Dialdehyde cellulose-based Schiff base fluorescent probe for detecting Al <3+>, and preparation method and application thereof

Abstract

The invention discloses a dialdehyde cellulose-based Schiff base fluorescent probe for detecting Al<3+>, and a preparation method and application thereof. The preparation method comprises the following steps: by taking dialdehyde cellulose as a raw material, carrying out condensation on dialdehyde cellulose and sebacic dihydrazide to prepare dialdehyde cellulose-sebacic dihydrazide mono-Schiff base; and further carrying out condensation on the dialdehyde cellulose-sebacic dihydrazide mono-Schiff base and 2-hydroxy-1-naphthaldehyde, so as to prepare the dialdehyde cellulose-sebacic dihydrazide 2-hydroxy-1-naphthaldehyde bis-Schiff base. Under the irradiation of 365 nm ultraviolet light, after Al<3+> is added into a DMF suspension of dialdehyde cellulose-sebacic hydrazide-2-hydroxy-1-naphthaldehyde bis-Schiff base, the fluorescence color of the solution is changed from colorless to blue, the detection limit of Al<3+> reaches 6.06 * 10<-7> M, and the fluorescent probe for detecting Al<3+> ions has a good application prospect as a fluorescent probe for detecting Al<3+> ions.

Description

technical field [0001] The invention belongs to the technical field of fluorescence detection, and relates to a method for detecting Al 3+ The dialdehyde cellulose-based Schiff base fluorescent probe and its preparation method and application. Background technique [0002] Cellulose is the most widely distributed and most abundant natural polymer in nature. Each glucosyl ring of cellulose contains 3 hydroxyl groups, and these 3 hydroxyl groups can undergo reactions such as oxidation, etherification, crosslinking, and esterification, so as to realize the functional modification and application of cellulose, and endow cellulose with new performance. Periodate can oxidize the ortho hydroxyl groups at the C2 and C3 positions on cellulose to aldehyde groups, thereby obtaining dialdehyde cellulose. 2-Hydroxy-1-naphthaldehyde is one of the most widely used fluorophores, and it is often used to synthesize excellent precursors for different fluorescent chemical sensors. It is graf...

AI Technical Summary

Problems solved by technology

2-Hydroxy-1-naphthaldehyde is one of the most widely used fluorophores, and it is often used to synthesize excellent precursors for different fluorescent chemical sensors. It is grafted onto dialdehyde cellulose macromolecules to obtain dialdehyde cellulose base Fluorescent materials, which not only have the excellent properties of dialdehyde cellulose polymer itself, but also overcome many limitations of small molecule fluorescent compounds: such as easy aggregation leading to fluorescence quenching; difficult to reuse; fluorescent small molecules are difficult to process, Cannot be used in the manufacture of devices, etc.

Currently, Al 3+ The detection methods mainly include electrochemical method, chemical titration method, spectrophotometric method, etc. Due to many limitations, these technologies lead to defects such as cumbersome operation, insufficient practicability, and low sensitivity.

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