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Oxidized graphene-modified super-hydrophilic super-oleophobic oil-water separation film and preparation method and application thereof

A technology of graphene modification and super oleophobic oil, which is applied in separation methods, chemical instruments and methods, liquid separation, etc., can solve the problems of poor water resistance of the omentum, achieve large water flux, no secondary pollution, and speed fast effect

Inactive Publication Date: 2014-03-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the film-forming substances used in these prior art are all completely water-soluble polymers, resulting in poor water resistance of the omentum

Method used

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  • Oxidized graphene-modified super-hydrophilic super-oleophobic oil-water separation film and preparation method and application thereof
  • Oxidized graphene-modified super-hydrophilic super-oleophobic oil-water separation film and preparation method and application thereof
  • Oxidized graphene-modified super-hydrophilic super-oleophobic oil-water separation film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: GO modified PVA-PAA / nano-SiO 2 Preparation of stainless steel wire mesh oil-water separation mesh

[0033] (1) Add 230ml of concentrated sulfuric acid into a 1000ml three-neck flask, place it in an ice-water bath, add 10g of primary graphite powder and 5g of sodium nitrate under stirring, and stir for 25min. Add 30g of oxidant potassium permanganate within 30min and react for 1h. Move the flask to a 35°C water bath and continue to stir for 30 minutes, then add 460ml of deionized water to dilute, and the temperature rises to 95°C. After stirring for 15 min, the mixture was transferred to a beaker, diluted to 1 L with deionized water, and 25 ml of 30% H 2 o 2 solution until the color of the reaction solution is golden yellow. Wash 3 times with deionized water, and add 3 drops of HCl solution with a mass concentration of 36.5%. Repeatedly washing the above-mentioned reaction solution with deionized water until pH=6.5, and finally vacuum-filtering the washed...

Embodiment 2

[0042] Example 2: GO modified PEG-PUA / nano-SiO 2 Preparation of Copper Mesh Oil-Water Separation Mesh

[0043] (1) Add 500ml of concentrated sulfuric acid into a 1000ml three-neck flask, place it in an ice-water bath, add 25g of primary graphite powder and 10g of sodium nitrate under stirring, and stir for 25min. Add 60g of oxidant potassium permanganate within 30min and react for 1.5h. Move the flask to a 35°C water bath and continue to stir for 25 minutes, then add 500ml of deionized water to dilute, and the temperature rises to 90°C. After stirring for 15 min, the mixture was transferred into a beaker, diluted to 1.5 L with deionized water, and 50 ml of 30% H 2 o 2 solution until the color of the reaction solution is golden yellow. Wash 5 times with deionized water, and add 5 drops of 35% HCl solution. Wash the above-mentioned reaction solution repeatedly with deionized water until pH=7.5, and finally vacuum filter the washed graphite oxide suspension with a Buchner fu...

Embodiment 3

[0052] Example 3: GO modified PDDA-PAA / nano-SiO 2 Preparation of Aluminum Mesh Oil-Water Separation Mesh

[0053] (1) Add 300ml of concentrated hydrochloric acid to a 1000ml three-neck flask, place it in an ice-water bath, add 15g of primary graphite powder and 7g of sodium nitrate under stirring, and stir for 25min. Add 45g of oxidant potassium chlorate within 30min and react for 1h. Move the flask to a 30°C water bath and continue to stir for 30 minutes, then add 480ml of deionized water to dilute, and the temperature rises to 95°C. After stirring for 15 min, transfer the mixture into a beaker, dilute to 1 L with deionized water, add 30 ml of 30% H 2 o 2 solution until the color of the reaction solution is golden yellow. Wash 4 times with deionized water, and add 3 drops of HCl solution with a mass concentration of 36.5%. Repeatedly washing the above-mentioned reaction solution with deionized water until pH=7.0, and finally vacuum-filtering the washed graphite oxide sus...

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Abstract

The invention discloses an oxidized graphene-modified super-hydrophilic super-oleophobic oil-water separation film and a preparation method and application thereof. The method comprises the following steps: mixing a hydrophilic polymer water-sensitive agent and a cross-linking film-forming agent according to a ratio of 1:9-9:1, dissolving the mixture and nano-silica sol in water according to a mass ratio of 1:9-9:1, magnetically stirring uniformly to prepare a 1-99% solution, adding 0.5-1 percent of oxidized graphen as an inorganic cross-linking agent, and ultrasonically and uniformly dispersing; ultrasonically cleaning a fabric silk screen with the particle size of 100-300 meshes, drying at normal temperature, forming a film on the silk screen in a spraying, dip-coating or spinning manner, drying and cross-linking, thus obtaining the hydrophilic and underwater super-oleophobic oil-water separation film. The oil-water separation film has excellent swelling resistance and mechanical property after graphene cross-linking modification, has a contact angle of 0 degree with both water and oil in air and has high super-hydrophilic property; the film has a contact angle of 150 degrees with oil drops under the water and has the low-adhesion characteristic to oil drops. The film can be applied to separation of oil-water mixtures and treatment of oil-containing sewage.

Description

technical field [0001] The invention relates to a new type of functional environmental protection coating, in particular to a graphene oxide-modified oil-water separation omentum with super-amphiphilic in the air and super-oleophobic underwater properties and its preparation method and application, which belongs to the technology of organic-inorganic hybrid nano-functional materials field. Background technique [0002] Membrane separation is a high-efficiency, energy-saving concentration and separation technology. Its basic principle is to use selective permeation membranes to separate, purify, concentrate or enrich multi-component substances under the impetus of energy or chemical potential difference. Membrane separation technology has been successfully applied in various industrial occasions, especially in the oily wastewater treatment industry, and its potential is even greater. Among them, the superhydrophilic and superoleophobic coating film has the properties of supe...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D67/00C02F1/40C02F1/44
Inventor 涂伟萍袁腾陈卓周显宏王锋胡剑青
Owner SOUTH CHINA UNIV OF TECH
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