An iron-copper bimetallic loaded ferrous sulfide composite material, its preparation method and application

A composite material, ferrous sulfide technology, applied in the field of environmental remediation, can solve the problems of low utilization rate of zero-valent iron, too fast formation of passivation layer, and reduced selectivity of zero-valent iron reaction

Active Publication Date: 2021-04-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN108249524A discloses a zero-valent iron-iron-copper micro-electrolytic filler and a preparation method thereof. The preparation method mainly includes: (1) plating a layer of dense copper on the surface of zero-valent iron to prepare an iron-copper bimetal; (2) cleaning and Drying; (3) mixing to obtain fillers; the material in this patent uses iron-copper micro-electrolysis to improve the activity of zero-valent iron and increase the utilization efficiency of zero-valent iron, but the material also has a passivation layer formed too fast, zero-valent iron The reaction selectivity of iron decreases
Although the iron-ferrous sulfide complex prepared in this invention improves the electron selectivity of zero-valent iron, the utilization rate of zero-valent iron is relatively low

Method used

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  • An iron-copper bimetallic loaded ferrous sulfide composite material, its preparation method and application
  • An iron-copper bimetallic loaded ferrous sulfide composite material, its preparation method and application
  • An iron-copper bimetallic loaded ferrous sulfide composite material, its preparation method and application

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Embodiment 1

[0068] This embodiment provides a method for preparing an iron-copper bimetallic loaded ferrous sulfide composite material, the method comprising the following steps:

[0069](1) Prepare 200 mL of acetic acid-sodium acetate buffer solution with pH=6, and add 0.4 mmol of copper chloride, and mix well;

[0070] (2) Use nitrogen purging to remove the dissolved oxygen of the solution in step (1), and use a film seal;

[0071] (3) Add 1 g of micron-sized iron powder with a size of 400 mesh and a purity of 98% to the solution described in step (2), and fully undergo a displacement reaction in a water-bath shaker at a temperature of 25° C. and a rotation speed of 200 rpm for 30 minutes;

[0072] (4) Add the Na of 0.5mol / L of 2mL in the solution after the reaction described in step (3) 2 S solution, after fully reacting for 8 hours, vacuum filter with a 0.22 μm water filter membrane to obtain a filter residue, and finally vacuum freeze-dry to obtain an iron-copper bimetallic loaded f...

Embodiment 2

[0076] This embodiment provides a method for preparing an iron-copper bimetallic loaded ferrous sulfide composite material, the method comprising the following steps:

[0077] (1) Prepare 200 mL of acetic acid-sodium acetate buffer solution with pH=6, and add 0.8 mmol of copper chloride, and mix well;

[0078] (2) Use nitrogen purging to remove the dissolved oxygen of the solution in step (1), and use a film seal;

[0079] (3) Add 1 g of micron-sized iron powder with a size of 400 mesh and a purity of 98% to the solution described in step (2), and fully undergo a displacement reaction in a water-bath shaker at a temperature of 25° C. and a rotation speed of 200 rpm for 30 minutes;

[0080] (4) Add the Na of 0.5mol / L of 2mL in the solution after the reaction described in step (3) 2 S solution, after fully reacting for 6 hours, vacuum filter with a 0.22 μm water filter membrane to obtain a filter residue, and finally vacuum freeze-dry to obtain an iron-copper bimetallic loaded ...

Embodiment 3

[0085] This embodiment provides a method for preparing an iron-copper bimetallic loaded ferrous sulfide composite material, the method comprising the following steps:

[0086] (1) Prepare 200 mL of acetic acid-sodium acetate buffer solution with pH=6, and add 1.2 mmol of copper chloride, and mix well;

[0087] (2) Use nitrogen purging to remove the dissolved oxygen of the solution in step (1), and use a film seal;

[0088] (3) Add 1 g of micron-sized iron powder with a size of 400 mesh and a purity of 98% to the solution described in step (2), and fully undergo a displacement reaction in a water-bath shaker at a temperature of 25° C. and a rotation speed of 200 rpm for 30 minutes;

[0089] (4) Add the Na of 0.5mol / L of 2mL in the solution after the reaction described in step (3) 2 S solution, after fully reacting for 6 hours, vacuum filter with a 0.22 μm water filter membrane to obtain a filter residue, and finally vacuum freeze-dry to obtain an iron-copper bimetallic loaded ...

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Abstract

The invention relates to an iron-copper bimetallic loaded ferrous sulfide composite material, its preparation method and application. The composite material includes iron-copper bimetal and ferrous sulfide loaded on the surface of the iron-copper bimetal, and copper in the iron-copper bimetal is loaded on the iron surface. The composite material has high activity and reaction selectivity, and can be used in the fields of chromium-containing sewage treatment, chromium-contaminated groundwater restoration and the like. The preparation method comprises: mixing copper salt solution and iron powder once, and then mixing with alkali metal sulfide solution twice to obtain the iron-copper bimetallic loaded ferrous sulfide composite material. The preparation method reclaims the Fe produced in the copper ion and iron powder replacement process 2+ , which has the advantages of simple steps, cost-effectiveness.

Description

technical field [0001] The invention relates to the technical field of environmental restoration, in particular to an iron-copper bimetallic loaded ferrous sulfide composite material, its preparation method and application. Background technique [0002] The pollution of the water environment is one of the main environmental problems. As an environmentally friendly material that does not produce secondary pollutants and has a removal effect on various pollutants, more and more researchers will Zero-valent iron is used in water treatment, but the main problem is that the surface of zero-valent iron is easily passivated, thereby reducing the reactivity. In order to increase the activity of zero-valent iron, researchers have proposed many countermeasures, such as pickling zero-valent iron, nano-zero-valent iron, bimetallic and so on. [0003] CN108249524A discloses a zero-valent iron-iron-copper micro-electrolytic filler and a preparation method thereof. The preparation method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24C02F1/00C02F101/22
CPCB22F1/0003B22F9/24B22F2009/245C02F1/00C02F2101/22
Inventor 屈敏陈辉霞王兴润黄涛李书鹏徐红彬
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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