G-C3N4 nanosheet with monodisperse structure and preparation method of g-C3N4 nanosheet

A nanosheet, monodisperse technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of low yield, long time, difficult to be separated and dried powder, etc., to achieve high yield, Uniform particle distribution and high surface activity

Inactive Publication Date: 2017-05-10
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid phase exfoliation has the problems of long time and low yield. Only a small part of the powder can be exfoliated into ultrafine nanostructures, and this ultrafine powder is also difficult to be separated in the liquid phase to obtain dryness. powder

Method used

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  • G-C3N4 nanosheet with monodisperse structure and preparation method of g-C3N4 nanosheet
  • G-C3N4 nanosheet with monodisperse structure and preparation method of g-C3N4 nanosheet
  • G-C3N4 nanosheet with monodisperse structure and preparation method of g-C3N4 nanosheet

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Embodiment 1

[0024] A monodisperse structure g-C 3 N 4 Nano sheet and preparation method thereof, concrete steps are as follows:

[0025] (1) One-time calcination: using melamine as raw material, put the raw material in a sintered boat, then place the sintered boat in a muffle furnace, and calcine at 550°C in air for 4 hours to obtain g-C 3 N 4 meal;

[0026] The g-C obtained in step (1) 3 N 4 Coarse powder looks like figure 2 As shown, it is mainly agglomerated powder with a size of micron.

[0027] (2) secondary calcination: with g-C in step (1) 3 N 4 Coarse powder is used as the raw material, the raw material is placed in a burning boat, and then the burning boat is placed in a sealed tube furnace, nitrogen is used as the carrier gas, nitrogen is passed through distilled water, and then enters the sealed tube furnace for calcination at 500°C for 2 hours , to obtain the monodisperse structure g-C 3 N 4 Nanosheets.

[0028] The g-C obtained in step (2) 3 N 4 Nanosheets look...

Embodiment 2

[0031] The preparation method of this embodiment is the same as that of Example 1, except that the melamine in step (1) is modified to urea.

[0032] g-C prepared in this embodiment 3 N 4 The specific surface area of ​​the nanosheet is 206m 2 g -1 , has a strong photocatalytic ability, under visible light conditions, the complete degradation of 20mg / L rhodamine B can be achieved within 10min, and the hydrogen production efficiency of photolysis water is 1157μmol·g -1 h -1 .

Embodiment 3

[0034] The preparation method of the present embodiment is the same as that of Example 1, except that the melamine in the step (1) is modified into dicyandiamide.

[0035] g-C prepared in this embodiment 3 N 4 The specific surface area of ​​the nanosheet is 220m 2 g -1 , has a strong photocatalytic ability, under visible light conditions, the complete degradation of 20mg / L rhodamine B can be achieved within 10min, and the hydrogen production efficiency of photolysis water is 1162μmol·g -1 h -1 .

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Abstract

The invention relates to the technical fields of micro-nano structures and photocatalysis, in particular to a g-C3N4 nanosheet with a monodisperse structure and a preparation method of the g-C3N4 nanosheet. The size of the g-C3N4 nanosheet with the monodisperse structure is 10 to 50nm; particles are uniformly distributed, so that the agglomeration phenomenon is avoided. The g-C3N4 nanosheet is prepared by a secondary calcination method under the condition of water vapor atmosphere, is mild in preparation conditions and can be prepared in macroscopic quantity; the g-C3N4 nanosheet with the monodisperse structure is large in specific surface area and good in dispersity, has higher reactive sites, and can be effectively applied to photocatalytic degradation of organic matters and production of hydrogen by water photodecomposition.

Description

technical field [0001] The invention relates to the technical fields of micro-nano materials, photocatalytic degradation of organic pollutants and hydrogen production by photolysis of water, in particular to a monodisperse structure g-C 3 N 4 Nanosheets and methods for their preparation. Background technique [0002] Graphite phase structure g-C 3 N 4 Since its discovery, it has received widespread attention because of its simple preparation process, readily available raw materials, and low cost. As a semiconductor material, nano g-C 3 N 4 Photocatalytic degradation of organic matter, photolysis of water to produce hydrogen and CO 2 Reduction and other fields have good application prospects. [0003] Nano g-C 3 N 4 How to prepare monodisperse g-C with graphite-like lamellar structure 3 N 4 Nanosheets are the concern of many scholars. Existing preparation g-C 3 N 4 The mainstream method is the pyrolysis organic method, that is, the preparation of g-C through the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082B82Y30/00B82Y40/00
CPCC01B21/0605B82Y30/00B82Y40/00C01P2002/72C01P2004/04C01P2004/20C01P2004/64C01P2006/12
Inventor 徐光青范程控苗继琳吕珺吴玉程
Owner HEFEI UNIV OF TECH
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