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Preparation method of non-toxic nanoscale plastic microparticles

A nano-scale, non-toxic technology, applied in the field of environmental materials, can solve problems such as interference with toxicology experiments

Inactive Publication Date: 2021-01-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no industrialized production of nano-PET plastics at present, chemical surfactants such as sodium dodecyl sulfate (SDS) are often used in the process of preparing nano-PET plastics in the laboratory. The toxicity of the reagent itself will interfere with subsequent toxicology experiments. Therefore, the development and operation A simple and non-biotoxic method for preparing nano-PET plastics is very necessary

Method used

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  • Preparation method of non-toxic nanoscale plastic microparticles
  • Preparation method of non-toxic nanoscale plastic microparticles
  • Preparation method of non-toxic nanoscale plastic microparticles

Examples

Experimental program
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Effect test

example 1

[0022] Weigh 1g of PET powder and place it in a 100mL round bottom flask, add 10mL of 90% sulfuric acid aqueous solution, stir until completely dissolved, add 10mL of 20% sulfuric acid solution while stirring, continue stirring for 2h after cooling to room temperature, and transfer the suspension into a 50mL centrifuge tube, centrifuge at 2800g for 1h, transfer the upper layer of PET plastic to another centrifuge tube, and centrifuge and wash 5 times. At this time, the pH of the solution is measured to be 7. Dissolve lipid in 100mL pure water, add 25mL rhamnolipid solution to the centrifuge tube containing the precipitate, sonicate for 20min, vibrate at 180r / min for 20min, let stand for 48h, take the upper layer suspension and sonicate for 1h, take 1.5mL to use nanometer particle size Analyze its particle size with zeta potential molecular weight analyzer, the result is as follows figure 1 As shown, the measured particle size distribution is 295-615nm.

example 2

[0024] Weigh 1g of PET powder and place it in a 100mL round bottom flask, add 10mL of 90% sulfuric acid aqueous solution by volume, stir until completely dissolved, then add 10mL of 10% sulfuric acid solution while stirring, continue to stir for 2h after cooling to room temperature, and transfer the suspension into a 50mL centrifuge tube, centrifuge at 2800g for 1h, transfer the upper layer of PET plastic to another centrifuge tube, and centrifuge for 4 times. At this time, the pH of the solution is measured to be 7. Transfer the precipitate to a 50mL centrifuge tube. Dissolve lipid in 100mL pure water, add 25mL rhamnolipid solution to the centrifuge tube containing the precipitate, sonicate for 20min, vibrate at 180r / min for 20min, let stand for 48h, take the upper layer suspension and sonicate for 1h, take 1.5mL to use nanometer particle size Analyze its particle size with zeta potential molecular weight analyzer, the result is as follows figure 2 As shown, the measured par...

example 3

[0026] Weigh 1g of PET powder into a 100mL round bottom flask, add 10mL of sulfuric acid aqueous solution with a volume fraction of 85%, stir until completely dissolved, add 10mL of 10% sulfuric acid solution while stirring, continue stirring for 2h after cooling to room temperature, and transfer the suspension into a 50mL centrifuge tube, centrifuge at 2800g for 1h, transfer the upper layer of PET plastic to another centrifuge tube, and centrifuge and wash 5 times. At this time, the pH of the solution is measured to be 7. Dissolve lipid in 100mL pure water, add 25mL rhamnolipid solution to the centrifuge tube containing the precipitate, sonicate for 20min, vibrate at 180r / min for 20min, let stand for 48h, take the upper layer suspension and sonicate for 1h, take 1.5mL to use nanometer particle size Analyze its particle size with zeta potential molecular weight analyzer, the result is as follows image 3 As shown, the measured particle size distribution is 91-142nm.

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Abstract

The invention discloses a preparation method of non-toxic nanoscale plastic microparticles. The method comprises the following steps of: dissolving plastic in a high-concentration sulfuric acid aqueous solution, adding a low-concentration sulfuric acid solution to separate out small-particle plastic, stirring at a high speed to prevent plastic particles from forming flocculent precipitate, addinga biological surfactant to prevent plastic nanoparticles from agglomerating and precipitating, standing, and taking the supernatant to obtain nanoscale particles. The method is suitable for plastics soluble in an aqueous solution of concentrated sulfuric acid, preferably polyethylene terephthalate (PET); a safe and non-toxic biological surfactant is used, so that the problem that the result is interfered by excessive toxicity of the surfactant in a subsequent biotoxicology experiment is avoided; sulfuric acid is used as a solvent to greatly reduce the dissolving time; and the method is simpleto operate, does not need heating, and does not use volatile toxic chemicals as solvents.

Description

technical field [0001] The invention relates to the field of environmental materials, in particular to a method for preparing materials required for quantitative detection and toxicological analysis of nano-plastic particles. Background technique [0002] Plastics are widely used in modern life and production, and the derived microplastics and nanoplastics have been proven to accumulate in various environmental media. Nanoplastics are a global pollution problem. The negative impact of nanoplastics on the ecosystem and the toxicological effects on organisms are the research hotspots in the current academic circle. At present, the most widely studied toxicological effects are polystyrene (PS) plastics that can be industrially produced. Studies have found that due to the extremely small diameter and high cell adsorption of nanoplastics, PS nanoplastics have significant toxicological effects on zebrafish and other organisms. The effect, in vitro, was evident on lung cell lines....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 汪磊张抒意唐雪娇
Owner NANKAI UNIV
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