Preparation of MWCNTs reinforced zero-value nano iron/electrostatic spinning nano fiber felt

A zero-valent nano-iron and nano-fiber technology is applied in the directions of spinning solution preparation, fiber type, and fiber processing, which can solve the problems of increasing the mechanical strength of electrospinning polyacrylic acid nanofiber mats, and achieve improved mechanical strength and simple preparation method. , the effect of uniform dispersion

Inactive Publication Date: 2010-01-13
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The results of searching domestic and foreign literature and patents on electrospun nanofibers show that carbon nanotubes have not been found to be used as reinforcements to increase the mechanical strength of electrosp

Method used

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  • Preparation of MWCNTs reinforced zero-value nano iron/electrostatic spinning nano fiber felt
  • Preparation of MWCNTs reinforced zero-value nano iron/electrostatic spinning nano fiber felt
  • Preparation of MWCNTs reinforced zero-value nano iron/electrostatic spinning nano fiber felt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Take 10 mg of MWCNTs in a 1.5 mL centrifuge tube, add 1 mL of deionized water, and place it on an ultrasonic cleaner for 30 minutes to make the MWCNTs uniformly dispersed in the water for use.

[0052] Take 2.43261 g FeCl 3 ·6H 2 O, dissolved in deionized water, magnetically stirred to make it fully mixed evenly, and configured into transparent brown-yellow Fe with a concentration of 0.18mol / L 3+ Salt solution 50ml. Take 1.77801 grams of NaBH 4 , Dissolved in deionized water, stirred with a glass rod for several minutes to prepare 50ml of 0.94mol / L solution, and set aside.

[0053] Take 3 grams of polyvinyl alcohol (PVA) in a beaker, use deionized water as the solvent, place it on a magnetic stirrer and stir at 80°C for 3 hours to prepare an aqueous solution with a concentration of 10% by mass. use.

Embodiment 2

[0055] The uniformly dispersed MWCNTs in Example 1 were added to an aqueous solution of polyacrylic acid (PAA) with a concentration of 25% by mass, and ultrasonicated for 5 minutes to prepare a uniform PAA solution containing MWCNTs. Then add the PVA solution prepared in Example 1 to the PAA solution, and magnetically stir for 2 hours to prepare a 10 ml mixed solution with a total concentration of 10%, where the mass ratio of PAA to PVA is 1:1. Set the spinning process conditions as follows: the receiving distance is 25cm, the voltage is 16.6kV, and the flow rate is 0.5ml / h. The prepared nanofibers are finally deposited on the aluminum foil in the form of fiber mat. After the fiber mat is naturally dried in the air, it is stored in a desiccator.

[0056] The SEM test results show that the diameter of the nanofibers is distributed in the range of 150-400nm, the average diameter is 240nm, the fiber surface is smooth, the thickness is uniform, and the formed fiber mat presents a go...

Embodiment 3

[0058] A certain amount of the fiber mat prepared in Example 2 was heat-treated at 140-150° C. for 30 min, and the sample was cross-linked. After the sample was cooled to room temperature, it was immersed in deionized water. Observing the water stability of the fiber mat, it can be seen that the fiber has good water stability and can maintain the shape of the fiber mat in water. The fiber mat that has not been heat-treated will dissolve immediately after being immersed in water. Take a certain mass of cross-linked MWCNTs-reinforced PAA / PVA fiber mat soaked in Fe with a concentration of 0.18 mol / L as configured in Example 1. 3+ In the salt solution, the quality of the fiber mat and the Fe taken 3+ The volume ratio of the salt solution is configured to be 1 mg / mL. After soaking in iron salt solution for 3 hours, take it out, and wash it in deionized water 3 times for 3 minutes each time. The fiber felt changes from white to brown. Drop NaBH with a concentration of 0.94mol / L 4 Th...

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Abstract

The invention relates to a preparation of MWCNTs reinforced zero-value nano iron/electrostatic spinning nano fiber felt, comprising the following steps: (1) dissolving MWCNTs into deionized water and carrying out ultrasonic dispersion; (2) dissolving polyvinyl alcohol (PVA) in deionized water, to prepare PVA solution and cooling to room temperature; (3) preparing soluble iron salt solution, NaBH4 or KBH4 solution; (4) dripping the MWCNTs solution into PAA water solution, adding PVA solution, adjusting the pH value to be 2.5 to 4.5, preparing nano fiber felt in a spinning manner, carrying out heat treatment, soaking into the iron salt solution, dripping the reducing agent, namely NaBH4 or KBH4 solution, to the brown-yellow fiber, rinsing by 2 to 5 times, drying for 24 hours to 36 hours, to provide the MWCNTs reinforced zero-value nano iron/electrostatic spinning nano fiber felt. The invention has simple method and easy operation, the used polymers are all environment-friendly high-molecular materials, thereby being applicable to industrial production; and the obtained fiber has high mechanical property and can be used for removing the pollutants in the environment.

Description

Technical field [0001] The invention belongs to the field of preparation of MWCNTs / Nemi fiber felt, and particularly relates to the preparation of MWCNTs-reinforced zero-valent iron / electrospun nanofiber felt. Background technique [0002] "Electrospinning", also known as "electrospinning", is a new type of spinning method that uses electrostatic force to supplement or replace the mechanical force in the traditional spinning method to control fiber processing. Formhals proposed the first electrospinning patent in 1934: a device that uses fluid charge repulsion to stretch and prepare polymer fibers. However, the initial development did not attract enough attention. It was not until 1993 that the research team led by Reneker of Akron University in Ohio successfully prepared a variety of polymer nanofibers with this technology. This technology began to receive widespread attention. In recent years, electrospun nanofibers have been widely used in the field of biomedicine and filtrat...

Claims

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Application Information

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IPC IPC(8): D04H3/00D01D1/02D01D5/00D06M11/83D01F8/10D01F1/10D06M101/24D06M101/26D04H3/007
Inventor 史向阳肖仕丽王善元
Owner DONGHUA UNIV
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