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Nanometer zero-valent iron-biochar composite material, and preparation method and application thereof

A technology of nano-zero-valent iron and composite materials, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problem of reducing specific surface area and reactivity, prone to agglomeration, performance degradation, etc. problems, to achieve excellent adsorption, stable properties, and low prices

Active Publication Date: 2018-11-30
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved: Aiming at the problem that nanometer zero-valent iron is easily oxidized in the air to form a passivation layer to reduce its activity, and it is easy to agglomerate itself, greatly reducing its specific surface area and reactivity, resulting in a decrease in its performance. Provide a nano-zero-valent iron-biochar composite material and its preparation method and application, which can reduce the agglomeration of nano-zero-valent iron and improve the ability of nano-zero-valent iron to remove pollutants

Method used

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  • Nanometer zero-valent iron-biochar composite material, and preparation method and application thereof

Examples

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Embodiment 1

[0016] Preparation and application of a nano-zero-valent iron-biochar composite material. Using rice straw as biomass and biochar (BC100) produced by pyrolysis at a cracking temperature of 100°C as the carrier, the nano-zero-valent iron-biochar composite was prepared by liquid reduction method material, and used for the removal of Cr(Ⅵ), its preparation process and removal process include the following steps:

[0017] First prepare the rice straw biochar sample (BC100), weigh 50g of the biomass powder passed through a 0.154 mm sieve into a 250mL crucible, cover it after compaction, place it in a muffle furnace at 100°C for 6 hours, and cool to Take it out after room temperature, grind it through a 0.154 mm sieve with a mortar, and put it in a brown bottle. The prepared biochar is recorded as: BC100.

[0018] 2.0g FeSO 4 . 7H 2 O and 400 mg BC100 were dissolved in 100 mL of aqueous solution, adjusted to pH 4.5, and placed in a shaker at 25°C for 1 h. Then add 100mL of abso...

Embodiment 2

[0021] Preparation and application of a nano-zero-valent iron-biochar composite material. Using rice straw as biomass and biochar (BC300) produced by pyrolysis at 300°C as the carrier, the nano-zero-valent iron-biochar composite was prepared by liquid reduction method material, and used for the removal of Cr(Ⅵ), its preparation process and removal process include the following steps:

[0022] First prepare the rice straw biochar sample (BC300), weigh 50g of the biomass powder passed through a 0.154mm sieve into a 250mL crucible, cover it after compaction, place it in a muffle furnace at 300°C for 6 hours, and cool to Take it out after room temperature, grind it through a 0.154 mm sieve with a mortar, and put it in a brown bottle. The prepared biochar is recorded as: BC300.

[0023] 1.0g FeSO 4 . 7H 2 O and 200 mg BC300 were dissolved in 50 mL of aqueous solution, adjusted to pH 4.5, and placed in a shaker at 25°C for 1 h. Then add 50mL of absolute ethanol, transfer the wh...

Embodiment 3

[0026] Preparation and application of a nano-zero-valent iron-biochar composite material. Using rice straw as biomass and biochar (BC400) produced by pyrolysis at 400°C as the carrier, the nano-zero-valent iron-biochar composite was prepared by liquid reduction method material, and used for the removal of Cr(Ⅵ), its preparation process and removal process include the following steps:

[0027] First prepare the rice straw biochar sample (BC400), weigh 50g of the biomass powder passed through a 0.154 mm sieve into a 250mL crucible, compact it, cover it, place it in a muffle furnace at 400°C for 6 hours, and cool it to Take it out after room temperature, grind it through a 0.154 mm sieve with a mortar, and put it in a brown bottle. The prepared biochar is recorded as: BC400.

[0028] 1.0g FeSO 4 . 7H 2 O and 50 mg BC400 were dissolved in 50 mL of aqueous solution, adjusted to pH 4.0, and placed in a shaker at 25°C for 1 h. Then add 50 mL of absolute ethanol, transfer the who...

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Abstract

The invention provides a nanometer zero-valent iron-biochar composite material, and a preparation method and application thereof. According to the invention, a carrier is a series of biochar with different cracking temperatures; the biochar is cheap and easily-available, has large specific surface area and contains a plurality of mineral components; nanometer zero-valent iron particles carried bythe carrier have strong activity; thus, the nanometer zero-valent iron particles have high activity; and the nanometer zero-valent iron-biochar composite material prepared from the carrier has high activity, and has the advantages of stable properties and low price at the same time. Screening of the series of different cracking temperatures shows that the composite material formed by the biochar generated by cracking of straw at medium and high temperatures and the nanometer zero-valent iron has strong removal effect on heavy metals. Meanwhile, the nanometer zero-valent iron-biochar compositematerial provided by the invention has excellent adsorption performance of the biochar and strong reduction capacity of the nanometer iron, and can provide theoretical basis and technical support forprevention, control and remediation of heavy metal pollution to groundwater.

Description

technical field [0001] The invention relates to the field of groundwater pollution restoration, in particular to a nano-zero-valent iron-biochar composite material used for removing heavy metal hexavalent chromium from groundwater, a preparation method and application thereof. Background technique [0002] Due to its large specific surface area and surface energy, nano-zero-valent iron can cause special surface effects and quantum effects, and has been widely used as an efficient reductive remediation material in the remediation of contaminated groundwater. However, nano-zero-valent iron is easily oxidized in the air to form a passivation layer to reduce activity, and it is easy to agglomerate itself, which greatly reduces its specific surface area and reactivity, resulting in reduced reduction ability, which greatly limits the ability of nano-zero-valent iron to form a passivation layer. Application of iron in groundwater pollution remediation. Therefore, in the applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/70C02F101/20C02F103/06
CPCC02F1/283C02F1/705C02F2101/20C02F2103/06
Inventor 钱林波陈梦舫晏井春张文影
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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