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Preparation method of sulfenyl-sulfydryl modified biochar and modified biochar

A biochar, modified technology, applied in chemical instruments and methods, fertilizer mixtures, organic fertilizers, etc., can solve the problems of environmental pollution, complex process, high cost of modified biochar preparation, and achieve large specific surface area, simple equipment, The effect of reducing mobility

Active Publication Date: 2017-12-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of sulfhydryl-sulfhydryl modified biochar and modified biochar to solve the problems of high preparation cost, complex process and environmental pollution of modified biochar

Method used

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  • Preparation method of sulfenyl-sulfydryl modified biochar and modified biochar
  • Preparation method of sulfenyl-sulfydryl modified biochar and modified biochar
  • Preparation method of sulfenyl-sulfydryl modified biochar and modified biochar

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Embodiment 1

[0033] A preparation method 1 of sulfhydryl-mercapto modified biochar, comprising the following steps:

[0034] (1) Dry the biochar in a digital blast drying oven at 45°C, then grind it into powder, pass it through an 80-mesh sieve, and set aside;

[0035] (2) Mix the prepared 0.40 mol / L sodium hydroxide solution and carbon disulfide solution according to the volume ratio of 1:0.5, stir in a water bath magnetic stirrer at room temperature for 5 hours, and use ultrasonication for 1.5 hours to prepare the thiolated modified solution. Sexual fluid;

[0036] (3) Mix the powdered biochar prepared in step (1) with the sulfur-based modified liquid prepared in step (2) according to the ratio of solid to liquid ratio of 1:4, keep stirring at 40°C for 6 hours, and then filter and place In a digital blast drying oven at 40°C, after drying, grind into powder and pass through an 80-mesh sieve to obtain sulfur-based modified biochar materials;

[0037] (4) Add the sulfur-based modified bi...

Embodiment 2

[0041] A preparation method 2 of sulfhydryl-sulfhydryl modified biochar, comprising the following steps:

[0042](1) Dry the biochar in a digital blast drying oven at 40°C, then grind it into powder, pass it through a 60-mesh sieve, and set aside;

[0043] (2) Mix the prepared 0.50mol / L sodium hydroxide solution and carbon disulfide solution according to the volume ratio of 1:1.5, stir in a water bath magnetic stirrer at room temperature for 6 hours, and use ultrasonication for 2 hours to obtain thiolation modification liquid;

[0044] (3) Mix the powdery biochar prepared in step (1) with the sulfur-based modified liquid prepared in step (2) according to the ratio of solid to liquid ratio of 1:5, keep stirring at 45°C for 8 hours, and put In a digital blast drying oven at 50°C, after drying, grind into powder and pass through a 100-mesh sieve to obtain sulfur-based modified biochar materials;

[0045] (4) Add the sulfur-based modified biochar material obtained in step (3) to...

Embodiment 3

[0047] A preparation method 3 of sulfhydryl-sulfhydryl modified biochar, comprising the following steps:

[0048] (1) Dry the biochar in a digital blast drying oven at 40°C, then grind it into powder, pass it through a 60-mesh sieve, and set aside;

[0049] (2) Mix the prepared 0.30mol / L sodium hydroxide solution and carbon disulfide solution in a volume ratio of 1:1, stir in a water-bath magnetic stirrer at room temperature for 4 hours, and use ultrasonication for 1 hour to obtain thiolation modification liquid;

[0050] (3) Mix the powdered biochar prepared in step (1) with the sulfur-based modified liquid prepared in step (2) according to the ratio of solid to liquid 1:3, keep stirring at 35°C for 6 hours, and then place Dry it in a digital blast drying oven at 40°C, grind it into a powder, and pass it through a 60-mesh sieve to obtain a sulfur-based modified biochar material;

[0051] (4) Add the sulfur-based modified biochar material obtained in step (3) to the prepared...

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Abstract

The invention discloses a preparation method of sulfenyl-sulfydryl modified biochar and modified biochar. The preparation method comprises the following steps: (1) preprocessing biochar; (2) preparing a sulfenyl modified solution; (3) preparing sulfydryl modified biochar; (4) preparing sulfenyl-sulfydryl modified biochar. The raw materials of the sulfenyl-sulfydryl modified biochar are sold in the market, low in price, and free from heavy metal, so that secondary pollution is avoided; in addition, the preparation process is simple, and mass production and application apply; the specific surface area of the biochar is large; cadmium is thiophile; the exchangeable cadmium in the soil plays absorbing, complexing and coprecipitating effects on the biochar, so that the available cadmium in the soil can be obviously curved; the content of organic matters in the soil can be increased; the soil fertility can be improved when the content of the organic matter in the soil is increased; moreover, metal ions can reduce the effectiveness of the heavy metal which is cadmium through the complexing effect.

Description

technical field [0001] The invention belongs to the technical field of remediation of soil heavy metal pollution, and relates to a preparation method of sulfur-mercapto modified biochar and the modified biochar. Background technique [0002] The rapid development of urbanization and industrialization and the extensive use of chemical fertilizers and pesticides have caused heavy metal pollutants to directly or indirectly enter the farmland soil. The toxicity mechanism and biological effects of heavy metals on organisms are different from other pollutants. They have the characteristics of strong enrichment, concealment, long-term, accumulation and high toxicity in organisms. At present, the rate of soil cadmium pollution in my country exceeds the standard by 7.0%, and the pollution in some areas is even higher, which has attracted widespread attention from all walks of life. Moreover, cadmium in the environment has strong chemical activity, high mobility, long-lasting toxicity...

Claims

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Application Information

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IPC IPC(8): C09K17/40C05G3/04C05G3/80
CPCC05G3/80C09K17/40
Inventor 吴川薛生国史力争邹奇崔梦倩安文慧
Owner CENT SOUTH UNIV
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