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Strongly alkaline anion exchange fibers as well as preparation method and applications thereof

A technology of exchange fiber and strong alkali, which is applied in the field of strong alkali anion exchange fiber and preparation, can solve the problems of affecting the adsorption performance of ion exchange fiber, poor mechanical strength and stability, complicated and complicated process, etc., and it is easy to achieve industrial promotion and implementation , wide applicability and simple process

Inactive Publication Date: 2012-07-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods also have certain deficiencies. For example, the presence of carboxyl groups in strong alkali and weak acid ion exchange fibers will affect the adsorption performance of ion exchange fibers to anions; and the mechanical strength and stability of acrylic fibers are not as good as polypropylene fibers in application.
These methods have the potential danger of indirectly producing toxic or carcinogenic substances, and the reaction conditions are harsh, the process is cumbersome and complicated, and the cost is expensive, etc.

Method used

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  • Strongly alkaline anion exchange fibers as well as preparation method and applications thereof
  • Strongly alkaline anion exchange fibers as well as preparation method and applications thereof
  • Strongly alkaline anion exchange fibers as well as preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Preparation of PP-g-AAm by pre-irradiation method

[0026] use 60 Coγ-ray pre-irradiation method, polypropylene (PP) fibers are placed in a sample bag, pre-irradiated with a dose rate of 2kGy / h for 40kGy, taken out and put into a desiccator, and stored in a freezer in a refrigerator for use. Quantitatively add 20ml of solution into a 50mL test tube, in which the concentration of ferrous ammonium sulfate (Mohr's salt) is 0.25%, the concentration of AAm is 20%, 1.6g of pre-irradiated PP fibers, and nitrogen gas is passed for 10 minutes. Put it in a constant temperature bath at 70°C for 4 hours, take out the grafted fiber and soak it in dilute hydrochloric acid solution for 24 hours, put it into a Soxhlet extractor and extract it with water for 6 hours to remove AAm monomer and its homopolymer. Vacuum dry at 60°C and -0.09MPa for 24h. After weighing, the grafting rate was calculated according to formula 1.

[0027] G = ...

Embodiment 2

[0030] Example 2: Preparation of PP-g-VAm fibers by Hofmann degradation

[0031] Put 5g of PP-g-AAm grafted fibers in a 250ml Erlenmeyer flask, add 150ml of deionized water, and fully swell at 25°C for 24h. The reaction is carried out at -15 ° C ~ 0 ° C, according to the content of amide groups (P-CONH 2 ), sodium hypochlorite (C1O - ) and sodium hydroxide (OH - ) with a mass ratio of 1:1:25 was added to NaOH solution and NaClO solution, and reacted for 10 h. Then transfer the fiber to a 200ml ion exchange column (with a jacket, and pass through -1~1°C ice brine), wash the fiber with 500ml of methanol at -5~0°C until neutral, add 500ml of 12mol / L hydrochloric acid, release CO 2 gas. Wash with 1000ml of deionized water until neutral, and vacuum-dry at 60°C and -0.09MPa for 24h to obtain the degradation product PP-g-VAm fiber. The amino exchange capacity of fibers was determined by the following method:

[0032] Pretreat the PP-g-VAm fiber sample with 0.1-1.0mol / L NaOH aq...

Embodiment 3

[0041] Embodiment 3: Grafting ETA to prepare PP-g-VAm-ETA fiber

[0042] Dissolve 2.63g of ammonium cerium nitrate in 60ml of 1mol / L nitric acid solution to obtain an initiator solution. In a 250ml three-neck flask equipped with a stirrer and a reflux condenser, add 100ml of isopropanol as a solvent, then add 5g of PP-g-VAm fiber, blow nitrogen, and then add cerium ammonium nitrate solution and 2,3-epoxy Propyltrimethylammonium chloride (ETA), system total volume 100ml, cerium ammonium nitrate concentration 0.75mmol / L, 2,3-epoxypropyltrimethylammonium chloride (ETA) concentration 20%, warming up to 80 ° C, stirred and reacted for 12h. After the reactant was cooled to 25°C, it was washed successively with 300ml of methanol and 300ml of acetone, and dried under vacuum at 60°C and -0.09MPa for 24h to obtain PP-g-VAm-ETA fibers. The strong base group content of the fiber is 3.1018mmol / g (dry fiber). The method for determining the content of strong basic groups in fibers refers ...

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Abstract

The invention relates to strongly alkaline anion exchange fibers as well as a preparation method and applications thereof. The preparation method comprises the following steps of: using polypropylene fiber as the matrix to perform the pre-irradiation graft of acrylamide, performing Hofmann degradation to obtain PP-g-VAm (polypropylene-grafted-polyvinylamine) fiber, then using the weakly alkaline ion exchange fiber (PP-g-VAm) as the matrix and ammonium ceric nitrate as the initiator to respectively graft 2,3-epoxypropyl trimethyl ammonium chloride and (2-(acryloyloxy)ethyl)trimethylammonium chloride (DAC) and prepare the strongly alkaline anion exchange fiber PP-g-VAm-ETA (polypropylene-grafted-polyvinylamine-ethylene / vinyl acetate) and the strongly alkaline anion exchange fiber PP-g-VAm-DAC (polypropylene-grafted-polyvinylamine-DAC), wherein the strongly alkaline group contents are respectively 2.4105-4.2018mmol / g and 2.5567-4.2217mmol / g. The two fibers are applied in the adsorption and desorption of nitrate ions. A static adsorption experiment shows that the maximum adsorption capacities of the two fibers to nitrate ions are respectively 11.24mg / g and 9.79mg / g and the desorption rates are more than 97%; and the two fibers can perform selective adsorption to nitrate ions and the impact of the other negative ions such as chloride ions, on the nitrate ion adsorption performance of the fibers is little.

Description

technical field [0001] The invention relates to a strong basic anion exchange fiber and its preparation method and application, in particular to the manufacturing method technology of the strong basic anion exchange fiber containing quaternary ammonium groups and its related application. Background technique [0002] Ion exchange fiber (IEF) has the advantages of large specific surface area, fast exchange and elution speed, easy regeneration, high adsorption capacity, low fluid resistance, low filtration energy consumption, easy preparation into various shapes, various application forms, and convenient use. advantage. At present, ion exchange fibers have been applied in the fields of waste water, waste gas purification, environmental protection, ion exchange, separation analysis, recovery of precious metals and other useful substances. [0003] The preparation methods of strongly basic anion exchange fibers can be summarized into two categories: one is the method of blend o...

Claims

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Application Information

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IPC IPC(8): B01J41/14D06M14/28D06M11/38D06M11/30D06M13/46D06M14/10C02F1/42B01D53/02
Inventor 张政朴李睿智肖华明王瑀刘帅
Owner NANKAI UNIV
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