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Preparation method and application of double-template-directed ion-imprinted mesoporous bilayer membrane

An ion imprinting, dual-template technology, applied in the direction of chemical instruments and methods, other chemical processes, process efficiency improvement, etc., can solve the problems of unrealizable rare earth elements, low economic value, etc., and achieve high-selectivity and dual-selective adsorption. , High adsorption capacity, fast bonding effect

Inactive Publication Date: 2018-07-06
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, permanent magnet NdFeB contains many high-value rare earth elements, and it is not enough to recover neodymium alone, and its economic value is also low
Simultaneous selective separation and recovery of two or more rare earth elements (e.g. adsorption of neodymium and dysprosium from NdFeB magnets) is currently not possible

Method used

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  • Preparation method and application of double-template-directed ion-imprinted mesoporous bilayer membrane
  • Preparation method and application of double-template-directed ion-imprinted mesoporous bilayer membrane
  • Preparation method and application of double-template-directed ion-imprinted mesoporous bilayer membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: a preparation method of a dual-template-guided ion-imprinted mesoporous bilayer membrane, which is carried out according to the following steps:

[0028] (1) Preparation of NCC (Nanocrystalline Cellulose):

[0029] Crushed medical absorbent cotton was used at 45°C for 120 minutes with 50 wt% sulfuric acid water. The cooled DDW was added to the reaction system to terminate the hydrolysis and allowed to settle overnight. The system supernatant was poured off and the remaining cloudy dispersion was collected. To remove all soluble cellulosic material, wash three times with deionized water and centrifuge. Finally, the resulting white suspension was dialyzed into a dialysis membrane (molecular weight 12000-14000) until the pH equaled 2.4.

[0030] (2) Preparation of iminodiacetic acid silane: 4.25 g of iminodiacetic acid (IDA) was dissolved in 50 mL of DDW, and the pH of the mixture was adjusted to 11.0 with 10 M NaOH. This solution was placed in an ice bat...

Embodiment 2

[0039] Example 2: A method for preparing a dual-template-guided ion-imprinted mesoporous double-layer membrane is carried out according to the following steps:

[0040] (1) Preparation of NCC (nanocrystalline cellulose):

[0041] The ground medical absorbent cotton was treated with 50 wt% sulfuric acid water for 120 minutes at 45°C. The cooled DDW was added to the reaction system to terminate the hydrolysis, and settled overnight. Pour off the system supernatant and collect the remaining cloudy dispersion. To remove all soluble cellulosic material, wash three times with deionized water and centrifuge. Finally, put the obtained white suspension into a dialysis membrane (with a molecular weight of 12000-14000) for dialysis until the pH value is equal to 2.4.

[0042] (2) Preparation of iminodiacetic acid silane: 4.25 g of iminodiacetic acid (IDA) was dissolved in 50 mL of DDW, and the pH of the mixture was adjusted to 11.0 with 10 M NaOH. This solution was placed in an ice b...

Embodiment 3

[0051] Example 3: A method for preparing a dual-template-guided ion-imprinted mesoporous double-layer membrane is carried out according to the following steps:

[0052] (1) Preparation of NCC (nanocrystalline cellulose):

[0053] The ground medical absorbent cotton was treated with 50 wt% sulfuric acid water for 120 minutes at 45°C. The cooled DDW was added to the reaction system to terminate the hydrolysis, and settled overnight. Pour off the system supernatant and collect the remaining cloudy dispersion. To remove all soluble cellulosic material, wash three times with deionized water and centrifuge. Finally, put the obtained white suspension into a dialysis membrane (with a molecular weight of 12000-14000) for dialysis until the pH value is equal to 2.4.

[0054] (2) Preparation of iminodiacetic acid silane: 4.25 g of iminodiacetic acid (IDA) was dissolved in 50 mL of DDW, and the pH of the mixture was adjusted to 11.0 with 10 M NaOH. This solution was placed in an ice b...

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Abstract

The invention relates to preparation of imprinted mesoporous membranes, in particular to a preparation method of a double-template-directed ion-imprinted mesoporous bilayer membrane and application ofthe double-template-directed ion-imprinted mesoporous bilayer membrane in simultaneous selective adsorption and separation of rare earth neodymium and dysprosium elements from NdFeB magnet, belongingto the technical fields of material preparation and separation. At present, the rare earth element recovered from the NdFeB permanent magnet is too single, so that a variety of rare earth elements can not be recovered at the same time. The preparation method is based on a double-template-directed ion imprinting technique, and takes CNCs as a structure-oriented template and metal ions as an imprinting template so as to prepare the double-template-directed ion-imprinted mesoporous bilayer membrane (IIBFs); by adopting evaporation-induced self-assembly (EISA), the integrity and stability of a bottom membrane are ensured during the preparation of a top membrane; atom transfer radical polymerization (ATRP) is used for grafting a temperature-sensitive monomer onto the surface of the top layer of the IIBFs, so that the separation and absorption of neodymium and dysprosium elements are realized. The material has the advantages of high absorption capacity and high-selectivity double absorption, and is also rapid in bonding and good in repeatability so as to have great potential in industrial application.

Description

technical field [0001] The invention belongs to the technical field of material preparation and separation, and relates to the preparation of imprinted mesoporous membranes, in particular to a preparation method of double-template guided ion-imprinted mesoporous double-layer membranes and the simultaneous selective adsorption and separation of rare earth neodymium and dysprosium from NdFeB magnets Applications. Background technique [0002] In view of the economic feasibility of recovering rare earth elements from waste rare earth permanent magnet NdFeB material, a dual template guided ion imprinted mesoporous membrane was prepared by dual template guided ion imprinting technology, which has been successfully applied to the adsorption separation and recovery of rare earth Nd from waste permanent magnets. 3+ . However, the permanent magnet NdFeB contains many high-value rare earth elements, and it is not enough to recover neodymium elements alone, and its economic value is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C22B59/00C22B3/24
CPCB01J20/268B01J20/28035C22B3/24C22B59/00Y02P10/20
Inventor 郑旭东张奕卞婷婷张雨哲李忠玉
Owner CHANGZHOU UNIV
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