g-C3N4/TiO2@montmorillonite photocatalyst and preparation method thereof

A technology of g-c3n4, 1.g-c3n4 is applied in the field of montmorillonite composite g-C3N4/TiO2 heterojunction photocatalyst and its preparation, which can solve the problem of high requirements for reaction equipment, difficult recovery, easy agglomeration of catalysts, etc. problems, to achieve the effect of improving the utilization efficiency of visible light, reducing the application cost and being environmentally friendly

Inactive Publication Date: 2015-12-02
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

TiO 2 Due to its non-toxicity, good stability, and excellent catalytic ability, photocatalytic materials have always been a hot spot in research and development at home and abroad, but in the process of large-scale practical use, there are still the following problems: low quantum efficiency, photogenerated electron-hole polarity Easy to recombine; high band gap energy (Eg 锐钛型 =3.2eV), can only use ultraviolet light accounting for about 4% of sunlight; small specific surface area, poor adsorption capacity; small particle size, difficult to separate and recover
The ammonium fluoride used in the preparation process of this preparation method is a highly toxic substance, and the requirements for reaction equipment are relatively high, so there are certain potent

Method used

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  • g-C3N4/TiO2@montmorillonite photocatalyst and preparation method thereof
  • g-C3N4/TiO2@montmorillonite photocatalyst and preparation method thereof
  • g-C3N4/TiO2@montmorillonite photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The specific implementation steps are as follows:

[0019] (1) Take 10g montmorillonite and disperse it in 200mL water for 30min to prepare montmorillonite suspension; then dissolve 1.0CEC of cetyltrimethylammonium bromide in water, and then add modifier solution to montmorillonite Ion exchange was carried out in the stone suspension, stirred and reacted at 30°C for 3 hours, dried in an oven at 105°C, and ground until 97% passed through a 200-mesh sieve.

[0020] (2) Take 24mL of absolute ethanol, add 2.8g of dicyandiamide, stir for 30min to form a homogeneous suspension, then add 2.0g of modified montmorillonite, continue stirring for 30min, then add 2mL of glacial acetic acid dropwise, and then add 3mL of titanium acid tetrabutyl ester to obtain a reaction suspension; use concentrated hydrochloric acid to adjust the pH value to 2.0, and peptize at room temperature for 12 hours.

[0021] (3) Dry at 105°C for 12 hours, grind to 97% and pass through a 200-mesh sieve, an...

Embodiment 2

[0024] Same as step in embodiment 1, difference is: the add-on of modifier didodecyl dimethyl ammonium bromide is 0.6CEC in the step (1), and the temperature of ion exchange is 25 ℃; Step (2 ) in the addition amount of dicyandiamide is 2.20g, and the addition amount of tetrabutyl titanate is 2.0mL; in step (3), the initial closed calcination temperature is 500°C, the calcination time is 3.5h, the heating rate is 2°C / min, and the second The open calcination temperature is 450°C, the calcination time is 2.5h, and the heating rate is 4.5°C / min.

Embodiment 3

[0026] Same as step in embodiment 1, difference is: the add-on of modifying agent cetyltrimethylammonium bromide is 0.8CEC in the step (1), and the temperature of ion exchange is 25 ℃; Step (2) The addition amount of dicyandiamide in the medium is 3.0g, the addition amount of tetrabutyl titanate is 2.5mL; in step (3), the initial closed calcination temperature is 520°C, the calcination time is 3h, the heating rate is 3.0°C / min, and the second open The calcination temperature is 400°C, the calcination time is 3.0h, and the heating rate is 4°C / min.

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Abstract

The invention relates to a g-C3N4/TiO2@montmorillonite photocatalyst and a preparation method thereof, and belongs to the field of deep processing of nonmetallic mineral materials and environment engineering. With organic montmorillonite interlayer space as a micro reaction area, precursors of g-C3N4 and TiO2 are induced by a modifying agent in the interlayer space to enter a montmorillonite interlayer, nanometer g-C3N4/TiO2 heterojunction is generated in the montmorillonite interlayer through further hydrolysis, dehydroxylation and crystallization, and then the visible-light response montmorillonite-based composite photocatalysis material is obtained. By means of the method, the combination of montmorillonite and the visible-light response g-C3N4/TiO2 heterojunction is achieved, the pollutant adsorption and capture performance of the material and the dispersibility of the catalyst are improved through the carrier effect of montmorillonite. The load type photocatalysis material has excellent photocatalysis activity under visible light, and has great potential application value in the field of deep processing of organic waste water.

Description

technical field [0001] The invention relates to a montmorillonite composite g-C 3 N 4 / TiO 2 heterojunction (g-C 3 N 4 / TiO 2 The invention discloses a montmorillonite) photocatalyst and a preparation method thereof, which belong to the field of deep processing of non-metallic mineral materials and environmental engineering. Background technique [0002] In today's society, environmental pollution is a major challenge that human beings face and urgently need to be solved. Photocatalytic technology can use solar energy to degrade and mineralize various pollutants in water and air, and is an ideal environmental pollution control technology. TiO 2 Due to its non-toxicity, good stability, and excellent catalytic ability, photocatalytic materials have always been a hot spot in research and development at home and abroad, but in the process of large-scale practical use, there are still the following problems: low quantum efficiency, photogenerated electron-hole polarity Ea...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 孙志明郑水林李春全姚光远
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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