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

A polyethyleneimine, carbon nanodot technology, applied in the field of chemical detection, can solve the problems of complex operation, low sensitivity, and can not meet the needs of actual water sample detection, achieve simple production, avoid the use of large-scale instruments, and quickly on-site Visualize the effect of detection

Active Publication Date: 2021-09-14
WEST ANHUI UNIV
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of polyethylenimine-modified ascorbic acid carbon nano-dots, comprising the steps of: adding polyethyleneimine into a reaction kettle containing ascorbic acid solution, and the molar ratio of polyethyleneimine to ascorbic acid is 0.05-1 : 1, heat to 180-220°C after sealing, react for 5-7h, cool and filter, dialyze for 6-10h, change ultrapure water every 1.5-2.5h, freeze-dry to obtain carbon nano-dot powder; and ascorbic acid carbon nano-dot Application of fluorescent probe in visual detection of hypochlorous acid. The probe of the present invention is sensitive to hypochlorous acid, and the detection limit is 14nmol / L; it also has high selectivity to hypochlorous acid, good stability, can be stored and used for a long time, and the synthesis is simple, and a portable hypochlorous acid has been developed The detection test paper realizes the purpose of simple, rapid and visual detection of hypochlorous acid, and is conducive to commercial promotion and application.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap