Preparation method and using method for polyamino/amidoxim-modified multifunctional ion exchange fibers

An ion-exchange fiber and amidoxime-based technology, applied in the field of wastewater treatment, can solve problems such as easy scaling, poor removal effect, and limited adsorption capacity

Pending Publication Date: 2019-02-01
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above methods mainly used to treat wastewater have some disadvantages: ①Chemical precipitation method: the removal effect of some of the lower concentration uranium-containing wastewater is poor, and the generated sediment must be properly disposed of to avoid secondary pollution; ②Ion exchange method: It is greatly affected by cost, type of exchanger and output, and the regeneration and disposal of ion exchanger is also difficult; ③Membrane separation technology: high investment cost, easy to scale, usually requires pretreatment of influent, Therefore, membrane separation technology needs to be combined with other treatment methods; ④ Adsorption method: limited adsorption capacity
Li...

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  • Preparation method and using method for polyamino/amidoxim-modified multifunctional ion exchange fibers
  • Preparation method and using method for polyamino/amidoxim-modified multifunctional ion exchange fibers

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Embodiment 1

[0023] Mixed solution 1 was prepared according to the volume ratio of aminating agent, swelling agent, and deionized water at 4:1:1, and the molar ratio of the nitrile group in the polyacrylonitrile fiber to the aminating agent was 4:1 to mixed solution 1. Add polyacrylonitrile fibers to the mixture, react with hydrothermal reaction at 110°C for 3 hours, wash with deionized water, and then dry at 60°C for 12 hours to prepare polyamine-modified ion-exchange fibers. The polyamine-based grafting rate It is 34.3%; wherein, the amination reagent is ethylenediamine, and the swelling agent is ethylene glycol; the volume ratio of swelling agent to deionized water is 4:1, and the mass concentration of hydroxylamine hydrochloride is 2.0g / L. Mix solution 2, use a pH regulator to control the pH of solution 2 at 7.0, and weigh the polyamine-based ion-exchange fiber according to the solid-to-liquid ratio of the polyamine-based ion-exchange fiber to the mixed solution 2 of 5.0g: 1L, and add t...

Embodiment 2

[0024] Example 2: Mixed solution 1 was prepared according to the volume ratio of amination reagent, swelling agent and deionized water as 3:2:1, and the molar ratio of the nitrile group in the polyacrylonitrile fiber to the amination reagent was 3:1 Add polyacrylonitrile fibers to the mixed solution 1, react with water heat at 100°C for 5 hours, wash with deionized water, and then dry at 70°C for 12 hours to prepare polyamine-modified ion-exchange fibers. The radical grafting rate is 28.4%; among them, the amination agent is acrylamide, and the swelling agent is methylene disulfone; according to the volume ratio of swelling agent to deionized water is 2:1, the mass concentration of hydroxylamine hydrochloride is 3.0g / L Mixed solution 2 was prepared with a pH regulator to control the pH of solution 2 at 6.5, and the polyamine-based ion exchange fiber was weighed according to the solid-liquid ratio of the polyamine-based ion-exchange fiber to the mixed solution 2. 3.0g: 1L Fiber...

Embodiment 3

[0025] Example 3: Mixed solution 1 was prepared according to the volume ratio of amination reagent, swelling agent and deionized water as 2:2:1, and the molar ratio of the nitrile group in the polyacrylonitrile fiber to the amination reagent was 5:1 Add polyacrylonitrile fibers to the mixed solution 1, and conduct a hydrothermal reaction at 120°C for 4 hours, wash with deionized water, and then dry at 80°C for 6 hours to prepare polyamine-modified ion-exchange fibers. The radical grafting rate is 51.6%; among them, the amination agent is acrylamide, and the swelling agent is methylene disulfone; according to the volume ratio of swelling agent and deionized water is 5:1, the mass concentration of hydroxylamine hydrochloride is 5.0g / L Mixed solution 2 was prepared with a pH regulator to control the pH of solution 2 at 7.5, and the polyamine-based ion exchange fiber was weighed according to the solid-liquid ratio of the polyamine-based ion-exchange fiber to the mixed solution 2. 1...

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Abstract

The invention provides a preparation method and a using method for polyamino/amidoxim-modified multifunctional ion exchange fibers. Polyacrylonitrile fibers used as a base material are sequentially grafted with a polyamino group and an amidoxim group through a hydrothermal process to prepare the polyamino/amidoxim-modified multifunctional ion exchange fibers. The chelation property of effective functional groups and metal ions is used to treat conventional metal element, nonmetal element or radioactive element wastewater. The preparation method and the using method are simple, the graft ratioof functional groups is high, and the prepared multifunctional ion exchange fibers have the advantages of stable performances, good hydrophilicity, high radiation resistance and high adsorption capacity. The problems of swelling-shrinkage and cracking of resin, silica gel and other traditional materials in different pH environments are avoided.

Description

technical field [0001] The invention relates to waste water treatment, in particular to the preparation and use of multifunctional ion exchange fibers. Background technique [0002] With the development of the economy, the demand for natural resources is increasing. The full collection and reuse of resources is an effective way to alleviate resource tension. Among them, as non-renewable resources, various metals generally have less reserves or more difficult smelting and processing. In addition, during the collection, extraction, and smelting of metal minerals, the operation of nuclear reactors, and the decommissioning of nuclear facilities, a large amount of natural resources are consumed, and the waste water generated poses a serious hazard to human health and the natural ecological environment. Therefore, in order to achieve sustainable development, reduce environmental pollution, resource consumption, and resource recycling, it is of great strategic significance to stu...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28
CPCB01J20/261B01J20/265C02F1/285C02F2101/006
Inventor 董发勤程艳霞何平聂小琴
Owner SOUTHWEAT UNIV OF SCI & TECH
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