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Preparation of ferromagnetic nanoparticle and application thereof in extraction and removal of micro-plastics

A technology of ferromagnetic particles and nanoparticles, applied in the field of environmental pollution research, can solve the problems of secondary pollution of microplastics, inability to separate polymers with high density, etc., and achieve the effects of easy removal, environmentally friendly removal, and low cost.

Pending Publication Date: 2019-09-17
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, visual identification is only suitable for plastic particles with larger particle sizes; the density separation method is only suitable for polymers with a density lower than that of the density solution, and cannot separate polymers with higher densities; the chemical digestion method is due to the type of chemicals used and the reaction temperature. Some of them can degrade microplastics; the post-treatment of these methods mostly uses filtration to separate and extract, and these methods are only suitable for separating microplastics larger than a specific pore size (for example: 45 μm), and the fibers in filter paper will bring Secondary pollution of microplastics

Method used

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  • Preparation of ferromagnetic nanoparticle and application thereof in extraction and removal of micro-plastics
  • Preparation of ferromagnetic nanoparticle and application thereof in extraction and removal of micro-plastics
  • Preparation of ferromagnetic nanoparticle and application thereof in extraction and removal of micro-plastics

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: a kind of preparation method of hydrophobic ferromagnetic nanoparticles,

[0033] Such as figure 1 Perform the following steps in sequence as shown:

[0034]1), 1.35g iron trichloride (FeCl3 6H2O) is dissolved in 40ml ethylene glycol (EG), stirs and ultrasonic to dissolve completely; Add 3.6g anhydrous sodium acetate (NaAC) and 4g polyethylene glycol ( PEG) stirred, sonicated until dissolved; heated in a water bath at 60°C, mechanically stirred for 30 minutes, and then sonicated for 1 hour; after the solution was cooled to room temperature, pour the liquid into the reaction kettle, and blast at 200°C for 10 hours; pour off the supernatant from the black magnetic fluid solution, poured into a beaker and naturally settled; washed three times with distilled water and absolute ethanol, poured off the supernatant, and vacuum-dried at 60°C to constant weight to obtain ferromagnetic particles.

[0035] 2), adding 0.08g of ferromagnetic nanoparticles to 50mL of ...

Embodiment 2

[0038] Example 2: Extraction of microplastics in water using hydrophobic ferromagnetic nanoparticles obtained in the above examples

[0039] Add the microplastics to 50 mL of deionized water, add about 0.5 mL of the above-mentioned embodiment to obtain a suspension of hydrophobic iron nanoparticles, stir and mix with a glass rod for 2 min. Add the magnet into the beaker and stir slowly. After the magnetized microplastics are adsorbed on the magnet, take out the magnet. Apply 12V voltage to the magnet to demagnetize the magnet, rinse the magnet with a small amount of distilled water, rinse the microplastics on the magnet to a glass petri dish, and perform visual counting or stereoscopic microscope counting in the glass petri dish.

[0040] According to the method of the above steps, different sizes (large, medium and small) and different types (HDPE (high density polyethylene), LDPE (low density polyethylene), PP (polypropylene), PET (polyester), PVC (polyvinyl chloride) PE (p...

Embodiment 3

[0056] Example 3: Extraction of Microplastics in Sediments Using Hydrophobic Ferromagnetic Nanoparticles Obtained in the Examples Above

[0057] In order to prevent the impact of microplastics in the sediment on the recovery rate of the experiment, the sieved 5mm sediment was placed in a muffle furnace and burned at 450°C for 3h. Weigh 100g of sediment into a beaker, add different types of microplastics, stir evenly with a glass rod, then add 200mL of saturated sodium chloride solution, stir, mix evenly, and settle for 5 minutes. The supernatant was transferred to another beaker, and the remaining small amount of supernatant was transferred with a glass glue tip dropper, and this process was repeated 3 times. Add 2 mL of the hydrophobic iron nanoparticle suspension obtained in the example to the transferred supernatant, and stir and mix with a glass rod for 2 min. Add the magnet into the beaker and stir slowly. After the magnetized microplastics are adsorbed on the magnet, ta...

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Abstract

The invention belongs to the technical field of environmental pollution research and environmental protection technology, and in particular relates to a ferromagnetic nanoparticle and preparation thereof and an application in removal of micro-plastics in the environment based on the nanoparticle. The surface of an iron nanoparticle is modified with methoxysilane to form siloxane bonds (-Si-O-Si-), and alkyl chains face outward to form a hydrophobic iron nanoparticle. The ferromagnetic nanomaterial is applied to extract and remove micro-plastics in an environmental sample. The method has wide adaptability, reliable method, simple operation and relatively low cost, can be used for extracting and identifying micro-plastics in environmental pollution (water, soil, sediment) researches, can be used for removing micro-plastics in environmental water body, sewage, and drinking water, provides a new solution for the micro-plastic environmental pollution field research and the environmental management, and is suitable for further development and application.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution research and the technical field of environmental protection, and specifically relates to a ferromagnetic nanoparticle, its preparation and the application of removing microplastics in the environment based on the nanoparticle. Background technique [0002] Microplastics are a new type of environmental pollutants, which can absorb heavy metals and persistent organic pollutants and migrate and transform in the environment. Due to the small particle size, microplastics are easily ingested by animals, and can release toxic and harmful substances carried by them, which will affect the growth and development, reproduction, and gene expression of organisms. In 2014, the first United Nations Environment Assembly (UNEP1) listed microplastic pollution as one of the top ten global environmental problems to be solved for the first time. In 2015, UNEP2 listed marine microplastics as the secon...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28G01N1/34C02F101/30
CPCB01J20/06B01J20/22B01J20/28009C02F1/288C02F2101/30G01N1/34
Inventor 孙西艳王清滕佳赵建民赵荣芳
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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