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Iron-based bio-char material, preparation process thereof, and application thereof in soil pollution treatment

一种生物炭、铁基的技术，应用在污染的土壤的复原、应用、土壤调节材料等方向，能够解决降低有效性等问题，达到保持有效性、减少土壤镉砷吸收、生产成本低的效果

Active Publication Date: 2015-03-04
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bioavailability of arsenic depends on its valence and form, promoting the oxidation and adsorption and fixation of arsenic in soil can reduce its availability

Method used

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  • Iron-based bio-char material, preparation process thereof, and application thereof in soil pollution treatment
  • Iron-based bio-char material, preparation process thereof, and application thereof in soil pollution treatment
  • Iron-based bio-char material, preparation process thereof, and application thereof in soil pollution treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 Preparation of iron-based biochar material sample 1

[0040] 1. Preparation of biochar materials

[0041] Dry the palm, weigh 10kg and crush it, place it in a high-temperature furnace, slowly heat it to 200°C, keep the temperature constant for 2 hours, raise the temperature at a rate of 5°C / min, then heat it to 800°C, and keep it at this temperature for 3 hours. Stop heating and prepare biochar material.

[0042] 2. Preparation of Iron and Biochar Mixture

[0043] Weigh 2500g of ferrous sulfate solid, and add it to the biochar material prepared in Example 1 under stirring condition to obtain a mixture of iron and biochar, wherein the mass percentage of carbon:iron is 9:1, and stir for 1 hour.

[0044] 3. Activation of biochar materials

[0045] Weigh 500 g of sodium borohydride, dissolve it in 500 mL of purified water, and prepare a sodium borohydride reducing agent solution with a mass percentage of 1%.

[0046] Slowly add the above-mentioned sodium bo...

Embodiment 2

[0051] Embodiment 2 Preparation of iron-based biochar material sample 2

[0052] 1. Preparation of biochar materials

[0053] Dry the palm, weigh 10kg and crush it, place it in a high-temperature furnace, slowly heat it to 200°C, keep the temperature constant for 2 hours, raise the temperature at a rate of 5°C / min, then heat it to 300°C, and keep it at this temperature for 12 hours. Stop heating and prepare biochar material.

[0054] 2. Preparation of Iron and Biochar Mixture

[0055] Weigh 1250g of ferric nitrate solid, and add it to the biochar material prepared in step 1 under stirring condition to obtain a mixture of iron and biochar, wherein the mass percentage of carbon:iron is 9:1, and stir for 1 hour.

[0056] 3. Activation of biochar materials

[0057] Weigh 50 g of sodium borohydride, dissolve it in 250 mL of pure water, and prepare a sodium borohydride reducing agent solution with a mass percentage of 0.2%.

[0058] Slowly add the above-mentioned sodium borohydr...

Embodiment 3

[0063] Embodiment 3 Preparation of iron-based biochar material sample 3

[0064] 1. Preparation of biochar materials

[0065] Dry the chaff, weigh 10kg and break it, place it in a high-temperature furnace, slowly heat it to 200°C, keep the temperature constant for 2 hours, raise the temperature at a rate of 5°C / min, then heat it to 500°C, and keep it at this temperature for 9 hours , stop heating, and prepare biochar material.

[0066] 2. Preparation of Iron and Biochar Mixture

[0067] Weigh 250g of ferric sulfate solid, and add it to the biochar material prepared in step 1 under stirring condition to obtain a mixture of iron and biochar, wherein the mass percentage of carbon:iron is 50:1, and stir for 1 hour.

[0068] 3. Activation of biochar materials

[0069] Weigh 5 g of sodium borohydride, dissolve it in 500 mL of purified water, and prepare a sodium borohydride reducing agent solution with a mass percentage of 0.01%.

[0070] Slowly add the above-mentioned sodium bo...

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Abstract

The invention relates to the technical field of soil heavy metal remediation, and specifically discloses a method for preparing an iron-based bio-char material, a prepared iron-based bio-char material, and a method for applying the iron-based bio-char material in treating soil heavy metal pollution. According to the material, biomass is adopted as a raw material; a high-temperature carbonization method is adopted; during the bio-char preparation process, an iron-containing compound is added, such that iron is doped according to a certain ratio, and the iron-based bio-char material with special structure and function is formed. The material has the advantages of simple preparation process, low production cost, and short production period. The obtained iron-based bio-char material has a unique effect in repairing arsenic-cadmium composite polluted soil. With the material, bio-availability of arsenic and cadmium in soil can be effectively reduced, arsenic and cadmium contents in agricultural products planted in the arsenic-cadmium composite polluted soil can be greatly reduced, and no toxic or side effect is caused on crops. The material is safe to apply, and can be used in a large scale in treatment of arsenic-cadmium composite polluted soil.

Description

technical field [0001] The invention relates to the field of soil heavy metal restoration, in particular to an iron-based biochar material, its preparation process and its application in soil pollution control. Background technique [0002] In heavy metal-polluted soil, arsenic-cadmium complex pollution is a prominent problem. About one-sixth of the paddy fields are subject to varying degrees of arsenic-cadmium complex pollution, and the polluted area is increasing year by year. Mine mining and smelting are the main ways of combined soil arsenic and cadmium pollution. Waste slag and tailing sand usually contain high concentrations of arsenic and cadmium waste ore or tailings. After natural weathering and rain erosion, arsenic and cadmium will be released into the soil. As a result, the soil is severely polluted by arsenic and cadmium compounds. Excessive cadmium and arsenic will cause gradual variation of soil biological characteristics, resulting in a decline in soil quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02B09C1/08
CPCB09C1/08B01J2220/485B01F23/411C01G49/14C09K17/40
Inventor 李芳柏崔江虎刘传平刘承帅
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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