Rare earth element qualitative and quantitative detection method based on carbon quantum dot fluorescence mechanism

Abstract

The invention discloses a rare earth element qualitative and quantitative detection method based on a carbon quantum dot fluorescence mechanism and belongs to the field of rare earth element detection. Folic acid for example, a nitrogen-doped carbon quantum dot is synthesized by adopting a one-step hydrothermal method; the synthesized nitrogen-doped carbon quantum dot has an energy band structurewhich has high quantum conversion efficiency and emits blue light; due to the surface electronegativity, the synthesized nitrogen-doped carbon quantum dot can be well combined with positively chargedrare earth ions; a prepared nitrogen-doped carbon quantum dot solution can be combined with different types of rare earth; fluorescence spectral lines emitted by the synthesized nitrogen-doped carbonquantum dots are subjected to red shift and quenching; the content of the rare earth can be quantitatively analyzed through the change of fluorescence quenching; the red shift phenomenon can be applied to qualitative distinguishing of the rare earths; therefore, the rare earths can be divided into two types, the first group of rare earth ions Y < 3 + >, La < 3 + >, Lu < 3 + > and NCDs are combinedto enable the fluorescence emission peak of the NCDs to have obvious red shift, and the second type of rare earth ions Pr < 3 + >, Nd < 3 + >, Sm < 3 + >, Eu < 3 + >, Gd < 3 + >, Tb < 3 + > and Dy <3 + > have no similar phenomenon.

Description

technical field [0001] The invention belongs to the field of rare earth element detection, in particular to a qualitative and quantitative detection method of rare earth elements based on a carbon quantum dot fluorescence mechanism. Background technique [0002] Rare earth elements include No. 21 scandium element, No. 39 yttrium element and No. 57-71 lanthanide elements in the periodic table of elements. Known as the "mother of new materials" and "industrial vitamins", rare earth elements are very important strategic elements in the 21st century. Rare earth elements have become an indispensable resource for our country's economic development. Rare earth elements are used in medicine, life It is widely used in science, magnetic resonance imaging (MRI), renewable energy, energy storage, new laser materials, new energy, and optical devices. Due to the low concentration of REEs in the earth's crust, the mining, extraction, and purification of REEs need to solve many problems in...

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Problems solved by technology

Commonly used methods for the detection of rare earth ions include X-ray fluorescence spectroscopy, inductively coupled plasma atomic emission spectrometry, and inductively coupled plasma mass spectrometry. Among them, ICP-MS is the most common method, but it is inconvenient to operate and relatively expensive.

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