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Modified nano-silica, PVDF micro-filtration membrane and application of PVDF micro-filtration membrane

A nano-silica, silica technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve problems such as membrane pollution and unfavorable practical application.

Active Publication Date: 2017-09-26
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing research results show that polymer membranes have unique advantages in oil-water separation, but there are still some problems: (1) Early studies directly used conventional ultrafiltration membranes to treat oily wastewater, and the membrane flux and effluent quality were stable and the effect was good. However, oil and other organic components in oily wastewater can easily cause membrane fouling.
However, most of the reported microporous membranes have a pore size above 30 μm. Although a large pore size can reduce the fluid resistance and increase the membrane flux, the corresponding decrease in the transmembrane pressure difference means that the height of the liquid column above the membrane surface must be controlled. Below a few centimeters, this is very unfavorable for practical applications

Method used

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  • Modified nano-silica, PVDF micro-filtration membrane and application of PVDF micro-filtration membrane
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  • Modified nano-silica, PVDF micro-filtration membrane and application of PVDF micro-filtration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0071] A modified nano silicon dioxide, prepared by the following method:

[0072] (1) Disperse 20g of silicon dioxide with a particle size of 90nm in 500ml of anhydrous toluene, add 100g of aminopropyltriethoxysilane, fill with nitrogen and heat to boiling, then reflux at constant temperature (105°C) for 48h, and then sequentially Wash with anhydrous toluene and anhydrous acetone, and dry in vacuum to obtain aminated nano-silica;

[0073] (2) Disperse 10g of aminated 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. Wash the paraffin wax solid particles 10 times with deionized water, remove the nano-silica particles that are not attached or loosely attached to the paraffin, and obtain paraffin balls whose surface is covered with aminated nano-silica.

[0074] (3) Disperse 25 g of paraffin balls covered with aminated nano-silica in 500 ml of anhydrous xylene, add 25 g of tri...

Embodiment 2

[0084] A modified nano silicon dioxide, prepared by the following method:

[0085] (1) Disperse 20g of silicon dioxide with a particle size of 300nm in 500ml of anhydrous toluene, add 80g of aminopropyltriethoxysilane, heat to boiling after filling with nitrogen, then reflux at constant temperature (105°C) for 48h, and then Wash with anhydrous toluene and anhydrous acetone, and dry in vacuum to obtain aminated nano-silica;

[0086] (2) Disperse 10g of aminated 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. Wash the paraffin wax solid particles 10 times with deionized water, remove the nano-silica particles that are not attached or loosely attached to the paraffin, and obtain paraffin balls whose surface is covered with aminated nano-silica.

[0087] (3) Disperse 25 g of paraffin balls covered with aminated nano-silica in 500 ml of anhydrous xylene, add 25 g of triethylami...

Embodiment 3

[0097] A modified nano silicon dioxide, prepared by the following method:

[0098] (1) Disperse 20g of silicon dioxide with a particle size of 1100nm in 500ml of anhydrous toluene, add 80g of aminopropyltriethoxysilane, fill with nitrogen and heat to boiling, then reflux at constant temperature (105°C) for 48h, and then sequentially Wash with anhydrous toluene and anhydrous acetone, and dry in vacuum to obtain aminated silicon dioxide;

[0099] (2) Disperse 10g of aminated 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. Wash the paraffin wax solid particles 10 times with deionized water, remove the nano-silica particles that are not attached or loosely attached to the paraffin, and obtain paraffin balls whose surface is covered with aminated nano-silica.

[0100] (3) Disperse 25 g of paraffin balls covered with aminated nano-silica in 500 ml of anhydrous xylene, add 25 g o...

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Abstract

The invention discloses modified nano-silica, a PVDF micro-filtration membrane and application of the PVDF micro-filtration membrane. A preparation method of the modified nano-silica comprises the following steps: at first, enabling reaction between nano-silica and an amino silane coupling agent to prepare aminated silica; adding paraffin to prepare paraffin balls of which the surfaces are covered with aminated silica; adding an acid capture agent, and dripping brominated alkyl acyl bromide or brominated alkyl acyl chloride under an ice-water bath condition to obtain a silica initiator; adding a monomer, cuprous bromide and aglucon, and enabling reaction to obtain polymer-grafted silica; and dispersing the product in an alpha-methoxy-omega-carboxyl polyethylene glycol solution, and performing stirring for reaction to obtain the modified nano-silica. Polymer chain segments, easily miscible with PVDF, on the surfaces of the modified nano-silica can fix the nano-silica particles after film forming, so that the stability of a micro-nanostructure on the surface of a film is enhanced, and the hydrophilic modified micro-filtration membrane has very good durability.

Description

technical field [0001] The invention belongs to the field of polymer membrane materials, and specifically relates to a novel modified nano silicon dioxide, a microfiltration membrane prepared by the modified nano silicon dioxide, and the application of the microfiltration membrane in high-efficiency oil-water separation. Background technique [0002] Oily wastewater is formed when oil enters the water environment through different channels. Oily wastewater not only damages the ecological environment of the water body, but also destroys the ecological environment of the surrounding soil or land, thereby endangering the health of humans or animals, thus causing great environmental and social harm. Therefore, effective treatment of oily wastewater to alleviate the harm of oily wastewater to the ecological environment and society has become a hot spot in water treatment research. [0003] A variety of oily wastewater treatment methods have been reported, including oil skimming,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B01D71/34B01D67/00B01D61/14B01D17/022C02F1/40C02F1/44
CPCB01D17/02B01D61/147B01D67/0002B01D71/34C02F1/40C02F1/444C08G83/001
Inventor 张干伟白仁碧沈舒苏周晓吉邓扬
Owner SUZHOU UNIV OF SCI & TECH
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