Preparation method and application of nano iron-based polyether sulfone (PES) organic-inorganic composite material

An inorganic composite material and nano-iron technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult recovery and regeneration of nanoparticles, poor stability, and easy oxidation. Achieve long-lasting and efficient repair ability, low cost, and cost-friendly effects

Inactive Publication Date: 2013-09-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The primary purpose of the present invention is to provide a green preparation method of nano-iron-based PES organic-inorganic composite material, which belongs to the field of green preparation technology of nano-composite materials, can solve the problem that nanoparticles are difficult to recycle and regenerate, and can effectively fix nano-iron particles and improve the ability of nano zero-valent iron particles to repair the environment, and provide better technical support for the advanced treatment and purification of wastewater containing various pollutants; the organic-inorganic composite material prepared by the method of the present invention is made of organic PES micropores Composed of a filter membrane and inorganic nano-zero-valent iron particles immobilized on its surface, the nano-iron-based PES organic-inorganic composite material can effectively solve the problem of easy oxidation and stability of nano-zero-valent iron-based metal particles when they are directly used in environmental pollution control and environmental restoration. Problems of poor sex and easy reunion

Method used

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  • Preparation method and application of nano iron-based polyether sulfone (PES) organic-inorganic composite material
  • Preparation method and application of nano iron-based polyether sulfone (PES) organic-inorganic composite material
  • Preparation method and application of nano iron-based polyether sulfone (PES) organic-inorganic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 : the preparation method of nanometer zero-valent iron particle, this embodiment is the contrast test of the inventive method, and specific content is as follows:

[0035] (1) Weigh 8.3406 grams of FeSO 4 .7H 2 O powder was then transferred to a clean beaker filled with deionized water, and magnetically stirred to fully dissolve it, and the FeSO with a molar concentration of 0.15 M was prepared. 4 Solution 200 mL, spare;

[0036] (2) Weigh another 9.711 grams of KBH 4 powder, dissolved in deionized water, stirred with a glass rod for several minutes, and made into KBH with a molar concentration of 0.9 M 4 200 mL of the solution, then transferred to a 250 mL pear-shaped separatory funnel for later use;

[0037] (3) Put the solutions prepared in steps (1) and (2) and the required materials into the anaerobic box, and put the KBH 4 The pear-shaped separatory funnel of the solution was fixed on an iron stand, and nitrogen was passed through for 60 min to remo...

Embodiment 2

[0039] Example 2 : The preparation method of the nano iron-based PES organic-inorganic composite material, the specific content is as follows:

[0040] (1) First take a piece of PES microporous filter membrane (diameter, pore size and thickness are 5 cm, 0.45 μm and 100 μm, respectively) into a clean beaker filled with deionized water for 60 h, replace the deionized membrane every 12 h water;

[0041] (2) Prepare the MA functionalization solution consisting of a mixed aqueous solution of 25 wt% MA, 4 wt% polyethylene glycol 200 and 0.8 wt% ammonium persulfate, and then completely immerse the pretreated PES microporous filter membrane into the above functionalized The solution was taken out after 8 min, and the microporous membrane was sent to a vacuum drying oven at 75 °C for drying, and then the functionalized PES microporous membrane was soaked in deionized water for 36 h, and the deionized water was replaced every 12 h. The purpose is to remove unreacted monomers and oth...

Embodiment 3

[0047] Example 3 : Investigation on the stability of nano-iron-based PES organic-inorganic composites and the degradation of metronidazole in water, the specific contents are as follows:

[0048] (1) Investigate the stability of nano-iron-based PES organic-inorganic composite materials: prepare nano-iron-based PES organic-inorganic composite materials according to the method described in Example 2, and then place them in deionized water with pH=3, and Record the color of the membrane at this time, and observe and record after intervals of 10 days, 20 days, 30 days and 60 days. After 30 days and 60 days, the color of the film surface hardly changed, and all were black, while the nanometer zero-valent iron particles prepared by the preparation method described in Example 1 were all oxidized after soaking in the above-mentioned deionized water for 2 h. It shows that the composite material prepared by reduction with green tea aqueous solution has high oxidation resistance in aci...

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Abstract

The invention discloses a method for preparing a nano iron-based polyether sulfone (PES) organic-inorganic composite material. The method comprises the following steps: (1) pretreating a PES microfiltration membrane; (2) functionalizing the PES microfiltration membrane through methacrylic acid (MA); (3) respectively performing sodium ion exchange and iron ion exchange on the functionalized PES microfiltration membrane; (4) completely soaking the PES microfiltration membrane containing iron ions in an aqueous solution of green tea, so as to form the nano iron-based PES organic-inorganic composite material through the reducing action of the aqueous solution of the green tea. By utilizing the reducing action of the materials, wastewater containing antibiotics, bromate ions, bromo-organic matters and chloro-organic matters is respectively repaired under room temperature conditions. The method is low in process cost, and easy to operate and has the environment-friendly effects, the prepared organic-inorganic composite material is high in degradation capacity, high in stability and long in service cycle, and the composite material can effectively fix iron nanoparticles, is easy to recover and regenerate, belongs to an environment-friendly functional material and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials, and relates to a green preparation method of a nanometer iron-based PES organic-inorganic composite material, and the composite material is applied to the treatment of antibiotics, bromate ions, brominated organic substances and chlorinated organic substances in wastewater. Background technique [0002] Nano-zero valent iron is the most widely used engineering nanomaterial for repairing polluted groundwater and soil. As an efficient reducing agent, nano-zero valent iron has small size, high specific surface area, good reactivity, Due to its low cost and environmental friendliness, it is widely used to remove heavy metals, chlorinated organics, macromolecular dyes, and inorganic anions in groundwater and soil. However, due to the high reactivity, specific surface area and inherent magnetism of nano-zero-valent iron, when nano-zero-valent iron is used in environmental res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/58
Inventor 王向宇杨佳诚祝敏平
Owner KUNMING UNIV OF SCI & TECH
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