Method for preparing nanoscale zero-valent iron and nanoscale duplex metal Cu/Fe

A nano-scale, zero-valent iron technology, applied in nanotechnology and other directions, can solve the problems of easy agglomeration and uneven particle distribution, and achieve the effects of rapid reaction, uniform particle size distribution and simple preparation method.

Active Publication Date: 2015-01-28
浙江聚盾科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems of uneven particle distribution and easy agglomeration in the process of preparing nano-scale zero-valent iron particles and nano-scale bimetallic particles by ordinary liquid-phase reduction method, the purpose of the present invention is to provide an improved liquid-phase reduction method for preparing nano-scale zero-valent iron particles. The method of valence iron and nano-scale bimetal, using the cavitation of ultrasonic waves to promote its full dispersion and reduce agglomeration, prepares ultra-fine particles NZVI with smaller particle size, larger specific surface area and higher reactivity

Method used

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  • Method for preparing nanoscale zero-valent iron and nanoscale duplex metal Cu/Fe
  • Method for preparing nanoscale zero-valent iron and nanoscale duplex metal Cu/Fe
  • Method for preparing nanoscale zero-valent iron and nanoscale duplex metal Cu/Fe

Examples

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Embodiment 1

[0042] Under the action of ultrasonic (40KHz, 150W) and continuous stirring under nitrogen, the temperature of the water bath is 30°C, and the concentration of 200mL is 0.50mol L -1 NaBH 4 The aqueous solution was added dropwise within 25min to a container containing 200mL 0.25mol·L -1 FeSO 4 ·7H 2 In a 500mL three-necked flask of O aqueous solution, continue to react for 10 minutes after the dropwise addition, and then nano-sized zero-valent iron particles can be prepared. The prepared nano-sized zero-valent Wash thoroughly with ionic water for 4 times, then fully wash with 200mL absolute ethanol for 4 times, and then store in absolute ethanol.

[0043] XRD spectrum as figure 1 shown. The XRD test results show that: when the scanning diffraction angle (2θ) is 30-100°, the corresponding 2θ when the diffraction peaks appear are 44-46°, 64-66°, 81-83°, corresponding to the standard PDF card of iron It was found that the corresponding 110-plane diffraction (44.6732°), 200-p...

Embodiment 2

[0047] Under the action of ultrasonic (40KHz, 100W) and continuous stirring under nitrogen, the temperature of the water bath is 30°C, and the concentration of 200mL is 0.50mol L -1 NaBH 4 The aqueous solution was added dropwise within 25min to a container with an equal volume of 0.25mol·L -1 FeSO 4 ·7H 2 In a 500mL three-neck flask of O aqueous solution, continue to react for 10 minutes after the dropwise addition, and then nano-scale zero-valent iron particles can be prepared. Fully washed, then fully washed with absolute ethanol, and stored in absolute ethanol.

[0048] The XRD test results show that: when the scanning diffraction angle (2θ) is 30-100°, the corresponding 2θ when the diffraction peaks appear are 44-46°, 64-66°, 81-83°, corresponding to the standard PDF card of iron It was found that the corresponding 110-plane diffraction (44.6732°), 200-plane diffraction (65.0211°) and 211-plane diffraction (82.3326°) corresponded exactly, indicating that the particles ...

Embodiment 3

[0052] Under the action of ultrasonic (20KHz, 150W) and continuous stirring nitrogen, the temperature of the water bath is 30 ℃, and the concentration of 200mL is 0.50mol L -1 NaBH 4 The aqueous solution was added dropwise within 25min to a container with an equal volume of 0.25mol·L -1 FeSO 4 ·7H 2 In a 500mL three-neck flask of O aqueous solution, continue to react for 10 minutes after the dropwise addition, and then nano-scale zero-valent iron particles can be prepared. Fully washed, then fully washed with absolute ethanol, and stored in absolute ethanol.

[0053] The XRD test results show that: when the scanning diffraction angle (2θ) is 30-100°, the corresponding 2θ when the diffraction peaks appear are 44-46°, 64-66°, 81-83°, corresponding to the standard PDF card of iron It was found that the corresponding 110-plane diffraction (44.6732°), 200-plane diffraction (65.0211°) and 211-plane diffraction (82.3326°) corresponded exactly, indicating that the particles were e...

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Abstract

The invention discloses a method for preparing nanoscale zero-valent iron and nanoscale Cu/Fe particles. The method comprises the steps of dropwise adding KBH4 or NaBH4 aqueous solution into soluble ferrite aqueous solution under the condition of adopting ultrasonication and continuously stirring with nitrogen introduction, wherein the amount of substance ratio between KBH4 or NaBH4 and soluble ferrite substances is 2-4:1; continuously stirring after dripping, completely reacting to acquire nanoscale zero-valent iron particles; separating, washing and storing; adding CuSO4 or CuCl2 aqueous solution into the nanoscale zero-valent iron particles, wherein the amount of substance ratio between CuSO4 or CuCl2 and the soluble ferrite substances is 1:11-19; stirring and reacting to prepare nanoscale Cu/Fe particles. The high-dispersing type nanoscale zero-valent iron and nanoscale duplex metal Cu/Fe prepared by the method can be used for simultaneously repairing chlorinated organic compounds, nitrate and heavy metal polluted water. The preparation method is simple, and rapid in speed; through the cavatition effect of ultrasonic wave, the dispersion is completely accelerated, and the agglomeration is reduced; the high-dispersing type nanoscale zero-valent iron and nanoscale duplex metal Cu/Fe with smaller grain size, larger specific surface area and higher reactivity can be prepared.

Description

(1) Technical field: [0001] The invention relates to a method for preparing nanoscale zero-valent iron and nanoscale bimetallic Cu / Fe. (two) background technology: [0002] Zero valent iron (Fe 0 , ZVI) research and application in the field of groundwater pollutant remediation began in the 1990s. At first, the granular ZVI was applied to the osmotic reaction grid (PRB). When the polluted groundwater passes through the PRB reaction grid, the pollutants Precipitation, adsorption and transformation on ZVI surface. From the early 1990s to the present, PRB technology has been widely used in actual groundwater remediation projects in the United States, and it has been proved that this technology is a relatively effective in-situ remediation technology, which is gradually replacing the traditional pumping treatment technology. Research hotspots of contaminated groundwater remediation (Puls R W, Paul C J, Powell R M. The application of in situ permeable reactive (zero-valent iron)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 赵德明张佩
Owner 浙江聚盾科技有限公司
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