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Iron and copper ferrous sulfide loading composite material, preparation method and application thereof

A composite material, ferrous sulfide technology, applied in the field of environmental remediation, can solve the problems of too fast formation of passivation layer, low utilization rate of zero-valent iron, low reaction selectivity of zero-valent iron, etc., so as to improve the reaction activity and improve the utilization rate efficiency, improving the reaction selectivity

Active Publication Date: 2020-06-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Iron and copper ferrous sulfide loading composite material, preparation method and application thereof
  • Iron and copper ferrous sulfide loading composite material, preparation method and application thereof
  • Iron and copper ferrous sulfide loading composite material, preparation method and application thereof

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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 and copper ferrous sulfide loading composite material, a preparation method and application thereof. The composite material comprises iron and copper and ferrous sulfide loaded to the surfaces of the iron and copper. Copper in the iron and copper is loaded to the surface of iron. The composite material is relatively high in activity and reaction selectivity, and can be used in the fields of chromium containing sewage treatment, chromium polluted underground water repair and the like. The preparation method comprises the following steps of mixing a copper salt solution with iron powder primarily; and then mixing the mixed solution with an alkali metal vulcanized salt solution secondarily to obtain the iron and copper ferrous sulfide loading composite material. The preparation method recovers Fe2<+> generated in a replacement process of copper ions and iron powder and has the advantages of being simple in step and economical and effect.

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 Applications(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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