Preparation method of efficient photolysis formaldehyde heterojunction

By mixing melamine, 2% fluorine-doped metatitanic acid and trap collecting agent at a specific mass ratio and insulated at high temperature to obtain heterojunction, the problem of insufficient application of TiO2 in the field of photocatalytic degradation is solved, and a high-efficiency heterojunction preparation of photolysis of formaldehyde is achieved, with good application prospects.

CN119926516APending Publication Date: 2025-05-06SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Patent Information

Application Number
CN202510001183.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-02
Publication Date
2025-05-06

AI Technical Summary

Technical Problem

The application of TiO2 in the field of photocatalytic degradation is limited by its narrow light absorption range, easy recombination of photogenerated carriers and difficult recycling.

Method used

After mixing melamine, 2% fluorine-doped metatitanic acid and trap collecting agent in a specific mass ratio, a heterojunction with high efficiency photolysis of formaldehyde was prepared by insulating it in the range of 545-560°C for 2 hours.

Benefits of technology

It has achieved high-efficiency photolysis heterojunction preparation, which has good application prospects, simple production process, and efficient preparation of photolysis heterojunction, which has good application prospects.

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Abstract

The invention relates to a photocatalytic method, in particular to a preparation method of a heterojunction with efficient photolysis of formaldehyde, which comprises the following steps: fully and uniformly mixing melamine, metatitanic acid doped with 2% of fluorine and a trapping agent according to the mass ratio of (2-5): 1: (1-3), and keeping the temperature within the range of 545-560 DEG C for 2 hours to prepare the heterojunction with efficient photolysis of formaldehyde. The trapping agent is a KG550 type trapping agent or a DB700 type trapping agent. The preparation method has the advantages that the production process is simple, the photolysis formaldehyde heterojunction is efficiently prepared, and the application prospect is good.
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Description

Technical Field

[0001] The invention relates to a photocatalytic method, in particular to a preparation method of a heterojunction with high-efficiency photolysis of formaldehyde. Background Art

[0002] Photocatalytic technology is an advanced technology that uses photon energy through catalysts to convert many chemical reactions that need to occur under harsh conditions into reactions that occur under mild conditions. It is a green technology with important application prospects in the fields of energy and environment. As early as the 1930s, researchers discovered that TiO2 has a bleaching effect on dyes and a degradation effect on fiber-like organic matter in the presence of oxygen and under ultraviolet light, and confirmed that TiO2 does not change before and after the reaction. In 1972, Fujishima Akira, a famous Japanese photochemical scientist, discovered that the surface of TiO2 single crystals can promote the decomposition of water to produce hydrogen under ultraviolet light. His results, the "Honda-Fujishima Effect", were published in Nature magazine, opening a new chapter in the research of photocatalytic technology. The application of photocatalytic technology in environmental protection, air purification and environmental pollution control has been brilliant, causing a new revolution in environmental protection technology, making this method of converting solar energy into chemical energy quickly become an extremely attractive research direction. World-renowned scientists have invested in research in this field, making it one of the research hotspots in the field of cutting-edge science and technology.

[0003] TiO2 has attracted much attention due to its stable chemical properties, no pollution, and resistance to light corrosion. However, it still has shortcomings such as narrow light absorption range, easy recombination of photogenerated carriers, and difficulty in recycling, which seriously limit the practical application of TiO2 in the field of photocatalytic degradation. Summary of the invention

[0004] The object of the present invention is to provide a preparation method of a heterojunction with high-efficiency photolysis of formaldehyde. The method comprises the following steps: fully and uniformly mixing melamine, metatitanic acid doped with 2% fluorine and a collecting agent in a mass ratio of 2-5:1:1-3, and then heat-preserving the mixture at 545-560° C. for 2 hours to obtain a heterojunction with high-efficiency photolysis of formaldehyde. The heterojunction with high-efficiency photolysis of formaldehyde is prepared, and has good application prospects.

[0005] The objective of the present invention is achieved through the following technical solutions: A method for preparing a highly efficient photodegradation formaldehyde heterojunction comprises the following steps: fully and uniformly mixing melamine, 2% fluorine-doped titanic acid and a collector in a mass ratio of 2-5:1:1-3, and then heat-preserving the mixture at 545-560°C for 2h to obtain a highly efficient photodegradation formaldehyde heterojunction.

[0006] The method for preparing a heterojunction with high-efficiency photolysis of formaldehyde comprises a KG550 type or a DB700 type collector.

[0007] The advantages and effects of the present invention are: The invention prepares a photolytic formaldehyde heterojunction by fully and uniformly mixing melamine, 2% fluorine-doped titanic acid and a collecting agent in a mass ratio of 2-5:1:1-3, and heat-preserving the mixture at 545-560° C. for 2 hours to obtain a photolytic formaldehyde heterojunction. The invention has a simple production process, can efficiently prepare a photolytic formaldehyde heterojunction, and has good application prospects. DETAILED DESCRIPTION

[0008] Example 1 After melamine: 2% fluorometitanic acid: KG550 collector was fully mixed in a mass ratio of 2:1:1, and then kept at 545℃ for 2h to obtain a highly efficient photodegradation formaldehyde heterojunction. The test results show that the prepared heterojunction has a formaldehyde degradation rate of 92.3% within 48h under visible light conditions for an initial concentration of 10ppm of formaldehyde.

[0009] Example 2 After melamine: 2% fluorine-doped titanic acid: DB700 collector was fully mixed in a mass ratio of 5:1:3, the mixture was kept at 560℃ for 2h to obtain a highly efficient photodegradation formaldehyde heterojunction. The test results showed that the prepared heterojunction had a formaldehyde degradation rate of 98.7% within 48h under visible light conditions for an initial concentration of 10ppm of formaldehyde.

[0010] Example 3 After melamine: 2% fluorine-doped metatitanic acid: KG550 collector was fully mixed in a mass ratio of 5:1:2, the mixture was kept at 550℃ for 2h to obtain a highly efficient photodegradation formaldehyde heterojunction. The test results show that the prepared heterojunction has a formaldehyde degradation rate of 98.3% within 24h under visible light conditions for an initial concentration of 10ppm of formaldehyde.

Claims

1. A method for preparing a heterojunction having high efficiency in photolysis of formaldehyde, characterized in that: The method comprises the following steps: fully and uniformly mixing melamine, 2% fluorine-doped titanic acid and a collector in a mass ratio of 2-5:1:1-3, and then heat-preserving the mixture at 545-560° C. for 2 hours to obtain a heterojunction with high efficiency in photolysis of formaldehyde.

2. The method for preparing a heterojunction having high efficiency in photolysis of formaldehyde according to claim 1, characterized in that: The collecting agent is KG550 type or DB700 type.