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Preparation method and application of biomass cellulose-based detection material

A cellulose-based, material-detecting technology, which is applied in the direction of chemical reaction of materials for analysis, analysis of materials, chemical instruments and methods, etc. problem, to achieve the effect of excellent selective recognition, fast detection speed, and lower detection limit

Active Publication Date: 2021-09-17
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this solid-based colorimetric functional material mainly adopts physical or chemical methods to convert Cu 2+ and Ag + The detection agent with color recognition function is loaded on the paper substrate to prepare Cu 2+ and Ag + For functional paper with color recognition, when the detection agent is physically loaded on the paper, since the combination of the detection agent and the paper base is a physical combination, the detection agent is easy to fall off, thereby affecting the stability of the detection material. In the prior art, through chemical The material loaded on the paper base solves the problem of material detection stability. Because the chemically loaded detection agent is less, the lower detection limit of the material is higher and the sensitivity is poor.
[0005] In addition, most of the solid substrates currently used, such as glass, silicon oxide, acrylic cellulose, etc., are expensive and have poor plasticity, which is not conducive to subsequent processing applications or portability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Biomass Cellulose-Based Cu 2+ Preparation of test materials

[0029] (1) First put the TEMPO-containing oxidation system (TEMPO / NaBr / NaClO oxidation system) and cellulose in 200mL aqueous solution according to the mass ratio of TEMPO:NaBr:NaClO:cellulose is 1:1:10:20, and the oxidation reaction 0.5h, the reaction temperature is 30°C, and the carboxylated nanocellulose is obtained after high-pressure homogenization.

[0030] (2) Ultrasonic dispersion of carboxylated nanocellulose, and then placed in aqueous solution with polyethyleneimine at 120 ° C for reflux reaction for 5 hours, centrifuged and washed to obtain modified nanocellulose; the carboxylated nanofibers The mass ratio of element, polyethyleneimine and water is 1:2:300.

[0031] (3) Put the modified nanocellulose obtained in step S2 with lysine and water in a mass ratio of 1:4:50 in a flask for reflux reaction at 120°C for 5 hours, and freeze-dry to obtain biomass cellulose Cu-based 2+ Test mate...

Embodiment 2

[0032] Example 2: Biomass Cellulose-Based Cu 2+ Preparation of test materials

[0033] (1) First place the TEMPO-containing oxidation system (TEMPO / NaBr / NaClO oxidation system) and cellulose in a 200mL aqueous solution according to the ratio of TEMPO:NaBr:NaClO:cellulose mass ratio of 1:1:10:20, The oxidation reaction was carried out for 16 hours, the reaction temperature was 60° C., and the carboxylated nanocellulose was obtained after high-pressure homogenization.

[0034] (2) Ultrasonic dispersion of carboxylated nanocellulose, and then placed in aqueous solution with polyethyleneimine at 120 ° C for reflux reaction for 5 hours, centrifuged and washed to obtain modified nanocellulose; the carboxylated nanofibers The mass ratio of element, polyethyleneimine and water is 1:2:300.

[0035](3) Put the modified nanocellulose obtained in step S2 with aspartic acid and water in a mass ratio of 1:4:50 in a flask for reflux reaction at 120°C for 5 hours, and freeze-dry to obtain t...

Embodiment 3

[0036] Example 3: Biomass Cellulose-Based Ag + Preparation of test materials

[0037] (1) First place the TEMPO-containing oxidation system (TEMPO / NaBr / NaClO oxidation system) and cellulose in a 200mL aqueous solution according to the ratio of TEMPO:NaBr:NaClO:cellulose mass ratio of 1:1:10:20, The oxidation reaction was carried out for 24 hours, the reaction temperature was 80° C., and the carboxylated nanocellulose was obtained after high-pressure homogenization.

[0038] (2) Ultrasonic dispersion of carboxylated nanocellulose, and then placed in aqueous solution with polyethyleneimine at 120 ° C for reflux reaction for 5 hours, centrifuged and washed to obtain modified nanocellulose; the carboxylated nanofibers The mass ratio of element, polyethyleneimine and water is 1:2:300.

[0039] (3) Put the modified nanocellulose obtained in step S2 with cysteine ​​and water in a mass ratio of 1:4:50 in a flask for reflux reaction at 120°C for 5 hours, and freeze-dry to obtain biom...

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PUM

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Abstract

The invention discloses a preparation method and application of a biomass cellulose-based detection material. The preparation method comprises the following steps: oxidizing biomass cellulose by adopting an oxidation system containing TEMPO, oxidizing hydroxyl on the cellulose into carboxyl to prepare carboxylated nanocellulose, and grafting polyethyleneimine and amino acid through amidation reaction to prepare the biomass cellulose-based detection material. The material obtained through the method has the advantages of being portable, high in sensitivity and good in stability, has an excellent selective recognition effect on copper ions and silver ions, is not interfered by other heavy metal ions in the detection process, can qualitatively and quantitatively detect Cu < 2 + > or Ag < + >, is suitable for on-site rapid detection, and is free of interference of other heavy metal ions in the detection process, the detection sensitivity of Cu < 2 + > and Ag < + > can reach 10 <-6 > mol / L and 10 <-5 > mol / L respectively. Good application prospects are realized.

Description

technical field [0001] The invention relates to the technical field of heavy metal detection, in particular to a biomass cellulose-based Cu 2+ and Ag + Preparation methods and applications of detection materials. Background technique [0002] The problem of heavy metal pollution has always been the most unresolved problem in water environment treatment. With the continuous development of economy and society, reports on heavy metal pollution are not uncommon in recent years. Not only that, heavy metal ions from industrial wastewater cannot be biodegraded, and are easily enriched in the human body, which can damage human organs and lead to serious diseases. Copper ions in the atmosphere and smoke containing a large amount of copper and its compounds can cause serious damage to the respiratory system. Copper-containing wastewater affects the survival of aquatic organisms, pollutes water quality and soil, and people eat food irrigated by the wastewater will cause heavy metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/285B01J20/24B01J20/30G01N21/78G01N21/01
CPCB01J20/285B01J20/24G01N21/78G01N21/01
Inventor 朱红祥全宗艳周航薛飞何辉王磊
Owner GUANGXI UNIV
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