A quantum dot fluorescent material for detecting heavy metal ions and its preparation method

Abstract

The invention provides a quantum dot fluorescent material for detecting heavy metal ions and a preparation method thereof. The quantum dot fluorescent material includes quantum dots and a mercapto-containing organic acid ligand, and the mercapto-containing organic acid ligand is attached to The quantum dot surface, the quantum dot is a core-shell structure; the preparation method of the quantum dot fluorescent material comprises: replacing the oil phase ligand on the quantum dot surface of the core-shell structure with an organic acid containing a mercapto group by means of surface ligand replacement ligand to obtain the quantum dot fluorescent material; the quantum dot fluorescent material can be used to detect heavy metal ions in wastewater.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a quantum dot fluorescent material for detecting heavy metal ions and a preparation method thereof. Background technique [0002] With the development of industry and agriculture, sewage discharge has increased, and a large number of heavy metal ion pollutants have entered the water body, which is one of the main environmental pollutants. Heavy metal ions can be enriched to organisms through the food chain, and are particularly easy to accumulate in the human body, endangering people's health. Therefore, rapid and sensitive detection of heavy metal ions in the environment and water is becoming more and more important. The traditional heavy metal ion detection can be mainly through atomic fluorescence spectrometry, electrochemical method, inductively coupled plasma mass spectrometry and so on. Atomic fluorescence spectrometry is to measure the content of the element to be me...

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Problems solved by technology

The quantum dots prepared by this method can detect heavy metal ions in cells in situ, but it is not disclosed that it can detect heavy metal ions in sewage

[0004] CN106893580A discloses a polymer quantum dot that can detect heavy metal ions. The polymer quantum dot is based on the principle that amino groups and mercapto groups coordinate metal ions to quench or enhance the fluorescence of the polymer quantum dot. High-temperature hydrothermal synthesis method, the polymer has low biotoxicity, small size, strong luminescence, and is resistant to heavy metal ions Hg 2+ 、Cu 2+ 、Cr 6+ and Ag + etc. have high selectivity and sensitivity, but its luminescence stability needs to be improved

The fluorescent spectrophotometer equipment cost of detecting the fluorescent spectrum by the method of the present invention is relatively low, and does not need cumbersome processing; the carbon nanoparticles in the carbon quantum dot fluorescent probe used have good kinetics and thermodynamic properties, and physical and chemical stability , good water solubility, high light resistance, diverse surface properties, easy chemical modification to form functional and environmentally friendly carbon nanoparticles; the prepared carbon quantum dots do not contain heavy metals; have good sensitivity to trace trivalent arsenic, But there is no mention of detecting heavy metal ions other than arsenic

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