A low-temperature preparation method of tio2 thin film with high photocatalytic activity
A technology of photocatalytic activity and thin film, applied in the direction of catalyst activation/preparation, chemical instruments and methods, organic compound/hydride/coordination complex catalyst, etc. problems, to achieve the effect of improved adhesion, simple preparation process and stable performance
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Embodiment 1
[0035] See image 3 , Add 1 volume of concentrated nitric acid (69% by mass) into 100 volumes of deionized water for pre-mixing, then mechanically stir in an ice water bath, then add 10 volumes of titanium tetraisopropoxide, and then place it in the ice water bath Continue mechanical stirring for 3 hours to make it evenly dispersed to obtain a solution. The above solution is sealed and aged at room temperature for 2 weeks to obtain TiO 2 Sol. Use TiO 2 5 times the volume of the sol volume of ethanol on TiO 2 Dilute the sol and add TiO 2 TiO in sol 2 The mass of 20% silica sol (JN-20) is mixed uniformly, and the film is coated on the surface of the substrate by spraying at room temperature to obtain TiO with high-efficiency photocatalytic activity 2 film. The cross-hatch method (ISO 2409-1992) was used to characterize the adhesion of the coated film, and the NO degradation rate of the sample was tested. Characterization results are shown in Table 1 and figure 1 .
Embodiment 2
[0037] Add 1 volume of concentrated nitric acid (69% by mass) into 100 volumes of deionized water, perform pre-mixing, then mechanically stir in an ice water bath, and then add 10 volumes of titanium tetraisopropoxide, and continue in the ice water bath. Stir mechanically for 3 hours to make it evenly dispersed to obtain a solution. The above solution is sealed and aged at room temperature for 2 weeks to obtain TiO 2 Sol. Use TiO 2 7 times the volume of the sol volume of ethanol on TiO 2 Dilute the sol and add TiO 2 TiO in sol 2 The mass of 10% polyethylene glycol (PEG-400) is mixed uniformly, and the coating is applied to the surface of the substrate by spraying at room temperature to obtain TiO with high-efficiency photocatalytic activity 2 film. The cross-hatch method (ISO 2409-1992) was used to characterize the adhesion of the coated film, and the NO degradation rate of the sample was tested. Characterization results are shown in Table 1 and figure 1 .
Embodiment 3
[0039] Add 1 volume of concentrated nitric acid (69% by mass) into 100 volumes of deionized water, perform pre-mixing, then mechanically stir in an ice water bath, and then add 10 volumes of titanium tetraisopropoxide, and continue in the ice water bath. Stir mechanically for 3 hours to make it evenly dispersed to obtain a solution. The above solution was sealed and aged at room temperature for 2 weeks to obtain TiO 2 Sol. TiO 2 Use 5 times the volume of ethanol to TiO 2 Dilute the sol and add TiO 2 TiO in sol 2 The mass of 0.5% polymer resin (epoxy resin) is mixed evenly, and the coating is applied to the surface of the substrate by spraying at room temperature to obtain TiO with high-efficiency photocatalytic activity 2 film. The cross-hatch method (ISO 2409-1992) was used to characterize the adhesion of the coated film, and the NO degradation rate of the sample was tested. Characterization results are shown in Table 1 and figure 1 .
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