Preparation method of magnetic Fe3O4 nanoparticles and its application in adsorption and separation of heavy metal ions

A heavy metal ion, nanoparticle technology, applied in nanotechnology, chemical instruments and methods, other chemical processes, etc., can solve the problems of expensive raw materials, high production costs, difficult control of reaction conditions, etc., and achieve simple synthesis methods and good adsorption. Features, low-cost and easy-to-obtain raw materials

Inactive Publication Date: 2011-12-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-mentioned magnetic nanoparticles used are all synthesized by organic pyrolysis, the re

Method used

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  • Preparation method of magnetic Fe3O4 nanoparticles and its application in adsorption and separation of heavy metal ions
  • Preparation method of magnetic Fe3O4 nanoparticles and its application in adsorption and separation of heavy metal ions
  • Preparation method of magnetic Fe3O4 nanoparticles and its application in adsorption and separation of heavy metal ions

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Experimental program
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Effect test

Embodiment 1

[0025] Magnetic Fe 3 o 4 The preparation method of nanoparticles adopts a hydrothermal synthesis method, using water as a solvent, and the specific steps are:

[0026] 1) Add 0.27gFeCl 3 ·6H 2 O was dissolved in 40.5mL of water to obtain an aqueous ferric chloride solution, and then 0.162g of ascorbic acid was added to obtain a solution;

[0027] 2) Add 1 mL of hydrazine hydrate to the solution obtained in step 1), then transfer to a stainless steel reactor and react at 140°C for 24 hours. After the reaction, centrifuge at 4500 rpm for 30 minutes to obtain a precipitate. The obtained The precipitate was washed 3 times alternately with ethanol and water, and dried in a vacuum oven at 40 °C for 8 h to obtain magnetic Fe 3 o 4 Nanoparticles, which are spherical, have a particle size of 3±1nm, and their transmission electron microscope pictures are as follows: figure 1 As shown, the high-resolution transmission electron microscope picture is shown as figure 2 shown.

[00...

Embodiment 2

[0031] Magnetic Fe 3 o 4 The preparation method of nanoparticles adopts a hydrothermal synthesis method, using water as a solvent, and the specific steps are:

[0032] 1) Add 0.27gFeCl 3 ·6H 2 O was dissolved in 40mL of water to obtain an aqueous ferric chloride solution, and then 0.405g of ascorbic acid was added to obtain a solution;

[0033] 2) Add 1.5mL of hydrazine hydrate to the solution obtained in step 1), then transfer to a stainless steel reactor and react at 160°C for 12 hours. After the reaction, centrifuge at a speed of 4500 rpm for 30 minutes to obtain a precipitate, which will be obtained The precipitate was alternately washed 3 times with ethanol and water, and dried in a vacuum oven at 50 °C for 6 h to obtain magnetic Fe 3 o 4 Nanoparticles, for the cubic phase of ferroferric oxide, its X-ray diffraction pattern is as follows Image 6 shown. Test instrument model: XRD-6000; test conditions: scan range 10-70°, scan rate 0.02 / s -1 .

[0034] 7 mg of mag...

Embodiment 3

[0037] Magnetic Fe 3 o 4 The preparation method of nanoparticles adopts a hydrothermal synthesis method, using water as a solvent, and the specific steps are:

[0038] 1) Add 0.27gFeCl 3 ·6H 2 O was dissolved in 40 mL of water to obtain an aqueous solution of ferric chloride, and then 0.54 g of ascorbic acid was added to obtain a solution;

[0039] 2) Add 2.6mL of hydrazine hydrate to the solution obtained in step 1), then transfer to a stainless steel reactor and react at 200°C for 6 hours. After the reaction, centrifuge at 4500 rpm for 30 minutes to obtain a precipitate, which will be obtained The precipitate was alternately washed 3 times with ethanol and water, and dried in a vacuum oven at 60 °C for 4 h to obtain magnetic Fe 3 o 4 Nanoparticles, whose hysteresis loop at room temperature is as Figure 8 As shown, it can be seen from the figure that the obtained magnetic Fe 3 o 4 Nanoparticles exhibit superparamagnetism with a saturation magnetic susceptibility clos...

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Abstract

The invention relates to a preparation method of magnetic Fe3O4 nanoparticles and application thereof in adsorption and separation of heavy metal ions, belonging to the technical field of nanomaterials as well as adsorption and separation treatment application of heavy metal ions in industrial and agricultural wastewater. The preparation method comprises the following steps: firstly preparing a ferric chloride solution with water used as a solvent by using a hydrothermal synthesis method, and then adding ascorbic acid to obtain a solution; and adding hydrazine hydrate to the resulting solution, then transferring to a stainless steel reaction kettle to react, after the reaction is finished, centrifugally separating, and washing and drying the obtained precipitate to obtain the magnetic Fe3O4 nanoparticles. The preparation method provided by the invention has the advantages of inexpensive and easily available raw materials and simple synthesis method; Fe3O4 prepared by the preparation method has good adsorption property to As and Cr metal ions, and the removal rate can be more than 90%; and the obtained magnetic Fe3O4 nanoparticles can be widely used in adsorption and separation of As and Cr in the industrial and agricultural wastewater.

Description

technical field [0001] The present invention relates to magnetic Fe 3 o 4 The preparation method of nano particles and its application in adsorption and separation of heavy metal ions belong to the technical fields of chemistry, nanometer material science and technology, and the application of adsorption and separation treatment of heavy metal ions in industrial and agricultural wastewater. Background technique [0002] Heavy metals generally exist in nature in natural concentrations. However, due to the increasing mining, smelting, processing and commercial manufacturing activities of heavy metals, heavy metals such as arsenic and chromium enter the atmosphere, water and soil, causing serious environmental pollution. Heavy metals that exist in various chemical states or chemical forms will persist, accumulate and migrate after entering the environment or ecosystem, causing harm. For example, heavy metals discharged with wastewater, even if the concentration is small, can ...

Claims

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Application Information

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IPC IPC(8): C01G49/08B82Y40/00B01J20/02
Inventor 胡长文冯力蕴孔祥伟曹敏花暴丽霞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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