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Nano-crystalline Fe*O* particles with high absorption capacity and preparation method thereof

A nano-crystal and nano-grain technology is applied in the field of material science to achieve the effects of improved adsorption capacity, high magnetization and simple preparation method

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

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Problems solved by technology

[0004] Li Huidong et al. from Hunan Normal University (Document 1: Li H.D., Li Z., Liu T., Xiao X., Peng Z.H., DengL., A new technology for adsorption and recovery of hexavalent Cr in wastewater using biofunctional magnetic materials, Bioresource Technology 99, 6271-6279 (2008)) prepared Fe with polyvinyl alcohol coating 3 o 4 The average particle size of the particles is about 20nm. This kind of particles has a selective absorption effect on the toxic metal ion Cr(VI) in the wastewater, but its saturated adsorption capacity is only 5.79mg / g

Method used

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  • Nano-crystalline Fe*O* particles with high absorption capacity and preparation method thereof
  • Nano-crystalline Fe*O* particles with high absorption capacity and preparation method thereof
  • Nano-crystalline Fe*O* particles with high absorption capacity and preparation method thereof

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Embodiment 1

[0026] Prepare a mixed solution containing ferric ions and ferrous ions in a container, and Fe in the mixed solution 2+ with Fe 3+ The molar ratio of Fe 2+ : Fe 3+ =1:1.75, the concentration of all iron ions (ferric ions and ferrous ions) is 0.1mol / l, add precipitant ammonia solution under stirring and nitrogen atmosphere, the stirring speed is 800rpm, and the nitrogen flow rate is 2Nm 3 / h, the concentration of the ammonia solution is 0.5mol / l, the amount added is based on the pH of the mixed solution after adding the ammonia solution; after adding the ammonia solution, emit ultrasonic waves to the mixed solution for ultrasonic dispersion for 1h, the frequency of the ultrasonic wave is 20±1kHz, the power It is 80W.

[0027] After the ultrasonic dispersion is completed, seal the reaction container with plastic wrap, and open a nitrogen flow port on the plastic wrap; heat the reaction container to 60±5°C in a water bath, feed nitrogen into the reaction container and continue...

Embodiment 2

[0043] Prepare a mixed solution containing ferric ions and ferrous ions in a container, and Fe in the mixed solution 2+ with Fe 3+ The molar ratio of Fe 2+ : Fe 3+ =1:1.5, the concentration of all iron ions (ferric ions and ferrous ions) is 0.25mol / l, add precipitant ammonia solution under stirring and nitrogen atmosphere, the stirring speed is 700rpm, and the nitrogen flow rate is 1.5Nm 3 / h, the concentration of the ammonia solution is 1mol / l, the amount added is based on the pH of the mixed solution after adding the ammonia solution; after adding the ammonia solution, emit ultrasonic waves to the mixed solution for ultrasonic dispersion for 1.5h, the frequency of the ultrasonic wave is 20±1kHz, the power 50W.

[0044] After the ultrasonic dispersion is completed, seal the reaction container with plastic wrap, and open a nitrogen flow port on the plastic wrap; heat the reaction container to 60±5°C in a water bath, feed nitrogen into the reaction container and continue sti...

Embodiment 3

[0049] Prepare a mixed solution containing ferric ions and ferrous ions in a container, and Fe in the mixed solution 2+ with Fe 3+ The molar ratio of Fe 2+ : Fe 3+ =1:1.25, the concentration of all iron ions (ferric ions and ferrous ions) is 0.5mol / l, add precipitant ammonia solution under stirring and nitrogen atmosphere, the stirring speed is 1000rpm, and the nitrogen flow rate is 2.5Nm 3 / h, the concentration of the ammonia solution is 2mol / l, the amount added is based on the pH of the mixed solution after adding the ammonia solution; after adding the ammonia solution, emit ultrasonic waves to the mixed solution for ultrasonic dispersion for 2h, the frequency of the ultrasonic wave is 20 ± 1kHz, and the power is 20W.

[0050]After the ultrasonic dispersion is completed, seal the reaction vessel with plastic wrap, and open a nitrogen flow port on the plastic wrap; heat the reaction vessel to 60±5°C in a water bath, feed nitrogen into the reaction vessel and continue stirr...

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Abstract

The invention relates to nano-crystalline Fe3O4 particles with high absorption capacity and a preparation method thereof which belong to the field of material science. The microstructure of the particles comprises equiaxed nano-grains, and the particle size of the nano-grains is 5-100nm; the average particle size is 8-25nm, and the saturated magnetization MS is 6.7-7.2 multiplied by 10<minus 3>A / m. The preparation method is as follows: solution containing ferric ions and ferrous ions is prepared, ammonia solution is added under nitrogen atmosphere, ultrasonic waves are transmitted to carry out the ultrasonic dispersion, and heating, stirring and reaction are carried out; solids are washed till neutral by water under the condition of a magnetic field; water is removed by drying after the centrifugal separation. The invention utilizes the simple chemical reaction co-precipitation technology and combines the ultrasonic stirring, the centrifugal separation, the vacuum drying and other technologies to obtain the Fe3O4 powder materials with the average particle size of 8-25nm and the higher saturated magnetization.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a nanocrystalline Fe with high adsorption capacity 3 o 4 Microparticles and methods of preparation. Background technique [0002] As one of the main sources of water pollution, toxic heavy metals have very harmful effects on human life and the environment. The extraction and separation of metals, such as smelting of ores, electroplating with Cr and Cd systems, and preparation of nuclear fuels, will cause serious pollution to the environment due to heavy metals or their compounds entering soil, mud, and water through deposition or ion exchange. Hazardous heavy metals do not decompose like organic pollutants, making it more challenging to eliminate their harmful effects on humans and the environment. Minamata disease caused by environmental pollution caused by heavy metal Hg is one of the typical cases. Among the toxic heavy metals, Cr, Cu, Cd and Ni are the most harmful to the ...

Claims

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Application Information

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IPC IPC(8): C01G49/08B01J20/06
Inventor 申勇峰唐坚周芳王沿东左良
Owner NORTHEASTERN UNIV
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