Preparation method for heavy metal negative ion-removed porous nanometer composite fiber membrane

A technology of nanocomposite fibers and nanofiber membranes, applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc. Easy to reunite, difficult to recycle and other problems, to meet the requirements of emergency treatment, high adsorption capacity, easy to control the effect

Inactive Publication Date: 2017-07-18
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional adsorbent particles, such as microspheres, are generally in the micron range in diameter. Although this type of adsorbent has a good adsorption and removal effect on heavy metal pollutants, the adsorption process usually takes 24 hours to reach equilibrium.
In recent years, nanoparticles have become a new type of adsorbent. Because of their small particle size and large specific surface area, they have the characteristics of fast adsorption speed. However, nanoparticles are easy to agglomerate, deposit and are difficult to recycle, which limits their wide application.
Therefore, the current granular adsorbents cannot meet the requirements for emergency treatment of heavy metal water pollution.

Method used

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  • Preparation method for heavy metal negative ion-removed porous nanometer composite fiber membrane
  • Preparation method for heavy metal negative ion-removed porous nanometer composite fiber membrane
  • Preparation method for heavy metal negative ion-removed porous nanometer composite fiber membrane

Examples

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Effect test

Embodiment 1

[0039] A porous nanocomposite fiber membrane X1 for removing heavy metal anions is prepared by the following method:

[0040]1) Weigh 0.9g of polyacrylonitrile and 4.5g of polyethylene glycol into 10mL of N,N-dimethylformamide, stir well, transfer to a glass syringe, and set the spinning voltage of the spinning equipment to 13kv , the flow rate is 0.8mL / h, the collection distance is 15cm, the nanofiber membrane matrix is ​​prepared by high-voltage electrospinning technology, soaked in ultrapure water ultrasonically, washed to remove the residual porogen, and then dried to prepare a porous nanofiber membrane matrix , this matrix is ​​marked as X10;

[0041] 2) Weigh 1g of ammonium molybdate, 1g of thioacetylammonium and 0.25g of silicotungstic acid, put them in a mixed solvent (volume ratio of 1:1) prepared by 50mL of ethanol and water, ultrasonically dissolve and mix well, and seal the solution. And put it in a constant temperature drying oven, raise the temperature to 180°C,...

Embodiment 2

[0045] A porous nanocomposite fiber membrane X2 for removing heavy metal anions is prepared by the following method:

[0046] 1) Weigh 1.5g of polyacrylonitrile and 3.75g of polyethylene glycol into 10mL N,N-dimethylformamide, stir evenly, transfer to a glass syringe, set the spinning voltage to 18kV, the spinning liquid The flow rate is 1.6mL / h, and the collection distance is 20cm. The nanofiber membrane matrix is ​​prepared by high-voltage electrospinning technology, soaked in ultra-pure water ultrasonically, washed to remove the residual porogen, and then dried to prepare a porous nanofiber membrane matrix;

[0047] 2) Weigh 2g of ammonium molybdate, 2g of thioacetylammonium and 0.5g of silicotungstic acid, put them in a mixed solvent (volume ratio of 1:1) prepared by 50mL of ethanol and water, ultrasonically dissolve and mix well, and seal the solution. And put it in a constant temperature drying oven, raise the temperature to 200°C, perform a hydrothermal reaction for 12 ...

Embodiment 3

[0051] A porous nanocomposite fiber membrane X3 for removing heavy metal anions is prepared by the following method:

[0052] 1) Weigh 2g of polyacrylonitrile, add 1g of polyethylene glycol into 10mL N,N-dimethylformamide, stir evenly, transfer to a glass syringe, set the spinning voltage to 25kV, and the flow rate of the spinning liquid to 2.5mL / h, the collection distance is 25cm, the nanofiber membrane matrix is ​​prepared by high-voltage electrospinning technology, soaked in ultrapure water ultrasonically, washed to remove the residual porogen, and then dried to prepare a porous nanofiber membrane matrix;

[0053] 2) Weigh 3g of ammonium molybdate, 3g of thioacetamide ammonium and 1g of silicotungstic acid, put them in 50mL of ethanol and water mixed solvent (1:1 volume ratio), ultrasonically dissolve and mix well, seal the solution, and Place in a constant temperature drying oven, heat up to 240°C, perform hydrothermal reaction for 24 hours, cool to room temperature, wash ...

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Abstract

The invention discloses a preparation method for a heavy metal negative ion-removed porous nanometer composite fiber membrane. The preparation method comprises the following steps: dissolving a pore-foaming agent and a high-molecular polymer in an organic solvent; preparing a porous nanometer fiber membrane substrate through a high-pressure electrostatic spinning technology, synthesizing molybdenum disulfide nanoparticles with a hydrothermal method, uniformly mixing the molybdenum disulfide nanoparticles with a high-molecular polymer monomer, and adding a mixture into a strongly-acidic alcohol aqueous solution; under the action of an oxidizing agent, carrying out an in-situ polymerizing reaction to prepare the porous nanometer composite fiber membrane. The preparation method for the porous nanometer composite fiber membrane disclosed by the invention only needs to carry out three steps, has high yield, is easy to regulate and control, and is suitable for industrial production; heavy metal negative ions can be removed rapidly and efficiently within 30 minutes, so that the heavy metal negative ion-removed porous nanometer composite fiber membrane is 7mmol/g in maximum adsorption quantity, has high interference resistance, can be repeatedly used, and has a wide application prospect on the aspect of water environment pollution.

Description

technical field [0001] The invention belongs to the field of heavy metal water treatment, and in particular relates to a preparation method of a porous nanocomposite fiber membrane for removing heavy metal anions. The invention also relates to a method for rapidly removing heavy metal anions by using the nanofiber membrane. Background technique [0002] In recent years, the damage and losses caused by major sudden water pollution accidents in our country to the ecological environment and social economy cannot be ignored. Compared with ordinary water pollution, sudden heavy metal water pollution incidents have no fixed discharge methods and discharge channels, and the time and location of the incidents have great uncertainty. Once the pollution enters the water [0003] It spreads quickly and causes a wider range of environmental hazards. Most heavy metals such as copper, lead, and cadmium exist in the form of cations in the water environment, while heavy metals such as chr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/264B01J20/0218B01J20/0285B01J20/28004B01J20/28038B01J20/28095C02F1/288C02F2101/20
Inventor 刘福强邱金丽朱长青赵伟仇欢凌晨李爱民
Owner NANJING UNIV
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