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Preparation method and application of cow dung biological carbon

A biochar, cow dung technology, applied in chemical instruments and methods, other chemical processes, restoration of polluted soil, etc., can solve the problems of limited adsorption sites, limited adsorption performance and stability, and achieve improved adsorption performance, Profound social significance and economic value, good stabilization effect

Active Publication Date: 2016-09-07
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrothermal biochar itself has limited surface adsorption sites, so its adsorption performance and stability are greatly limited.

Method used

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  • Preparation method and application of cow dung biological carbon
  • Preparation method and application of cow dung biological carbon
  • Preparation method and application of cow dung biological carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 A kind of preparation method of cow dung biochar

[0031] 1) Naturally air-dry the cow dung, crush it, and pass it through a 40-mesh sieve;

[0032] 2) Put the sieved powder in a vacuum tube furnace, seal it, and pyrolyze it under the condition of isolating the air; the specific process of pyrolysis is divided into: a heating section, a heat preservation section and a cooling section; the heating section is divided into 5~ 20°C min −1 The heating rate is raised to 200-500°C; the holding section is 2-5 hours at 200-500°C; the cooling section is natural cooling; nitrogen is used as a protective gas during the entire pyrolysis process, and the gas flow rate is 100 mL min −1 .

[0033] 3) Mix the pyrolyzed product with granular potassium hydroxide, add water, and heat at 180 rpm min −1 Stir for 180 min, filter, and take the filter residue;

[0034] Wherein, the mass ratio of pyrolyzed product to granular potassium hydroxide is 1:1.

[0035] 4) Wash the fil...

Embodiment 2

[0036] Embodiment 2 A kind of preparation method of cow dung biochar

[0037] 1) Naturally air-dry the cow dung, crush it, and pass it through a 40-mesh sieve;

[0038] 2) Put the sieved powder in a vacuum tube furnace, seal it, and pyrolyze it under the condition of isolating the air; the specific process of pyrolysis is divided into: heating section, holding section and cooling section; min −1 The heating rate was raised to 500°C; the heat preservation section was held at 500°C for 3 hours; the temperature drop section was natural cooling; nitrogen was used as a protective gas during the entire pyrolysis process, and the gas flow rate was 100 mL min −1 .

[0039] 3) Mix the pyrolyzed product with sodium hydroxide, add water, and heat at 160 rpm min −1 Stir for 6h, filter, and take the filter residue;

[0040] Wherein, the mass ratio of pyrolyzed product to sodium hydroxide is 1:0.5.

[0041] 4) Wash the filter residue with water and dry at 80°C to obtain cow dung biocha...

Embodiment 3

[0042] Embodiment 3 A kind of preparation method of cow dung biochar

[0043] 1) Naturally air-dry the cow dung, crush it, and pass it through a 40-mesh sieve;

[0044] 2) Put the sieved powder in a vacuum tube furnace, seal it, and pyrolyze it under the condition of isolating the air; the specific process of pyrolysis is divided into: heating section, holding section and cooling section; min −1 The heating rate was raised to 400°C; the heat preservation section was held at 400°C for 5 hours; the temperature drop section was natural cooling; nitrogen was used as a protective gas during the entire pyrolysis process, and the gas flow rate was 100 mL min −1 .

[0045] 3) Mix the pyrolyzed product with granular potassium hydroxide, add water, and −1 Stir for 2h, filter, and take the filter residue;

[0046] Wherein, the mass ratio of pyrolyzed product to granular potassium hydroxide is 1:0.5.

[0047] 4) Wash the filter residue with water and dry at 100°C to obtain cow dung b...

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Abstract

The invention discloses a preparation method and application of cow dung biological carbon. The method comprises the following steps: naturally air-drying, crushing and sieving with a sieve of more than 40 meshes cow dung; performing pyrolysis under an air-free condition; mixing a product obtained by pyrolysis and a strong alkaline solution, adding water for rapid and uniform stirring, performing clarifying and filtering, and extracting filter residues; performing washing and drying to obtain activated cow dung biological carbon. According to the preparation method and the application, adsorption and removal effects of the cow dung biological carbon on aqueous solutions of heavy metals lead, cadmium, zinc, copper, nickel and the like are greatly improved, better fixing effects on lead, cadmium, zinc, copper, nickel and the like in soil are achieved, acid soil can be improved, organic matters of the soil are improved, and soil carbon fixation is facilitated. The preparation method is simple, and has far-reaching social significance and economic value, conditions are mild, industrial production is facilitated, additional environmental hazards can be avoided, the utilization efficiency of biomass resources is improved, and the problem of difficulty in degradation and reutilization of agricultural and forestry biomass residues is solved.

Description

technical field [0001] The invention relates to a preparation method and application of cow dung biochar. Background technique [0002] At present, the preparation of biochar mainly focuses on the preparation of biochar by using sludge, agricultural waste, wood chips and other raw materials, and few reports have been made on the preparation of biochar from cow dung. [0003] With the rapid development of my country's cattle breeding industry, it is urgent to expand new resource utilization methods and approaches of cow dung to solve the problem of environmental pollution caused by excess cow dung. Therefore, the use of low-cost and abundant high-quality biomass resources such as cow dung to prepare biochar for the remediation of heavy metal pollution in water has gradually attracted people's attention. There are also some literatures on the adsorption of heavy metals in water by cow dung biochar, but the prepared cow dung biochar is not good in adsorption performance and st...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C01B31/02B09C1/00B09C1/08
CPCB01J20/20B01J2220/4887B09C1/00B09C1/08
Inventor 陈志良袁志辉刘敏超王欣戴玉蒋晓璐
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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