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Preparation method and application of acid pickled ZVI (zero-valent iron) modified charcoal

A biochar and pickling technology, which is applied in the field of contaminated soil remediation, can solve the problems of affecting the reduction effect of CrCr and hindering the reduction reaction, so as to increase the surface activity site of the target product, facilitate the reduction, and increase the content of carboxyl and hydroxyl groups Effect

Active Publication Date: 2019-09-10
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome that nZVI is easy to form a passivation film on the surface of the loading matrix under the existing alkaline conditions, hindering the reduction reaction of nZVI to Cr(VI), and affecting the reduction effect of CrCr(VI) in heavy metal Cr(VI) soil remediation The problem

Method used

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  • Preparation method and application of acid pickled ZVI (zero-valent iron) modified charcoal
  • Preparation method and application of acid pickled ZVI (zero-valent iron) modified charcoal
  • Preparation method and application of acid pickled ZVI (zero-valent iron) modified charcoal

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Embodiment 1

[0031] Such as figure 1 As shown, this embodiment provides a method for preparing acid-washed ZVI modified biochar, and the specific process is as follows:

[0032] (1) Crush and grind the two biomass raw materials (mass ratio 1:1) of reeds and peanut shells, pass through a 60-mesh standard sieve, and dry in a cool place to remove non-wood impurities in them, and then place them at 105°C Dry to constant weight in a constant temperature drying box, set aside.

[0033] (2) Take the above-mentioned dry biomass raw material into the reaction kettle, add the prepared 20% glucose solution for soaking, soak for 24h, the mass ratio of the above-mentioned soaked biomass to the soaking solution is 1:5, centrifuge for dehydration, and then put it in 105 Dried to constant weight in a constant temperature drying oven at ℃, ready for use.

[0034] (3) The above-mentioned soaked biomass is pyrolyzed in a vacuum box-type atmosphere furnace at 600°C under nitrogen protection for 4 hours, cooled to r...

Embodiment 2

[0038] Such as figure 1 As shown, this embodiment provides a method for preparing acid-washed ZVI modified biochar, and the specific process is as follows:

[0039] (1) The bamboo, a biomass raw material, is crushed and ground, passed through a 30-mesh standard sieve, and dried in a cool place to remove the non-wood impurities, and then placed in a constant temperature drying oven at 105°C to dry to constant weight. use.

[0040] (2) Take the above-mentioned dry biomass raw material into the reactor, add the prepared 15% ferric sulfate solution to soak, soak for 24h, the mass ratio of the above-mentioned soaked biomass to the soaking solution is 1:4, centrifuge for dehydration, and place Dried to constant weight in a constant temperature drying oven at 105°C for use.

[0041] (3) The above-mentioned soaked biomass is pyrolyzed in a vacuum box atmosphere furnace at 500° C. under nitrogen protection for 5 hours, cooled to room temperature, ground, and passed through a 100-mesh standar...

Embodiment 3

[0045] Such as figure 1 As shown, this embodiment provides a method for preparing acid-washed ZVI modified biochar, and the specific process is as follows:

[0046] (1) Crush and grind four kinds of biomass raw materials (mass ratio 3:3:3:1) of reed, peanut shell, bamboo and coconut shell, pass a 20-mesh standard sieve, and place in a cool place to dry, and remove any non-toxic substances. Wood impurities are then placed in a constant temperature drying oven at 105°C to be dried to a constant weight, ready for use.

[0047] (2) Take the above-mentioned dry biomass raw material into the reactor, add the prepared 15% ferric sulfate solution to soak, soak for 24h, the mass ratio of the above-mentioned soaked biomass to the soaking solution is 1:5, centrifuge for dehydration, and then place Dried to constant weight in a constant temperature drying oven at 105°C for use.

[0048] (3) The above-mentioned soaked biomass is pyrolyzed in a vacuum box atmosphere furnace at 550°C under nitroge...

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Abstract

The invention provides a preparation method and application of acid pickled ZVI (zero-valent iron) modified charcoal. The preparation method comprises the following steps: 1) crushing, grinding and drying a biomass raw material; 2) carrying out soaking treatment on the dried biomass into a blended soaking solution, and carrying out centrifugal dehydration drying; 3) putting charcoal into an acid solution, carrying out stirring at a uniform speed at the room temperature, and carrying out centrifugal dehydration drying so as to obtain acid pickled charcoal; 5) under protection of an argon environment, putting the acid pickled charcoal into an iron solution, carrying out stirring for 1 hour at the room temperature, and dropping a NaBH4 solution to carry out a reaction; and 6) after the reaction is completed, carrying out centrifugal dehydration drying, so as to obtain the acid pickled ZVI modified charcoal. The acid pickled ZVI modified charcoal prepared by using the preparation method has a remarkable repairing effect on heavy metal Cr (VI) polluted soil, is capable of effectively reducing the content of Cr (VI) in the soil, and in addition is capable of effectively degrading bio-availability and migration of chromium in the soil.

Description

Technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and specifically relates to a preparation method and application of pickling ZVI modified biochar. Background technique [0002] Soil heavy metal pollution refers to the excess of various heavy metal elements in the soil, exceeding the limit value that the soil can bear. Excessive heavy metals have a great impact on the self-circulation capacity of the soil. According to statistics, the area of ​​polluted soil in my country currently reaches 50 million mu. The heavy metal elements in the soil mainly include mercury, cadmium, lead, chromium, zinc, copper and other elements. In recent years, the content of heavy metal elements in the soil has gradually increased. Studies have shown that the average content of chromium (Cr) in soil in China has reached 78.94 mg / kg, which is significantly higher than the background value of 57.30 mg / kg. Soil Cr pollution must be paid more attention....

Claims

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Application Information

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IPC IPC(8): C01B32/05C05D9/00C05G3/04A01B79/00C05G3/80
CPCC01B32/05C05D9/00A01B79/00C05G3/80
Inventor 赵攻城赵颖刘更生孙勇
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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