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A surface-modified magnetic nanoparticle, preparation method, application and regeneration method

A magnetic nanoparticle and surface modification technology, which is applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of strong corrosion of oily wastewater, destroying the ecological balance of water, polluting groundwater sources, etc., and achieves a simple regeneration method. Easy to operate, realize recycling and short adsorption time

Active Publication Date: 2020-10-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These oily wastewater are highly corrosive and easy to scale. If reinjected, the water injection layer will be blocked; if discharged, crude oil will form a thin oil film on the water surface, causing a sharp drop in dissolved oxygen in the water, destroying the ecological balance of the water, and polluting the groundwater source.

Method used

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  • A surface-modified magnetic nanoparticle, preparation method, application and regeneration method
  • A surface-modified magnetic nanoparticle, preparation method, application and regeneration method
  • A surface-modified magnetic nanoparticle, preparation method, application and regeneration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation of the magnetic nanoparticle of embodiment 1 surface modification

[0036] This embodiment provides a preparation of surface-modified magnetic nanoparticles, including:

[0037] (1) with ferrous chloride and ferric chloride as iron source, the aqueous solution containing 0.02mol ferrous chloride and 0.04mmol ferric chloride is mixed;

[0038] (2) Add a 40% ammonia solution dropwise to the solution under mechanical stirring until the pH value of the solution is stable at 12. The resulting mixture was placed in a water bath, the temperature of the water bath was 70° C., and the time of the water bath was 2 hours. After the water bath, the precipitate was centrifuged and washed several times with pure water to obtain magnetic nanoparticles;

[0039] (3) continue to disperse the precipitate in 100g water, and add 2.82g oleic acid to the water, add the 10g aqueous solution that has dissolved 0.8gNaOH in the stirring process, after standing for a period of t...

Embodiment 2

[0043] The preparation of the cobalt ferrite particle of embodiment 2 surface modification

[0044] This embodiment provides a preparation of surface-modified cobalt ferrite particles, including:

[0045] (1) adopt ferrous chloride and ferric chloride as iron source, will contain the aqueous solution of 0.1mol cobalt chloride and 0.2mmol ferric nitrate to mix;

[0046] (2) Add a 40% ammonia solution dropwise to the solution under mechanical stirring until the pH value of the solution is stable at 12. The resulting mixture was placed in a water bath, the temperature of the water bath was 90° C., and the time of the water bath was 4 hours. After the water bath, the precipitate was centrifuged and washed several times with pure water to obtain magnetic nanoparticles;

[0047] (3) Continue to disperse the precipitate in 200g water, and add 5.64g oleic acid to the water, add 20g aqueous solution in which 2gNaOH has been dissolved in the stirring process, and after standing for a ...

Embodiment 3 4

[0049] Example 3 The oil-water separation effect and recycling of ferric oxide particle adsorbent

[0050] This embodiment provides an oil-water separation effect and a recycling method of the magnetic nanoparticles obtained in Embodiment 1, including:

[0051] Oil-water separation: Disperse 0.2 g of the surface-modified ferroferromagnetic ferric oxide described in Example 1 in 10 g of water, pour the mixed solution into 20 g of oil-water mixture containing 10% crude oil, and mix the two under the action of mechanical stirring uniform. After standing for a period of time, the magnetic nanoparticles are aggregated with a magnet and separated from the solution. It can be seen that the previously brown oil-water mixture became clear after being adsorbed by the magnetic adsorbent.

[0052] Recycling: Disperse the magnetic nanoparticles adsorbed with crude oil in 10g of n-hexane solution, and add 10g of pure water, it can be seen that the crude oil is evenly dispersed in the n-he...

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Abstract

The invention relates to surface modified magnetic nanoparticles, a preparation method, an application and a regeneration method. The preparation method of the surface modified magnetic nanoparticlescomprises the following steps: (1) a bivalent magnetic transition metal source and a trivalent iron source are dissolved in water, and a mixed solution is obtained; (2) ammonia water is added to the mixed solution until pH of the system is 11-14, coprecipitation, water bath aging, centrifugal separation and washing are preformed, and magnetic nanoparticles are obtained; (3) the obtained magnetic nanoparticles are dispersed in water, oleic acid and alkali liquor are added, the mixed solution is left to stand and subjected to an in-situ reaction, a solid product is separated out from the systemby magnets, and the surface modified magnetic nanoparticles are obtained. The surface modified magnetic nanoparticles can be used for oil-water separation and can be recycled after oil-water separation. The preparation method is simple, the adsorption effect is good, the preparation cost is low, industrial production is easy to realize, and the surface modified magnetic nanoparticles can be used for separation and purification of oily water in oil extraction, production and living.

Description

technical field [0001] The invention relates to the technical field of magnetic nanoparticle preparation and surface modification, in particular to a preparation method of magnetic nanoparticle surface-modified with oleate groups and its application in the field of oil-water separation. Background technique [0002] Crude oil extraction, industrial production and people's daily life will discharge a large amount of oily wastewater. On the one hand, this oily wastewater has caused water pollution, and on the other hand, it has also caused a lot of waste of resources. Taking crude oil production as an example, from 2012 to 2016, China's annual output of crude oil was about 140 million tons, and oil fields produced nearly 2 billion tons of oily sewage annually. These oily wastewaters are highly corrosive and easy to scale. If they are reinjected, they will block the water injection layer; if they are discharged, crude oil will form a thin oil film on the water surface, causing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/34B01J20/30C02F1/28C02F1/40
CPCB01J20/22B01J20/28007B01J20/28009B01J20/28011B01J20/3425C02F1/288C02F1/40C02F2303/16
Inventor 刘荣正刘马林常家兴
Owner TSINGHUA UNIV
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