Simple preparation method and application of porous g-C3N4 (graphite-phase carbon nitride) nanosheet

A technology of phase carbon nitride and porous graphite is applied in the field of simple preparation of porous g-C3N4 nanosheets, which can solve the problems of reducing interlayer hydrogen bonds and van der Waals forces, unfavorable large-scale application, low efficiency, etc., and achieves short synthesis time. , low cost and high efficiency

Inactive Publication Date: 2018-07-24
GUIZHOU MEDICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, most reports have used ultrasonic exfoliation to prepare g-C 3 N 4 For nanosheets, solvents such as isopropanol, methanol, and pyrrolidone reduce interlayer hydrogen bonds and van der Waals forces through intercalation during the exfoliation process, which is beneficial to g-C 3 N 4 Preparation of nanosheets, but such solvents have high boiling point, high toxicity, high cost and low efficiency, which are not conducive to large-scale application

Method used

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  • Simple preparation method and application of porous g-C3N4 (graphite-phase carbon nitride) nanosheet
  • Simple preparation method and application of porous g-C3N4 (graphite-phase carbon nitride) nanosheet

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Embodiment 1

[0022] This embodiment provides a porous g-C 3 N 4 Preparation methods of nanosheets.

[0023] 1. Weigh 10g of dicyandiamide and 5g of ammonium chloride respectively, mix them and place them in a semi-closed crucible, heat up to 550°C in a muffle furnace and calcinate for 2 hours, cool to room temperature, and grind to obtain yellow g-C 3 N 4 powder;

[0024] 2. Weigh g-C 3 N 4 Add 100mg of the powder into a mixed solution of 300mL isopropanol and distilled water (v / v=3:1), sonicate for 30min to obtain g-C 3 N 4 suspension;

[0025] 3. Put g-C 3 N 4 The suspension was centrifuged at 4000rpm for 5min to obtain white stable porous g-C 3 N 4 nanosheet solution.

Embodiment 2

[0027] This embodiment provides a porous g-C 3 N 4 Preparation methods of nanosheets.

[0028] 1. Weigh 10g of dicyandiamide and 15g of ammonium chloride respectively, mix them and put them in a semi-closed crucible, heat up to 550°C in a muffle furnace for 2 hours, cool to room temperature, and grind to obtain yellow g-C 3 N 4 powder;

[0029] 2. Weigh g-C 3 N 4 Powder 100mg, add 300mL distilled water, ultrasonic 45min, prepared g-C 3 N 4 suspension;

[0030] 3. Put g-C 3 N 4 The suspension was allowed to stand at room temperature for 48 hours to obtain white stable porous g-C 3 N 4 nanosheet solution.

[0031] The porous g-C prepared in this embodiment 3 N 4 The transmission electron microscope (TEM) image of the nanosheets is as follows: figure 1 shown. Its flake-like structure can be seen from the figure.

Embodiment 3

[0033] This example provides porous g-C 3 N 4 Simultaneous fluorescence properties, selectivity and applications of nanosheets.

[0034] (1) Simultaneous fluorescence performance

[0035] The white stable porous g-C prepared by the present invention 3 N4 The nanosheet solution was rotovapped at 40 °C to obtain a white powder. Weigh 2 mg of white powder and disperse it in 1 L of ultrapure water, configure it into a 2 mg / L solution, and measure its synchronous fluorescence spectrum as figure 2 . It can be seen from the figure that at extremely dilute concentrations of porous g-C 3 N 4 In the nanosheet solution, there are strong synchronous fluorescence peaks.

[0036] (2) Simultaneous fluorescence enhancement, selectivity and its application

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Abstract

The invention provides a simple preparation method and application of a porous g-C3N4 (graphite-phase carbon nitride) nanosheet. The simple preparation method comprises the following steps of (1) mixing dicyandiamide and ammonia chloride according to a certain mass ratio, and heating for 2 to 4h at the temperature of 500 to 600 DEG C, so as to obtain a yellow solid of g-C3N4; grinding into powder;(2) adding 50 to 200mg of g-C3N4 powder into 150 to 300mL of solvent, treating for 0.5 to 2h by ultrasonic waves, centrifuging for 5min at the rotation speed of 5000r/min, and removing the large-sizeg-C3N4, so as to obtain a white stable porous g-C3N4 nanosheet solution. The prepared porous g-C3N4 nanosheet has good stability and synchronous fluorescence property in water; under the condition ofexistence of silver ions, the synchronous fluorescence is greatly enhanced; the synchronous fluorescence has excellent selective response to the silver ions. The preparation method has the advantagesthat the preparation method is simple and convenient, and is easy to implement; the synthesizing time is short, the cost is low, and the efficiency is high; the prepared porous g-C3N4 nanosheet can be used for analyzing and detecting trace silver ions.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a porous g-C 3 N 4 A convenient preparation method of nanosheets and its application. The porous g-C 3 N 4 The nanosheet has strong synchronous fluorescence, and the synchronous fluorescence is enhanced when silver ions exist, and can be applied to the analysis and detection of trace silver ions. Background technique [0002] Resonance Rayleigh scattering is a kind of elastic scattering, when the incident light wavelength is close to or coincides with the molecular absorption band, the scattered light is greatly enhanced. The electrons absorb light at the same frequency as the scattered light. Resonant Rayleigh scattered light is stronger compared to Raman scattering. Therefore, resonant Rayleigh scattering can be used to detect trace substances, and has a wide range of applications in the fields of chemistry, biology, and environmental research. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082B82Y40/00C09K11/65G01N21/64
CPCB82Y40/00C01B21/0605C01P2002/80C01P2004/04C01P2004/20C09K11/65G01N21/6428
Inventor 冯建徐科徐红
Owner GUIZHOU MEDICAL UNIV
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