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Nano TiO2-modified PEO/PVDF composite ultra-filtration membrane and preparation method thereof

A kind of ultrafiltration membrane and nanotechnology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of weak anti-pollution ability, strong hydrophobicity, low water flux, etc., and achieve improved water purification efficiency and hydrophilic The effect of improving performance and increasing water flow

Inactive Publication Date: 2017-11-24
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a nano-TiO 2 The modified PEO / PVDF composite ultrafiltration membrane can effectively solve the problems of low water flux, strong hydrophobicity, and weak anti-pollution ability of the existing PVDF ultrafiltration membrane, and its preparation method is disclosed

Method used

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  • Nano TiO2-modified PEO/PVDF composite ultra-filtration membrane and preparation method thereof
  • Nano TiO2-modified PEO/PVDF composite ultra-filtration membrane and preparation method thereof
  • Nano TiO2-modified PEO/PVDF composite ultra-filtration membrane and preparation method thereof

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Effect test

Embodiment 1

[0027] A preparation method of pure PVDF ultrafiltration membrane, comprising the following steps:

[0028] (1) Add 1.0 g of dichloromethane, 5.4 g of acetone, and 3.6 g of N,N-dimethylacetamide into a glass bottle with a lid to make a mixed solvent, then add 1.5 g of PVDF powder, and put Put it into the magnet, cover the lid, put it in a constant temperature water bath magnet stirrer at a constant temperature of 50°C and stir for 2 hours. After stirring, take it out and let it stand for defoaming to obtain pure PVDF spinning solution.

[0029] (2) Take a 10ml syringe, absorb N,N-dimethylacetamide to clean the syringe, and draw more than 5ml of spinning solution, fix the syringe in the electrospinning machine, and spread it on the receiving tray Put a layer of tin foil on it, adjust the voltage to 16KV, spin the spinning rate to 0.5ml / h, and spin the amount to 5ml. Spinning is performed after the parameters are adjusted.

[0030] Before absorbing the above spinning solution...

Embodiment 2

[0040] A preparation method of PEO / PVDF composite ultrafiltration membrane, comprising the following steps:

[0041] (1) Add 1.0 g of dichloromethane, 5.4 g of acetone, and 3.6 g of N,N-dimethylacetamide into a glass bottle with a lid to make a mixed solvent, then add 0.02 g of nano-PEO particles, Put in the magnet, cover the lid, put it in a constant temperature water bath magnetic stirrer at a constant temperature of 60°C and stir until the PEO is completely dissolved, then add 1.5g of PVDF powder, continue to put it in a constant temperature water bath magnetic stirrer at a constant temperature of 50°C and stir for 2 Hour. After stirring, take it out and let it stand for swelling for 12 hours to obtain blended spinning solution A. According to the above steps, 0.04g, 0.06g, 0.08g of nano-PEO particles were added respectively, and the amounts and steps of other substances remained unchanged, and the blended spinning solutions B, C, and D could be obtained respectively.

[...

Embodiment 3

[0049] A kind of nano TiO 2 The preparation method of modified PEO / PVDF composite ultrafiltration membrane comprises the following steps:

[0050] (1) Add 1.0 g of dichloromethane, 5.4 g of acetone, and 3.6 g of N,N-dimethylacetamide into a glass bottle with a lid to make a mixed solvent, then add 0.06 g of nano-PEO particles, Put in the magnet, cover the lid, put it in a constant temperature water bath magnetic stirrer at a constant temperature of 60 ℃ and stir until the PEO is completely dissolved, then add 1.5g of PVDF, put it in a constant temperature water bath magnetic stirrer at a constant temperature of 50 ℃ and stir until the PVDF After complete dissolution, add 0.02g nano-TiO 2 The granules were further placed in a constant temperature water bath magnetic stirrer and stirred at a constant temperature of 50° C. for 2 hours. After stirring, take it out and let it stand for swelling for 12 hours to obtain the blended spinning solution E. According to the above steps,...

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Abstract

The invention belongs to the field of ultra-filtration materials and particularly relates to a nano TiO2-modified PEO / PVDF composite ultra-filtration membrane. The nano TiO2-modified PEO / PVDF composite ultra-filtration membrane is characterized by being prepared through mixing nano TiO2 particles, nano PEO particles and a PVDF powder according to a certain ratio to prepare a solution and applying an electro-spinning method. The preparation method comprises the following steps: preparing dichloromethane, acetone and N, N-dimethylacetamide into a mixed solvent, then adding the nano PEO particles and uniformly stirring to obtain a mixed solution; then adding the PVDF powder, stirring at a constant temperature till PVDF is completely dissolved, adding the nano TiO2 particles, continuously stirring, standing and swelling to obtain a blended spinning solution; performing electrostatic spinning and heat treatment. The nano TiO2-modified PEO / PVDF composite ultra-filtration membrane provided by the invention can effectively solve the problems of low water flux, strong hydrophobicity and weak pollution resistance of an existing PVDF ultra-filtration membrane.

Description

technical field [0001] The invention belongs to the field of ultrafiltration materials, in particular to a nano-TiO 2 A modified PEO / PVDF composite ultrafiltration membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) ultrafiltration membranes are widely used in water purification, wastewater treatment and food processing industries. PVDF ultrafiltration membranes can filter out bacteria and viruses while retaining trace elements necessary for the human body. PVDF ultrafiltration membrane and activated carbon fiber are often combined to purify drinking water. Firstly, activated carbon fiber is used to absorb small organic molecules and heavy metal ions, and then PVDF ultrafiltration membrane is used as terminal filter to prevent the leakage of activated carbon fiber. water efficiency. PVDF ultrafiltration membrane is used to treat oily wastewater, does not need demulsification for concentration and separation, and can reali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D67/00B01D61/14
CPCB01D61/145B01D67/0002B01D69/12B01D71/34B01D2323/39
Inventor 周武艺刘水凤曹庆云董先明
Owner SOUTH CHINA AGRI UNIV
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