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Preparation method and application of nano zero-valence iron and copper double-metal particles

A nano-zero-valent iron and bimetallic technology, which is applied in the direction of nano-technology and the restoration of polluted soil, can solve the problems of easy aggregation and reduction of nano-zero-valent iron particles, and the easy oxidation reaction rate of the particle surface, so as to achieve easy promotion, Huge application value, low cost effect

Active Publication Date: 2015-12-30
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the special structure of the existing nano-zero-valent iron makes the nano-zero-valent iron particles easy to agglomerate and the surface of the particles is easy to oxidize during the application process to reduce the reaction rate, and proposes a ferric ion and divalent copper ion Simultaneously adding to ethanol solution and adding reducing agent to prepare nano-zero-valent iron-copper bimetallic particles, and the use of nano-zero-valent iron-copper bimetallic particles in remediation of chromium-contaminated soil

Method used

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  • Preparation method and application of nano zero-valence iron and copper double-metal particles

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Embodiment 1

[0027] The preparation method of nano zero-valent iron-copper bimetallic particles of this embodiment includes the following steps: adding 3 mmol iron sulfate and 1 mmol copper sulfate into a three-necked flask, then adding 50 mL of 90% ethanol solution, stirring in a 60°C water bath for 10 minutes, and then adding 24 mL of 1 mol / L sodium borohydride solution into a three-necked flask, after stirring for 25 minutes, suction filtration to obtain a precipitate, the above steps are all carried out under a nitrogen atmosphere. The obtained precipitate was washed with absolute ethanol and acetone, and then drained, and dried in a vacuum drying cabinet at 60° C. for 12 hours to obtain nano zero-valent iron and copper bimetallic particles.

Embodiment 2

[0029] The preparation method of nano zero-valent iron-copper bimetallic particles of this embodiment includes the following steps: adding 7.2mmol ferric chloride and 0.9mmol copper chloride into a three-necked flask, then adding 60mL of 80% ethanol solution, and stirring in a water bath at 25°C for 30 minutes , And then add 36mL 1.2mol / L potassium borohydride solution to the three-necked flask, stir for 20min, suction filtration to obtain the precipitate, the above operation steps are carried out under a nitrogen atmosphere. The obtained precipitate was washed with absolute ethanol and acetone, and then drained, and dried in a vacuum drying cabinet at 70° C. for 18 hours to obtain nano zero-valent iron and copper bimetallic particles.

Embodiment 3

[0031] The preparation method of nano zero-valent iron-copper bimetallic particles in this embodiment includes the following steps: adding 2mmol ferric nitrate, 0.2mmol copper sulfate, and 0.2mmol copper chloride into a three-necked flask, and then adding 70mL 70% ethanol solution at 20°C Stir in a water bath for 25 minutes; then add 1 mL of 2mol / L sodium borohydride solution to the three-necked flask, stir for 40 minutes, and then filter to obtain a precipitate. The above steps are performed under a nitrogen atmosphere. The obtained precipitate was washed with absolute ethanol and acetone, and then drained, and dried in a vacuum drying cabinet at 40° C. for 16 hours to obtain nano zero-valent iron and copper bimetallic particles.

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Abstract

The invention relates to a preparation method and application of nano zero-valence iron and copper double-metal particles. In one embodiment, the preparation method comprises the following steps: adding an iron salt and a copper salt into a three-opening flask at a mol ratio of (3-10) to 1; taking 50mL-100mL of an ethanol solution to be added into the three-opening flask; stirring in a water bath at 20 DEG C to 60 DEG C for 10 minutes to 30 minutes; adding a hydroborate solution into the three-opening flask; after stirring for 10 minutes to 40 minutes, filtering to obtain sediment; washing the sediment with absolute ethyl alcohol and acetone respectively and then filtering; and putting the sediment into a vacuum drying box to be dried for 1 hour to 24 hours at 25 DEG C to 80 DEG C to obtain the nano zero-valence iron and copper double-metal particles. According to the embodiment provided by the invention, a preparation process is simple and the utilization is safe; and by adjusting the pH of chromium polluted soil, the application amount of the nano zero-valence iron and copper double-metal particles and a reaction temperature, hexavalent chromium in the chromium polluted soil can be rapidly reduced, so that the embodiment has a great application value in the field of repairing the chromium polluted soil.

Description

Technical field [0001] The invention relates to the technical field of metal nano particles, in particular to a preparation method and application of nano zero-valent iron and copper bimetallic particles. Background technique [0002] With the rapid development of industry, agriculture, and urbanization, environmental pollution has become more and more serious, among which the problem of heavy metal pollution in soil is very prominent. my country is a major producer of chromium salts in the world. A large amount of chromium slag will be produced in the process of chromium salt production. The hexavalent chromium in the chromium slag has carcinogenic effects on the human body. It has strong toxicity and is easily absorbed by the human body. Accumulate. my country discharges about 600,000 tons of chromium slag every year, and more than 12.5 million tons of soil is seriously polluted by hexavalent chromium in my country. The chromium slag is washed by rainwater and seeps into the so...

Claims

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Application Information

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IPC IPC(8): B22F9/24B09C1/08B82Y40/00
Inventor 祝方李璐玮马少云商执峰
Owner TAIYUAN UNIV OF TECH
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