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a mos 2 /Polyelectrolyte hybrid nanofiltration membrane and preparation method thereof

A technology of polyelectrolyte and nanofiltration membrane, which is applied in the field of membrane separation, can solve the problems of unreported dye wastewater separation performance, achieve excellent removal rate and flux, overcome membrane performance degradation, and be environmentally friendly

Active Publication Date: 2020-08-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the actual MoS 2 Hybrid nanofiltration membrane and its separation performance for dye wastewater have not been reported yet

Method used

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  • a mos <sub>2</sub> /Polyelectrolyte hybrid nanofiltration membrane and preparation method thereof
  • a mos <sub>2</sub> /Polyelectrolyte hybrid nanofiltration membrane and preparation method thereof
  • a mos <sub>2</sub> /Polyelectrolyte hybrid nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Disperse 0.5g ammonium molybdate tetrahydrate and 1.0g thiourea into 9ml deionized water, stir until completely dissolved to form liquid A, add 1.0g PDDA to 9ml deionized water and stir for 2h to form liquid B, slowly dissolve liquid A Drop into liquid B and stir for 24 hours, add it to a 25ml reaction kettle, react at 150°C for 36 hours, naturally cool to room temperature, wash with deionized water and absolute ethanol, dry in an oven at 40°C for 24 hours, and grind to obtain PDDA Modified MoS 2 two-dimensional layered particles;

[0020] (2) Prepare 100ml of PDDA solution with a concentration of 10.0g / L with deionized water, and add 0.1g / L of MoS prepared in step (1) 2 Add it into the PDDA solution and ultrasonicate for 0.5h; in addition, prepare 100ml of sodium lignosulfonate solution with a concentration of 10.0g / L;

[0021] (3) Wash the negatively charged polyacrylonitrile-based membrane with deionized water to neutrality after pretreatment, immerse it in the...

Embodiment 2

[0024] (1) Disperse 0.5g ammonium molybdate tetrahydrate and 1.0g thiourea into 9ml deionized water, stir until completely dissolved to form liquid A, add 1.0g PDDA to 9ml deionized water and stir for 2h to form liquid B, slowly dissolve liquid A Drop into liquid B and stir for 24 hours, add it to a 25ml reaction kettle, react at 280°C for 15 hours, naturally cool to room temperature, wash three times with deionized water and absolute ethanol, dry in an oven at 110°C for 12 hours, and grind to obtain PDDA-modified MoS 2 two-dimensional layered particles;

[0025] (2) Prepare 100ml of PDDA solution with a concentration of 1.0g / L with deionized water, and add 1.0g / L of MoS prepared in step (1) 2 Add to the PDDA solution, ultrasonic 4h; In addition, prepare 100ml of sodium lignosulfonate solution with a concentration of 1.0g / L;

[0026] (3) Wash the negatively charged polyacrylonitrile-based membrane with deionized water to neutrality after pretreatment, immerse it in the PDDA ...

Embodiment 3

[0029](1) Disperse 0.5g of ammonium molybdate tetrahydrate and 4.0g of thiourea into 9ml of deionized water, stir until completely dissolved to form liquid A, add 1.5g of PDDA to 8.5ml of deionized water and stir for 2 hours to form liquid B, and dissolve liquid A Slowly drop it into liquid B and stir for 24 hours, add it into a 25ml reaction kettle, react at 220°C for 18 hours, naturally cool to room temperature, wash with deionized water and absolute ethanol three times, dry in an oven at 60°C for 18 hours, and grind to make Two-dimensional layered material MoS 2 ;

[0030] (2) Prepare 100ml of PDDA solution with a concentration of 5.0g / L with deionized water, and 0.08gMoS prepared in step (1) 2 Add PDDA solution and sonicate for 2 hours; in addition, prepare 100ml sodium lignosulfonate solution with a concentration of 5.0g / L;

[0031] (3) Wash the negatively charged polyacrylonitrile-based membrane with deionized water to neutrality after pretreatment, immerse it in the P...

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Abstract

The invention discloses a MoS2 / polyelectrolyte hybrid nanofiltration membrane and a production method thereof, and belongs to the technical field of membrane separation. The production method comprises the following steps: preparing a PDDA surface-modified nano-MoS2; preparing an anionic polyelectrolyte solution and a cationic polyelectrolyte solution containing the PDDA surface-modified nano-MoS2; and carrying out an electrostatic layer-by-layer self-assembling on the anionic polyelectrolyte and the cationic polyelectrolyte solution containing the PDDA surface-modified nano-MoS2 to obtain the MoS2 / polyelectrolyte hybrid nanofiltration membrane. MoS2 is a graphene-like two-dimensional layered material, and has a unique lamellar structure. Polydimethyldiallylammonium chloride (PDDA) is added during the preparation of MoS2 to make the surface of the MoS2 positively charged and improve the dispersion stability, so the MoS2 can be uniformly dispersed in a membrane in the self-assembling process to obtain the hybrid nanofiltration membrane having an excellent MoS2 dispersion performance, and the hybrid nanofiltration membrane has excellent separation removal rate and excellent flux to an aqueous dye solution.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, in particular to a MoS 2 / Polyelectrolyte hybrid nanofiltration membrane and preparation method thereof. Background technique [0002] As a new type of membrane separation technology, nanofiltration is widely used in printing and dyeing wastewater treatment, brackish water desalination, food processing and other fields due to its simple operation, low energy consumption and no pollution. However, in practical applications, problems such as low water flux and membrane fouling still hinder the wide application of nanofiltration. Because the permeability and selectivity of polymer membranes are usually contradictory, high-flux polymer membranes tend to have lower rejection rates, while high-flux polymer membranes have lower fluxes, showing a "Trade-off" effect . Organic-inorganic hybridization is one of the effective methods to solve the "trade-off" effect of polymer membranes. Pate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D69/12B01D69/02B01D67/00B01D61/00
CPCB01D61/027B01D67/0079B01D69/02B01D69/12B01D71/82
Inventor 秦振平周敬源郭红霞安全福张国俊纪淑兰
Owner BEIJING UNIV OF TECH
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