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A kind of functional detection paper and its preparation method and application

A technology for functional detection and functional fibers, which is applied in the direction of chemical reaction of materials and material analysis by observing the influence of chemical indicators. It can solve the problem of less detection and identification, and achieve good specific identification and preparation. Simple process and high detection sensitivity

Active Publication Date: 2022-02-18
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The third type of method has diversity and universality because it can carry out different combination designs, and it has got rid of many limitations of the first two methods. + 、Cu 2+ There are few reports on detection and identification, which has the significance of research and development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Function detection paper of the present invention is prepared by the method of following steps:

[0029] S1. Preparation of aminated polyacrylonitrile fiber: Dissolve diethylenetriamine in water to prepare a 10wt% aqueous solution, then soak the polyacrylonitrile fiber at 3wt% in it, heat to 90°C, react for 4 hours, after the reaction is completed, After washing and drying, the aminated polyacrylonitrile fiber is obtained.

[0030] S2. Preparation of polyacrylonitrile-based functional fibers: adding 3,3'-dithiodipropionic acid and thiodiacetic acid to the aminated polyacrylonitrile fiber prepared in step S1, two sulfur-containing polycarboxylic acid small molecule reagents The 50wt% mixed aqueous solution reacted for 4 hours to prepare polyacrylonitrile-based functional fibers; the mass ratio of 3,3'-dithiodipropionic acid to thiodiacetic acid was 1:1, and the aminated polyacrylonitrile fiber and 3 , The total mass ratio of 3'-dithiodipropionic acid to thiodiacetic aci...

Embodiment 2

[0033] Function detection paper of the present invention is prepared by the method of following steps:

[0034] S1. Preparation of aminated polyacrylonitrile fiber: Dissolve triethylenetetramine in water to prepare a 50wt% aqueous solution, then soak the polyacrylonitrile fiber at 4wt%, heat to 100°C, and react for 6 hours. After washing and drying, the aminated polyacrylonitrile fiber is obtained.

[0035] S2. Preparation of polyacrylonitrile-based functional fibers: add 3,3'-dithiodipropionic acid and (ethylenedithio)diacetic acid to the aminated polyacrylonitrile fibers prepared in step S1 Polyacrylonitrile-based functional fibers were reacted in 55wt% mixed aqueous solution of polycarboxylic acid small molecule reagent for 6h; the mass ratio of 3,3'-dithiodipropionic acid to (ethylenedithio)diacetic acid was 2:1.5, the total mass ratio of aminated polyacrylonitrile fiber to 3,3'-dithiodipropionic acid and (ethylenedithio)diacetic acid is 1:6.

[0036] S3. Preparation of ...

Embodiment 3

[0038] Function detection paper of the present invention is prepared by the method of following steps:

[0039] S1. Preparation of aminated polyacrylonitrile fiber: dissolve polyethyleneimine in water to prepare a 90wt% aqueous solution, then soak polyacrylonitrile fiber at 5wt% in it, heat to 110°C, and react for 10h. After washing and drying, the aminated polyacrylonitrile fiber is obtained.

[0040] S2. Preparation of polyacrylonitrile-based functional fibers: Add 60wt of two sulfur-containing polycarboxylic acid small molecule reagents, dithioglycolic acid and methylenebisthioacetic acid, to the aminated polyacrylonitrile fibers prepared in step S1 % reacted in the mixed aqueous solution for 8h to obtain polyacrylonitrile-based functional fibers; the mass ratio of dithioglycolic acid to methylenebisthioacetic acid was 2:3, and the aminated polyacrylonitrile fiber and dithioglycol The total mass ratio of acid to methylenebisthioacetic acid is 1:8.

[0041] S3. Preparation...

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Abstract

The invention discloses a functional detection paper and its preparation method and application. The structure of the functional detection paper contains high-density amino groups, carboxyl groups, and sulfur-containing groups, and through the synergistic effect of the three groups, the detection of Ag + 、Cu 2+ rapid and high-sensitivity detection; the functional detection paper is based on polyacrylonitrile fiber, which is aminated with amine reagents to obtain aminated polyacrylonitrile fiber, and then combined with two kinds of sulfur-containing polyacrylonitrile fibers of type A and type B Carboxylic acid small-molecule reagents are subjected to amidation reaction to prepare polyacrylonitrile-based functional fibers, and finally polyacrylonitrile-based functional fibers are mixed with bleached pulp fibers and reinforcing agents to form paper, and functional detection paper is prepared. The function detection paper of the present invention is simple and portable, has stable performance and low cost, and can realize the detection of Ag + 、Cu 2+ Rapid and highly sensitive detection of Ag + 、Cu 2+ The detection sensitivity can reach 10 ‑7 mol / L, the detection response time is 10-120s.

Description

technical field [0001] The invention relates to the technical field of heavy metal detection, in particular to a functional detection paper and its preparation method and application. Background technique [0002] Heavy metal pollution in the water environment seriously affects the ecological balance and human health, and it is a problem that cannot be ignored. Ag in water body exceeding rated standard + 、Cu 2+ It will produce serious toxic effects, and it is urgent to do a good job of detection and prevention. Currently Ag + 、Cu 2+ The detection mainly relies on traditional large-scale instruments such as ICP-MS, AAS, and XRF. Although they have high sensitivity and accurate detection, they are limited to laboratory operations, and the detection pretreatment is complicated, requiring professional operation, etc. For some Sudden pollution incidents or people's daily testing needs cannot provide portable on-site testing requirements. [0003] Colorimetry is a method to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 何辉董蝶周士乐黄美兰朱红祥
Owner GUANGXI UNIV
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