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Polyethyleneimine modified ascorbic acid carbon nanodots, preparation method and application

A polyethyleneimine and ascorbic acid technology, which is applied in the field of chemical detection, can solve the problems of inability to meet the needs of actual water sample detection, low sensitivity, complicated operation, etc., and achieve rapid on-site visual detection, simple production, and omission of pretreatment process. Effect

Active Publication Date: 2019-07-09
WEST ANHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These detection methods are complicated to operate and have low sensitivity, which cannot meet the needs of actual water sample detection.

Method used

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  • Polyethyleneimine modified ascorbic acid carbon nanodots, preparation method and application
  • Polyethyleneimine modified ascorbic acid carbon nanodots, preparation method and application
  • Polyethyleneimine modified ascorbic acid carbon nanodots, preparation method and application

Examples

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Effect test

Embodiment 1

[0031] A preparation method of polyethylenimine-modified ascorbic acid carbon nano-dots, comprising the following steps:

[0032] Weigh 3.0g polyethyleneimine (PEI, molecular weight is 600) and add it to 20mL containing 0.8807g ascorbic acid reaction kettle solution, the molar ratio of polyethyleneimine and ascorbic acid used is 1:1, fully stir, seal, heat to 200 ℃, reacted for 6 hours, cooled to room temperature to obtain a light yellow liquid, then filtered through a 0.45 μM needle filter to remove larger particles in the solution, and then dialyzed with ultrapure water (the dialysis bag has a Dalton molecular weight of 1000) for 8 hours , change the ultrapure water every 2 hours, freeze-dry to obtain carbon nano-dot powder, and set aside.

[0033] Get the carbon nano-dot powder that embodiment 1 makes, analyze its morphology and size distribution, its TEM result is as follows figure 1 As shown, the particle size of carbon nanodots is about 3nm. After continuous scanning b...

Embodiment 2

[0035] A preparation method of polyethylenimine-modified ascorbic acid carbon nano-dots, comprising the following steps:

[0036] Take 2.0g polyethyleneimine (PEI, molecular weight is 10000) and join in 20mL containing 0.7045g ascorbic acid solution, the molar ratio of polyethyleneimine and ascorbic acid used is 0.1:2, transfer to the reaction kettle, seal, heat to 200 ℃, react for 6 hours, cool to room temperature, and filter the obtained brown-yellow liquid through a 0.45 μM needle filter to remove suspended particles in the solution, and then dialyze with a dialysis bag with a Dalton molecular weight of 10,000 for 8 hours, and change it every 2 hours Ultrapure water, freeze-dried to obtain carbon nano-dot powder, and set aside.

Embodiment 3

[0038] The quantitative detection of hypochlorous acid by ascorbic acid carbon nano-dot fluorescent probe is as follows:

[0039] The carbon nano-dot powder synthesized in Example 1 was dispersed in ultrapure water to make a fluorescent probe dispersion with a concentration of 2 μg / mL, and a standard solution of hypochlorous acid (0.0, 2.5, 5.0, 7.5, 10.0 , 12.5 and 15μM), with the increase of hypochlorous acid concentration, the fluorescence intensity gradually decreases, and the fluorescence spectral response process is as follows image 3 shown.

[0040] The linear relationship between fluorescence quenching intensity and hypochlorous acid concentration is, Y=0.0084+0.06468[HClO], linear correlation coefficient R 2 =9927, the detection limit is 14nM, such as Figure 4 , based on this linear relationship, the quantitative detection of hypochlorous acid can be realized.

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Abstract

The invention discloses a preparation method of polyethyleneimine modified ascorbic acid carbon nanodots. The method comprises the following steps of adding polyethyleneimine to a reaction kettle containing ascorbic acid solution, wherein the molar ratio of polyethyleneimine to ascorbic acid is 0.05-1:1; heating to 180-220DEG C after sealing, reacting for 5-7h, cooling and filtering, dialyzing for6-10h, replacing with ultra-pure water at intervals of 1.5-2.5h, and freeze-drying to obtain carbon nano-point powder. And application of ascorbic acid carbon nanodots as a fluorescent probe in visual detection is also provided. The probe provided by the invention is sensitive to hypochlorous acid response having a detection limit of 14nmol / L, has high selectivity and good stability to hypochlorous acid to enable long-term preservation and use, is simple in synthesis, and researches portable hypochlorous acid detection test papers to achieve the purpose of simple, rapid and visual detection of hypochlorous acid, which is beneficial to the popularization and application of commercialization.

Description

technical field [0001] The invention relates to the technical field of chemical detection, in particular to polyethyleneimine-modified ascorbic acid carbon nano-dots, a preparation method and application. Background technique [0002] Hypochlorous acid is a strong oxidizing weak acid, which is widely used in life and industry as a disinfectant, bleach, deodorant, etc. For example, chlorine gas is often passed through tap water for sterilization, swimming pools are disinfected with products containing sodium hypochlorite, and dyes and organic colors are faded with hypochlorous acid. These applications will inevitably leave a part of hypochlorous acid, which will pollute the water body and cause water environmental pollution problems. Long-term ingestion of water containing hypochlorous acid can cause tissue damage and pathological changes in the physiological system, including skin diseases, neuronal degeneration, cystic fibrosis, arthritis, cancer, and liver cirrhosis. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 闫叶寒黄润陈丽娟刘仁勇
Owner WEST ANHUI UNIV
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