Preparation method for slow-release-type nanometer zero-valent iron particles

A nano-zero-valent iron, slow-release technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of easy agglomeration, high equipment requirements, slow release, etc., to achieve good results Dispersion and reactivity, simple preparation process, long-term effective control effect

Inactive Publication Date: 2016-01-20
深圳碳星水务科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-zero-valent iron prepared by the gas-phase method has the advantages of small particle size and high purity, but this method requires relatively high equipment and is difficult to operate; the solid-phase method has a relatively simple process, but the prepared nano-zero-valent iron has poor dispersion and is prone to reunion
The liquid phase method is the most widely used, and can produce nano-zero-valent iron with good dispersion performance, but the stability of nano-zero-valent iron in the air before use has not been solved; at the same time, due to the adsorption of pollutants in groundwater and soil on soil particles On the surface, the release is relatively slow, and a large amount of nano-zero-valent iron is released at one time, resulting in waste of materials and unable to control the polluted site for a long time
In the previous research of this patent, natural polymer substances such as chitosan and guar gum were used to coat the surface of nano-zero-valent iron, which solved the stability problem of the material in the air and avoided the coating Secondary pollution of materials; however, the slow-release problem of nano-zero-valent iron has not been solved, and due to the limitation of the degree of polymerization of natural polymer substances, the application field of this nanocomposite material is relatively single

Method used

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  • Preparation method for slow-release-type nanometer zero-valent iron particles

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Embodiment 1

[0022] A method for preparing slow-release nano-sized zero-valent iron particles. The material uses nano-sized zero-valent iron particles as the core and covers PASP on the surface. The specific preparation steps are as follows: add PASP particles with a molecular weight of 20,000 to deionized water , heated to make it fully dissolved, added deionized water to constant volume, and obtained a PASP solution with a mass fraction of 0.1%; weighed 0.5g of FeSO 4 ·7H 2 O is added in the described PASP solution of 50mL, mechanical stirring makes it fully mix, pass into nitrogen during the mixing process, remove the dissolved oxygen in the solution, obtain the mixed solution of ferrous sulfate / PASP; Weigh 0.4g of NaBH 4 Powder, added to the mixed solution of ferrous sulfate / PASP, 2mL of NaOH solution with a concentration of 0.5mol / L was added dropwise, mechanically stirred to make it fully mixed and reacted for 30min to obtain a nanometer zero-valent iron solution; the nanometer The ...

Embodiment 2

[0024] Cr 6+ The removal rate experiment. Get 0.5g of the nano zero-valent iron prepared by this patent and add it to 100mL of Cr 6+ In the simulated weakly acidic heavy metal polluted wastewater with a concentration of 100mg / L, put it in a constant temperature shaking box at 25°C for reaction, and use an ion electrode to measure Cr in the water at regular intervals. 6+ Concentration, to get the Cr of the material 6+ Remove curves.

Embodiment 3

[0026] The nano zero-valent iron particles prepared by the present invention are subjected to the removal rate experiment of chlorobenzenes. Take 0.05g of the nanometer zero-valent iron prepared by this patent and add it to 150mL of simulated weakly acidic chlorobenzene polluted wastewater with a hexachlorobenzene concentration of 200 μg / L, and put it into a constant temperature oscillation box at 25°C for reaction. Samples are taken at regular intervals, the sample is extracted with n-hexane, and the concentration of hexachlorobenzene in the sample is measured by gas chromatography to obtain the hexachlorobenzene removal curve of the material.

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Abstract

The invention discloses a preparation method for green slow-release-type nanometer zero-valent iron particles. The nanometer zero-valent iron particles serve as the core of a material, and the surface of the nanometer zero-valent iron particles is wrapped with polyaspartic acid (PASP). A reduction method is adopted, in a PASP aqueous solution, KBH4 or NaBH4 or other reducing agents are used for reducing Fe2+ to obtain Fe0. The preparation method is simple and free of secondary pollution. The obtained nanometer zero-valent iron particles have better dispersity and reactivity, and are higher than common iron powder by more than 174% and 148% respectively on the aspect of the effects of removing Cr6+ and hexachlorobenzene. The nanometer zero-valent iron particles have good stability in air, can be stored for a longer time, have good slow-release performance and can effectively control pollutants for a long time. Compared with common nanometer zero-valent iron, the action duration time can be improved by more than 40%, and the slow-release-type nanometer zero-valent iron particles have good market potentials.

Description

technical field [0001] This patent relates to nanomaterial preparation technology, especially a preparation method of slow-release nanometer zero-valent iron particles. Background technique [0002] Zero-valent iron is a material widely used in the treatment of polluted groundwater and soil. Due to its strong electronegativity and reducibility, it can react with a variety of pollutants, such as chlorobenzenes and heavy metals. So as to achieve the purpose of removing pollutants. Due to the unique nanoparticle structure of nano-zero-valent iron, it has the characteristics of large specific surface area and strong activity. It has a faster reaction rate in the process of interacting with the above pollutants, and the treatment effect is far better than that of ordinary zero-valent iron. Powder has a good market prospect. [0003] At present, the preparation methods of nano-zero-valent iron mainly include gas-phase method, liquid-phase method and solid-phase method. The nano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B82Y30/00B82Y40/00
Inventor 林爱军焦春磊曹辉邹德勋张建军张旭红宋成军
Owner 深圳碳星水务科技有限公司
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