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Preparation method for chlorine-doped carbon quantum dot/g-C3N4 nano sheet composite material for high-effectively degrading antibiotics

A technology of chlorocarbon quantum and composite materials, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science. problem, to achieve the effect of wide light absorption range, large specific surface area, and excellent photocatalytic degradation performance

Active Publication Date: 2017-10-24
黄山市开发投资集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Carbon quantum dots / g-C prepared so far 3 N 4 Composite materials, due to the low absorption of visible light and the high recombination rate of photogenerated electron-hole pairs, seriously affect the photocatalytic activity.

Method used

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  • Preparation method for chlorine-doped carbon quantum dot/g-C3N4 nano sheet composite material for high-effectively degrading antibiotics
  • Preparation method for chlorine-doped carbon quantum dot/g-C3N4 nano sheet composite material for high-effectively degrading antibiotics

Examples

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Embodiment 1

[0027] A Chlorine-doped Carbon Quantum Dot / g-C for Efficient Degradation of Antibiotics 3 N 4 The preparation method of nano sheet composite material, concrete steps are as follows:

[0028] (1) g-C 3 N 4 Preparation of nanosheets: Using melamine as raw material, put the raw material into a crucible and place it in a muffle furnace, and calcinate at 550°C for 4 hours to obtain the original g-C 3 N 4 ; the obtained original g-C 3 N 4 Open calcination at 475°C for 2 hours, that is, two calcinations to obtain g-C 3 N 4 Nanosheets;

[0029] (2)g-C 3 N 4 Protonation of nanosheets: the g-C prepared in step (1) 3 N 4 The nanosheets were dispersed in 3mol / L HCL solution, stirred for 3 hours, and centrifuged to obtain protonated g-C 3 N 4 Nanosheets;

[0030] (3) Preparation of chlorine-doped carbon quantum dots: put 30mL of ethylene glycol into the reactor, heat to 200°C, keep warm for 5h, cool to room temperature, and centrifuge the solution in the reactor to obtain th...

Embodiment 2

[0036] The preparation method of this example is the same as that of Example 1, except that the volume of thionyl chloride in step (3) is modified from 250uL to 350uL.

[0037] Chlorine-doped carbon quantum dots / g-C prepared in this embodiment 3 N 4 The nanosheet composite material has strong photocatalytic ability, and can completely degrade 10mg / L tetracycline hydrochloride (TC) within 120min under visible light conditions, and the kinetic constant of degrading TC solution is 9.72×10 -3 min -1 .

Embodiment 3

[0039] The preparation method of this example is the same as that of Example 1, except that the volume of thionyl chloride in step (3) is modified from 250uL to 450uL.

[0040] Chlorine-doped carbon quantum dots / g-C prepared in this embodiment 3 N 4 Nanosheet composite material, with strong photocatalytic ability, can completely degrade 10mg / L tetracycline hydrochloride (TC) within 120min under visible light conditions, and the kinetic constant of degrading TC solution is 10.15×10 -3 min -1 .

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Abstract

The invention belongs to the technical field of photocatalysis and particularly relates to a preparation method for a chlorine-doped carbon quantum dot / g-C3N4 nano sheet composite material for high-effectively degrading antibiotics. G-C3N4 nano sheets are produced through two-time calcinations in air; then the g-C3N4 nano sheets are subjected to protonation in a hydrochloric acid solution; a chlorine-doped carbon quantum dot solution is then produced with ethylene glycol and thionyl chloride as raw materials; and finally, the composite material is prepared from the chlorine-doped carbon quantum dot solution and the protonated g-C3N4 nano sheets through an electrostatic self-assembly method. The composite material is enhanced in absorption to visible lights and effectively separates photon-generated carriers, and further can be effectively applied to photocatytic degradation of antibiotics.

Description

technical field [0001] The invention relates to the field of photocatalytic degradation of antibiotics, and relates to a chlorine-doped carbon quantum dot / g-C that efficiently degrades antibiotics 3 N 4 Preparation methods of nanosheet composites. Background technique [0002] In recent years g-C 3 N 4 Proven to be a novel photocatalyst with visible light absorption, g-C 3 N 4 The optical band gap is 2.7eV, due to the strong covalent bond between carbon and nitrogen, it is suitable for use in aqueous solution, acidic solution and alkaline solution. Currently g-C 3 N 4 As a photocatalyst, it can be used in the reduction of CO 2， Hydrogen production by photolysis of water, selective oxidation of alcohols, decomposition of pollutants, etc. However, g-C 3 N 4 The quantum efficiency of the is very low, limiting the g-C 3 N 4 practical application. [0003] Carbon quantum dots (CQDs) are a new type of carbon nanomaterials with a size of less than 10 nm. They have exc...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J21/18B82Y30/00A62D3/17
CPCA62D3/17B82Y30/00B01J21/18B01J27/24B01J35/39
Inventor 吕珺汪宇徐光青郑治祥吴玉程
Owner 黄山市开发投资集团有限公司
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