Preparation method and application of biomass cellulose-based detection material

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...

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.