Superhydrophilic and superoleophobic oil-water separation membrane with humidity responsiveness as well as preparation method and application of oil-water separation membrane

A super-oleophobic, responsive technology, applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of high price, low yield, complicated preparation process, etc., and achieve the effect of good fouling resistance

Active Publication Date: 2015-12-16
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The Chinese invention patent with the publication number CN103601826A discloses the synthesis of a hydrophilic-oleophobic polymer and the preparation of a humidity-responsive oil-water separation membrane, although this omentum also has the ability to convert from superhydrophobic to superhydrophobic under the stimulation of water in the air. Hydrophilic properties and oil-water separation effect, but the preparation of hydrophilic and oleophobic polymers required for the preparation of this membrane is relatively difficult
American literature (ArunK.Kota, GibumKwon, WonjaeChoi, etal.Hygro-responsivemembranesforeffectiveoil-waterseparation[J].NatureCommunications,2012,1-7) also reported the preparation of a humidity-responsive superhydrophilic superoleophobic oil-water separation membrane, However, fluorinated polyorganosilsesquioxane (POSS) is used in the preparation process, the preparation process is complicated, the yield is low, and the price is very expensive.

Method used

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  • Superhydrophilic and superoleophobic oil-water separation membrane with humidity responsiveness as well as preparation method and application of oil-water separation membrane
  • Superhydrophilic and superoleophobic oil-water separation membrane with humidity responsiveness as well as preparation method and application of oil-water separation membrane
  • Superhydrophilic and superoleophobic oil-water separation membrane with humidity responsiveness as well as preparation method and application of oil-water separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] (1) Put a piece of 15×15mm 2 The 300 mesh stainless steel wire mesh was immersed in distilled water, ethanol or acetone, and distilled water in order, respectively, and ultrasonically cleaned at 150W and 40KHz for 8 minutes, and hung up to dry at room temperature.

[0077] (2) Add 50g of tetraethoxysilane, 100g of absolute ethanol, and 20g of deionized water into a four-necked flask, heat it in a constant temperature water bath at 35°C and stir constantly. After stirring, weigh 0.5g of 25% by mass Ammonia water was added to 30 g of deionized water, dropped into a four-necked flask with a constant flow pump at a rate of 1 mL / min, and discharged after being kept for 4 hours to prepare nano silica sol with a particle size of about 20 nm, and the mass content of nano particles was 20%.

[0078] (3) Add 30 g of a 10% isopropanol solution of heptafluorodecyltriethoxysilane to the four-necked flask in step (2), and keep it for 5 hours to prepare an oleophobic modified nano silica so...

Embodiment 2

[0086] (1) Put a piece of 15×15mm 2 The 100 mesh copper wire mesh was immersed in distilled water, ethanol, and distilled water in order, and washed at 100W and 20KHz for 10 minutes, and hung up to dry at room temperature.

[0087] (2) Add 50g of tetraethoxysilane, 100g of absolute ethanol and 20g of deionized water into a four-necked flask, heat it in a constant temperature water bath at 80°C and stir continuously. After stirring is uniform, weigh 0.5g of 25% mass concentration Hydrochloric acid was added to 30 g of deionized water, dropped into a four-necked flask with a constant flow pump at a speed of 1 mL / min, and discharged after being kept for 4 hours to prepare nano silica sol with a particle size of about 500 nm, and the mass content of nano particles was 35%.

[0088] (3) Add 50 g of a 1% tetrahydrofuran solution of tridecafluorooctyltriethoxysilane to the four-necked flask in step (2), and keep it for 5 hours to prepare an oleophobic modified nano silica sol.

[0089] (4) ...

Embodiment 3

[0095] (1) Put a piece of 15×15mm 2 The 200 mesh aluminum wire mesh was immersed in distilled water, ethanol or acetone, and distilled water in order, respectively, and ultrasonically cleaned at 150W and 40KHz for 10 minutes, and hung up to dry at room temperature.

[0096] (2) Add 50g of tetramethoxysilane, 100g of absolute ethanol, and 20g of deionized water into a four-necked flask, heat it in a constant temperature water bath at 35°C and stir continuously. After stirring is uniform, weigh 0.5g of 25% by mass Sodium bicarbonate was added to 30 g of deionized water, dropped into a four-necked flask with a constant flow pump at a speed of 1.5 mL / min, and after holding for 5 hours, the material was discharged to prepare nano silica sol with a particle size of about 200 nm.

[0097] (3) In the four-necked flask in step (2), add 40g of a 1% isopropanol solution of pentafluorononyltriethoxysilane and keep it for 5 hours to prepare an oleophobic modified nano silica sol. Hitachi S-3700...

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Abstract

The invention belongs to the technical field of preparation of oil-water separation membranes and discloses a superhydrophilic and superoleophobic oil-water separation membrane with humidity responsiveness as well as a preparation method and an application of the oil-water separation membrane in oily sewage treatment and oil-water separation. The oil-water separation membrane is prepared with the method comprising the following steps: inorganic nanoparticles are prepared, subjected to oleophobic modification through a perfluoroalkyl siloxane solution and mixed with a prepared hydrophilic coating, and a hybrid hydrophilic coating is obtained; a silk screen is coated with a UV cured water-based anticorrosive coating with a dip coating or spray coating method, and an anticorrosive base coat membrane is obtained; the anticorrosive base coat membrane is coated with the hybrid hydrophilic coating with the dip coating or spray coating method, dried and cured, a micro-nano coarse structure is constructed, and the superhydrophilic and superoleophobic oil-water separation membrane with humidity responsiveness is obtained. The separation membrane has an initial contact angle with water in air being 150 degrees, the angle is reduced to 0 degree within 10-30 min, and the separation membrane has a contact angle with oil drops either in air or underwater being larger than 150 degrees all along.

Description

Technical field [0001] The invention belongs to the technical field of oil-water separation membrane preparation, and particularly relates to a humidity-responsive super-hydrophilic and super-oleophobic oil-water separation membrane, and a preparation method and application thereof. Background technique [0002] The appearance and development of parent substances have brought great convenience to human life, and surfactants are playing a major role in all aspects of life. The grafting of hydrophilic groups and oleophobic groups into the same polymer to form hydrophilic and oleophobic amphiphilic polymers has become a research hotspot in recent years. The development of amphiphilic polymers has greatly promoted the preparation of special wettability materials. When hydrophilic groups and oleophobic groups are arranged in the polymer chain at the same time, hydrophilic and oleophobic amphiphilic polymers can be obtained. . When using this type of polymer to form a film, two group...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022B01D69/02B01D67/00C02F1/40C02F1/44
Inventor 袁腾杨卓鸿涂伟萍周显宏
Owner SOUTH CHINA AGRI UNIV
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