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Bulk-phase super-hydrophobic nanofiber membrane for membrane distillation and preparation method of bulk-phase super-hydrophobic nanofiber membrane

A nanofiber membrane and nanofiber technology, applied in the field of bulk superhydrophobic nanofiber membranes for membrane distillation and its preparation, can solve the problem of small porosity, low permeation flux, and difficulty in long-term stable operation of microporous hydrophobic membranes. question

Pending Publication Date: 2022-06-17
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the core components in the MD process, commonly used commercial microporous hydrophobic membranes such as polypropylene (PP) and polyvinylidene fluoride (PVDF) have small porosity and low permeation flux, and are subject to concentration polarization and extreme temperature differences. Due to the impact of globalization, it is difficult to achieve long-term stable operation, which has become the main technical bottleneck in the commercialization of membrane distillation technology

Method used

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  • Bulk-phase super-hydrophobic nanofiber membrane for membrane distillation and preparation method of bulk-phase super-hydrophobic nanofiber membrane
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  • Bulk-phase super-hydrophobic nanofiber membrane for membrane distillation and preparation method of bulk-phase super-hydrophobic nanofiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Electrospinning solution preparation: PMDA and ODA with a molar ratio of 1:1 were dissolved in DMF, and a PAA electrospinning solution with a concentration range of 28 wt% was prepared by mechanical or magnetic stirring.

[0026] (2) Preparation of electrostatic spray liquid: blend the PTFE aqueous emulsion with a mass fraction of 60 wt% and a PVA aqueous solution with a mass fraction of 10 wt% at a mass ratio of 15:1, add 3 g of deionized water, and prepare by mechanical or magnetic stirring. PTFE & PVA electrostatic spray solution.

[0027](3) Synchronous electrospinning-electrostatic spraying process: transfer the above two prepared solutions to different syringes, and control the amount of PTFE&PVA electrostatic spraying solution and PAA electrospinning solution by changing the number of syringes filled with different solutions. The volume ratio is 2 / 1, and it is spun under spinning parameters (liquid supply rate 1.0ml / h, voltage 30kV, receiving distance 18cm, s...

Embodiment 2

[0037] (1) Electrospinning solution preparation: PMDA and ODA with a molar ratio of 1:1 were dissolved in DMF, and a PAA electrospinning solution with a concentration range of 26 wt% was prepared by mechanical or magnetic stirring.

[0038] (2) Preparation of electrostatic spray liquid: blend the PTFE aqueous emulsion with a mass fraction of 60 wt% and a PVA aqueous solution with a mass fraction of 10 wt% at a mass ratio of 12:1, add 2 g of deionized water, and prepare by mechanical or magnetic stirring. PTFE & PVA electrostatic spray solution.

[0039] (3) Synchronous electrospinning-electrostatic spraying process: transfer the above two prepared solutions to different syringes, and control the amount of PTFE&PVA electrostatic spraying solution and PAA electrospinning solution by changing the number of syringes filled with different solutions. The volume ratio is 1 / 1, and it is spun under spinning parameters (liquid supply rate 1.2ml / h, voltage 35kV, receiving distance 20cm, ...

Embodiment 3

[0044] (1) Electrospinning solution preparation: PMDA and ODA with a molar ratio of 1:1 were dissolved in DMF, and a PAA electrospinning solution with a concentration range of 24 wt% was prepared by mechanical or magnetic stirring.

[0045] (2) Preparation of electrostatic spray liquid: blend the PTFE aqueous emulsion with a mass fraction of 60 wt% and a PVA aqueous solution with a mass fraction of 10 wt% in a mass ratio of 18:1, add 5 g of deionized water, and prepare by mechanical or magnetic stirring. PTFE & PVA electrostatic spray solution.

[0046] (3) Synchronous electrospinning-electrostatic spraying process: transfer the above two prepared solutions to different syringes, and control the amount of PTFE&PVA electrostatic spraying solution and PAA electrospinning solution by changing the number of syringes filled with different solutions. The volume ratio is 1 / 2, and it is spun under the spinning parameters (liquid supply rate 0.8ml / h, voltage 30kV, receiving distance 15...

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Abstract

The invention provides a bulk-phase super-hydrophobic nanofiber membrane for membrane distillation and a preparation method thereof. The bulk-phase super-hydrophobic nanofiber membrane is characterized in that the diameter of nanofiber in the nanofiber membrane ranges from 50 nm to 500 nm, the diameter of microspheres ranges from 50 nm to 3000 nm, and the porosity of a fiber body is larger than 70%. The preparation method comprises the four steps of preparation of an electrostatic spinning solution, preparation of an electrostatic spraying solution, synchronous electrostatic spinning-electrostatic spraying process and roasting treatment. The nanofiber membrane for membrane distillation has high porosity and a multi-layer lotus leaf-like super-hydrophobic micro / nano structure, the preparation process is simple and efficient, and the nanofiber membrane has a wide application prospect in the field of water treatment.

Description

technical field [0001] The invention relates to a bulk super-hydrophobic nanofiber membrane for membrane distillation and a preparation method thereof, in particular to provide a bulk super-hydrophobic nanofiber membrane for membrane distillation with high porosity and bulk super-hydrophobic performance, and a simple, easy-to-operate, Preparation method of mass-produced bulk superhydrophobic nanofibrous membrane. Background technique [0002] With the rapid development of modern industry and population expansion, water shortage has become a serious challenge facing the world. [0003] Seawater reserves are abundant, accounting for 97% of the global surface water content. The utilization of seawater resources through seawater desalination technology is an effective way to solve water resource problems. At present, seawater desalination processes mainly include multi-stage flash distillation, multi-effect distillation, reverse osmosis and membrane distillation. Among them, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4382D06C7/00B01D61/36B01D67/00B01D69/02
CPCD04H1/728D04H1/43825D06C7/00B01D61/364B01D67/0002B01D69/02B01D2325/38B01D2325/40
Inventor 赵义侠张艺璇鞠敬鸽李雅芳厉宗洁康卫民
Owner TIANJIN POLYTECHNIC UNIV
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