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Preparation method of super hydrophobic and oleophobic film for dual-bionic film with photothermal effects

A photothermal effect, super-hydrophobic technology, applied in chemical instruments and methods, pervaporation, membrane technology, etc., can solve the problems of poor anti-organic pollution effect of super-hydrophobic membrane, low flux of coating modified membrane, complicated preparation process, etc. , to avoid the pore size and porosity greatly decreased, easy to operate, simple process effect

Active Publication Date: 2018-11-02
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor anti-organic pollution effect of the superhydrophobic membrane prepared in the prior art, low flux of coated modified membrane, complicated preparation process, serious environmental pollution, etc., and provide a double bionic membrane with photothermal effect. Preparation method of superhydrophobic and oleophobic membrane for membrane distillation

Method used

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  • Preparation method of super hydrophobic and oleophobic film for dual-bionic film with photothermal effects
  • Preparation method of super hydrophobic and oleophobic film for dual-bionic film with photothermal effects
  • Preparation method of super hydrophobic and oleophobic film for dual-bionic film with photothermal effects

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preparation example Construction

[0028] A method for preparing a superhydrophobic and oleophobic membrane for double biomimetic membrane distillation with photothermal effect, the steps are as follows:

[0029] ① Dopamine modification: dopamine concentration 10.6mM, CuSO 4 Concentration 5mM, H 2 o 2 The concentration is 19.6mM, the buffer is Tris-HCl buffer with pH=8.50, the water bath shaker is used to control the temperature at about 25°C during modification, the shaker speed is 50-300r / min, and the coating time is 0.5h-2h .

[0030] ②Silver deposition: silver nitrate (AgNO 3 ) process the film described in step ①, and deposit a layer of evenly distributed nano-silver spheres on its surface, so that the film has a photothermal effect.

[0031] ③ Fluorination treatment: use 10 mM low surface energy fluoride perfluorodecyl mercaptan to treat the membrane described in step ② for 1-24 hours.

[0032] Apply the superhydrophobic and oleophobic membrane with photothermal effect to direct contact membrane dist...

Embodiment 1

[0034] A method for preparing a superhydrophobic and oleophobic membrane for double biomimetic membrane distillation with photothermal effect, the steps are as follows:

[0035] (1) Dopamine modification: place PVDF treated with absolute ethanol in a medium containing 10.6mM DA, 5mM CuSO 4 and 19.6mM H 2 o 2 In the Tris-HCl buffer solution, the pH value of the buffer solution is 8.50, shake the reaction for 30min in a water bath shaker with a temperature of 25°C and a rotation speed of 200r / min, then rinse with a large amount of deionized water, and dry in a vacuum oven at 45°C Dry polymerized dopamine-modified PVDF.

[0036] (2) Silver deposition: Put the polymerized dopamine-modified PVDF in 300mM silver nitrate solution, shield it with aluminum foil, react at 30°C for 6h, and dry it in a vacuum oven at 45°C to obtain a PVDF film with a micro-nano layered structure.

[0037] (3) Fluorination treatment: Submerge the PVDF deposited with nano-silver particles in 10m perfluor...

Embodiment 2

[0057] A method for preparing a superhydrophobic and oleophobic membrane for double biomimetic membrane distillation with photothermal effect, the steps are as follows:

[0058] (1) Soak the polypropylene (PP) hollow fiber membrane in isopropanol for 1 hour, and dry it at 45°C for later use. Contains 10.6mM DA, 5mM CuSO 4 , 19.6mM H 2 o 2 After the Tris-HCl buffer (pH=8.50) is prepared, put it into the dry polypropylene hollow fiber membrane immediately, shake it in a water bath shaker at 25°C and 200r / min for 1h, take it out, and rinse it with a large amount of deionized water ,drying.

[0059] (2) Treat the above-mentioned PP hollow fiber membrane with 300mM silver nitrate solution for 3 hours at 30°C and avoid light, then treat it with 50mM perfluorodecyl mercaptan for 24 hours, and dry it.

[0060] (3) The contact angle of the modified PP hollow fiber membrane is measured, and the water contact angle can reach 163.5°, and the pore size is about 0.2 μm.

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Abstract

The invention discloses a preparation method of a super hydrophobic and oleophobic film for a dual-bionic film with photothermal effects and used in the field of membrane distillation. According to the method, a porous film substrate is put into a buffer solution containing dopamine so as to obtain a polymerized dopamine modified film material; then, silver nitrate solution is used for treating the film material with the dopamine coating; a rough structure is built; finally, a low-surface-energy substance is used for performing fluorination treatment; the material surface energy is reduced; the super hydrophobic and oleophobic separation film with the micro nanometer delamination structure and the photothermal effects can be obtained. The method is mainly used for solving the problems of low film flux, serious film pollution phenomenon and the like in the film distillation field. The operation is simple; the realization is easy; the structure of the film material cannot be damaged; inaddition, the film flux can be improved; the film pollution phenomenon can be avoided; practical application value is realized.

Description

technical field [0001] The invention belongs to the field of superhydrophobic interface materials, and in particular relates to a method for preparing a superhydrophobic and oleophobic film with photothermal effects for double bionic membrane distillation. Background technique [0002] The membrane distillation process can use low-level energy, waste heat, solar energy, geothermal heat, etc. to produce high-quality water to solve the current problems of scarcity of fresh water resources and serious water pollution. However, there are some defects in the membrane distillation process that limit its development. The more prominent problem is that with the membrane distillation process, membrane fouling and membrane wetting are serious. Inorganic or organic pollution layers cover the membrane surface or block the membrane pores, resulting in temperature polarization, membrane flux attenuation, lower rejection rate, and water quality degradation. At present, the problems of me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02C02F1/44B01D61/36
CPCB01D61/364B01D67/0093B01D69/02C02F1/447
Inventor 李保安单慧婷李希鹏刘军
Owner TIANJIN UNIV
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