In-situ preparation method for functional nullvalent nano-iron/polyelectrolyte composite fibrofelt

A technology of zero-valent nano-iron and composite fiber felt, which is applied in the direction of reduced water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of no discovery, preparation and fixation of zero-valent nano-iron particles, and achieve easy operation and preparation process simple effect

Inactive Publication Date: 2009-06-03
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Retrieval of literature and patents related to zero-valent nano-iron particles at home and abroad shows that: before the completion of the present invention, there has been no report on the preparation and fixation of zero-valent nano-iron particles using electrospun fiber felt as a matrix material

Method used

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  • In-situ preparation method for functional nullvalent nano-iron/polyelectrolyte composite fibrofelt
  • In-situ preparation method for functional nullvalent nano-iron/polyelectrolyte composite fibrofelt
  • In-situ preparation method for functional nullvalent nano-iron/polyelectrolyte composite fibrofelt

Examples

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Embodiment 1

[0048] Example 1 is a control experiment of the present invention, without in-situ synthesis of zero-valent nano-iron particles by electrospinning polyacrylic acid-containing nanofibers.

[0049] Example 1

[0050] Take 2.43261 grams of FeCl 3 ·6H 2 O, dissolved in deionized water, magnetically stirred to make it fully mixed, and configured as a transparent brown-yellow Fe with a concentration of 0.18mol / L 3+ Saline solution 50mL. Take 1.77801 g NaBH 4 , dissolved in deionized water, stirred for several minutes with a glass rod, and made into 50ml of a 0.94mol / L solution. Take 50mlNaBH 4 The solution was added dropwise to a container filled with 50ml Fe 3+ Put the solution in the beaker of the salt solution, and stir it magnetically at the same time, and stop stirring after the solution turns black. After the black substance quickly settles to the bottom of the cup, remove the supernatant in the beaker, add a large amount of deionized water to wash, and then remove the ...

Embodiment 2

[0052] Take 3 grams of polyvinyl alcohol (PVA) in a beaker, use deionized water as a solvent, place on a magnetic stirrer and stir for 3 hours at a temperature of 80° C. to form a 10% aqueous solution, and cool it for use. Weigh a certain concentration of 25% polyacrylic acid (PAA) aqueous solution and the prepared PVA solution to form a 12mL mixed solution with a total concentration of 8% of the two polymers, wherein the weight ratio of PAA / PVA is 1:1. The spinning process conditions are set as follows: the receiving distance is 20cm, the voltage is 16.6kV, and the flow rate is 0.5mL / h. The prepared nanofibers were finally deposited on aluminum foil in the form of fiber mats. After the fiber mat is dried naturally in the air, it is stored in a desiccator.

[0053] SEM test results show that the diameter of the nanofibers is distributed between 100 and 400nm, the thickness is uneven, and there are a certain amount of beads, some fibers are flat ribbons, the surface of the fib...

Embodiment 3

[0055] Take 3 grams of polyvinyl alcohol (PVA) in a beaker, use deionized water as a solvent, place on a magnetic stirrer and stir for 3 hours at a temperature of 80° C. to form a 10% aqueous solution, and cool it for use. Weigh a certain concentration of 25% polyacrylic acid (PAA) aqueous solution and the prepared PVA solution to form a 12mL mixed solution with a total concentration of 10%, wherein the weight ratio of PAA / PVA is 1:1. The spinning process conditions are set as follows: the receiving distance is 20cm, the voltage is 16.6kV, and the flow rate is 0.5mL / h. The prepared nanofibers are finally deposited on aluminum foil in the form of fiber mats, and the fiber mats are naturally dried in the air and stored in a desiccator.

[0056] The test result of SEM shows that the diameter of nanofibers is mainly concentrated in 100-200nm, and the average diameter is 205nm. There are a few fibers with larger diameters, the single fiber is uniform in thickness, there is basical...

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Abstract

The invention relates to an in-situ preparation method for a functional nullvalent nanometer iron/polyelectrolyte composite fibrofelt. The method comprises the following steps: (1) preparing polyelectrolyte mixed solution with concentration between 7 and 12 percent by polyacrylic acid PAA, and preparing a nanometer fibrofelt according to a principle of electrostatic spinning; (2) carrying out heat treatment on the nanometer fibrofelt to prepare a water-fast polyelectrolyte fibrofelt; (3) preparing soluble iron salt solution, and preparing reducing agent solution with concentration 4 to 6 times of the iron salt solution; (4) dipping the (2) in the iron salt solution; (5) rinsing; (6) dripping the reducing agent solution onto the complex iron ion fibrofelt; (7) rinsing by deionized water; (8) drying and storing. In the fibrofelt prepared by the method, nanometer iron particles are dispersed evenly without aggregation phenomenon, and the fibrofelt can effectively fix nanometer iron particles, thereby ensuring effective recycle of the nanometer iron particles in practical application without secondary pollution.

Description

technical field [0001] The invention belongs to the field of preparation of zero-valent nano-iron particles, in particular to an in-situ preparation method of functional zero-valent nano-iron / polyelectrolyte composite fiber felt. Background technique [0002] With the continuous improvement of environmental restoration technology, the research of various new restoration materials has attracted more and more attention. Nanoscale materials are favored by researchers from all walks of life because of their completely different physical and chemical properties from the corresponding bulk materials. In the field of environmental science, research on nanomaterials as a highly active adsorbent, catalyst and reactant in pollution prevention and treatment, especially in water pollution treatment, is increasing. Among the many nano-environment restoration materials, nano-scale zero-valent iron has a large specific surface area, excellent surface adsorption capacity and chemical react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/28
Inventor 史向阳肖仕丽王善元
Owner DONGHUA UNIV
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