Unlock instant, AI-driven research and patent intelligence for your innovation.

Composite nanofiltration membrane as well as preparation method and application thereof

A composite nanofiltration membrane and reaction technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of low separation efficiency of molybdenum and chromium of the same group of metal elements, so as to increase the redox contact area and avoid The effect of reunion

Active Publication Date: 2022-05-31
ZHEJIANG UNIV OF TECH
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low separation efficiency of molybdenum and chromium in the existing wastewater treatment technology, the invention provides a preparation method and application of a molybdenum / chromium separation composite nanofiltration membrane. The composite nanofiltration membrane has good molybdenum / chromium Separation ability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composite nanofiltration membrane as well as preparation method and application thereof
  • Composite nanofiltration membrane as well as preparation method and application thereof
  • Composite nanofiltration membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Immerse the polytetrafluoroethylene membrane in 10mL of tannic acid solution (0.5wt%) for 20min, take out the polytetrafluoroethylene membrane and then immerse in 10mL of ferrocene Isopar G (90622-57-4) solution (0.05 wt%) at room temperature for 30 min to prepare a polymer support layer with polyphenol / iron mesh.

[0031] (2) Immerse the polymer porous support layer with polyphenol-iron mesh prepared in step (1) into 10mL FeCl 3 solution (0.5wt%) at 60°C for 24h to obtain a polyphenol-iron / FeOOH film with uniform distribution of FeOOH; Valence iron and Fe 3 o 4 Composite iron-based nanoparticles; take out the polymer porous support layer, then immerse in 10mL of trimesoyl chloride in cyclohexane solution (0.1w / v%) and react at room temperature for 5min to obtain molybdenum / chromium separation composite nanofiltration membrane. At room temperature and 0.2MPa, test with 50mg / L Cr(VI) (potassium chromate) and 1000mg / L molybdate (sodium molybdate) at pH 9, the reje...

Embodiment 2

[0033] (1) Immerse the polytetrafluoroethylene film in 10mL of tannic acid solution (0.5wt%) for 20min, take out the polytetrafluoroethylene film and then immerse in 10mL of iron acetylacetonate in Isopar G (90622-57-4) solution (0.05 wt%) at room temperature for 30 min to prepare a polymer support layer with polyphenol / iron mesh.

[0034] (2) Immerse the polymer porous support layer with polyphenol-iron mesh prepared in step (1) into 10mL 60°C FeCl 3 solution (0.5wt%) at 60°C for 24h to obtain a polyphenol-iron / FeOOH film with uniform distribution of FeOOH; with Fe 3 o 4Composite iron-based nanoparticles; take out the polymer porous support layer, then immerse in 10mL of trimesoyl chloride in cyclohexane solution (0.1w / v%) and react at room temperature for 5min to obtain molybdenum / chromium separation composite nanofiltration membrane. At room temperature and 0.2MPa, test with 50mg / LCr(VI) (potassium chromate) and 1000mg / L molybdate (sodium molybdate) at pH 9, the rejecti...

Embodiment 3

[0036] (1) Immerse the polytetrafluoroethylene membrane in 10mL of tannic acid solution (0.5wt%) for 20min, take out the polytetrafluoroethylene membrane and then immerse in 10mL of ferrocene Isopar G (90622-57-4) solution (0.05 wt%) at room temperature for 30 min to prepare a polymer support layer with polyphenol / iron mesh.

[0037] (2) Immerse the polymer porous support layer with polyphenol-iron mesh prepared in step (1) into 10mL 60°C FeCl 3 solution (0.5wt%) at 60°C for 24h to obtain a polyphenol-iron / FeOOH film with uniform distribution of FeOOH; with Fe 3 o 4 Composite iron-based nanoparticles; take out the polymer porous support layer, then immerse in 10mL of trimesoyl chloride in cyclohexane solution (0.1w / v%) and react at room temperature for 5min to obtain molybdenum / chromium separation composite nanofiltration membrane. At room temperature and 0.2MPa, test with 50mg / LCr(VI) (potassium chromate) and 1000mg / L molybdate (sodium molybdate) at pH 9, the rejection ra...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a molybdenum / chromium separation composite nanofiltration membrane as well as a preparation method and application thereof, belongs to the field of membrane materials, and relates to a preparation technology of an organic-inorganic composite membrane. Firstly, a polyphenol-iron net is deposited on a polymer porous support in an interface coordination mode, then iron-based nanoparticles are prepared in an in-situ mineralization and reduction mode, and finally cross-linking is carried out, so that the molybdenum / chromium separation composite nanofiltration membrane is prepared. The preparation method has the advantages that on one hand, hexavalent chromium in a water body can be reduced into trivalent chromium by the prepared iron-based nanoparticles, so that the trivalent chromium can be changed into precipitates to be removed under an alkaline condition; on the other hand, the iron-based nanoparticles can selectively adsorb chromium. Therefore, the method has a wide application prospect in the aspect of treating the wastewater containing the same group of metal molybdenum and chromium.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a composite nanofiltration membrane, a preparation method thereof and its application in molybdenum / chromium separation. Background technique [0002] With the development of petroleum and chemical industry, catalyst plays an important role in the development of petroleum industry and chemical industry. According to statistics, the world consumes about 800,000 tons of catalysts every year, including about 415,000 tons of petrochemical catalysts. However, as the catalyst is used longer, its components and structure will change, resulting in reduced activity or even failure, resulting in a large amount of spent catalyst. If not properly treated, the metal elements in the catalyst can enter the natural environment, causing serious pollution of the environment. At the same time, all kinds of valuable metals are not recycled, which will also cause a waste of resources....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00C02F1/44C02F1/70C02F101/20C02F101/22
CPCB01D69/12B01D67/0079B01D61/027C02F1/442C02F1/705C02F2101/20C02F2101/22Y02P10/20
Inventor 张国亮张旭王玲许炉生
Owner ZHEJIANG UNIV OF TECH