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Cyclodextrin grafted halloysite nanotube organic solvent nanofiltration membrane and preparation method thereof

A technology of organic solvent and cyclodextrin is applied in the field of cyclodextrin grafted halloysite nanotube organic solvent nanofiltration membrane and its preparation, and achieves the effects of high permeation capacity, high solute retention rate and high solvent flux

Inactive Publication Date: 2020-06-05
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the basis of previous studies, the present invention utilizes cyclodextrin grafted halloysite nanotubes to prepare organic solvent nanofiltration membranes, which improves the performance of nanofiltration membranes in polar solvents (alcohols and esters, etc.), nonpolar solvents (alkanes, etc.) Classes and benzenes) and the application performance in the nanofiltration separation of mixed solvents, there is no relevant report at present

Method used

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  • Cyclodextrin grafted halloysite nanotube organic solvent nanofiltration membrane and preparation method thereof
  • Cyclodextrin grafted halloysite nanotube organic solvent nanofiltration membrane and preparation method thereof
  • Cyclodextrin grafted halloysite nanotube organic solvent nanofiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) Submerge a polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of 50,000 to 1.0mol. L -1 Sodium hydroxide aqueous solution, submerged at 60° C. for 1 hour, then taken out and fully washed with deionized water at room temperature to obtain a hydrolyzed polyacrylonitrile ultrafiltration membrane.

[0036](2) Preparation of HNTs-β-CD with polycarboxylate as surfactant: ultrasonically disperse HNTs and polycarboxylate in water to prepare HNTs aqueous solution; adjust its pH value to 9-10 with 10wt% NaOH solution; then, Adding epichlorohydrin into the reaction system, heating and stirring to react; centrifuging, washing, and drying to obtain epichlorohydrin-modified HNTs. The mass ratio of HNTs to water is 1:100; the mass ratio of polycarboxylate to HNTs is 0.5:100; the amount of epichlorohydrin added is 5 times the mass of HNTs.

[0037] Then, β-CD and epichlorohydrin-modified HNTs were dispersed into the aqueous solution, and the pH value was a...

Embodiment 2

[0047] According to the method and steps described in Example 1, OSN-HNTs-γ-CD-1.5 membrane was prepared. Under the conditions of 25℃ and 1MPa, the rejection rate of substances with a molecular weight of 400 is 92%. The fluxes of the membrane to isopropanol, n-heptane and toluene are 70.5, 75.4, 40.6L, respectively. m -2 ﹒ h -1 .

[0048] With butanone and toluene as solvent (equal mass ratio), oil soluble red 26 (molecular weight is 378) as solute, solute concentration 1g / L, the initial flux of membrane is 52.4L. m -2 ﹒ h -1 , The rejection rate of the membrane is 93.6%. The long-term stability test results show that the membrane flux is about 45.6L. m -2 ﹒ h -1 ; Then as time goes on, the membrane flux decreases slowly and the rejection rate increases slowly. When the experiment was carried out to 720min, the membrane flux was 38.3L. m -2 ﹒ h -1 , The rejection rate of the membrane is 96.8%. After washing with solvent for 1h, the membrane flux recovery rate...

Embodiment 3

[0050] According to the method and steps described in Example 1, OSN-HNTs-α-CD-1.5 membrane was prepared. Under the condition of room temperature and 1MPa, the rejection rate of the membrane to PEG200 is 98%; m -2 ﹒ h -1 .

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Abstract

The invention discloses a cyclodextrin (CD) grafted halloysite nanotube (HNTs) organic solvent nanofiltration membrane (OSN) and a preparation method thereof, and belongs to the technical field of membranes. The key technology is as follows: a hydrolysis modified polyacrylonitrile ultrafiltration membrane is used as a base membrane, amine compounds and cyclodextrin grafted halloysite nanotubes areused for preparing an aqueous phase solution and cast on the base membrane, then an organic phase solution containing acyl chloride compounds is used for casting, and a composite (separation) layer is prepared through an interfacial polymerization reaction; and finally, drying is performed to obtain the organic solvent nanofiltration membrane. The cyclodextrin grafted halloysite nanotubes are introduced into the organic solvent nanofiltration membrane, the comprehensive advantages of the halloysite nanotubes and cyclodextrin are exerted, and transfer channels of a polar solvent and a non-polar solvent are constructed in the membrane at the same time; and particularly, the oriented arrangement of the halloysite nanotubes plays a good role in promoting the passing of the solvent. The disclosed membrane has good application prospects in nanofiltration separation of polar solvents (alcohols, esters and the like), non-polar solvents (alkanes and benzenes) and mixed solvents.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to a cyclodextrin-grafted halloysite nanotube organic solvent nanofiltration membrane and a preparation method thereof. Background technique [0002] Organic solvent nanofiltration is a promising clean and efficient separation technique widely used in the separation of organic solvents and solutes. However, there are relatively few research reports on organic solvent nanofiltration membranes that can successfully pass both polar solvents and non-polar solvents (Journal of Membrane Science, 2014, 459: 22-32; ACS Sustainable Chem. Eng. 2015, 3 , 1925-1933; Composites Part A: Applied Science and Manufacturing 2017, 100, 139-149). The applicant of the present invention has carried out some research work in this field. He once poured the aqueous solution of cyclodextrin and amine compounds on the base film, and then poured the organic phase solution containing acid chloride compounds,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/02
CPCB01D61/027B01D67/0002B01D67/0006B01D69/125
Inventor 张浩勤王景涛张亚涛毛恒李凤丽武文佳张婕廉红蕾
Owner ZHENGZHOU UNIV