Microplastic labeled by long-persistence luminescent nano particles, preparation method and application
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A long afterglow luminescence, nanoparticle technology, applied in the field of environmental science, can solve the problem of not finding markers and tracking microplastic particle pollutants, etc., to avoid the interference of autofluorescence, stable luminescence performance, and difficult to quench.
Inactive Publication Date: 2018-09-04
JINAN UNIVERSITY
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At present, relevant reports on long-lasting luminescent nanomaterials focus on biomedical applications such as tumor luminescent imaging and visualized nano drug delivery systems (Adv
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Embodiment 1
[0037] Example 1: Preparation of polystyrene microplastics labeled with green long-lasting luminescent nanoparticles
[0038] (a) The commercially available SrAl 2 o 4 : Mix 10g of Eu, Dy long-lasting phosphor with 1mL oleic acid, and obtain lipophilic SrAl by ball milling and sieving 2 o 4 :Eu,Dy nanoparticles are oleic acid modified SrAl 2 o 4 : Eu, Dy nanoparticles (lipophilic modification can make long-lasting nanoparticles more uniformly dispersed in organic solvents);
[0039] (b) Modification of SrAl with oleic acid 2 o 4 : Eu, Dy nanoparticles are ultrasonically dispersed in 50mL of dichloromethane, left to stand for 24 hours, the precipitate is discarded, and the supernatant is taken to obtain SrAl 2 o 4 : Eu, Dy nanoparticle dispersion, the concentration is about 1-4% (w / v);
[0040] (c) Dissolving 5 g of polystyrene particles in 50 mL of dichloromethane to obtain a 10% (w / v) polystyrene solution;
[0041] (d) the SrAl of step (b) 2 o 4 : Eu, the Dy nanop...
Embodiment 2
[0046] Example 2: Preparation of polystyrene microplastics labeled with red long-lasting luminescent nanoparticles
[0047] The SrAl in embodiment 1 2 o 4 : Replace Eu, Dy with red long afterglow material Y 2 o 2 S: Ti, Mg, Eu (with a particle size of 10nm-100nm), and other steps are the same as in Example 1 to obtain polyethylene microplastics labeled with red long-lasting luminescent nanoparticles.
Embodiment 3
[0048] Example 3: Preparation of polyvinyl chloride microplastics labeled with green long-lasting luminescent nanoparticles
[0049] The polystyrene in Example 1 was replaced with polyvinyl chloride, and the other steps were the same as in Example 1, to obtain green long-lasting luminescent nanoparticle-labeled polyvinyl chloride microplastic particles.
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Abstract
The invention belongs to the technical field of environmental science, and discloses a microplastic labeled by long-persistence luminescent nano particles, a preparation method and application. The method includes the steps that 1, the long-persistence luminescent nano particles are dispersed in organic solvent to obtain long-persistence luminescent nano particles dispersion liquid; 2, plastic macromolecules are dissolved in organic solvent to obtain a plastic macromolecule solution; 3, the long-persistence luminescent nano particles dispersion liquid and the plastic macromolecules solution are evenly mixed to obtain mixed dispersion liquid; 4, under stirring conditions, the mixed dispersion liquid is added into a dispersion medium aqueous solution dropwisely, and after dropwise adding, stirring is continued to obtain dispersion liquid of microplastic particles labeled by the long-persistence luminescent nano particles, or the microplastic particles labeled by the long-persistence luminescent nano particles are separated from the dispersion liquid. The method is simple, the product is stable in structure and good in luminescence performance, no background fluorescence disturbance exists, and the sensitivity is high; the microplastic labeled by the long-persistence luminescent nano particles, the preparation method and the application have potential application values in the fields of environmental effects of microplastics and bioluminescence imaging.
Description
technical field [0001] The invention belongs to the technical field of environmental science, and in particular relates to a microplastic marked with long afterglow luminescent nanoparticles, a preparation method and application thereof. The long-lasting luminescent nano-labeled microplastics are used to qualitatively or quantitatively analyze the distribution, migration, metabolism and enrichment of microplastic pollutants in complex environmental media and organisms, and provide a basis for systematic evaluation of the environmental and ecological risks of various microplastics. New research tools. Background technique [0002] Microplastics generally refer to plastic fragments smaller than 5 mm in size. Microplastics mainly come from the degradation or crushing process of plastic waste and directly synthetic plastic microbead products. Due to the widespread use of plastics, a large amount of microplastics flow into lakes and oceans with surface runoff. On the one hand, ...
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