Carbon nitrogen co-doped nano titanium dioxide-polyvinyl alcohol composite film with visible-light activity and preparation method and application thereof

A nano-titanium dioxide, polyvinyl alcohol technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, special compound water treatment, etc. The effect of small forbidden band width and simple and easy preparation process

Inactive Publication Date: 2019-09-27
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, powdered TiO 2 Although it has high photocatalytic activity, it also brings troubles for subsequent collection and processing

Method used

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  • Carbon nitrogen co-doped nano titanium dioxide-polyvinyl alcohol composite film with visible-light activity and preparation method and application thereof
  • Carbon nitrogen co-doped nano titanium dioxide-polyvinyl alcohol composite film with visible-light activity and preparation method and application thereof
  • Carbon nitrogen co-doped nano titanium dioxide-polyvinyl alcohol composite film with visible-light activity and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] A method for preparing a carbon-nitrogen co-doped nano-titanium dioxide-polyvinyl alcohol composite film with visible light activity, comprising the following steps:

[0036]1) After uniformly mixing Tween 80, isopropyl titanate, concentrated nitric acid and isopropanol according to the mass ratio of 6:1:1:12, let it stand and age at room temperature for 2 days, and then put the aged The mixed solution is dried to remove the solvent to obtain a xerogel;

[0037] 2) The xerogel obtained in step 1) was calcined and activated at 420°C for 1 hour, then cooled naturally to room temperature, and the calcined and activated product was washed with water and ethanol in sequence, dried, and then ground into uniform nano-sized particles. Carbon and nitrogen co-doped nano-titanium dioxide powder (marked as CN-Ti 2 O);

[0038] 3) Add the carbon-nitrogen co-doped nano-titanium dioxide powder obtained in step 2) into water, ultrasonically disperse to form a uniform suspension with ...

Embodiment 2

[0049] A method for preparing a carbon-nitrogen co-doped nano-titanium dioxide-polyvinyl alcohol composite film with visible light activity, comprising the following steps:

[0050] 1) After uniformly mixing Tween 60, isopropyl titanate, concentrated nitric acid and isopropanol according to the mass ratio of 4.5:1:0.1:5.5, let it stand and age at room temperature for 1 day, and then the aged The mixed solution is dried to remove the solvent to obtain a xerogel;

[0051] 2) The dry gel obtained in step 1) was calcined and activated at 390°C for 5 hours, then cooled naturally to room temperature, and the calcined and activated product was washed with water and ethanol in sequence, dried, and then ground into uniform nano-sized particles. Carbon-nitrogen co-doped nano-titanium dioxide powder is obtained;

[0052] 3) Add the carbon-nitrogen co-doped nano-titanium dioxide powder obtained in step 2) into water, ultrasonically disperse to form a uniform suspension with a concentrati...

Embodiment 3

[0055] A method for preparing a carbon-nitrogen co-doped nano-titanium dioxide-polyvinyl alcohol composite film with visible light activity, comprising the following steps:

[0056] 1) After uniformly mixing Tween 40, isopropyl titanate, concentrated nitric acid and isopropanol according to the mass ratio of 0.6:1:0.1:3.8, let it stand and age at room temperature for 3 days, and then the aged The mixed solution is dried to remove the solvent to obtain a xerogel;

[0057] 2) The xerogel obtained in step 1) was calcined and activated at 400°C for 0.5 hours, then naturally cooled to room temperature, the calcined and activated product was washed with water and ethanol in sequence, dried, and then ground into uniform nano-sized particles, Carbon-nitrogen co-doped nano-titanium dioxide powder is obtained;

[0058] 3) Add the carbon-nitrogen co-doped nano-titanium dioxide powder obtained in step 2) into water, ultrasonically disperse to form a uniform suspension with a concentratio...

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Abstract

The invention discloses a carbon nitrogen co-doped nano titanium dioxide-polyvinyl alcohol composite film with visible-light activity and a preparation method and application thereof. The preparation method comprises the following processes: mixing a structure-directing agent, a titanium source, a nitrogen source and an alcohol solvent uniformly, then standing and aging for 1 day or above at room temperature, drying, calcining and activating xerogel formed by drying at the temperature of 380-500 DEG C for 0.5-8 h, cooling, washing, drying, then grinding into uniform nano-scale particle matters, mixing the nano-scale particle matters formed by grinding, water and polyvinyl alcoholand stirring uniformly, pouring stirred mixed liquid into a mold under the condition of room temperature and naturally drying, and then performing heat treatment to obtain the carbon nitrogen co-doped nano titanium dioxide-polyvinyl alcohol composite film. It is indicated by photocatalytic test results that under visible light, the carbon nitrogen co-doped nano titanium dioxide-polyvinyl alcohol composite film disclosed by the invention can catalytically degrade organic pollutants such as phenol efficiently, and can be applied to water treatment.

Description

technical field [0001] The invention belongs to the technical field of nano-titanium dioxide photocatalysis, and specifically relates to a carbon-nitrogen co-doped nano-titanium dioxide-polyvinyl alcohol composite film with visible light activity and a preparation method and application thereof. Background technique [0002] Due to its low toxicity, stability and cheap characteristics, titanium dioxide (TiO 2 ) has been widely used in the field of materials, especially in the field of photocatalytic materials. Many studies have shown that TiO 2 It can be used for photocatalytic degradation of organic pollutants in water and atmosphere. Ordinary TiO 2 Due to its large band gap (anatase is about 3.2eV), it can only use the light energy in the ultraviolet band, which greatly limits its utilization efficiency of solar light energy. Therefore, the preparation of titanium dioxide photocatalysts with visible light activity has become a A research hotspot, including the use of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C02F1/30C02F101/34
CPCB01J31/38B01J35/004C02F1/30C02F2101/345C02F2305/10
Inventor 张歌珊鲁意炜闫亮
Owner ZHEJIANG UNIV OF TECH
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