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Ball-milled zero-valent iron biochar composite material and preparation method and application thereof

A composite material and biochar technology, applied in the field of water treatment, can solve the problems of chemical pollution, complex, expensive conditions and equipment, etc., and achieve the effect of avoiding pollution, simple preparation method and good stability

Inactive Publication Date: 2020-12-01
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires complex and expensive conditions and equipment, and is somewhat limited to laboratory-scale studies
All of the above methods inevitably lead to chemical contamination and are limited to laboratory applications

Method used

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  • Ball-milled zero-valent iron biochar composite material and preparation method and application thereof
  • Ball-milled zero-valent iron biochar composite material and preparation method and application thereof
  • Ball-milled zero-valent iron biochar composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0046] A method for preparing a ball-milled zero-valent iron biochar composite material, comprising the following steps:

[0047] 1) Pretreatment of corn stalks

[0048] Wash the corn stalks (purchased in Dezhou, Shandong) until the water is clear, dry them in an oven at 80°C for 24 hours, pulverize them with a grinder, and pass through a 100-mesh sieve to obtain the crushed corn stalks, which are stored in a dry and dark place for later use;

[0049] 2) Preparation and treatment of corn straw biochar

[0050]Put the crushed corn stalks into an oven and dry at 80°C for 12 hours, cover the crushed corn stalks with aluminum foil, place them in a crucible (ceramic), cover the crucible with tin foil, and place it in a muffle Crack in a furnace for 2 hours at a temperature of N°C. After cracking, wash repeatedly with distilled water until the pH is neutral, and then dry at 80°C for 12 hours to obtain biochar for later use; see Table 1 for the N value.

[0051] 3) Preparation of b...

Embodiment 3

[0055] The specific surface area of ​​the obtained ball-milled zero-valent iron biochar composite material prepared in Example 3 is 29.71m 2 / g, the pore volume is 0.01415cm 3 / g.

Embodiment 4～6

[0056] Embodiment 4~6 (contrast)

[0057] The preparation method of ball milling biochar comprises the following steps:

[0058] 1) Pretreatment of corn stalks

[0059] Wash the corn stalks (purchased in Dezhou, Shandong) until the water is clear, dry them in an oven at 80°C for 24 hours, pulverize them with a grinder, and pass through a 100-mesh sieve to obtain the crushed corn stalks, which are stored in a dry and dark place for later use;

[0060] 2) Preparation and treatment of corn straw biochar

[0061] Put the crushed corn stalks into an oven and dry at 80°C for 12 hours, cover the crushed corn stalks with aluminum foil, place them in a crucible (ceramic), cover the crucible with tin foil, and place it in a muffle Crack in a furnace for 2 hours at a temperature of N°C. After cracking, wash repeatedly with distilled water until the pH is neutral, and then dry at 80°C for 12 hours to obtain biochar for later use; see Table 2 for the N value.

[0062] 3) Preparation of ...

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Abstract

The invention discloses a ball-milled zero-valent iron biochar composite material and a preparation method and application thereof. The preparation method comprises the following steps: washing corn straw until water is clear, drying, smashing and sieving, and obtaining the smashed corn straw; drying the crushed corn straw at 60-80 DEG C for 12-24 hours, carrying out oxygen-limited cracking at 300-700 DEG C for 2-4 hours, repeatedly washing with distilled water until the pH value is neutral, and drying at 60-80 DEG C for 12-24 hours to obtain biochar; and mixing the biochar with iron powder, and carrying out ball milling for 6-48 hours in a nitrogen or inert gas environment to obtain the ball-milled zero-valent iron biochar composite material. The ball-milled zero-valent iron biochar composite material prepared by the method has the advantages of high adsorption efficiency, better stability, simple preparation conditions, no pollution, magnetism, reusability and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a ball-milled zero-valent iron biochar composite material and a preparation method and application thereof. Background technique [0002] Hexavalent chromium and trivalent chromium are stable in the natural environment. The toxicity of hexavalent chromium is much higher than that of trivalent chromium. 4 2- , HCrO 4 - and Cr 2 o 7 2- ) exists, has high biological toxicity, can cause acute poisoning, and also includes carcinogenic and mutagenic effects. Chromium pollution often appears in the wastewater discharged by these industries, and it is easy to cause serious pollution to air and soil. Since the 1950s, with the massive development of chromium salt enterprises in my country, a large amount of chromium slag was discharged during the production process. Until the 1980s, the international community generally realized the hazards of chromium, and the c...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01J20/28C10B53/02C10B57/10C02F1/28C02F101/22
CPCB01J20/02B01J20/20B01J20/28009C02F1/281C02F1/283C02F2101/22C10B53/02C10B57/10Y02E50/10
Inventor 唐景春王昆
Owner NANKAI UNIV
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