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A functional polymer material with specific recognition and rapid detection of chromium ions and its preparation and application

A technology of functional polymers and chromium ions, applied in the field of detection, can solve the problems of inapplicable rapid detection of heavy metal ions, complex and cumbersome operation process, and high technical requirements for detection personnel, and achieve the effects of low cost, good selectivity and high sensitivity

Active Publication Date: 2021-02-19
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional standard trace heavy metal analysis techniques (in the ppm and ppb range), such as atomic absorption spectrometry (AAS) inductively coupled plasma mass spectrometry (ICP), mass spectrometry (MS), X-ray fluorescence spectrometry (R-FS ), etc., this type of detection method has high sensitivity and selectivity, and the analysis results are accurate, but the equipment used is sophisticated, the operation process is complicated and cumbersome, and the technical requirements for the detection personnel are high, so it is not suitable for the rapid detection of heavy metal ions in the field

Method used

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  • A functional polymer material with specific recognition and rapid detection of chromium ions and its preparation and application
  • A functional polymer material with specific recognition and rapid detection of chromium ions and its preparation and application

Examples

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Embodiment 1

[0041] (1) Preparation of aldylated chitosan: get the chitosan of 10g molecular weight 50000 and place it in the reaction vessel of 65-68% nitric acid, 85% phosphoric acid mixed acid, wherein the addition of mixed acid is 140ml , the volume ratio of nitric acid and phosphoric acid is 4:1, and sodium nitrite is subsequently added, and the mass ratio of the added amount to the amount of chitosan is 1:5. Seal the reaction for 8 hours, add 500ml of deionized water to the reaction vessel after the reaction, and air-dry the prepared aldehylated chitosan at 50°C for 24 hours for use.

[0042] (2) Introducing carboxyl functional groups. Get 1g of the prepared aldehylation chitosan and place it in the reaction container, add 20ml PBS buffer solution in advance in this container, the pH of this buffer solution is 7.2, add glutamic acid, the addition amount is the same as the formaldehyde chitosan The mass ratio of sugar was 1:1. The reaction was carried out at 30°C and 3000rpm magnetic...

Embodiment 2

[0045] (1) Preparation of aldylated chitosan: get the chitosan of 10g molecular weight 50000 and place it in the reaction vessel of 65-68% nitric acid, 85% phosphoric acid mixed acid, wherein the addition of mixed acid is 150ml , the volume ratio of nitric acid and phosphoric acid is 5:1, followed by adding sodium nitrite, the mass ratio of the amount added to the amount of chitosan is 1:4. Seal the reaction for 8 hours, add 500 ml of deionized water to the reaction vessel after the reaction, and place the prepared aldehylated chitosan in a blast drying oven at 50° C. for 24 hours before use.

[0046] (2) Introducing carboxyl functional groups. Get 1g of prepared aldehylation chitosan and place it in a reaction container, add 20ml of PBS buffer solution in advance in this container, the pH of this buffer solution is 7.4, add glutamic acid, and the addition amount is the same as that of the aldehylation shell The mass ratio of polysaccharides was 1:2, 30°C, 3000rpm magnetic st...

Embodiment 3

[0049] (1) prepare aldylated chitosan: get 10g molecular weight and be the chitosan of 50000 and place it in the reaction vessel of 65-68% nitric acid, 85% phosphoric acid mixed acid, wherein mixed acid consumption is 140ml, The volume ratio of nitric acid and phosphoric acid is 4:1, followed by adding potassium nitrite, and the mass ratio of the added amount to the amount of chitosan is 1:5. Seal the reaction for 8 hours, add 500 ml of deionized water to the reaction vessel after the reaction, and place the prepared aldehylated chitosan in a blast drying oven at 50° C. for 24 hours before use.

[0050] (2) Introducing carboxyl functional groups. Get 1g of the prepared aldylated chitosan and place it in a reaction container, add 20ml of PBS buffer in advance in this container, the pH of this buffer is 7.2, add 2-aminoethanesulfonic acid, and the addition amount is the same as aldehyde The mass ratio of ylated chitosan is 1:1, 30°C, 3000rpm magnetic stirring reaction for 4 hou...

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Abstract

The invention discloses a functional macromolecular material with specific identification and rapid detection of chromium ions and its preparation and application. The present invention obtains functional macromolecular materials with specific identification and rapid detection of chromium ions by carrying out carboxyl and sulfhydrylation of formaldehyde chitosan. The functional polymer material and the heavy metal chromium ion can form a complex with a stable structure, so that the chromium ion can be detected accurately and rapidly. Compared with the detection equipment in the traditional sense, the material of the present invention has high sensitivity and good selectivity, and does not need to use expensive and complicated precision instruments, and can realize on-site detection and classification of pollution levels only by using detection reagents. The results are considerable to the naked eye, the operation is simple and the cost is low, and the reagents used and the operation process have no toxic and side effects.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a functional polymer material capable of specific recognition and rapid detection of chromium ions and its preparation and application. Background technique [0002] Heavy metals involved in environmental pollution usually refer to density greater than 5.0g / cm 3 A class of metals with significant biological toxicity, mainly heavy metals such as cadmium, mercury, arsenic, copper, lead, zinc, chromium, and nickel. With the rapid development of industrialization, more and more heavy metals are released into the surrounding environment, such as: water environment, agricultural land. The pollution of heavy metals to agricultural land and environmental water bodies ultimately affects human health. Due to the strong chelation effect of heavy metal ions, the generated chelates are difficult to degrade and are easily enriched through the food chain, and finally transferred...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08G01N21/31
CPCC08B37/003G01N21/31
Inventor 蒋刚彪孙超胡甜林敏钊刘步宁刘金文
Owner SOUTH CHINA AGRI UNIV