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A modified magnetic nano silica and its application in oil-water separation

A silicon dioxide, magnetic nanotechnology, applied in separation methods, liquid separation, magnetic field/electric field water/sewage treatment, etc., can solve problems such as unfavorable oil-water separation, difficulty in particle recycling, and secondary environmental pollution

Active Publication Date: 2019-11-29
山东凤鸣桓宇环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many unsolved problems in the application of granular Pickering emulsifiers to complex oily wastewater systems for oil-water separation. The main problems in current research are: (1) The structure of granular Pickering emulsifiers has a greater impact on the Pickering emulsification performance. The development of Pickering granular emulsifiers with controllable structure and morphology is the primary problem at present; (2) For the efficient treatment of oily wastewater in a similar emulsified state, it is still a difficult problem when granular emulsifiers are used for oil-water separation; (3) How to convert emulsified oil droplets in oily wastewater into super-stable Pickering emulsion droplets more controllably is a key problem to be solved for oil-water separation using particle emulsifiers
There are also some other problems, such as how to realize particle recovery and reuse. The existence of these problems will lead to poor emulsification performance of conventional Pickering emulsifier particles in practical applications, which is not conducive to oil-water separation, difficulty in particle recycling, and environmental pollution. The problem of secondary pollution, thus limiting the application of granular Pickering emulsifiers in oily wastewater treatment

Method used

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  • A modified magnetic nano silica and its application in oil-water separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A novel modified magnetic nano-silica particle is prepared by the following method:

[0075] (1) Disperse 20g of magnetic nano-silica with a particle size of 90nm in 500ml of anhydrous toluene, add 100g of aminopropyltriethoxysilane, fill it with nitrogen and heat to boiling, then reflux at a constant temperature (105°C) for 48h , and then successively washed with anhydrous toluene and anhydrous acetone, and vacuum-dried to obtain aminated magnetic nano-silica;

[0076] (2) Disperse 10g of aminated magnetic nano-silica in 50g of paraffin at 75°C, then add 500mL of deionized water, stir rapidly at 1600rpm for 1h, and then cool the system to room temperature. The paraffin solid particles were washed 10 times with deionized water, and the magnetic nano-silica particles that were not attached or loosely attached to the paraffin were removed to obtain aminated magnetic nano-silica paraffin balls.

[0077] (3) Disperse 25g of aminated magnetic nano-silica paraffin balls in 5...

Embodiment 2

[0086] A modified magnetic nano-silica particle, prepared by the following method:

[0087] (1) Disperse 20g of magnetic nano-silica with a particle size of 90nm in 500ml of anhydrous toluene, add 100g of aminopropyltriethoxysilane, heat to boiling after filling with nitrogen, and then reflux at a constant temperature (105°C) for 48h, Then wash with anhydrous toluene and anhydrous acetone successively, and vacuum-dry to obtain aminated magnetic nano silicon dioxide;

[0088] (2) Disperse 10g of aminated magnetic nano-silica in 50g of paraffin at 75°C, then add 500mL of deionized water, stir rapidly at 1600rpm for 1h, and then cool the system to room temperature. The paraffin solid particles were washed 10 times with deionized water, and the magnetic nano-silica particles that were not attached or loosely attached to the paraffin were removed to obtain aminated magnetic nano-silica paraffin balls.

[0089] (3) Disperse 25g of aminated magnetic nano-silica paraffin balls in 500...

Embodiment 3

[0095] A modified magnetic nano-silica particle, prepared by the following method:

[0096] (1) Disperse 20g of magnetic nano-silica with a particle size of 90nm in 500ml of anhydrous toluene, add 100g of aminopropyltriethoxysilane, heat to boiling after filling with nitrogen, and then reflux at a constant temperature (105°C) for 48h, Then wash with anhydrous toluene and anhydrous acetone successively, and vacuum-dry to obtain aminated magnetic nano silicon dioxide;

[0097] (2) Disperse 10g of aminated magnetic nano-silica in 50g of paraffin at 75°C, then add 500mL of deionized water, stir rapidly at 1600rpm for 1h, and then cool the system to room temperature. The paraffin solid particles were washed 10 times with deionized water, and the magnetic nano-silica particles that were not attached or loosely attached to the paraffin were removed to obtain aminated magnetic nano-silica paraffin balls.

[0098] (3) Disperse 25g of aminated magnetic nano-silica paraffin balls in 500...

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Abstract

The invention discloses modified magnetic nano-silica and application thereof in oil-water separation. The modified magnetic nano-silica is prepared by the following steps: reacting magnetic nano-silica with an amino silane coupling agent, so as to obtain aminated magnetic nano-silica; dispersing aminated magnetic nano-silica into paraffin, and stirring, so as to obtain aminated magnetic nano-silica paraffin sphere; adding an acid capture agent, dropwise adding bromo-alkyl acyl bromide or bromo-alkyl acyl chloride under an ice-water bath condition, and reacting, so as to obtain a magnetic nano-silica initiator; mixing the magnetic nano-silica initiator with monomers, cuprous bromide, ligand and a solvent, carrying out deoxygenization, and reacting, so as to obtain polymer partially-modified magnetic nano-silica; slowly dropwise adding polymer partially-modified magnetic nano-silica into a poly(glyceryl methacrylate) solution, and reacting, so as to obtain polymer-modified magnetic nano-silica; and finally, dropwise adding polymer-modified magnetic nano-silica into a polyethyleneimine solution, and stirring to react, so as to obtain modified magnetic nano-silica. A modified magnetic nano-silica particle has very good stability, emulsified oil separation performance and recoverability.

Description

technical field [0001] The invention belongs to the field of organic / inorganic hybrid materials, and specifically relates to a modified magnetic nano-silica, that is, a polymer asymmetrically grafted modified magnetic nano-silica particle with the functions of flocculating oil droplets and pickering emulsification. And its application in the separation of complex oily wastewater. Background technique [0002] Various pollutants produced by human production activities can cause water pollution when they enter the water body, and oily pollutants enter the water body to form oily wastewater. Oily wastewater will not only damage the ecological environment of the water body, but also destroy the ecological environment of the surrounding soil or land, thereby endangering the health of humans or animals, causing great environmental and social harm. [0003] The types of oil in oily wastewater are complex, and the oil exists in various forms in the water body. It can exist in vario...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F220/22C08F285/00C08F220/32C08G81/02C02F1/56C02F1/48C02F1/40
CPCC02F1/40C02F1/48C02F1/56C08F285/00C08F292/00C08G81/024C08F220/22C08F220/325
Inventor 张干伟白仁碧周鸣天刘秋希陈义杰陈雪史晨博
Owner 山东凤鸣桓宇环保有限公司
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