New method of high effective photocatalytic reaction under atmosphere of H2-02 and method for producing photocatalyst
A photocatalytic reaction, H2-O2 technology, applied in the field of environmental pollution control, can solve the problem of low efficiency of photocatalytic technology
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Embodiment 1
[0024] available for H 2 -O 2 High-efficiency photocatalyst under atmosphere——Preparation of platinized titania photocatalyst
[0025] The analytically pure solution of isopropanol titanate is slowly dropped into deionized water, and the molar ratio of isopropanol titanate to deionized water is 1%-90%, preferably 1%-30%. Use nitric acid analysis to adjust the pH value of the solution to 2-4, and stir at room temperature for 1-3 days to obtain a clear titanium dioxide sol, which is further dialyzed until the pH value of the sol is 3-6. Dry at 40°C-70°C Sol, during the drying process, the sol undergoes dehydration polymerization to form amorphous titanium oxide xerogel. The xerogel is roasted at 200°C-550°C for 2-8 hours to convert 30-95% of the amorphous titanium dioxide into anatase titanium dioxide, and sieve the heat-treated sample to 30-100 mesh to obtain a titanium dioxide photocatalyst. The specific surface area of the photocatalyst is 30m 2 / g-180m 2 / g, the grain...
Embodiment 2
[0030] Effect of Platinized Titanium Dioxide Photocatalyst on Photocatalytic Degradation of Benzene
[0031] As shown in Figure 2, 50 mg of platinized titanium dioxide photocatalyst and titanium dioxide photocatalyst were respectively loaded into two miniature quartz tubes that can react continuously at normal pressure, and the two quartz tubes were placed under the irradiation of four ultraviolet lamps , the emission wavelength of the ultraviolet lamp is 254nm, and the light intensity is 0.5-5mW·cm -2 , preferably 1-3mW·cm -2 , feed reaction gas into the two quartz tubes, the reaction gas is composed of hydrogen, oxygen, nitrogen and refractory toxic organic pollutant benzene, wherein the volume concentration of benzene is 845ppm, the hydrogen content is 1.56%, the content of hydrogen and oxygen The molar ratio is 0-1.872, preferably 0.01-0.7, and nitrogen is the diluent gas. The reaction gas flow rate was 50ml / min, the reaction temperature was 30°C, and the reaction produc...
Embodiment 3
[0035] Effect of Reaction Atmosphere on Photocatalytic Degradation of Benzene
[0036] The reaction system of Example 2 was used to investigate the ability of the platinumized titanium dioxide photocatalyst to photocatalytically degrade benzene in a hydrogen or oxygen atmosphere. In the hydrogen atmosphere, the volume content of hydrogen is 1.56%, nitrogen is the diluent gas, and in the oxygen atmosphere, the content of the diluent nitrogen is equivalent to that of oxygen, and other reaction conditions are the same as in Example 2.
[0037] It can be seen from Figure 3 that in a hydrogen atmosphere, the platinumized titanium dioxide photocatalyst has no obvious photocatalytic activity on benzene, and rapidly deactivates within 20 minutes. After 6 hours of reaction, the photocatalyst changes from the original white to brown, with obvious accumulation Carbon species are generated, deactivating the photocatalyst. Moreover, no hydrogenation intermediates such as cyclohexene or cy...
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