Method for preparing cadmium sulfide-sensitized titanium dioxide nanotube composite semiconductor photocatalyst
A composite technology of cadmium sulfide sensitized titanium dioxide and nanotubes, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of complex preparation methods, achieve simple operation, improve utilization rate, The effect of improving quantum efficiency
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Embodiment 1
[0023] a. Under ice bath conditions, prepare 100ml of NaOH aqueous solution with a concentration of 0.05mol / L and 50ml of CdCl with a concentration of 0.05mol / L 2 Solution, CdCl at 0°C under vigorous stirring 2 Solution (50ml, 0.05mol / L) was added to NaOH solution (100ml, 0.05mol / L) at 0°C to form white Cd(OH) 2 Turbid solution, continue to stir, then add pure ammonia water drop by drop until the solution becomes clear, continue to stir for 3 minutes, then add 100ml of thiourea solution with a concentration of 0.1-1mol / L and stir for 2 minutes to obtain a mixed solution;
[0024] b. Immerse the titanium dioxide nanotube array film into the mixed solution obtained in step a, then seal it, place it in a water bath at 60°C for 1 hour, take out the sample and rinse the sediment on the surface with deionized water, and then dry it in a nitrogen atmosphere Reserved, the sample is recorded as TNA-CdS1h.
[0025] Investigate photocatalytic activity: refers to the degradation and dec...
Embodiment 2
[0028] Referring to Example 1, the difference is that in step b, the titanium dioxide nanotube array film is immersed in the solution obtained in step a, sealed, and then placed in a 60°C water bath for 2h, and finally the photocatalytic activity is investigated. The degradation rate of methyl orange is 90%.
Embodiment 3
[0030] Referring to Example 1, the difference is that in step b, the titanium dioxide nanotube array film is immersed in the solution obtained in step a, sealed, and then placed in a water bath at 60°C for 3 hours. formation of flocculent precipitates. Finally, the photocatalytic activity was examined, and the degradation rate of methyl orange was 60%.
[0031] Such as figure 1 Shown, TiO 2 Only have stronger absorption in ultraviolet region, and its absorption wavelength is about 370nm, and the CdS and TiO of embodiment 1 and embodiment 2 2 The absorption wavelength of the composite semiconductor is about 555nm, and the absorption wavelength of the sample is red-shifted by about 175nm. It can not only absorb ultraviolet light, but also absorb visible light, which effectively expands the range of light absorption, and the photocatalytic degradation of organic pollutants in the composite material can be controlled by Visible light excitation.
[0032] Such as figure 2 sho...
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