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Enhanced nano-composite forward osmosis membrane as well as preparation method and application thereof

A nano-composite, forward osmosis membrane technology, used in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve problems such as unsatisfactory proton transmission efficiency, transmission efficiency does not reach the limit, etc., achieve excellent ion exchange capacity, high Effects of porosity and ultra-high specific surface area

Pending Publication Date: 2022-01-11
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Forward osmosis (FO) membrane is a key component of osmotic bioelectrochemical system (OsBES), which plays an important role in proton transport. Transmission efficiency is not ideal
Because these ordinary forward osmosis (FO) membranes only have osmotic function and have no specific selectivity for protons, they can only migrate with water molecules from the anode chamber to the cathode chamber under the action of osmotic pressure difference. The transmission efficiency of protons is far from reaching the limit, and there is still a lot of room for improvement

Method used

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  • Enhanced nano-composite forward osmosis membrane as well as preparation method and application thereof
  • Enhanced nano-composite forward osmosis membrane as well as preparation method and application thereof
  • Enhanced nano-composite forward osmosis membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Prepare an enhanced nanocomposite forward osmosis membrane, the specific preparation method is as follows:

[0044] 1. Preparation of enhanced supporting base membrane: Add polysulfone particles into N,N-dimethylformamide (DMF) solvent according to the requirement of mass concentration of 5wt%, heat and stir for 12 hours to prepare a uniform and stable casting solution, static Place it for defoaming for 24 hours; spread the substrate (non-woven fabric with a pore size of 0.1 μm) on a clean glass plate, then pour the above casting solution on the non-woven fabric, adjust the height of the scraper to 150 μm, and scrape the film at a constant speed. Then the glass plate was quickly immersed in the pure water coagulation bath, and after 30 minutes, the formed phase inversion basement membrane was taken out from the coagulation bath, and rinsed repeatedly with deionized water to prepare a reinforced support basement membrane, which was placed in a deionized In water for late...

Embodiment 2

[0049] Prepare an enhanced nanocomposite forward osmosis membrane, the specific preparation method is as follows:

[0050] 1. Preparation of reinforced support base membrane: Add polyethersulfone particles into N,N-dimethylacetamide (DMAc) solvent according to the requirement of mass concentration of 20wt%, heat and stir for 12 hours, and prepare a uniform and stable casting solution , stand for defoaming for 24 hours; spread the base material (metal mesh with an average pore size of 60 μm) on a clean glass plate, then pour the above casting solution on the metal mesh, adjust the height of the scraper to 200 μm, scrape the film at a constant speed, and then The glass plate was quickly immersed in a pure water coagulation bath, and after 30 minutes, the formed phase inversion supporting basement membrane was removed from the coagulation bath, and rinsed repeatedly with deionized water to prepare a reinforced supporting basement membrane, which was soaked in deionized water at 4 ...

Embodiment 3

[0055] Prepare an enhanced nanocomposite forward osmosis membrane, the specific preparation method is as follows:

[0056] 1. Preparation of reinforced support base film: disperse polyacrylonitrile particles in N-methylpyrrolidone (NMP) solvent according to the requirement of mass concentration of 30wt%, heat and stir for 12 hours, prepare a uniform and stable casting solution, let stand to remove Soak for 24 hours; spread the base material (a screen with a pore size of 30 μm) on a clean glass plate, then pour the above casting solution on the screen, adjust the height of the scraper to 150 μm, scrape the film at a constant speed, and then quickly immerse the glass plate In a pure water coagulation bath, after 30 minutes, the formed phase inversion basement membrane was taken out from the coagulation bath, and rinsed repeatedly with deionized water to prepare a reinforced support basement membrane, which was placed in deionized water at 4°C for use.

[0057] 2. Preparation of ...

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Abstract

The invention relates to an enhanced nano-composite forward osmosis membrane as well as a preparation method and application thereof, and belongs to the technical field of composite osmosis membranes. The invention provides a preparation method of an enhanced nano-composite forward osmosis membrane, which comprises the step of introducing metal organic framework nanoparticles into a salt intercepting layer prepared by an interfacial polymerization method so as to prepare the composite forward osmosis membrane with efficient proton transmission performance. The metal organic framework nanoparticles have ultrahigh specific surface area, high porosity and easiness in functionalization, have good compatibility with the membrane, and can provide extra abundant proton transmission channels for the forward osmosis membrane. Therefore, the enhanced nano-composite forward osmosis membrane prepared by the invention has excellent ion exchange capacity, conductivity and proton transfer flux, and can effectively improve the pollutant degradation efficiency, the electricity production amount and the water production amount when being applied to an osmosis bioelectrochemical system.

Description

technical field [0001] The invention belongs to the field of membrane technology, and relates to an enhanced nanocomposite forward osmosis membrane, a preparation method and application thereof. Background technique [0002] Osmotic Bioelectrochemical System (Osmotic Bioelectrochemical System, OsBES) is a new wastewater treatment process developed in recent years. This new synergistic system combines the advantages of forward osmosis (Forward Osmosis, FO) and bioelectrochemical system (Bioelectrochemical System, BES). The function of recycling components such as matter, energy, and water molecules. However, during the operation of the osmotic bioelectrochemical system (OsBES), the cathode is easily alkalized and the anode is easily acidified, which will not only cause a negative shift in the cathode potential but a positive shift in the anode potential, resulting in an increase in the pH gradient between the cathode and the anode, resulting in excessive The problem of pote...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D67/00B01D69/10B01D69/12B01D71/76C02F3/00C02F3/34C08G83/00C02F101/30
CPCB01D61/002B01D69/10B01D67/0013B01D67/0016B01D69/105B01D69/125B01D67/0095B01D71/76C02F3/005C02F3/34C08G83/00B01D2325/021B01D2323/12C02F2101/30
Inventor 刘鸿田恩玲刘元王厦黄秋云
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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