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Nano-loading zero-valent-iron-based PVDF (Polyvinylidene Fluoride) compound material as well as preparation method and application thereof

A composite material and nano-zero-valent technology, applied in the field of water treatment, can solve the problems of unsatisfactory catalytic degradation ability, easy loss and clogging of particles, easy aggregation of particles, etc., to achieve enhanced reusability, easy recycling, and good dispersion Effect

Inactive Publication Date: 2015-01-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0036] The purpose of the present invention is to provide a method for preparing a nanometer zero-valent iron-based PVDF composite material for water treatment. The functional material prepared by the method is a composite material loaded with nanometer zerovalent iron by a PVDF microporous filter membrane , the nano-zero-valent iron composite material can solve the problems of easy aggregation of zero-valent iron-based metals and bimetallic nanoparticles, unsatisfactory catalytic degradation ability, and easy loss and blockage of particles when they are directly used to repair the environment, and improve the degradation of nanocomposites Performance; at the same time provide better technical support for the deep purification and safety control of heavy metal ions, macromolecular dyes and inorganic anions in water

Method used

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  • Nano-loading zero-valent-iron-based PVDF (Polyvinylidene Fluoride) compound material as well as preparation method and application thereof
  • Nano-loading zero-valent-iron-based PVDF (Polyvinylidene Fluoride) compound material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0059] Embodiment 1: the preparation method of nanometer zero-valent iron-based PVDF composite material and the experiment of removing nitrate ions in water, the specific contents are as follows:

[0060] (1) First take a piece of PVDF microporous filter membrane and soak it in a clean beaker filled with absolute ethanol for 1 hour, then transfer it to a clean beaker filled with deionized water and soak for 48 hours, and replace the deionized water every 12 hours ; This step is to remove impurities in the PVDF microporous membrane, and make the membrane reach shrinkage balance, and also create corresponding conditions for the functionalization of the subsequent membrane to complete the pretreatment of the membrane;

[0061] (2) Prepare AA functional solution (a mixed aqueous solution containing 30 wt% AA, 2 wt% ethylene glycol and 1 wt% potassium persulfate), and then immerse the pretreated PVDF filter membrane in the above functional solution, After 4 min, the filter membrane...

Embodiment 2

[0068] Embodiment 2: the preparation method of nanometer zero-valent iron-based PVDF composite material and the experiment of removing methyl orange in water, the specific contents are as follows:

[0069] (1) First take a piece of PVDF microporous filter membrane and soak it in a clean beaker filled with absolute ethanol for 0.5 h, then transfer it to a clean beaker filled with deionized water for 36 h, and replace the deionized water every 12 h ;

[0070] (2) Prepare AA functional solution (a mixed aqueous solution containing 10wt% AA, 1 wt% ethylene glycol and 0.5 wt% potassium persulfate), and then immerse the pretreated PVDF filter membrane in the above functional solution, and take it out after 3 min filter membrane, and send the filter membrane to a vacuum drying oven at 90 °C for drying, then soak the functionalized PVDF filter membrane in deionized water for 36 h, and replace the deionized water every 12 h to remove excess components attached to the surface , this st...

Embodiment 3

[0076] Embodiment 3: the preparation method of nano zero-valent iron-based PVDF composite material and its removal of Cu in water 2+ Ion experiment, the specific content is as follows:

[0077] (1) First take a piece of PVDF microporous filter membrane and soak it in a clean beaker filled with absolute ethanol for 4 hours, then transfer it to a clean beaker filled with deionized water and soak for 72 hours, and replace the deionized water every 12 hours ;

[0078] (2) Prepare the AA functional solution (a mixed aqueous solution containing 50 wt% AA, 10 wt% ethylene glycol and 2 wt% potassium persulfate), and then immerse the pretreated PVDF filter membrane in the above functional solution, after 5 min Take out the filter membrane, and send the filter membrane to a vacuum drying oven at 120 °C for drying, then soak the functionalized PVDF filter membrane in deionized water for 72 h, and replace the deionized water every 12 h to remove excess particles attached to the surface. ...

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Abstract

The invention discloses a nano-loading zero-valent-iron-based PVDF (Polyvinylidene Fluoride) compound material as well as a preparation method and application thereof. The main preparation method comprises the following steps of: (1) pretreating a PVDF microfiltration membrane; (2) functioning the PVDF filter membrane by taking acrylic acid (AA) as a functional monomer; (3) respectively immersing the functioned PVDF filter membrane into sodium salt and soluble iron salt solutions for ion exchange, loading iron ions on the functioned PVDF filter membrane; and (4) immersing the PVDF filter membrane into a borohydride salt solution so as to prepare the nano-loading zero-valent-iron-based PVDF compound material under the strong reduction action. By respectively repairing simulative dyeing wastewater, heavy metal wastewater and anionic organic wastewater at the room temperature through using the reduction function of the material, the nano-loading zero-valent-iron-based PVDF compound material as well as the preparation method and the application thereof disclosed by the invention are conveniently and simply operated and easily recycled, have the advantages of low cost and good dispersity of nano iron particles, and are capable of reducing ecological risks caused by that the nano iron particles flow into water so as to improve the service cycle of the compound material. The nano-loading zero-valent-iron-based PVDF compound material can be regarded as an environment-friendly environment restoration material.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a nano zero-valent iron-loaded PVDF composite material for water treatment and a preparation method thereof, and the composite material is applied to the decolorization of dye wastewater and the removal of heavy metal ions and inorganic anions in wastewater. Background technique [0002] Laboratory and field tests in the past 15 years have shown that nano-ZVI particles, as an emerging engineering nanomaterial, exhibit superior removal and degradation capabilities in contaminated water and soil remediation. The so-called nano-iron particles refer to iron particles with a particle diameter of 1-100 nm. Compared with micron-sized iron particles, nano-iron particles have higher specific surface area and higher reactivity due to their small size; at the same time, iron itself has the characteristics of low cost and environmental friendliness, which is why it is widely used to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D67/00C02F1/44C02F103/30C02F101/20
Inventor 王向宇杨佳诚祝敏平
Owner KUNMING UNIV OF SCI & TECH
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