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A nanofibrous membrane for adsorbing heavy metal ions and its preparation method

A nanofiber membrane, a technology for adsorbing heavy metals, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem that the adsorption performance of nanofiber membranes for heavy metal ions cannot be combined, reduce the filtration effect of aqueous solutions, and membrane equipment Improve the tensile strength and elongation at break, strong stress resistance, and good biocompatibility

Active Publication Date: 2020-09-01
ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Water treatment membranes are mostly made of polyester materials, however, polyester has poor hydrophilicity, thus reducing the filtration effect on aqueous solutions
At the same time, membrane fouling caused by concentration polarization and membrane pore clogging leads to reduced reliability of membrane equipment and greatly limits its development. Improving the hydrophilicity of nanofibrous membranes plays an important role in improving the adsorption efficiency of heavy metal ions
The preparation method for improving the membrane has been disclosed in the prior art. However, the hydrophilicity of the prepared nanofibrous membrane and the good adsorption performance of heavy metal ions cannot be combined. Therefore, it is necessary to further improve the membrane material with excellent comprehensive performance. to develop

Method used

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  • A nanofibrous membrane for adsorbing heavy metal ions and its preparation method
  • A nanofibrous membrane for adsorbing heavy metal ions and its preparation method

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Effect test

Embodiment 1

[0031] A method for preparing a nanofibrous membrane for adsorbing heavy metal ions, comprising the following steps:

[0032] (1) Preparation of modified polyterephthalic acid raw materials

[0033] To 60 parts of polyethylene terephthalate and polytrimethylene terephthalate with a mass ratio of 1:1, add 5 times the weight of m-cresol solution, and then add 10 parts of the mass ratio of 1:2 Glycidyl acrylate and maleic anhydride were stirred and reacted for 40 minutes at a temperature of 20° C. to obtain a modified polyterephthalic acid raw material; the melt index of the modified polyterephthalic acid raw material was 2.5 g / 10min;

[0034] (2) Preparation of fiber membrane masterbatch

[0035] Add 40 parts of the modified polyterephthalic acid raw materials prepared in step (1) into a mixed solution of dichloromethane and trifluoroacetic acid with a volume ratio of 1:4, and dissolve for 1 hour under the action of magnetic stirring, and the modified The polyterephthalic ac...

Embodiment 2

[0046] A method for preparing a nanofibrous membrane for adsorbing heavy metal ions, comprising the following steps:

[0047] (1) Preparation of modified polyterephthalic acid raw materials

[0048] To 80 parts of polyethylene terephthalate, polytrimethylene terephthalate and polybutylene terephthalate with a mass ratio of 1:1:1, add 8 times the weight of m-cresol solution , then add 15 parts of glycidyl acrylate, maleic anhydride, and isocyanate with a mass ratio of 1:1:1, and stir and react for 50 minutes at a temperature of 28° C. to obtain a modified polyterephthalic acid raw material; The melt index of the modified polyterephthalic acid raw material is 3.5g / 10min;

[0049] (2) Preparation of fiber membrane masterbatch

[0050] Add 55 parts of the modified polyterephthalic acid raw materials prepared in step (1) into the mixed solution of dichloromethane and trifluoroacetic acid with a volume ratio of 1:4, dissolve for 2 hours under the action of magnetic stirring, and t...

Embodiment 3

[0061] A method for preparing a nanofibrous membrane for adsorbing heavy metal ions, comprising the following steps:

[0062] (1) Preparation of modified polyterephthalic acid raw materials

[0063] To 70 parts of polyethylene terephthalate and polybutylene terephthalate with a mass ratio of 1:1, add 6 times the weight of the m-cresol solution, and then add 12 parts of the mass ratio of 1 : 1 maleic anhydride and isocyanate, stirred and reacted for 45min at a temperature of 25°C to obtain a modified polyterephthalic acid raw material; the melt index of the modified polyterephthalic acid raw material is 3g / 10min;

[0064] (2) Preparation of fiber membrane masterbatch

[0065] Add 50 parts of the modified polyethylene terephthalic acid raw material prepared in step (1) into a mixed solution of dichloromethane and trifluoroacetic acid with a volume ratio of 1:4, and dissolve it for 1.5 hours under the action of magnetic stirring, and the modified The permanent poly terephthalic...

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Abstract

The invention provides a nanofiber membrane for adsorbing heavy metal ions and a preparation method of the nanofiber membrane. The preparation method comprises the following steps that 1, a modified polyethylene terephthalate raw material is prepared; 2, fiber membrane master batch is prepared; 3, a modified thin film material is prepared; 4, the nano-fiber membrane is prepared. The prepared nanofiber membrane is relatively high in mechanical strength, good in hydrophilicity and good in inhibition effect on escherichia coli and staphylococcus aureus. The heavy metal ions are adsorbed through an aqueous solution containing the heavy metal ions, and the rate of adsorbing the heavy metal ions through the nanofiber membrane prepared through the method can reach 90% or above, so that the prepared nanofiber membrane has a good adsorption effect on the heavy metal ions, and has a wide application prospect in the aspect of removing the heavy metal ions in the aqueous solution.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a nanofibrous membrane for absorbing heavy metal ions and a preparation method thereof. Background technique [0002] With the continuous acceleration of the industrialization process, the problem of heavy metal ion pollution of water sources caused by human factors such as metal smelting and chemical production wastewater discharge has become increasingly serious, seriously threatening human health. For this reason, relevant scientific researchers have conducted in-depth research on the pollution of heavy metal ions, and have adopted various measures to treat and restore the polluted water bodies. At present, the methods reported to remove heavy metal ions in water include: reverse osmosis, ion exchange, electrochemical precipitation, redox, biological treatment and adsorption technology. Among them, adsorption technology has attracted much attention becau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/262B01J20/265C02F1/285C02F2101/20
Inventor 李惠林冯均军沈勘力史闵新
Owner ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD