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Ag/g-C3N4/TiO2/AC catalyst as well as preparation method and application of catalyst

A g-c3n4, catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of ineffective use of sunlight, high exciton binding energy, and large forbidden band width, etc. It is beneficial to industrialization and application, the preparation process is simple, and the effect of activity is small.

Inactive Publication Date: 2015-03-04
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]However, g-C3N4 polymers still have some problems as photocatalysts, such as small specific surface area, The exciton binding energy of photogenerated carriers is high, the quantum efficiency is low, and the band gap is too large (λ<460 nm), so it cannot effectively use sunlight, etc.

Method used

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  • Ag/g-C3N4/TiO2/AC catalyst as well as preparation method and application of catalyst
  • Ag/g-C3N4/TiO2/AC catalyst as well as preparation method and application of catalyst
  • Ag/g-C3N4/TiO2/AC catalyst as well as preparation method and application of catalyst

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Experimental program
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Embodiment 1

[0018] A preparation of Ag / g-C 3 N 4 / TiO 2 The method of / AC catalyst comprises the following steps:

[0019] 1) The powdered activated carbon was boiled and cleaned with 0.1mol / L nitric acid solution, then washed with distilled water until neutral, and dried to constant weight;

[0020] 2) Add the activated carbon in step 1) to the mixture of tetrabutyl titanate, acetic acid and absolute ethanol, and slowly add 85wt.% ethanol solution dropwise under magnetic stirring. After reacting for 60 minutes, add 3g of melamine and react for 120 minutes Afterwards, stop stirring, place at room temperature for 48 h, vacuum-dry at 75°C to constant weight, and grind;

[0021] 3) Under the protection of high-purity nitrogen, raise the temperature of the ground sample to 180°C at 10°C / min. The temperature was raised to 500°C at a certain rate, kept for 2 hours, and naturally cooled to room temperature;

[0022] 4) Take 2g of the sample in step 3), add 50mL 0.05mol / LAgNO 3 Solution, re...

Embodiment 2

[0024] A preparation of Ag / g-C 3 N 4 / TiO 2 The method of / AC catalyst comprises the following steps:

[0025] 1) The powdery activated carbon is boiled and cleaned with 0.1mol / L nitric acid solution, then washed with distilled water until neutral, and dried to constant weight;

[0026] 2) Add the activated carbon in step 1) to the mixture of tetrabutyl titanate, acetic acid and absolute ethanol, and slowly add 85wt.% ethanol solution dropwise under magnetic stirring. After reacting for 60 minutes, add 5g of melamine and react for 120 minutes Afterwards, stop stirring, place at room temperature for 48 h, vacuum-dry at 80°C to constant weight, and grind;

[0027] 3) Under the protection of high-purity nitrogen, the temperature of the ground sample was raised to 180°C at 10°C / min, kept at a constant temperature for 1 hour, then raised to 480°C at a rate of 2°C / min, kept for 2 hours, and then heated at 1°C / min The temperature was raised to 550°C at a certain rate, kept for 2 ...

Embodiment 3

[0030] A preparation of Ag / g-C 3 N 4 / TiO 2 The method of / AC catalyst comprises the following steps:

[0031] 1) The powdered activated carbon was boiled and cleaned with 0.1mol / L nitric acid solution, then washed with distilled water until neutral, and dried to constant weight;

[0032] 2) Add the activated carbon in step 1) to the mixture of tetrabutyl titanate, acetic acid and absolute ethanol, and slowly add 85wt.% ethanol solution dropwise under magnetic stirring. After reacting for 60 minutes, add 4g of melamine and react for 120 minutes Afterwards, stop stirring, place at room temperature for 48 h, vacuum-dry at 78°C to constant weight, and grind;

[0033]3) Under the protection of high-purity nitrogen, raise the temperature of the ground sample to 180°C at 10°C / min. The temperature was raised to 520°C at a certain rate, kept for 2 hours, and naturally cooled to room temperature;

[0034] 4) Take 2g of the sample in step 3), add 50mL 0.06mol / LAgNO 3 Solution, aft...

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Abstract

The invention discloses an Ag / g-C3N4 / TiO2 / AC catalyst as well as a preparation method and application of the catalyst. The Ag / g-C3N4 / TiO2 / AC catalyst is prepared by adopting tetrabutyl titanate, melamine, activated carbon, silver nitrate and the like as main raw materials in a way of controlling the hydrolysis reaction, polycondensation reaction and photochemical reaction. The catalyst is not only wide in spectral response, but also has a thermocatalytic function, and has a good effect on degrading of volatile organic pollution gases; moreover, the humidity of the gas has slight impact on the activity. The Ag / g-C3N4 / TiO2 / AC catalyst has a specific advantage of degrading damp and hot organic pollution gases released from factory lines.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, in particular to an Ag / g-C 3 N 4 / TiO 2 / AC catalyst and its preparation method and application. Background technique [0002] In 2009, Chinese scientists cooperated with German and Japanese scientists to discover a conjugated polymer graphite phase carbon nitride (g-C 3 N 4 ) visible light photocatalytic materials, and using density functional theory (DFT) and electrochemical methods to study the energy band structure of carbon nitride, found that g-C 3 N 4 With a typical semiconductor band structure, sp 2 Hybridized N 2 p orbital composition g-C 3 N 4 The highest occupied molecular orbital (HOMO) of the C 2 p The hybrid orbital constitutes its lowest unoccupied molecular orbital (LUMO), with a band gap of about 2.7eV and a specific surface area of ​​10 m 2 / g, in lambda Under the induction of > 387 nm visible light, it can catalyze redox reactions. Compared with tradition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/72B01D53/70
Inventor 陈孝云陈星陆东芳常鼎伟高骁敏叶红华月钿
Owner FUJIAN AGRI & FORESTRY UNIV
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