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Method for preparing broadband spectrum response photo-catalytic film

A photocatalytic film, wide spectrum technology, applied in the fields of chemical industry and polymer functional materials, can solve the problem of low light quantum efficiency, and achieve the effect of improving environmental friendliness, high catalytic efficiency, and good photocatalytic effect

Inactive Publication Date: 2017-12-12
江苏科来材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the forbidden band width of titanium dioxide reaches 3.2eV, it only responds to ultraviolet light with an incident wavelength lower than 387nm, and the utilization of sunlight only accounts for 3-5%. not tall

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  • Method for preparing broadband spectrum response photo-catalytic film
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  • Method for preparing broadband spectrum response photo-catalytic film

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preparation example Construction

[0049] A preparation method of a photocatalytic film with broad spectral response, the preparation method comprising the following steps:

[0050] 1) Prepare the polymer matrix solution: activate the polymer matrix, then dissolve the polymer matrix in a solvent to obtain a polymer matrix solution; the polymer matrix is ​​selected from cellulose, lignin, hemicellulose, chitosan , chitin, polyvinyl alcohol or isopropanol / water solution;

[0051] 2) Preparation of broad-spectrum response titanium dioxide photocatalyst by supercritical hydrothermal method: react dihydroxybis(ammonium lactate)titanium(IV) solution and nickel nitrate solution with supercritical water to prepare Ni ion-doped modified Titanium dioxide photocatalyst;

[0052] 3) Preparation of wide-spectrum responsive photocatalytic membrane by electrospinning: the aqueous solution of Ni ion-doped modified titanium dioxide photocatalyst obtained in step 2) is used as an impregnating solution, and the polymer matrix so...

Embodiment 1

[0069] A preparation method of titanium dioxide / cellulose composite membrane with broad spectral response (based on cellulose)

[0070] (1) Preparation of cellulose solution

[0071] Firstly, cellulose fibers such as cotton, wood pulp, and bamboo pulp were activated, that is, cellulose fibers such as cotton, wood pulp, and bamboo pulp were soaked in water, methanol, and dimethylacetamide (DMAc) for 1 hour in sequence. Suction filtration is performed to remove the soaking solvent remaining in the cellulose, and finally the activated cellulose is dissolved in a solvent system whose DMAc / LiCl ratio is 92:8;

[0072] (2) Preparation of TiO2 Photocatalyst with Broad Spectrum Response by Supercritical Hydrothermal Method

[0073] a. Heat the deionized water to a temperature of 400-500°C and a pressure of 22-25Mpa. In this state, the water will enter a supercritical state;

[0074] b. Prepare 0.05-0.15M dihydroxybis(ammonium lactate)titanium(IV) and 0.0005-0.002M nickel nitrate mix...

Embodiment 2

[0086] Preparation method based on lignin

[0087] (1) Preparation of lignin solution

[0088] First, activate the lignin, soak the lignin in water, methanol, and dimethylacetamide (DMAc) for 1.5 hours in sequence, each soaking is accompanied by suction filtration to remove the soaking solvent in the lignin, and finally the activated lignin It was dissolved in a solvent system with a DMAc / LiCl ratio of 92:8.

[0089] (2) Preparation of TiO2 Photocatalyst with Broad Spectrum Response by Supercritical Hydrothermal Method

[0090] f. Heat the deionized water to a temperature of 400-500°C and a pressure of 22-25Mpa. In this state, the water will enter a supercritical state;

[0091] g. prepare 0.05M dihydroxy bis(ammonium lactate) titanium (IV) and 0.0005M nickel nitrate mixed salt solution;

[0092] h. Pump the deionized water in a and the mixed salt solution in b into the hydrothermal kettle for reaction through a high-pressure pump, and keep the temperature of the hydrotherm...

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Abstract

The invention provides a method for preparing a broadband spectrum response photo-catalytic film. The preparation method comprises the following steps: preparing a polymer matrix solution; preparing a broadband spectrum response titania photocatalyst through a supercritical hydrothermal method, and preparing the broadband spectrum response photo-catalytic film through electrostatic spinning. The photo-catalytic film prepared by the invention has the advantages of high porosity and high specific area, has a specific surface area reaching 300m<2> / g or higher, and has a special structure with micro-pore and mesoporous coexistence, so that the titania nanoparticles are uniformly dispersed and loaded on a polymer matrix non-woven fabric. The photo-catalytic film prepared by the invention has filtering and purifying functions, is capable of filtering the nano-scale particles, greatly adsorbing formaldehyde, VOC (Volatile Organic Compounds) and other pollutants and efficiently performing catalytic degradation on the formaldehyde, VOCs and the other pollutants to produce CO2 and water under sunshine conditions, and achieves dual effects of catalytic degradation and filtration.

Description

technical field [0001] The invention relates to the technical field of chemical engineering and polymer functional materials, in particular to a preparation method of a wide-spectrum response photocatalytic film. Background technique [0002] With the acceleration of industrialization, environmental and energy problems are becoming more and more serious. Air pollution, water pollution, interior decoration pollution, vehicle pollution, etc. all threaten human health. In recent years, photocatalytic technology has developed rapidly and is widely used in the fields of air and water purification, sterilization and disinfection. It has mild reaction conditions, low cost, can use solar energy as the driving force, and has no secondary pollution. A method that can alleviate energy shortage and effectively prevent and control environmental pollution. [0003] As the most common photocatalyst, nano-titanium dioxide has the advantages of stable properties, economical, green and non-...

Claims

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Application Information

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IPC IPC(8): B01J31/38B01D53/86B01D53/72B01D53/44
CPCB01D53/8668B01D53/8687B01J31/38B01D2255/802B01D2257/708B01J35/59B01J35/39
Inventor 朱英明时宝陆森荣
Owner 江苏科来材料科技有限公司
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