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Preparation method of heavy metal cadmium stabilizer sulfur-iron-based composite modified biochar and modified biochar

A composite modification and biochar technology, which is applied in fertilizer mixtures, chemical instruments and methods, agricultural machinery and implements, etc., can solve the problems of high cost, complicated process and long cycle of modified biochar preparation, and achieve significant curing effect , The effect of simple preparation process and simple equipment

Active Publication Date: 2020-07-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of preparation method of heavy metal cadmium stabilizer sulfur base-iron base composite modified biochar and the modified biochar obtained by this method, to solve the problem of high cost, long cycle, complex process issues

Method used

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  • Preparation method of heavy metal cadmium stabilizer sulfur-iron-based composite modified biochar and modified biochar
  • Preparation method of heavy metal cadmium stabilizer sulfur-iron-based composite modified biochar and modified biochar
  • Preparation method of heavy metal cadmium stabilizer sulfur-iron-based composite modified biochar and modified biochar

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Effect test

Embodiment 1

[0028] The preparation method 1 of sulfur-based-iron-based composite modified biochar comprises the following steps:

[0029] (1) Grind the biochar into powder, pass through a 100-mesh sieve, and set aside;

[0030] (2) Mix 0.30mol / L sodium hydroxide solution and carbon disulfide solution according to the volume ratio of 1:0.5, stir at room temperature for 5h, and apply ultrasonication for 1.5h to prepare the mixed solution;

[0031] (3) Mix the biochar prepared in step (1) with the mixed liquid obtained in step (2) at a solid-to-liquid ratio of 1:3, keep stirring at 40°C for 6 hours, filter with suction, and dry the solid matter at 45°C Finally, it is ground into powder and passed through a 100-mesh sieve to obtain sulfur-based biochar;

[0032] (4) Mix the sulfur-based biochar obtained from step (3) with 0.8mol / L ferrous sulfate solution at a solid-to-liquid ratio of 1:4, keep stirring at 35°C for 12 hours, ultrasonically disperse for 2 hours, and filter to obtain a solid ...

Embodiment 2

[0036] The preparation method 2 of sulfur-based-iron-based composite modified biochar comprises the following steps:

[0037] (1) Grinding the biochar into powder, passing through an 80-mesh sieve, for use;

[0038] (2) Mix 0.80 mol / L sodium hydroxide solution and carbon disulfide solution at a volume ratio of 1:1, stir at room temperature for 6 hours, and apply ultrasonication for 2 hours to prepare a mixed solution;

[0039] (3) Mix the biochar prepared in step (1) with the mixed liquid obtained in step (2) at a solid-to-liquid ratio of 1:4, keep stirring at 45°C for 8 hours, filter with suction, and dry the solid matter at 45°C Finally, it is ground into powder and passed through a 100-mesh sieve to obtain sulfur-based biochar;

[0040] (4) Mix the sulfur-based biochar worth in step (3) with 1.5mol / L ferrous sulfate solution at a solid-to-liquid ratio of 1:6, keep stirring at 35°C for 16 hours, ultrasonically disperse for 2 hours, and filter to obtain a solid material, an...

Embodiment 3

[0042] The preparation method 3 of sulfur-based-iron-based composite modified biochar comprises the following steps:

[0043] (1) Grinding the biochar into powder, passing through a 60-mesh sieve, for use;

[0044] (2) Mix 0.50 mol / L sodium hydroxide solution and carbon disulfide solution according to the volume ratio of 1:1.5, stir at room temperature for 4 hours, and use ultrasonication for 2 hours to prepare a mixed solution;

[0045] (3) Mix the biochar prepared above with the mixed liquid obtained in step (2) according to the solid-to-liquid ratio of 1:5, keep stirring at 40°C for 6 hours, then filter with suction, separate the solid from the liquid, and dry the solid matter at 45°C Finally, it is ground into powder and passed through a 100-mesh sieve to obtain sulfur-based biochar;

[0046] (4) Mix the sulfur-based biochar worth in step (3) with 1.2mol / L ferric sulfate solution at a solid-to-liquid ratio of 1:5, keep stirring at 35°C for 10h, ultrasonically disperse for...

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Abstract

The invention discloses a method for preparing heavy metal cadmium stabilizer sulfenyl-ferrous composite modified charcoal and sulfenyl-ferrous composite modified charcoal prepared with the method. The method comprises the following steps: (1) preparing charcoal; (2) preparing a sulfenyl modification solution; (3) preparing a sulfenyl charcoal precursor; (4) preparing the sulfenyl-ferrous composite modified charcoal. The sulfenyl-ferrous composite modified charcoal prepared with the method is not only low in price and good in environmental-friendliness, but also simple in preparation process and easy in large-scale production and application; meanwhile, the content of organic matters in soil is remarkably increased, and the soil fertility is improved; relatively good adsorption, complexing and coprecipitation functions on exchangeable cadmium in soil are achieved, and effective cadmium in the soil can be remarkably immobilized.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal restoration and treatment, and in particular relates to a preparation method of a heavy metal cadmium stabilizer sulfur-iron-based composite modified biochar and the modified biochar. Background technique [0002] Cadmium (Cd) is a highly toxic substance, which has the characteristics of concealment, long-term, accumulation and irreversibility. Accumulation to a certain extent in the soil will not only lead to soil degradation and decrease in the quality of agricultural products, but also cause harm through the food chain. human health. For example, the cadmium pollution incident in Liuyang, Hunan Province in 2009 and the cadmium pollution incident in Guangxi in 2012 have attracted widespread attention. In 2014, the "National Soil Pollution Survey Bulletin" of the Ministry of Environmental Protection and the Ministry of Land and Resources of my country showed that the excessive proportio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/04C09K101/00
CPCC09K17/04C09K2101/00
Inventor 吴川薛生国史力争滑子龙邓浩宇黄培成
Owner CENT SOUTH UNIV
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