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Ferric-carbon biologic particle and preparation method and application thereof

A biological particle, iron-carbon technology, applied in chemical instruments and methods, other chemical processes, restoration of polluted soil, etc. Problems such as poor soil remediation effect, to achieve the effect of good soil remediation effect, rich surface functional groups and low cost

Inactive Publication Date: 2017-01-04
广州市金龙峰环保设备工程股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional biochar preparation technology is relatively rough, the types and properties of surface groups are limited, and it is difficult to disperse. It cannot effectively stabilize the nano-zero-valent iron, the utilization rate is also low, and the effect on soil restoration is not good. The loading process of zero-valent iron on biochar has high energy consumption and high cost

Method used

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Examples

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preparation example Construction

[0029] A preparation method of iron charcoal biological particles, comprising the following steps:

[0030] 1) Drying, pulverizing, pyrolyzing, grinding, sieving, and washing agricultural and forestry wastes to obtain biochar;

[0031] 2) Fully soak the biochar with NaOH solution, then filter, wash and dry;

[0032] 3) Add the biochar treated in step 2) to polyethyleneimine / ethanol solution, fully react, then add glutaric acid solution, fully react, then filter and dry to obtain carbon bioparticles with amino groups grafted on the surface ;

[0033] 4) Disperse the soluble iron salt solution or ferrous salt solution into absolute ethanol, add charcoal biological particles, stir evenly, add NaBH 4 The solution is fully reacted, then aged, filtered, washed, and dried to obtain carbon bioparticles loaded with nanometer zero-valent iron, that is, iron-carbon bioparticles.

[0034] Preferably, the agricultural and forestry waste in step 1) is at least one of rice straw, rice hus...

Embodiment 1

[0053] Preparation of charcoal bioparticles:

[0054] 1) The straw was dried and pulverized, pyrolyzed at 400°C for 3 hours, ground, passed through a 60-mesh sieve, and washed three times with deionized water to obtain biochar;

[0055] 2) Add 200g of biochar to 500mL NaOH solution with a molar concentration of 3mol / L, stir and soak for 1h, filter, wash with deionized water 4 times, and fully dry at 105°C;

[0056] 3) Add the biochar treated in step 2) to 500mL polyethyleneimine / ethanol solution with a mass fraction of 5%, stir for 5h, then add 500mL glutaric acid solution with a mass fraction of 1%, and stir for 20min, Filtrate and fully dry to obtain charcoal bioparticles grafted with a large amount of amino groups on the surface.

[0057] Loading of nano-zero-valent iron on carbon bioparticles:

[0058] 1 mL of FeCl with a molar concentration of 0.1 mol / L 3 The solution was dispersed into 400mL absolute ethanol, according to Fe 3+ 1. Add charcoal bioparticles at a mass ...

Embodiment 2

[0063] Preparation of charcoal bioparticles:

[0064] 1) Dry and pulverize fallen leaves, pyrolyze at 300°C for 5 hours, grind, pass through a 60-mesh sieve, and wash with deionized water 4 times to obtain biochar;

[0065] 2) Add 200g of biochar to 500mL NaOH solution with a molar concentration of 4mol / L, stir and soak for 1h, filter, wash with deionized water 3 times, and fully dry at 105°C;

[0066] 3) Add the biochar treated in step 2) to 600 mL of polyethyleneimine / ethanol solution with a mass fraction of 3%, stir for 5 h, then add 600 mL of glutaric acid solution with a mass fraction of 1.2%, and stir for 20 min, Filtrate and fully dry to obtain charcoal bioparticles grafted with a large amount of amino groups on the surface.

[0067] Loading of nano-zero-valent iron on carbon bioparticles:

[0068] 1 mL of Fe(NO with a molar concentration of 0.3 mol / L 3 ) 2 The solution was dissolved in 300mL absolute ethanol, according to Fe 3+ 1. Add charcoal bioparticles at a ma...

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Abstract

The invention discloses a ferric-carbon biologic particle and a preparation method and application thereof. The preparation method of the ferric-carbon biologic particle comprises the following steps: 1) drying, smashing, pyrolyzing, grinding, sieving and washing forestry and agricultural residues to obtain charcoal; 2) soaking the charcoal in a NaOH solution to perform surface activation treatment; 3) sequentially utilizing a polyethyleneimine / ethanol solution and a glutaric acid solution to treat the charcoal with the surface activated to obtain a charcoal particle with amino grafted on the surface, 4) dispersing a soluble molysite solution or a ferrite solution into absolute ethyl alcohol, adding the charcoal particle and a NaBH4 solution, loading nanometer zero-valent iron generated in reaction on the charcoal particle to obtain the ferric-carbon biologic particle. The ferric-carbon biologic particle is good in dispersibility, high in load rate of the nanometer zero-valent iron, good in soil remediation effect, stable in effect, simple in preparation technology, low in energy consumption, low in cost, economical, practical and suitable for being widely used as a remediation material of soil which is polluted by heavy metal.

Description

technical field [0001] The invention relates to an iron-charcoal biological particle, a preparation method and application thereof. Background technique [0002] With the rapid development of industrialization and urbanization, soil heavy metal pollution has become a prominent environmental problem that cannot be ignored. At present, the area of ​​arable land polluted by heavy metals such as Cd, As, Pb, Hg, and Zn in my country has reached nearly 20 million hectares, accounting for about one-fifth of the total arable land area. Soil heavy metal pollution causes serious degradation of soil fertility, crop yield and quality drop significantly, seriously affects environmental quality and sustainable economic development, and threatens human health. Toxic heavy metals have the characteristics of concealment, long-term, non-degradable and irreversible in the process of soil pollution. They will not only cause soil fertility, crop yield and quality decline, but also easily cause ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B09C1/00B09C1/08
CPCB01J20/20B01J20/0225B01J2220/4887B09C1/00B09C1/08
Inventor 石云峰朱月琪陈晶晶
Owner 广州市金龙峰环保设备工程股份有限公司
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