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Preparation method for nanofiber photothermal film

A nanofiber, photoinduced technology, applied in the field of membrane distillation, can solve the problems of difficulty in expanding application and high energy consumption, and achieve the effects of simple preparation process, strong controllability of membrane performance, and obvious photothermal effect.

Active Publication Date: 2018-11-09
华景微纳科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of ultraviolet light to generate heat, the energy consumption is high, and it is difficult to further expand the application

Method used

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  • Preparation method for nanofiber photothermal film

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preparation example Construction

[0017] The invention provides a method for preparing a nanofiber photothermal film, which is characterized in that the method comprises the following steps:

[0018] A. Preparation of spinning solution: prepare a polymer solution with a mass fraction of 9-18%, add nano-inorganic particles with infrared thermal effect accounting for 1-10% of the solution mass, disperse evenly through ultrasonic vibration and magnetic stirring, and obtain after degassing spinning solution;

[0019] The nano-inorganic particles are oxides with infrared thermal effect, specifically antimony-doped tin oxide (ATO), indium antimony oxide (ITO), silicon dioxide (SiO 2 ) or titanium dioxide (TiO 2 ) at least one; the average particle size of nano-inorganic particles is 30 ~ 50nm; preferably ATO, ATO is made of SnO 2 and SbO 2 Composition, its mass ratio is SnO 2 :SbO 2 =9:1~19:1, the average particle size is 30~50nm, the crystal structure is tetragonal phase, the particle shape is spherical, and t...

Embodiment 1

[0026] A. Preparation of spinning solution: Weigh 5g of polyvinylidene fluoride (model: 761), dissolve it in N,N-dimethylacetamide at a temperature of 70°C and prepare a solution with a mass fraction of 15%; add nano-ATO ( SnO 2 :SbO 2 =9:1) 0.33g (accounting for 1% of the mass of the solution), then add 0.017g of lithium chloride (accounting for 0.05% of the mass of the solution), disperse evenly after ultrasonic vibration and magnetic stirring for 4 hours, and let it stand for defoaming for 12h , to obtain spinning solution;

[0027] B. Preparation of nascent nanofiber photothermal film: Add the spinning liquid described in step A into three 5ml electrospinning syringe devices, and perform electrospinning with multiple needles. Set the spinning parameters as follows: the voltage is 25KV, the distance between the spinneret and the receiver is 10cm, the extrusion speed is 0.5mL / h, the drum speed is 400r / min, and the humidity is 70%. After 8 hours of electrospinning, it is re...

Embodiment 2

[0031] A. Preparation of spinning solution: Weigh 5g of polyvinylidene fluoride (model: 761), dissolve it in N,N-dimethylacetamide at a temperature of 70°C and prepare a solution with a mass fraction of 15%; add nano-ATO ( SnO 2 :SbO 2 =95:5) 1g (accounting for 3% of the solution mass), then add 0.017g lithium chloride (accounting for 0.05% of the solution mass), disperse evenly after ultrasonic vibration and magnetic stirring for 4 hours, let stand for defoaming for 12h, obtain spinning solution;

[0032] B. Preparation of nascent nanofiber photothermal film: Add the spinning liquid described in step A into three 5ml electrospinning syringe devices, and perform electrospinning with multiple needles. Set the spinning parameters as follows: the voltage is 25KV, the distance between the spinneret and the receiver is 10cm, the extrusion speed is 0.5mL / h, the drum speed is 400r / min, and the humidity is 70%. After 8 hours of electrospinning, it is removed from the drum, and then ...

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Abstract

The invention discloses a preparation method for nanofiber photothermal film, which includes the following steps: A, preparing polymer solution with a mass fraction of 9-18%, adding inorganic nano particles with infrared thermal effect accounting for 1-10% of the mass of the solution, then adding inorganic conductive particles accounting for 0.01-0.1% of the mass of the solution,carrying out ultrasonic vibration and magnetic stirring, and obtaining spinning solution after performing defoaming; B. carrying out electrostatic spinning on the spinning solution obtained in Step A to obtain the nanofiber photothermal film; C. carrying out post process on the nanofiber photothermal film obtained in Step B to optimize the film structure. The method has the advantages of simple preparation process,strong controllability of film performance, obvious photothermal effect, and the prepared film can get a very good result in film distillation process with permeation flux being maximumly improved byabout 3 times, and salt rejection rate is kept at 99% or above.

Description

technical field [0001] The invention relates to the technical field of membrane distillation, in particular to a method for preparing a nanofiber photothermal membrane. Background technique [0002] Membrane distillation is a new membrane contactor process combining membrane technology and traditional distillation process. It uses the steam pressure difference generated by the temperature difference between the hot feed liquid and the cold permeate on both sides of the hydrophobic membrane as the driving force to make the steam permeate After passing through the membrane hole, the permeate is condensed to obtain the permeate. Due to the hydrophobicity of the membrane, the liquid on both sides cannot pass through the membrane pores, so as to achieve the purpose of separation. Membrane distillation has the advantages of low energy consumption, high salt interception rate, and low requirements on operating conditions, and has a good application prospect. However, in the proce...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D71/32B01D67/00B01D61/36
CPCB01D61/364B01D67/0079B01D71/32B01D71/34
Inventor 黄庆林高尚鹏黄岩肖长发
Owner 华景微纳科技(苏州)有限公司
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