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Nano photocatalyst of possessing function of molecular engram, preparation method and usage

A nano-photocatalyst, molecular imprinting technology, applied in separation methods, catalyst carriers, chemical instruments and methods, etc., can solve the problems of difficulty in obtaining high degradation efficiency, low product desorption rate, high migration or recombination rate, and achieve improved Indoor air quality, improved adsorption, obvious effect of economic benefits

Inactive Publication Date: 2008-09-03
ZHEJIANG UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But TiO 2 The photocatalysis has the following problems: low quantum efficiency (about 4%); high electron-hole pair generation, migration or recombination rate; reaction species adsorption on the catalyst surface, catalytic reaction, and product desorption from the catalyst surface low rate
However, due to the saturated adsorption phenomenon of activated carbon, carbon black and other adsorbents, it is difficult to obtain long-lasting high degradation efficiency.

Method used

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  • Nano photocatalyst of possessing function of molecular engram, preparation method and usage

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Experimental program
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Effect test

Embodiment 1

[0042] (1) Formaldehyde is selected as the template molecule, and activated carbon is the mesoporous material;

[0043] (2) Adsorb formaldehyde on activated carbon to saturation, forming a complex of activated carbon|formaldehyde;

[0044] (3) With n-butyl titanate as the sol precursor, ethanol as the solvent, and protonic acid as the inhibitor, the sol-gel method is adopted, and the molar ratio of n-butyl titanate, ethanol, water, and protonic acid is 1: Mix 20:3:15 to make TiO 2 gel;

[0045] (4) the prepared TiO 2 The gel was coated on the surface of the activated carbon|formaldehyde composite prepared in (2) according to the molar ratio of n-butyl titanate:activated carbon of 1:15 to form activated carbon|formaldehyde|TiO 2 The "sandwich" structure of the gel;

[0046] (5) The "sandwich" structure obtained in (4) was calcined at 600°C for 4 hours, crushed, and activated carbon and formaldehyde were removed by demolding to form a nano-photocatalyst with specific adsorpt...

Embodiment 2

[0049] According to the step of embodiment 1, take benzene as the template molecule, activated carbon as the mesoporous material to prepare the composite of activated carbon|benzene; take n-butyl titanate as the gel precursor, follow the steps of n-butyl titanate, ethanol, water, The molar ratio of protonic acid is 1:2:10:3 mixed to prepare TiO 2 Gel; according to the molar ratio of n-butyl titanate:activated carbon is 1:5 2 The gel is coated on the surface of the composite of activated carbon|benzene to form activated carbon|benzene|TiO 2 The "sandwich" structure of the gel is calcined at 350°C for 4 hours, and the activated carbon and benzene are removed by crushing and stripping to prepare a nano-photocatalyst with a specific adsorption and degradation function for benzene.

[0050] Taking formaldehyde and benzene as the target pollutants, the catalyst performance was evaluated in a continuous flow photocatalytic reaction system. The initial concentrations of formaldehyde...

Embodiment 3

[0052] According to the steps of Example 1, take toluene as template molecule and activated carbon as mesoporous material to prepare activated carbon|toluene compound; take n-butyl titanate as gel precursor, follow n-butyl titanate, ethanol, water, The molar ratio of protonic acid is 1:5:5:8 and mixed to obtain TiO 2 Gel; according to the molar ratio of n-butyl titanate:activated carbon is 1:2 2 The gel is coated on the surface of the composite of activated carbon|toluene to form activated carbon|toluene|TiO 2 The "sandwich" structure of the gel is calcined at 500 ° C for 4 hours, and the activated carbon and toluene are removed by crushing and defilming to prepare a nano-photocatalyst with specific adsorption and degradation functions for toluene.

[0053] Taking formaldehyde and toluene as the target pollutants, the catalyst performance was evaluated in a continuous flow photocatalytic reaction system. The initial concentrations of formaldehyde and toluene in the system ar...

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Abstract

A nano-photocatalyst with molecular engram function has a 3D pore structure matched fully with the space structure of the compounds in formaldehyde or benzene system and combined specifically with them. It can be used to improve indoor air by adsorbing and degradating said compounds. Its preparing process is also disclosed.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a nanometer photocatalyst with molecular imprinting function, a preparation method and the application of photocatalytic degradation of indoor volatile organic compounds. Background technique [0002] About 70% to 90% of people's life is spent indoors, and the indoor environment has a particularly important impact on people's health. Volatile organic compounds (VOCs) such as formaldehyde and benzene series (benzene, toluene, xylene) in indoor air are a class of organic pollutants that are ubiquitous in indoor air. It is known that many VOCs, especially formaldehyde and benzene series, which are ubiquitous in indoor air, have neurotoxicity, nephrotoxicity, hepatotoxicity and carcinogenicity, and can also damage blood components and cardiovascular system, cause gastrointestinal disorders, and seriously harm the human body. human health. The treatment of indoor air VOCs has become one of the int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J32/00B01D53/44B01D53/86
Inventor 赵伟荣吴忠标曹振娟
Owner ZHEJIANG UNIV
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