Brief introduction of project results

In recent years, bacteria and viruses have posed a great threat to human health. Common sterilization methods include gamma ray sterilization, dry heat sterilization, moist heat sterilization, filtration sterilization and chemical reagent sterilization. Among them, gamma ray sterilization, dry heat sterilization, moist heat sterilization and filtration sterilization all require the use of specific instruments and equipment, and the conditions are harsh. Chemical reagent sterilization often uses formaldehyde, ethylene oxide, peracetic acid, silver ion and other reagents, but these reagents have certain toxic side effects on human body and environment. 

Based on the fact that semiconductor materials can produce active oxygen species under light excitation, photocatalysis technology is considered as a low-cost, environmentally friendly advanced oxidation technology and a green way to efficiently inactivate various microorganisms. Among them, bismuth oxyiodide is a new visible light responsive photocatalyst because of its moderate band gap and strong oxidation ability of photogenerated holes. However, due to the high recombination rate of photogenerated electron-hole pairs, the application of bismuth oxyiodide monomer is limited.

In this project, by in-situ reaction, tight heterostructures were formed between carbon points, carbon nitride and bismuth iodide, which effectively reduced the photogenerated electron-hole pair recombination probability of composite materials. The preparation method is simple and easy to achieve industrial production, and has good application prospect and practical value. The composite material has good visible light (including LED light) to inactivate E. coli, Staphylococcus aureus and other harmful bacteria, and can be used in the field of photocatalytic antibacterial, such as antibacterial fabric surface coating.

Performance indicators

1. The mass percentage of carbon point, carbon nitride and bismuth oxyiodide in the composite is 1-8%, 5-30% and 69-94%.

2. Under the irradiation of 35W LED lamp, 0.01mg/mL composite material can completely inactivate 50mL of harmful bacteria such as Escherichia coli or Staphylococcus aureus with a concentration of 105CFU/mL within 20min.

Scope of application and market prospects

It is mainly used for the surface antibacterial of materials, especially as an antibacterial coating for various fabrics, films and yarn nets.

At present, various viruses and harmful bacteria have caused great harm to human life and even survival, such as the current novel coronavirus epidemic, bird flu and swine flu encountered by the aquaculture industry. By coating the photocatalytic antibacterial material on cloth, film, gauze, etc., the preparation of masks, clothing, window screens or plastic films with antibacterial and antiviral properties will have broad market prospects. The composite material of this project has good performance both in the sunlight and under the irradiation of indoor LED lights.

Investment estimates

1, Production raw materials: 1 million

2. R&D team building: 1 million

3. Laboratory and production line construction: 2.5 million

5. Analytical instruments and related expenses: 500,000

6, Product testing and registration: 500,000

Total: 5.5 million

Means of cooperation

Interview.