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Preparation and application of composite photo-catalysis bactericide for visible light response

A technology of photocatalyst and catalyst, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the problems of low quantum efficiency and application limitations

Inactive Publication Date: 2011-06-08
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past few years, Chinese patents have disclosed several preparation methods and applications of photocatalytic sterilization and antibacterial agents, most of which use TiO 2 As a photocatalyst, TiO 2 The limitation of its semiconductor band gap can only absorb about 5% of the sun's ultraviolet light, which limits its application, and TiO 2 Low quantum efficiency as a photocatalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh the CuCr baked at 500-600°C 2 o 4 and TiO 2 Prepared to a concentration of 10 4 CFU / mL Escherichia coli suspension, so that the concentration of photocatalyst is 1.0-3.0 μg / mL, and the photocatalytic sterilization experiment is carried out according to the above experimental process. Under the same conditions, the control experiment and the blank experiment without catalyst were carried out in the dark. Experiments show that: within 30min, CuCr 2 o 4 The sterilization rate is 71.2%, TiO 2 The bactericidal rate was 80.8%, while the control experiment with catalyst in the dark had almost no bactericidal effect, and the bactericidal rate of the blank experiment without catalyst under light was less than 5%. According to the above experimental process, after 1-3 times of leaching treatment, they were roasted at 500-600°C for 1-3 hours to obtain CuCr-containing 2 o 4 and TiO 2 antibacterial tiles, the concentration will be 10 5 1 mL of E. coli solution with C...

Embodiment 2

[0021] Weigh TiO 2 70% composite nano CuCr 2 o 4 -TiO 2 The sample was prepared at a concentration of 10 4 For Escherichia coli suspension in CFU / mL, the concentration of photocatalyst is 1.0-3.0 μg / mL, and the photocatalytic suspension sterilizing experiment is carried out according to Example 1, and the bactericidal rate after 30 minutes is 92.2%. Carry out ceramic tile, plywood surface sterilizing experiment according to embodiment 1 with this composite photocatalyst, be that the E. coli solution of 105CFU / mL is experimented according to embodiment 1 with concentration, after 30min, sterilization rate is respectively 91.4% and 86.6%. In the sunlight sterilization experiment under the same conditions, after 30 minutes, the sterilization rates were 90.1% and 83.6%, respectively. The results of the control experiment and the blank experiment under the same conditions were the same as those in Example 1.

Embodiment 3

[0023] Weigh TiO 2 80% composite nano CuCr 2 o 4 -TiO 2 The sample was prepared at a concentration of 10 4 For Escherichia coli suspension in CFU / mL, the photocatalyst concentration is 1.0-3.0 μg / mL. The photocatalytic suspension sterilizing experiment was carried out according to Example 1, and the bactericidal rate was 100% within 30 minutes. With the composite nano-CuCr 2 o 4 -TiO 2 Carry out ceramic tile, plywood surface sterilization experiment, will concentration be 10 5 The Escherichia coli solution of CFU / mL was carried out as in Example 1, and after 30 minutes, the sterilization rates were 96.1% and 93.9% respectively. In the sunlight sterilization experiment under the same conditions, after 30 minutes, the sterilization rates were 92.5% and 86.9%, respectively. The results of the control experiment and the blank experiment under the same conditions were the same as those in Example 1.

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Abstract

The invention relates to application of a nano composite material serving as a photo-catalysis sterilization antibacterial agent responding to visible light. The photo-catalysis material is a complex of copper chromate and titanium dioxide, and has good killing effect on escherichia coli under the irradiation of the visible light. In suspension, the photo-catalyst performs an analog sunlight catalysis sterilization experiment for 104CFU / mL escherichia coli; and when the consumption of the photo-catalyst is 1.0 to 3.0mug / mL, the mass percentage of TiO2 in the composite photo-catalyst is 70 to 90 percent, and the sterilization rate after 30 minutes reaches over 90 percent. When the analog sunlight catalysis sterilization experiments are performed on a ceramic tile coated with the photo-catalyst and a veneer coated with a coating containing the photo-catalyst, the sterilization rates after 30 minutes are over 90 percent and 85 percent respectively; and when the sunlight sterilization experiments are performed under the same condition, the sterilization rates after 30 minutes are over 90 percent and 83 percent respectively, so the sterilization effect of the composite photo-catalyst is obviously superior to that of a single photo-catalyst.

Description

technical field [0001] The invention relates to a preparation method and application of a nanocomposite material responsive to visible light as a photocatalytic bactericidal and antibacterial agent. The photocatalytic material is CuCr 2 o 4 with TiO 2 It has a good killing effect on coliform bacteria under visible light irradiation. Background technique [0002] Since the discovery of TiO 2 Since it has a good bactericidal effect under ultraviolet light, TiO 2 The photocatalytic effect and bactericidal mechanism of the photocatalyst have been paid attention to. The antibacterial effect of photocatalysts is based on the photoelectric characteristics of photocatalytic semiconductor materials. Photocatalytic semiconductors are composed of low-energy valence bands filled with electrons and empty high-energy conduction bands. When light of a certain wavelength is irradiated on the surface of photocatalytic material grains, it will absorb light waves less than or equal to the...

Claims

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Application Information

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IPC IPC(8): B01J23/85B01J23/72B01J21/06B01J37/06A61L2/10A61L2/23
Inventor 阎建辉张丽唐课文易健民侯朝辉潘阳
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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