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TiO2 photocatalyst doped with C and N for improving activity of visible light and preparation method of photocatalyst

A photocatalyst and co-doping technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of narrow visible light response range, pollution of photocatalyst preparation methods, harsh preparation conditions, etc. Achieve the effect of increasing absorption and response intensity, reducing energy consumption and low cost

Active Publication Date: 2019-05-21
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a C, N co-doped TiO with improved visible light activity 2 Photocatalyst and its preparation method, aiming to solve the problem of existing non-metal doped TiO 2 The photocatalyst preparation method is relatively polluted, the preparation conditions are relatively harsh, and the existing photocatalyst has a narrow visible light response range.

Method used

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  • TiO2 photocatalyst doped with C and N for improving activity of visible light and preparation method of photocatalyst
  • TiO2 photocatalyst doped with C and N for improving activity of visible light and preparation method of photocatalyst

Examples

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Effect test

Embodiment 1

[0027] Add 0.80g soybean protein isolate powder to the polytetrafluoroethylene lining of the reaction kettle, then add 50ml ethanol and 5ml distilled water, seal it and place it in a 160°C thermostat for 12 hours, cool to room temperature, and filter the residue to obtain a brownish red color water / alcoholysis reaction solution; take 3ml of the above-mentioned brown-red water / alcoholysis reaction solution and add it to 12ml ethanol to obtain 15ml diluted water / alcoholysis reaction solution; take 25m ethanol at room temperature, and slowly add 8ml titanic acid while stirring Add 18ml of dilute water / alcoholysis solution reaction solution drop by drop after butyl ester, fully stir the reaction for 2h to obtain a light yellow sol, then slowly add 40ml of water / alcoholysis solution reaction solution, stir and age for 4h; add 100ml of water In a thermal reaction kettle, seal it and react in a constant temperature box at 200°C for 24 hours; cool to room temperature, centrifuge to obt...

Embodiment 2

[0033] Add 1.0g soybean protein isolate powder to the polytetrafluoroethylene lining of the reaction kettle, then add 60ml ethanol and 10ml distilled water, seal it and place it in a 160°C thermostat for 24 hours, cool to room temperature, and filter the residue to obtain a brownish red color Take 2ml of the above-mentioned brown-red liquid and add it to 10ml ethanol to obtain 12ml diluted water / alcoholysis solution reaction solution; take 15m ethanol at room temperature, slowly add 5ml butyl titanate while stirring, and then gradually Add 12ml of diluted water / alcoholysis solution reaction solution dropwise, fully stir the reaction for 2h to obtain a light yellow sol, then slowly add 50ml of water / alcoholysis solution reaction solution, stir and age for 8h; put it into a 100ml hydrothermal reaction kettle, After sealing, react in a constant temperature box at 220°C for 24 hours; cool to room temperature, and centrifuge to obtain light yellow solid powder, wash with ethanol and...

Embodiment 3

[0038] Add 1.2g soybean protein isolate powder to the polytetrafluoroethylene lining of the reaction kettle, then add 50ml ethanol and 10ml distilled water, seal it and place it in a 180°C thermostat for 24 hours, cool to room temperature, and filter the residue to obtain a brownish red color Take 1ml of the above-mentioned brown-red liquid and add it to 10ml ethanol to obtain 11ml diluted water / alcoholysis solution reaction solution; take 15m ethanol at room temperature, slowly add 5ml butyl titanate while stirring, and then gradually Add 11ml of diluted water / alcoholysis solution reaction solution dropwise, fully stir the reaction for 2h to obtain a light yellow sol, then slowly add 50ml of water / alcoholysis solution reaction solution, stir and age for 12h; put it into a 100ml hydrothermal reaction kettle, After sealing, react in a constant temperature box at 180°C for 24 hours; cool to room temperature, centrifuge to obtain a golden yellow solid powder, wash with ethanol and...

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Abstract

The invention discloses a TiO2 photocatalyst doped with C and N for improving the activity of visible light and a preparation method of the photocatalyst. The method comprises the steps of firstly, preparing alcohol / hydrolysate of plant protein; secondly, dropwise adding the alcohol / hydrolysate of the plant protein into an ethanol solution of butyl titanate first; after the two components react with each other for a preset time, adding a preset amount of the alcohol / hydrolysate of the plant protein; after aging, performing a hydrothermal reaction to directly obtain the anatase TiO2 photocatalyst doped with C and N. According to the method, the cheap, natural and renewable plant protein is used as a carbon and nitrogen source, the preparation process is simple, calcination is not needed, and the anatase TiO2 synchronously doped with C and N is obtained through the one-time hydrothermal reaction. The absorption and response strength of TiO2 to visible light is enhanced through synchronous doping of C and N, the efficiency of separating photo-generated electrons from holes is improved, and the photocatalytic reaction under visible light is promoted.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a C and N co-doped TiO with improved visible light activity 2 Photocatalyst and its preparation method. Background technique [0002] TiO 2 (Titanium dioxide) has excellent characteristics such as non-toxicity, low cost, strong oxidation-reduction and stable chemical properties, and is currently the most widely used semiconductor photocatalytic material. TiO 2 Among the three crystal forms (anatase, rutile, and brookite), brookite has the worst photocatalytic performance, followed by rutile, and anatase has the best photocatalytic performance. However, anatase TiO 2 The forbidden bandwidth is 3.2eV, and only under the irradiation of light with a wavelength of ≤378.5nm (ultraviolet light), electronic transitions can occur to generate photogenerated electrons and holes, thereby showing photocatalytic activity, while ultraviolet light only accounts for 4~6% of the solar radiation e...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 王志奇吴晋沪何涛武景丽张金芝杨静
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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