Application of Semiconductor Composite Materials Modified by Fullerene Derivatives in Photocatalytic Degradation of Formaldehyde

A technology of fullerene derivatives and composite materials, applied in photocatalytic degradation of formaldehyde, in the field of semiconductor composite materials, can solve the problem of high recombination rate of photogenerated carriers, few semiconductor composite materials, rare and expensive precious metals, etc. question

Active Publication Date: 2020-12-29
INST OF CHEM CHINESE ACAD OF SCI +1
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Problems solved by technology

[0004] 1. Activated carbon absorbs formaldehyde gas. Activated carbon has a certain adsorption capacity for formaldehyde, but when the adsorption capacity is saturated, activated carbon not only cannot absorb additional formaldehyde, but the previously adsorbed formaldehyde may also be released again
[0005] 2. Nano-scale titanium dioxide (photocatalyst) degrades formaldehyde. Under the irradiation of ultraviolet light, it will produce photocatalysis and can degrade formaldehyde. However, there are some key constraints in its application. First, the utilization rate of solar energy is low. Its light absorption wavelength is mainly concentrated in the ultraviolet region (λ3 , the degradation rate of low-concentration pollutants is slow; the third is that due to the high recombination rate of photogenerated carriers, the quantum efficiency is low, and it is difficult to treat large quantities and high concentrations of wastewater and waste gas
[0006] 3. Titanium dioxide physically adsorbs pigments or dyes as a photocatalyst to degrade formaldehyde, but the way titanium dioxide loads pigments or dyes in this material is usually physical adsorption, so it is not stable enough. If it is used many times, the pigments or dyes loaded on titanium dioxide will be detached , so that the remaining titanium dioxide has a low utilization rate of sunlight
[0007] 4. A photocatalyst that combines titanium dioxide with a surface photosensitizer can degrade formaldehyde. Surface photosensitization can expand the absorption wavelength range of titanium dioxide and improve the utilization efficiency of visible light. The continuous consumption due to the adsorption competition among them limits the development of photosensitization, and further research is needed.
[0008] 5. The application of the composite of titanium dioxide and precious metals in photocatalytic formaldehyde, but because the precious metals are rare and expensive, the cost of the catalyst is high, and the coating technology of the powder catalyst is difficult, and there are still falling off during the preparation of the integral catalytic module. problems, there are certain obstacles in the practical application of this technology
[0009] 6. Change the energy level structure of titanium dioxide as a photocatalyst by doping to expand its spectral absorption range, but the doping of titanium dioxide can easily cause lattice defects in titanium dioxide, resulting in changes in the unit cell constant, thereby affecting the stability of the catalyst. In addition, the research on the doping modification of titanium dioxide is blind, and the mechanism of doping needs to be further studied.
[0012] However, the application of semiconductor composite materials modified by fullerene derivatives in the treatment of formaldehyde pollution is still very little

Method used

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  • Application of Semiconductor Composite Materials Modified by Fullerene Derivatives in Photocatalytic Degradation of Formaldehyde
  • Application of Semiconductor Composite Materials Modified by Fullerene Derivatives in Photocatalytic Degradation of Formaldehyde
  • Application of Semiconductor Composite Materials Modified by Fullerene Derivatives in Photocatalytic Degradation of Formaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0062]Example 1-1 C60Carboxyl derivative modified TiO2Composite material C60(C(COOH)2)n / TiO2Preparation

[0063]Flake TiO2Preparation: Mix 0.07 mol of tetrabutyl titanate and 5ml (40wt%) of hydrofluoric acid to control pH to obtain a mixed solution. The mixed solution is placed in a 100ml reactor and kept at 200°C for 20 hours. After the reaction, the temperature is lowered to obtain a flake The solution of titanium dioxide was filtered by centrifugation, washed with deionized water 3 times, and then washed 3 times with absolute ethanol, and dried overnight in an oven at 80° C. to obtain 0.068 mol of flake titanium dioxide solid powder.

[0064]Granular TiO2Preparation: Mix 17.5ml of ethanol and 35ml of water with ultrasonic for 15min to obtain a mixed solution, then add 3.4ml of tetrabutyl phthalate to another 17.5ml of ethanol, and then add the tetrabutyl titanate ethanol solution dropwise under stirring Into the above mixed solution, continue to stir for 2h, transfer the resulting susp...

Embodiment 1-2

[0074]Example 1-2 C60Amino derivative modified TiO2Composite material C60(EDA)n / TiO2Preparation

[0075]Flake TiO2Preparation method, particle TiO2The preparation method is the same as in Example 1-1.

[0076]C60Aminated derivative C60(EDA)nPreparation: Weigh 50mg of solid fullerene C with an analytical balance60Dissolve in 25ml of o-xylene solution, disperse ultrasonically for 30min, measure 50L of ethylenediamine into a 100ml conical flask with stopper, add a magnetic stirrer, stir for 24h with a magnetic stirrer (temperature: room temperature, speed: 1000r / min), using a solvent filter (volume: 1L, filter membrane pore size: 200nm) to suction filter the reactants to obtain a brown-red solution. The components of the solution are mainly ethylenediamine and C that have not participated in the reaction60(EDA)nAnd the solvent o-xylene. The obtained solution was put into a 250 ml round bottom flask, and then the filtrate was dried by rotary evaporation using a rotary evaporator (temperature...

Embodiment 1-3

[0082]Example 1-3 C60Hydroxylated derivative C60(OH)n / TiO2Modified TiO2Preparation of composite materials

[0083]Flake TiO2Preparation method, particle TiO2The preparation method is the same as in Example 1-1.

[0084]C60Hydroxylated derivative C60(OH)nPreparation: 100 mg C60Add 20ml o-xylene to dissolve ultrasonically, add potassium hydroxide solution (4g potassium hydroxide+4ml water) dropwise under stirring at 40°, add 200μl tetrabutylammonium hydroxide aqueous solution, react for 24 hours, reduce pressure at 40° Rotate and evaporate o-xylene, add 4 ml of water and continue to react at 40 degrees for 24 hours, add 10 times anhydrous ethanol and let stand for 10 minutes, centrifuge, dissolve a small amount of water and then add anhydrous ethanol, centrifuge, the same method twice, precipitation After dissolving 50 ml of water ultrasonically, pass it through a 0.22 micron filter membrane, dialyze for two to three days, until the conductivity is close to that of pure water, and evaporate...

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Abstract

The invention relates to the field of photocatalysis, further to an application of a fullerene derivative modified semiconductor composite material in photocatalytic degradation of formaldehyde. The fullerene derivative comprises at least one of fullerene aminated derivative, a fullerene carboxylated derivative and a fullerene hydroxylated derivate. A semiconductor body of the composite material comprises at least one of bismuth tungstate, titanium dioxide, bismuth vanadate, zinc oxide and stannic oxide. The composite material is stable in structure in a process of photocatalytic degradation of formaldehyde, can be used repeatedly, is excellent in formaldehyde degrading performance and low in cost, and is free of secondary pollution.

Description

Technical field[0001]The invention relates to the field of photocatalysis, and further relates to the application of a fullerene derivative-modified semiconductor composite material in the photocatalytic degradation of formaldehyde.Background technique[0002]With the improvement of people's living standards, the decoration of houses and rooms is increasing, and the organic gases such as formaldehyde, benzene, ammonia and other materials released from the coatings, paints, foam fillers and other materials used in these decorations have caused serious indoor air pollution. , Can cause great harm to human body. Among these, the most common is formaldehyde pollution, which often exceeds the standard. Formaldehyde is recognized as a potential carcinogen in the world, and low concentrations of formaldehyde can cause chronic respiratory diseases, leukemia, and asthma. Therefore, the effective removal of formaldehyde and other harmful gases has become an important part of today's environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/04B01J27/24B82Y30/00B82Y40/00B01D53/86B01D53/72
Inventor 王春儒吴波刘丽萍
Owner INST OF CHEM CHINESE ACAD OF SCI
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