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Graphene-loaded nano zero-valent copper/iron bimetallic composite material based on nano primary battery effect and preparation method and application thereof

A nano-zero-valent iron and nano-zero-valent technology, applied in the field of water treatment, can solve the problems of poor removal stability and easy desorption of heavy metals, and achieve the effects of improving reduction and removal efficiency, increasing electromotive force, and improving oxidation resistance

Active Publication Date: 2021-11-05
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By establishing a complete nanoscale primary battery circuit in the heavy metal adsorption process, a new method for the reduction and removal of heavy metals based on the rapid redox reaction characteristics of nanoscale primary batteries is developed, and the heavy metal ions are quickly reduced to simple substances and deposited on the positive electrode of the primary battery. It is expected to completely solve the problem of heavy metals. Poor stability and easy desorption of heavy metals in the removal of pollutants, to achieve efficient and rapid reduction removal has great social, economic and environmental significance

Method used

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  • Graphene-loaded nano zero-valent copper/iron bimetallic composite material based on nano primary battery effect and preparation method and application thereof
  • Graphene-loaded nano zero-valent copper/iron bimetallic composite material based on nano primary battery effect and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of Cu / Fe / rGO composite material, comprising the following steps:

[0029] Step 1. Ultrasonically disperse 1.0g of graphene oxide into 100mL of water, add 7.58g of ferrous sulfate solution and 25mL of hydrazine hydrate under the condition of stirring at 500rpm, and put it in an autoclave for a reduction reaction at 120°C for 24h;

[0030] Step 2, the cooled product is filtered and washed, and vacuum-dried at 60° C. to obtain the Fe / rGO nanocomposite;

[0031] Step 3. Redisperse Fe / rGO into 100mL of water, add 7.98g of copper sulfate, and put it in an autoclave at 120°C for 24 hours of displacement reaction;

[0032] Step 4: Suction filter and wash the cooled product, and vacuum-dry at 60° C. to obtain a Cu / Fe / rGO composite material.

[0033] The morphology of the Cu / Fe / rGO composite synthesized in Example 1 was characterized by scanning electron microscopy, as shown in Figure 1, it can be seen that nano-sized zero-valent copper-iron bimetals were su...

Embodiment 2

[0035] A method for preparing a Cu / Fe / rGO composite material, comprising the following steps:

[0036] Step 1. Ultrasonic disperse 1.0g of graphene oxide into 100mL of water, add 9.00g of ferrous nitrate solution and 25mL of hydrazine hydrate under the condition of stirring at 500rpm, and put it in an autoclave for a reduction reaction at 120°C for 24h;

[0037] Step 2, the cooled product is filtered and washed, and vacuum-dried at 60° C. to obtain the Fe / rGO nanocomposite;

[0038] Step 3. Redisperse Fe / rGO into 100mL of water, add 9.38g of copper nitrate, and put it into an autoclave at 120°C for 24 hours of displacement reaction;

[0039] For the Cu / Fe / rGO composite material synthesized in Example 2, the test results show that the Cu / Fe / rGO composite material can remove the highly toxic heavy metal ions (lead, lead, Cadmium and mercury) are reduced to a low-toxic or non-toxic single substance state and deposited on the surface of the positive electrode material, and the re...

Embodiment 3

[0041] A method for preparing a Cu / Fe / rGO composite material, comprising the following steps:

[0042]Step 1. Ultrasonically disperse 1.0g of graphene oxide into 100mL of water, add 6.34g of ferrous chloride solution and 25mL of hydrazine hydrate under the condition of stirring at 500rpm, and put it in an autoclave for a reduction reaction at 120°C for 24h;

[0043] Step 2, the cooled product is filtered and washed, and vacuum-dried at 60° C. to obtain the Fe / rGO nanocomposite;

[0044] Step 3. Redisperse Fe / rGO into 100mL of water, add 6.72g of copper chloride, and put it in an autoclave at 120°C for 24 hours of displacement reaction;

[0045] For the Cu / Fe / rGO composite material synthesized in Example 3, the test results show that the Cu / Fe / rGO composite material can remove the highly toxic heavy metal ions (lead, lead, Cadmium and mercury) are reduced to a low-toxic or non-toxic single substance state and deposited on the surface of the positive electrode material, and the...

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Abstract

The invention discloses a graphene-loaded nano zero-valent copper / iron bimetal (Cu / Fe / rGO) composite material based on a nano primary battery effect and a preparation method and application thereof. The Cu / Fe / rGO composite material is prepared through the following steps of: firstly, mixing graphene oxide, ferrous salt and hydrazine hydrate and carrying out a reduction reaction to obtain a graphene-loaded nanoscale zero-valent iron composite material; and mixing the graphene-loaded nano zero-valent iron with copper salt, and carrying out a replacement reaction to obtain a final product. The synthesis process is simple. The prepared Cu / Fe / rGO composite material can spontaneously construct a complete nanoscale primary battery (the electromotive force is about 0.789 V) in the heavy metal adsorption treatment process, so that the directional transmission rate of electrons is greatly increased, the reduction adsorption removal efficiency of heavy metal ions is improved, and efficient and rapid reduction removal of heavy metals based on the rapid oxidation-reduction reaction characteristic of the nano primary battery is realized.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a graphene-loaded nano-zero-valent copper / iron bimetallic composite material based on the nano-galvanic effect and its preparation method and application. Background technique [0002] Heavy metal pollution in the water environment has the characteristics of long-term, cumulative, latent, etc., which will seriously endanger the ecological environment and human life and health. The development of new materials and new principles for efficient removal of highly toxic heavy metals has become an urgent challenge in the field of water treatment technology. [0003] Traditional heavy metal ion removal technologies include coagulation precipitation method, adsorption method, membrane separation method, ion exchange method, electrochemical method, etc. The removal of heavy metal ions in water environment by such technologies is mainly through precipitation, ion exchange, surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/70C02F1/72C02F101/20
CPCC02F1/46176C02F1/46109C02F1/467C02F2101/20C02F2001/46133
Inventor 何军勇孔令涛刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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