A zinc-rich biochar, its preparation method and its application in passivation restoration of heavy metal polluted soil

A technology of polluted soil and biochar, which is applied in the field of resource utilization of waste biomass and remediation of heavy metal-contaminated soil, to achieve the effects of solidifying heavy metals, improving utilization efficiency, and huge environmental and social benefits

Active Publication Date: 2022-01-07
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant reports on the use of furfural residues to produce biochar and use it for farmland soil remediation and improvement

Method used

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  • A zinc-rich biochar, its preparation method and its application in passivation restoration of heavy metal polluted soil
  • A zinc-rich biochar, its preparation method and its application in passivation restoration of heavy metal polluted soil
  • A zinc-rich biochar, its preparation method and its application in passivation restoration of heavy metal polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of zinc-rich biochar, specifically comprising the steps of:

[0034] (1) Pretreatment: Mix furfural slag, zinc oxide, and water according to the weight ratio of 30:0.85:70 and stir them evenly, and store them sealed at 35°C for 180 hours;

[0035] (2) Carbonization: put the mixture obtained in step 1) into a carbonization furnace, and heat it up to 400°C at a heating rate of 10°C / min for 2 h in a nitrogen atmosphere;

[0036] (3) Activation: Continue to heat up to 600°C at a heating rate of 10°C / min, activate for 1.5 h at a flow rate of carbon dioxide gas of 30 mL / min, and then cool rapidly to prepare zinc-rich biochar.

Embodiment 2

[0055] A method for preparing zinc-rich biochar (named PZn-KC-650), specifically comprising the following steps:

[0056] (1) Pretreatment: Mix furfural slag, zinc oxide, and water according to the weight ratio of 45:1.0:55 and stir them evenly, and store them sealed at 30°C for 200 hours;

[0057] (2) Carbonization: put the mixture obtained in step 1) into a carbonization furnace, and heat it up to 450°C at a rate of 10°C / min for 1.5 h under nitrogen atmosphere;

[0058] (3) Activation: continue to heat up to 650°C at a rate of 10°C / min, activate for 0.5 h at a flow rate of carbon dioxide gas of 20 mL / min, and then cool rapidly to prepare zinc-rich biochar.

Embodiment 3

[0060] A method for preparing zinc-enriched biochar (named PZn-KC-550), which specifically includes the following steps:

[0061] (1) Pretreatment: Mix furfural slag, zinc oxide, and water according to the weight ratio of 40:1.2:60 and stir them evenly, and store them sealed at 30°C for 240 hours;

[0062] (2) Carbonization: Put the mixture obtained in step 1) into a carbonization furnace, and heat it up to 350°C at a heating rate of 10°C / min for 3.0 h in a nitrogen atmosphere;

[0063] (3) Activation: continue to heat up to 550°C at a rate of 10°C / min, activate for 1.5 h at a flow rate of carbon dioxide gas of 30 mL / min, and then cool rapidly to prepare zinc-rich biochar.

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Abstract

The invention relates to a preparation method of zinc-rich biochar, including 1) pretreatment: mixing furfural slag, zinc oxide and water, and then sealing and storing at 20-50°C for 120-240 h; 2) carbonization: Under nitrogen atmosphere, the product obtained in step 1) was heated to 250-450°C for carbonization for 1-3 hours; 3) activation: the temperature was raised to 500-700°C, and activated at a flow rate of carbon dioxide gas of 10-60 mL / min for 0.5-2 hours , and then cooled, that is. The invention realizes the reduction and harmless disposal of furfural slag, reduces environmental discharge and pollution; the biochar obtained in the invention can effectively fix heavy metal pollutants, and has a good repair effect on heavy metal polluted farmland, which is an ideal Low-cost soil heavy metal pollution passivation remediation agent.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of waste biomass and remediation of heavy metal-contaminated soil, and specifically relates to a zinc-rich biochar, a preparation method thereof, and an application in passivation and remediation of heavy metal-contaminated soil. Background technique [0002] Biochar is a kind of porous carbon-rich material formed by pyrolysis of agricultural and forestry waste biomass under high temperature and anoxic conditions. Biochar can use its high specific surface area, cation exchange capacity (Cation Exchange Capacity, CEC), organic carbon content and active oxygen-containing functional groups and other characteristics, through physical adsorption, electrostatic adsorption, ion exchange, complexation, precipitation and redox. Directly adsorb heavy metal ions. At the same time, special components of biochar can indirectly affect the available state of heavy metals in soil or the accumulation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/02B09C1/08C09K101/00
CPCC09K17/02B09C1/08C09K2101/00
Inventor 刘珂珂董学亮余学军肖进彬张祥
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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