Fluorine-removing composite fiber membrane as well as preparation method and application thereof

A composite fiber membrane, polyvinylidene fluoride technology, applied in fiber treatment, fiber chemical characteristics, chemical instruments and methods, etc., can solve the problems of limiting the adsorption efficiency and performance of chitosan, and achieve adsorption equilibrium in a short time and a form of use. Convenience and cost-saving effect

Active Publication Date: 2020-06-16
SHENHUA SHENDONG COAL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chitosan materials modified or cross-linked by metal ions have more excellent adsorption and regeneration properties. However, chitosan is mostly in the form of particles with dense texture, and the adsorption of fluoride ions mainly occurs in the chitosan particles. On the surface, it is difficult for fluoride ions to penetrate into the interior of chitosan, which greatly limits the adsorption efficiency and performance of chitosan

Method used

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  • Fluorine-removing composite fiber membrane as well as preparation method and application thereof
  • Fluorine-removing composite fiber membrane as well as preparation method and application thereof
  • Fluorine-removing composite fiber membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Take 1 g of PVDF and 10 g of chitosan, add them into a mixed solvent composed of 10 g of acetic acid and 20 g of DMF, stir at room temperature for 5 hours, and obtain an electrospinning precursor solution.

[0048] 2) Take the precursor solution prepared above and carry out electrospinning on the electrospinning equipment. During the electrospinning process, the ambient temperature is 25°C, the relative humidity is 85%, the electrospinning voltage is 15kV, the collection distance is 15cm, and the electrospinning time is After 5 hours, the electrospun fiber membrane was collected and dried in a vacuum oven at 120°C for 24 hours to obtain a PVDF / chitosan composite fiber membrane. The SEM image is as follows: figure 1 (a) and (b) Figures.

[0049] 3) Take 1g of calcium chloride and 5g of sodium metapolyphosphate, add them to 20g of acetic acid solution (the mass fraction of acetic acid is 5%), and after stirring vigorously for 1h, prepare 11g of PVDF / chitosan composite ...

Embodiment 2

[0051] 1) Take 5 g of PVDF and 10 g of chitosan, add them into a mixed solvent composed of 20 g of acetic acid and 20 g of DMF, and stir for 1 h at room temperature to obtain an electrospinning precursor solution.

[0052] 2) Take the precursor solution prepared above and carry out electrospinning on the electrospinning equipment. During the electrospinning process, the ambient temperature is 100°C, the relative humidity is 60%, the electrospinning voltage is 30kV, the collection distance is 30cm, and the electrospinning time is After 2 hours, the electrospun fiber membrane was collected and dried in a vacuum oven at 120° C. for 24 hours to obtain a PVDF / chitosan composite fiber membrane.

[0053] 3) Take 1g of calcium chloride and 5g of sodium metapolyphosphate, add it to 20g of acetic acid solution (the mass fraction of acetic acid is 5%), and after stirring vigorously for 1h, prepare 15g of PVDF / chitosan composite fiber membrane at room temperature Add it to the above prepa...

Embodiment 3

[0055] 1) Take 5g of PVDF and 15g of chitosan, add them into a mixed solvent composed of 20g of acetic acid and 40g of DMF, and stir for 2 hours at room temperature to obtain an electrospinning precursor solution.

[0056] 2) Take the precursor solution prepared above and carry out electrospinning on the electrospinning equipment. During the electrospinning process, the ambient temperature is 80°C, the relative humidity is 75%, the electrospinning voltage is 15kV, the collection distance is 25cm, and the electrospinning time is After 15 hours, the electrospun fiber membrane was collected and dried in a vacuum oven at 120° C. for 24 hours to obtain a PVDF / chitosan composite fiber membrane.

[0057] 3) Take 5g of calcium chloride and 10g of sodium metapolyphosphate, add them to 40g of acetic acid solution (the mass fraction of acetic acid is 20%), and after stirring vigorously for 2 hours, prepare 20g of PVDF / chitosan composite fiber membrane at room temperature Add it to the ab...

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Abstract

The invention provides a preparation method of a defluorination composite fiber membrane, which comprises the following steps: carrying out electrostatic spinning by using polyvinylidene fluoride andchitosan as spinning raw materials to prepare a composite fiber membrane, and treating the obtained composite fiber membrane in a Ca<2+>-containing calcium source solution to obtain the defluorinationcomposite fiber membrane. The invention also provides the defluorination composite fiber membrane, and application, an activation method, and a regeneration method thereof. The defluorination composite fiber membrane provided by the invention has better adsorption performance and good regeneration performance, can be recycled for a long time, greatly saves the cost, and can be suitable for treating fluorine-containing water bodies in various fields and in various scales. The preparation method has the advantages of accessible raw materials, low cost and simple technique, and is suitable for large-scale industrial production and use.

Description

technical field [0001] The invention relates to the field of fluoride ion adsorption materials, in particular to a fluoride removal composite fiber membrane, its preparation method and application, and also relates to an activation method and regeneration method of the fluoride removal composite fiber membrane. Background technique [0002] In my country, as many as 1,306 counties (cities) suffer from endemic fluorosis. Among them, about 40.66 million people suffer from dental fluorosis, and about 2.6 million people suffer from skeletal fluorosis. Endemic diseases are closely related to environmental and geological factors, especially the groundwater environment. Excessive intake of fluorine in the human body is the main cause of endemic fluorosis. Therefore, endemic fluorosis should attract sufficient social attention. [0003] Adsorption is one of the effective methods for removing fluoride ions in drinking water because of its advantages of simple operation, low energy co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/26B01J20/30C02F1/28D01F8/10D01F8/18D06M11/155D04H1/728C02F101/14
CPCB01J20/28038B01J20/261B01J20/24D01F8/10D01F8/18D06M11/155C02F1/285C02F1/286D04H1/728D01D5/003C02F2101/14B01J2220/44
Inventor 潘金延卫何瑞敏王丽杨国锐
Owner SHENHUA SHENDONG COAL GRP
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