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A carbon nitride paper-based fluorescent sensor and its preparation method and application

A fluorescence sensor and carbon nitride paper technology, applied in the field of fluorescence sensing, can solve the problems of long detection period, low stability and high price of polycyclic aromatic hydrocarbons, and achieve the effects of improving atom utilization, easy portability and low price

Active Publication Date: 2022-05-17
SOUTHEAST UNIV
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  • Description
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Problems solved by technology

[0005] Purpose of the invention: Aiming at the problems existing in the prior art, the present invention provides a carbon nitride paper-based fluorescence sensor for detecting polycyclic aromatic hydrocarbons, which can effectively solve the problem of long detection period and complicated operation of polycyclic aromatic hydrocarbons in the prior art. , low stability and expensive

Method used

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  • A carbon nitride paper-based fluorescent sensor and its preparation method and application
  • A carbon nitride paper-based fluorescent sensor and its preparation method and application
  • A carbon nitride paper-based fluorescent sensor and its preparation method and application

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Effect test

Embodiment 1

[0046] The preparation process of carbon nitride nanocomposites is as follows:

[0047] Urea was raised to 550°C in a muffle furnace at a heating rate of 2°C / min and kept for 2 hours. After natural cooling at room temperature, CNNS was obtained directly, and 30mL of CNNS aqueous solution (0.2mg / mL) was prepared, and ultrasonic 30min (power 100W); Take by weighing 30mLPMAA-Na, 0.2β-CD and mix and stir with above-mentioned CNNS solution, carry out ultrasonic 15min (power is 100W); ) about 15mL, stir evenly, place the mixed solution in a water bath and heat at 80°C for 3 hours, the solution will produce PMAA-CNNS precipitation; after the temperature drops to room temperature, pour out the supernatant, and freeze the gelatinous precipitate at the bottom After drying, the obtained particles are collected for future use to obtain a carbon nitride nanocomposite material.

[0048] The preparation process of the carbon nitride paper-based fluorescent sensor is as follows:

[0049] Ta...

Embodiment 2

[0059] The preparation process of carbon nitride nanocomposites is as follows:

[0060] Dicyandiamide was raised to 550°C for 4 hours at a heating rate of 4°C / min in a muffle furnace. After natural cooling at room temperature, bulk carbon nitride was obtained, and the bulk carbon nitride was subjected to liquid-phase exfoliation by ultrasound for 12 hours. (power 100W) to obtain CNNS; prepare 30mL CNNS aqueous solution (0.5mg / mL), sonicate for 30min (power 100W); weigh 30mL PAM, mix 0.3gβ-CD with the above CNNS solution and stir evenly, and then sonicate for 15min (power 100W); the mixed solution was freeze-dried, and the obtained particles were collected for later use to obtain carbon nitride nanocomposites.

[0061] The preparation process of the carbon nitride paper-based fluorescent sensor is as follows:

[0062] Take 1g of the nanocomposite material and disperse it in 15mL of ethanol, cut the filter paper into 2*1cm 2 The filter paper was soaked in the solution for 20 m...

Embodiment 3

[0067] The preparation process of carbon nitride nanocomposites is as follows:

[0068] Melamine is heated up to 600°C for 4 hours at a heating rate of 4°C / min in a muffle furnace. After natural cooling at room temperature, bulk carbon nitride is obtained, and the bulk carbon nitride is subjected to ultrasonic 12-hour liquid phase stripping (power 100W ), to obtain CNNS; prepare 30mL CNNS aqueous solution (0.05mg / mL), ultrasonic 30min (power 100W); add 0.6g DMA and 0.05g MBA to the CNNS solution and mix, transfer the mixed solution to a vial, and pass nitrogen gas for 3- For 5 minutes, tighten the lid, and irradiate with a 100W fluorescent lamp until the gel is formed; freeze-dry the gel, collect the obtained particles for later use, and obtain a carbon nitride nanocomposite material.

[0069] The preparation process of the carbon nitride paper-based fluorescent sensor is as follows:

[0070] Take 1g nanocomposite and disperse in 20mL DMF, cut the filter paper into 2*1cm 2 s...

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Abstract

The invention discloses a carbon nitride paper-based fluorescent sensor for detecting polycyclic aromatic hydrocarbons and its preparation method and application. The carbon nitride paper-based fluorescent sensor of the present invention is first made into a carbon nitride nanocomposite material, and The composite material is loaded on the filter paper to obtain the carbon nitride paper-based fluorescence sensor. The present invention utilizes the excellent luminescence performance of carbon nitride and the film-forming process, and after compounding with polymer materials, loads it on filter paper to obtain a carbon nitride paper-based fluorescence sensor, in which CNNS interacts with PAHs π-π, Fluorescence is quenched for linear detection of PAHs. The carbon nitride paper-based fluorescence sensor of the present invention can effectively solve the problems of long detection period, complex operation and low stability of polycyclic aromatic hydrocarbons in the prior art, can effectively detect PAHs, and is convenient, fast, easy to carry, and has high detection sensitivity .

Description

technical field [0001] The invention belongs to the field of fluorescence sensing, and in particular relates to a carbon nitride paper-based fluorescence sensor for detecting polycyclic aromatic hydrocarbons, a preparation method and application thereof. Background technique [0002] Due to the incomplete combustion of carbon-containing compounds in nature, a large number of toxic and carcinogenic polycyclic aromatic hydrocarbons (PAHs) are widely present in the air, soil and food, and the chemical structure of PAHs is very stable, and it is easy to produce abundant in organisms. It is difficult to remove, which seriously threatens human life and health. Therefore, for PAHs, the development of an efficient, sensitive and simple detection method is a hot spot in the world. As early as 1976, the U.S. Environmental Protection Agency listed 16 polycyclic aromatic hydrocarbons including "naphthalene, anthracene, and phenanthrene" as priority pollutants; in 1990, my country set s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 张袁健韩丹沈艳飞
Owner SOUTHEAST UNIV
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