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steam assisted preparation g-c 3 no 4 nanosheet approach

A technology of g-c3n4 and nanosheets, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve problems such as low quantum efficiency, small specific surface area, photogenerated electron-hole recombination, etc., and achieve simple and easy operation , Process green effect

Active Publication Date: 2021-03-16
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to the properties of the polymer, the g-C 3 N 4 As a photocatalyst, there are the following problems: small specific surface area, severe photogenerated electron-hole recombination, low quantum efficiency, etc.
However, the introduced gas templating agent is composed of ammonium salts (such as NH 4 Cl and NH 4 NO 3 ) decomposition of harmful gases, such as NH 3 , HCl and NO x etc., causing damage to the environment

Method used

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  • steam assisted preparation g-c <sub>3</sub> no <sub>4</sub> nanosheet approach
  • steam assisted preparation g-c <sub>3</sub> no <sub>4</sub> nanosheet approach
  • steam assisted preparation g-c <sub>3</sub> no <sub>4</sub> nanosheet approach

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Preparation of g-C with magnesium hydroxide as steam source 3 N 4 Nanosheets, comprising the steps of:

[0022] Step 1. Raw material filling: Weigh 2 g of magnesium hydroxide, place it on the bottom of a cylindrical crucible with a diameter of 42 mm and spread it flat, place 8 g of melamine on the surface of the magnesium hydroxide and spread it flat, and wrap the crucible with tin foil;

[0023] Step 2. Preparation of g-C 3 N 4 Nanosheets: Place the crucible wrapped in step 1 in a muffle furnace, heat up to 520°C at a heating rate of 10°C / min and calcinate for 4 h, cool to room temperature, and obtain g-C on the upper layer of the crucible 3 N 4 Nanosheets.

Embodiment 2

[0025] Preparation of g-C with magnesium hydroxide as steam source 3 N 4 Nanosheets, comprising the steps of:

[0026] Step 1. Filling of raw materials: Weigh 6 g of magnesium hydroxide, place it on the bottom of a cylindrical crucible with a diameter of 42 mm and spread it flat, place 8 g of melamine on the surface of the magnesium hydroxide and spread it flat, and wrap the crucible with tin foil;

[0027] Step 2. Preparation of g-C 3 N 4 Nanosheets: Place the crucible wrapped in step 1 in a muffle furnace, heat up to 530°C at a heating rate of 18°C / min and calcinate for 3 h, cool to room temperature, and obtain g-C on the upper layer of the crucible 3 N 4 Nanosheets.

Embodiment 3

[0029] Preparation of g-C with magnesium hydroxide as steam source 3 N 4 Nano sheet, it comprises the steps:

[0030] Step 1. Raw material filling: Weigh 12 g of magnesium hydroxide, place it on the bottom of a cylindrical crucible with a diameter of 42 mm and spread it flat, place 8 g of melamine on the surface of the magnesium hydroxide and spread it flat, and wrap the crucible with tin foil;

[0031] Step 2. Preparation of g-C 3 N 4 Nanosheets: Place the crucible wrapped in step 1 in a muffle furnace, heat up to 540°C at a rate of 13°C / min and calcinate for 4 h, cool to room temperature, and obtain g-C on the upper layer of the crucible 3 N 4 Nanosheets.

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Abstract

The invention discloses a method for preparing g-C3N4 nano-sheets by assistance of steam. The method comprises the following steps: step 1, laying a metal hydroxide-containing substance which generates steam at a temperature higher than a preset temperature as a template agent, then laying melamine on the surface of the template agent, and carrying out packaging; and step 2, calcining the packagedtemplate agent and melamine, carrying out cooling, and taking the upper layer to obtain the g-C3N4 nano-sheets. The method has the beneficial effects of simple operation and environmental protection.

Description

technical field [0001] The invention relates to the field of semiconductor catalysis. More specifically, the present invention relates to a steam-assisted preparation of g-C 3 N 4 nanosheet method. Background technique [0002] Environmental pollution and energy crisis are major problems that need to be solved urgently in the world today. Hydrogen energy, as a clean energy source, has drawn close attention from governments and scientists around the world, and photocatalytic water splitting is considered to be an ideal green technology to obtain hydrogen. Graphite carbon nitride (g-C 3 N 4 ) is a typical polymer semiconductor, the C and N atoms in its structure are represented by sp 2 Hybridization forms a highly delocalized π-conjugated system with a narrow band gap (about 2.7 eV), suitable valence and conduction band positions, good chemical inertness and thermal stability, non-toxic, and can absorb the solar spectrum Blue-violet light with a medium wavelength less t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/082B01J27/24B01J20/02B01J20/30B82Y30/00B82Y40/00C01B3/04
CPCB01J20/0259B01J27/24B01J35/004B01J2220/4806B01J2220/4812B82Y30/00B82Y40/00C01B3/042C01B21/082C01B2203/0277Y02E60/36
Inventor 舒杼谭义根周俊
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)