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Preparation method of fluorescence sensor for Cr (VI) real-time detection and product produced thereby

A technology for fluorescent sensors and membranes, applied in nanotechnology for sensing, chemical instruments and methods, fluorescence/phosphorescence, etc., can solve the problem of carbon dot shedding, affecting the stability of detection results, and the failure of fluorescent sensors to realize recycling, etc. problem, to achieve the effect of improved sensitivity, high selectivity and sensitivity

Pending Publication Date: 2021-04-23
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the carbon dots and the paper are only combined by a weak force, the carbon dots will fall off due to the poor binding force between the carbon dots and the paper, which will affect the stability of the detection results, and this type of fluorescent sensor cannot be recycled.

Method used

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  • Preparation method of fluorescence sensor for Cr (VI) real-time detection and product produced thereby
  • Preparation method of fluorescence sensor for Cr (VI) real-time detection and product produced thereby
  • Preparation method of fluorescence sensor for Cr (VI) real-time detection and product produced thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Dissolve N,N'-succinimidyl carbonate (DSC) in 1,4-dioxane, the concentration range is 1wt.%, and add a small amount of triethylamine (TEA), the addition amount is 0.5wt.%;

[0033] (2) The PVA-co-PE nanofiber film prepared by electrospinning process, the spinning process is: voltage 20kV, concentration 10%, spinning length 15cm, spinning speed is 1mL / h; PVA-co-PE nanofiber Add the membrane to the solution of (1) above, heat and slowly stir to react, the stirring speed is 150rpm, the heating temperature is 60°C, and the stirring reaction time is 2h to prevent the membrane from breaking;

[0034] (3) After the reaction is completed, the membrane is fully washed with 1,4-dioxane, and dried at 50°C for later use;

[0035] (4) Dissolve a certain amount of carbon dot powder in deionized water at a concentration of 0.2g / L; immerse the activated PVA-co-PE nanofiber membrane in the carbon dot solution, and slowly stir the reaction at a reaction temperature of 70°C. Reactio...

Embodiment 2

[0038] (1) Dissolve N,N'-succinimidyl carbonate (DSC) in 1,4-dioxane at a concentration range of 2.5wt.%, and add a small amount of triethylamine (TEA). 0.5wt.%;

[0039] (2) The PVA-co-PE nanofiber film prepared by electrospinning process, the spinning process is: voltage 20kV, concentration 10%, spinning length 15cm, spinning speed is 1mL / h; PVA-co-PE nanofiber Add the membrane to the solution of (1) above, heat and slowly stir to react, the stirring speed is 150rpm, the heating temperature is 60°C, and the stirring reaction time is 2h to prevent the membrane from breaking;

[0040] (3) After the reaction is completed, the membrane is fully washed with 1,4-dioxane, and dried at 50°C for later use;

[0041] (4) Dissolve a certain amount of carbon dot powder in deionized water at a concentration of 0.2g / L; immerse the activated PVA-co-PE nanofiber membrane in the carbon dot solution, and slowly stir the reaction at a reaction temperature of 70°C. Reaction time 120min;

[0042...

Embodiment 3

[0044] (1) Dissolve N,N'-succinimidyl carbonate (DSC) in 1,4-dioxane, the concentration range is 5wt.%, and add a small amount of triethylamine (TEA), the addition amount is 0.5wt.%;

[0045] (2) The PVA-co-PE nanofiber film prepared by electrospinning process, the spinning process is: voltage 20kV, concentration 10%, spinning length 15cm, spinning speed is 1mL / h; PVA-co-PE nanofiber Add the membrane to the solution of (1) above, heat and slowly stir to react, the stirring speed is 150rpm, the heating temperature is 60°C, and the stirring reaction time is 2h to prevent the membrane from breaking;

[0046] (3) After the reaction is completed, the membrane is fully washed with 1,4-dioxane, and dried at 50°C for later use;

[0047] (4) Dissolve a certain amount of carbon dot powder in deionized water at a concentration of 0.2g / L; immerse the activated PVA-co-PE nanofiber membrane in the carbon dot solution, and slowly stir the reaction at a reaction temperature of 70°C. Reactio...

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Abstract

The invention discloses a preparation method of a fluorescence sensor for Cr (VI) real-time detection and a product produced thereby. The preparation method comprises the steps of: dissolving N,N'- succinimido carbonate in 1, 4-dioxane, adding triethylamine, uniformly stirring, adding a PVA-co-PE nanofiber membrane, heating, and slowly stirring for reaction; after the reaction is finished, fully washing the membrane with 1, 4-dioxane, and drying the membrane at low temperature to obtain an activated PVA-co-PE nanofiber membrane; dissolving carbon dot powder into deionized water, with the concentration being 0.2 g / L-5 g / L; immersing the activated PVA-co-PE nanofiber membrane into the carbon dot solution, and slowly stirring to react for 30-180 minutes at the reaction temperature of 20-100 DEG C; and washing the membrane with ultra-pure water until no fluorescence is detected in the residual liquid to obtain a carbon dot-based nanofiber membrane, namely the fluorescence sensor. The fluorescence sensor has high selectivity and sensitivity, the maximum detection limit can reach 1 ppb or below, and after the fluorescence sensor is repeatedly used for five times, the morphology of the nanofibers is still kept good.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional nanofiber membranes, and in particular relates to a method for preparing a fluorescence sensor for instant detection of Cr(VI) and a product thereof. Background technique [0002] Carbon dots generally refer to a nano-carbon with a size of less than 10nm, a quasi-spherical structure, and stable luminescence. It is a new carbon nanomaterial that has emerged in recent years. Due to its good water solubility, stable fluorescence properties, The advantages of excellent biocompatibility and easy functionalization have attracted many researchers. [0003] Based on the unique fluorescent properties of carbon dots that will undergo fluorescence quenching after contacting with some specific ions, it can be used to prepare fluorescent probes for ion detection. In recent years, researchers have done a lot of research on improving the detection sensitivity and selectivity of carbon dots, an...

Claims

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Application Information

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IPC IPC(8): G01N21/64C09K11/65C09K11/02B82Y15/00B82Y40/00
CPCG01N21/643C09K11/65C09K11/025B82Y15/00B82Y40/00
Inventor 余媛朱海霖于斌闫彦红何薇薇
Owner ZHEJIANG SCI-TECH UNIV
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