
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