A kind of organic solvent nanofiltration composite membrane whose active layer is molybdenum disulfide and preparation method thereof

A molybdenum disulfide and organic solvent technology, applied in the field of organic solvent nanofiltration composite membrane and its preparation, can solve the problems of low membrane selectivity, large molecular diffusion resistance, low flux, etc., and achieve improved nanofiltration performance and stability. Good, high solute rejection

Active Publication Date: 2021-06-01
河南又日新环保设备有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although inorganic ceramic membranes have superior stability and solvent resistance, the membrane selectivity is low
Polymer membranes and hybrid membranes are mostly composite membranes, and the polymer free volume holes in the separation layer provide transmission channels for solvent molecules, making molecular diffusion resistance large and flux low

Method used

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  • A kind of organic solvent nanofiltration composite membrane whose active layer is molybdenum disulfide and preparation method thereof
  • A kind of organic solvent nanofiltration composite membrane whose active layer is molybdenum disulfide and preparation method thereof
  • A kind of organic solvent nanofiltration composite membrane whose active layer is molybdenum disulfide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Treatment of the basement membrane: prepare 2 g / L dopamine hydrochloride aqueous solution, and add an appropriate amount of tris to adjust the pH to 7-8, fully soak the organic microfiltration membrane, and place it on a shaking table at 25°C Shake in medium for 4 hours, after the shaking is over, pour off the dopamine hydrochloride aqueous solution, and put the modified organic microfiltration membrane in deionized water for later use.

[0037] Treatment of polydopamine layer: Under alkaline conditions and the presence of oxygen, dopamine hydrochloride will undergo surface self-polymerization surface modification on the basement membrane to form a super-adhesive polydopamine layer, the same below.

[0038] Preparation of molybdenum disulfide nanosheet dispersion: disperse 0.3 g molybdenum disulfide powder in 1 L of mixed solvent of absolute ethanol and water (absolute ethanol: water mass ratio is 7:3); the thickness of molybdenum disulfide nanosheets About 1nm, side wi...

Embodiment 2

[0047] The treatment of the base film, the treatment of the polydopamine layer and the preparation process of the molybdenum disulfide nanosheet dispersion are the same as in Example 1.

[0048] 600 mL of the prepared molybdenum disulfide nanosheet dispersion was self-stacked on the base film by low-speed suction filtration, and the thickness of the active layer obtained was 2 μm.

[0049] Its organic solvent flux, dye retention performance and long-term operation stability were tested, and its performance is as follows:

[0050] Solvent flux performance of composite membranes:

[0051] Acetonitrile throughput of 5795 L / m 2 h bar, the flux to acetone is 5681.2 L / m 2 h bar, the flux to ethyl acetate is 4412.6 L / m 2 h bar, the methanol flux is 3639.4 L / m 2 h bar, the flux of p-toluene is 1837.3L / m 2 h bar, the flux to water is 1773.1 L / m 2 h bar with a flux of 858.7 L / m for isopropanol 2 h bar, flux to n-hexane 135.2 L / m 2 h bar.

[0052] The rejection performan...

Embodiment 3

[0055] The treatment of the base film, the treatment of the polydopamine layer and the preparation process of the molybdenum disulfide nanosheet dispersion are the same as in Example 1.

[0056] 900 mL of the prepared molybdenum disulfide nanosheet dispersion was self-stacked on the base film by low-speed suction filtration, and the thickness of the active layer obtained was 3 μm.

[0057] Its organic solvent flux, dye retention performance and long-term operation stability were tested, and its performance is as follows:

[0058] Solvent flux performance of composite membranes:

[0059] Acetonitrile flux of 4254.7 L / m 2 h bar, the flux to acetone is 4235.6 L / m 2 h bar, the flux to ethyl acetate is 3079.9 L / m 2 h bar, the methanol flux is 2896.1 L / m 2 h bar, the flux of p-toluene is 1339.9 L / m 2 h bar, the flux to water is 1350.8 L / m 2 h bar with a flux of 664.3 L / m to isopropanol 2 hbar, flux to n-hexane 94.3 L / m 2 h bar.

[0060] The rejection performance of ...

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Abstract

The invention belongs to the technical field of organic solvent nanofiltration membrane separation, in particular to an organic solvent nanofiltration composite membrane whose active layer is molybdenum disulfide and a preparation method thereof. The dopamine-modified organic microfiltration membrane is used as the base membrane, and molybdenum disulfide nanosheets are self-stacked on the base membrane by low-speed suction filtration to prepare an organic solvent nanofiltration composite membrane. The organic solvent nanofiltration composite membrane of the present invention is compared with the existing composite membrane with the organic microfiltration membrane as the base membrane, under the same interception performance, the present invention can significantly improve the flux of the solvent. Generally speaking, the organic solvent nanofiltration composite membrane has high solvent flux, high solute rejection rate and good stability, and can be well applied in the field of membrane separation.

Description

technical field [0001] The invention belongs to the technical field of organic solvent nanofiltration membrane separation, in particular to an organic solvent nanofiltration composite membrane whose active layer is molybdenum disulfide and a preparation method thereof. Background technique [0002] Organic solvents are widely used in petrochemical, pharmaceutical and food industries, with a large amount of use and an increasing market demand year by year. The problem of organic solvent pollution is becoming more and more prominent, especially the air pollution and water pollution caused by organic solvents, which seriously affect people's health. Due to the advantages of high efficiency, less pollution, and low energy consumption, membrane separation technology is gradually replacing traditional distillation and extraction technologies to separate and purify various organic solvents. Organic solvent nanofiltration is driven by pressure, and the differential transmission of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00
CPCB01D67/0079B01D69/12
Inventor 郭宏晓王景涛陈佳乐吴晓莉周岩崔旭林
Owner 河南又日新环保设备有限公司
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