Polymer hybrid grafted nano silica and PVDF microfiltration membrane and its application

A nano-silica, silica technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of membrane pollution, unfavorable practical application, etc., achieve simple modification process, enhance surface wetting characteristics, The effect of high-efficiency oil-water separation performance

Active Publication Date: 2019-11-29
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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  • Polymer hybrid grafted nano silica and PVDF microfiltration membrane and its application
  • Polymer hybrid grafted nano silica and PVDF microfiltration membrane and its application
  • Polymer hybrid grafted nano silica and PVDF microfiltration membrane and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0067] A polymer hybrid grafted nano silica, prepared by the following method:

[0068] (1) Disperse 20g of silica 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 a constant temperature (105°C) for 48h, and then sequentially Wash with anhydrous toluene, anhydrous acetone, and vacuum dry to obtain aminated silica;

[0069] (2) Disperse 20 g of surface aminated silica in 500 ml of anhydrous xylene, add 15 g of triethylamine, and drop 5 g of 2-bromoisobutyryl bromide in an ice-water bath. Cancel the ice-water bath, let the system naturally heat up to 25°C for 4h, then wash the product with methanol precipitation and vacuum dry to obtain brominated silica;

[0070] (3) Disperse 20 g of brominated silica in 500 ml of N,N-dimethylformamide solution, add 2 g of sodium azide, and stir at 20-30°C for 24 hours. The product is precipitated, washed, and dried in vacuum to obtain silica az...

Embodiment 2

[0079] A polymer hybrid grafted nano silica, prepared by the following method:

[0080] (1) Disperse 20g of silica with a particle size of 250nm in 500ml of anhydrous toluene, add 100g of aminopropyltriethoxysilane, fill with nitrogen and heat to boiling, then reflux at a constant temperature (105°C) for 48h, and then sequentially Wash with anhydrous toluene, anhydrous acetone, and vacuum dry to obtain aminated silica;

[0081] (2) Disperse 20 g of aminated silica in 500 ml of anhydrous xylene, add 15 g of triethylamine, and drop 5 g of 2-bromoisobutyryl bromide in an ice-water bath. Cancel the ice-water bath, let the system naturally heat up to 25°C for 4h, then wash the product with methanol precipitation and vacuum dry to obtain brominated silica;

[0082] (3) Disperse 20 g of brominated silica in 500 ml of N,N-dimethylformamide solution, add 2 g of sodium azide, and stir for 24 hours at 20-30°C. The product is precipitated, washed, and dried in vacuum to obtain silica azide.

[...

Embodiment 3

[0090] A polymer hybrid grafted nano silica, prepared by the following method:

[0091] (1) Disperse 20g of silica with a particle size of 350nm in 500ml of anhydrous toluene, add 80g of aminopropyltriethoxysilane, fill with nitrogen and heat to boiling, then reflux at a constant temperature (105°C) for 48h, and then sequentially Wash with anhydrous toluene, anhydrous acetone, and vacuum dry to obtain aminated silica;

[0092] (2) Disperse 20 g of aminated silica in 500 ml of anhydrous xylene, add 10 g of triethylamine, and drop 3 g of 2-bromoisobutyryl bromide in an ice-water bath. Cancel the ice-water bath, let the system naturally heat up to 25°C for 4h, then wash the product with methanol precipitation and vacuum dry to obtain brominated silica;

[0093] (3) Disperse 20 g of brominated silica in 500 ml of N,N-dimethylformamide solution, add 2 g of sodium azide, and stir for 24 hours at 20-30°C. The product is precipitated, washed, and dried in vacuum to obtain silica azide.

[0...

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Abstract

The invention discloses polymer mixed type grafted nano silicon dioxide, a PVDF (Polyvinylidene Fluoride) microfiltration membrane and application thereof. A preparation method of the silicon dioxide comprises the following steps: taking nano silicon dioxide and an amino silane coupling agent to react to obtain amino silicon dioxide; adding an acid capturing agent; dropwise adding bromoalkylacyl bromide under an ice water bath condition; after reacting, obtaining bromo silicon dioxide; adding sodium azide and reacting to obtain silicon dioxide azide; finally, adding a mixture of an alkynyl-containing hydrophilic polymer and an alkynyl-containing hydrophobic polymer, copper sulfate and sodium ascorbate; reacting to prepare the polymer mixed type grafted nano silicon dioxide. Polymer chain segments easy to mix with the PVDF on the surfaces of modified silicon dioxide particles can fix silicon dioxide after film formation, so that the obtained hydrophilic modified microfiltration membrane has very good durability; furthermore, the modified silicon dioxide enables a polymer membrane to automatically form an asymmetric structure in an oil-containing wastewater treatment process, so that the polymer membrane has an efficient oil-water separation performance.

Description

Technical field [0001] The invention belongs to the field of polymer membrane materials, and specifically relates to a polymer hybrid grafted nano silica, and a modified PVDF membrane prepared by the polymer hybrid grafted nano silica and its application in oil-water separation . Background technique [0002] Oily wastewater is formed when oil enters the water environment through different channels. Oily wastewater not only destroys 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, thereby 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 hotspot in water treatment research. [0003] A variety of oily wastewater treatment methods have been reported, including skimming, adsorption, gravity, flocculation, biological me...

Claims

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Application Information

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Patent Type & Authority Patents(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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