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Method for preparing high-flux composite membrane from dopamine-modified nanometer material

A nanomaterial, dopamine technology, applied in chemical instruments and methods, dyed polymer organic compound treatment, membrane technology and other directions, can solve the problem of not improving the dispersibility of titanium dioxide, achieve the improvement of water flux and anti-pollution ability, and easy to operate Easy, performant results

Inactive Publication Date: 2012-08-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are reports in the literature that dopamine is used to modify titanium dioxide and graft other particles on the surface, but it does not improve the dispersion of titanium dioxide.

Method used

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  • Method for preparing high-flux composite membrane from dopamine-modified nanometer material
  • Method for preparing high-flux composite membrane from dopamine-modified nanometer material
  • Method for preparing high-flux composite membrane from dopamine-modified nanometer material

Examples

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example 1

[0017] Weigh 0.025g, 0.05g, 0.075g, and 0.1g of dopamine respectively and add them to 50ml of Tirs-HCl buffer solution with a concentration of 10mM. After the dopamine is completely dissolved, adjust the pH value to 8.5 with HCl to prepare concentrations of 0.5g / l, 1.0g / l, 1.5g / l, 2.0g / l dopamine solution. Add 0.5g nano-TiO to the dopamine solution 2 (P25), the prepared solution was shaken in a shaker for 24 hours at a temperature of 30° C. and a rotation speed of 150 r / min. The modified solution is black. Dry the modified solution at 105°C to obtain a black solid. After grinding, a black powder is obtained, which is TiO modified with different concentrations of dopamine. 2 .

example 2

[0019] The film making process is carried out according to the following steps. First, the unmodified TiO 2 TiO modified with dopamine 2 (take 1.5g / l concentration as an example) into the DMAc solution, ultrasonic 30min to make it evenly dispersed, then weigh a certain amount of PVDF and pore-forming agent PVP into the organic solvent, mix and stir evenly at room temperature for 6h, Make it form a stable casting solution, and the ratio of the casting solution is shown in the table below. After stirring, let it stand for defoaming. The obtained film casting solution was scraped on a glass plate with a scraper knife to make a thin film with a thickness of 250um, and then the liquid film and the glass plate were immersed in deionized water. The PVDF film solidified and peeled off automatically to form a new film. Soak in deionized water for 24h for performance test. Other different concentrations of dopamine modified TiO 2 Composite membranes with PVDF are all prepared by th...

example 3

[0023] For different concentrations of PDA-TiO prepared 2 / PVDF composite membrane was used to measure the flux of clean water and the anti-pollution ability in suspension solution. Using the constant pressure filtration method, the prepared membrane was installed on the membrane module (effective area 0.072m 2 ), use a peristaltic pump to pump water, use a vacuum gauge to control the pressure to 0.01MPa, adjust the pump speed to control the constant pressure, and measure the water flux as figure 1 shown. Prepare a yeast suspension solution with a concentration of 1g / l, measure the anti-pollution performance in the reactor, and the aeration intensity is 0.15m 3 / h, the pressure is 0.01MPa, the measured flux changes as figure 2 shown.

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Abstract

The invention relates to a method for preparing a high-flux composite membrane from a dopamine-modified nanometer material and belongs to the technical field of modification of membrane materials. The method is characterized by comprising the following steps of: forming an active poly-dopamine composite layer on the surfaces of titanium dioxide nanometer grains by utilizing automatic polymerization of dopamine, selecting different concentrations of dopamine-modified titanium dioxide grains, and adding the modified nanometer grains utilized as additives into a membrane casting solution, in which the mass fraction of PVDF (Polyvinylidene Fluoride) is 13% and the mass fraction of PVP (Polyvinyl Pyrrolidone) is 4%, so as to bend and modify according to different proportions, thus obtaining a composite membrane prepared from dopamine-modified nanometer titanium dioxide. The method for preparing the high-flux composite membrane from the dopamine-modified nanometer material, disclosed by the invention, has the advantages that dopamine-modified titanium dioxide can be greatly dispersed in an organic solvent to form a uniform dispersed phase; the additive can be used for effectively improving the hydrophilcity and anti-pollution capability of the high-flux composite membrane; and the dopamine modification method is simple, the condition is gentle, the flux of the prepared membrane is large and the anti-pollution capability is strong.

Description

technical field [0001] The invention belongs to the technical field of membrane material modification. It involves using dopamine to modify the surface of nanometer materials to improve the hydrophilicity and dispersibility of materials, and using the addition of hydrophilic nanometer materials to the casting solution to improve the hydrophilicity and anti-pollution ability of the membrane. Background technique [0002] Membrane separation technology is one of the high-tech industries in the 21st century. Due to its characteristics of operation at room temperature, no phase change, high efficiency and energy saving, and no pollution in the production process, it is widely used in drinking water purification, industrial water treatment, food and beverage water It is widely used in purification, sterilization, recovery and refining of biologically active substances. It also has broad application prospects in environmental engineering, especially in wastewater treatment and re...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/34B01D67/00C09C1/36C09C3/10
Inventor 柳丽芬邵冰陈会萍杨凤林
Owner DALIAN UNIV OF TECH
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