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A kind of g-c3n4/tio2/ac composite photocatalyst and its preparation method and application

A technology of g-c3n4 and compound light, which is applied in illumination water/sewage treatment, energy and wastewater treatment, etc., can solve the problems of ineffective use of sunlight, high exciton binding energy, small specific surface area, etc., and achieves great application value, Simple preparation process and high photocatalytic activity

Inactive Publication Date: 2016-06-29
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, g-C 3 N 4 There are still some problems with polymers as photocatalysts, such as small specific surface area, high exciton binding energy for generating photogenerated carriers, low quantum efficiency and large forbidden band width ( lambda <460nm) and cannot effectively use sunlight, etc.

Method used

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  • A kind of g-c3n4/tio2/ac composite photocatalyst and its preparation method and application
  • A kind of g-c3n4/tio2/ac composite photocatalyst and its preparation method and application
  • A kind of g-c3n4/tio2/ac composite photocatalyst and its preparation method and application

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Embodiment 1

[0017] a g-C 3 N 4 / TiO 2 The preparation method of / AC composite photocatalyst comprises the following steps:

[0018] 1) Boil and clean the powdered activated carbon with 0.1mol / L nitric acid solution, then wash with distilled water until neutral, and dry to constant weight;

[0019] 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 3 g of melamine and react for 120 minutes. Afterwards, stop stirring, place at room temperature for 48 hours, vacuum-dry at 75°C to constant weight, and grind;

[0020] 3) Under the protection of high-purity nitrogen, raise the temperature of the ground sample to 180°C at 10°C / min. Raise the temperature to 500°C, keep it warm for 2 hours, and cool down to room temperature naturally to obtain the g-C 3 N 4 / TiO 2 / AC composite photocatalyst.

[0021] prepared g-C 3 N 4 / T...

Embodiment 2

[0027] a g-C 3 N 4 / TiO 2 The preparation method of / AC composite photocatalyst comprises the following steps:

[0028] 1) Boil and clean the powdered activated carbon with 0.1mol / L nitric acid solution, then wash with distilled water until neutral, and dry to constant weight;

[0029] 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 5 g of melamine and react for 120 minutes. Afterwards, stop stirring, place at room temperature for 48 hours, vacuum dry at 80°C to constant weight, and grind;

[0030]3) Under the protection of high-purity nitrogen, raise the temperature of the ground sample to 180°C at 10°C / min, keep the temperature for 60 minutes, then raise the temperature to 480°C at a rate of 2°C / min, keep it for 2 hours, and then heat it at 1°C / min Raise the temperature to 550°C, keep it warm for 2 hour...

Embodiment 3

[0033] a g-C 3 N 4 / TiO 2 The preparation method of / AC composite photocatalyst comprises the following steps:

[0034] 1) Boil and clean the powdered activated carbon with 0.1mol / L nitric acid solution, then wash with distilled water until neutral, and dry to constant weight;

[0035] 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 4 g of melamine and react for 120 minutes. Afterwards, stop stirring, place at room temperature for 48 hours, vacuum dry at 78°C to constant weight, and grind;

[0036] 3) Under the protection of high-purity nitrogen, raise the temperature of the ground sample to 180°C at 10°C / min, keep the temperature for 60 minutes, then raise the temperature to 480°C at a rate of 1.5°C / min, keep it for 2 hours, and then heat it at 1°C / min Raise the temperature to 520°C, keep it warm for 2 h...

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Abstract

The invention discloses a g-C3N4 / TiO2 / AC composite photocatalyst and its preparation method and application. The g-C3N4 / TiO2 / AC composite photocatalyst. The catalyst has high photocatalytic activity in the ultraviolet light region and visible light region, is not easy to deactivate, has a long service life, maintains high activity in a wide pH range, has a simple preparation process, and has great potential application value.

Description

technical field [0001] The invention belongs to the field of preparation of catalysts, in particular to a g-C 3 N 4 / TiO 2 / AC composite photocatalyst 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 ​​10m 2 / g, in lambda Under the induction of >387nm visible light, it can catalyze redox reactions. Compared wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30
CPCY02W10/37
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