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A kind of iron-based biochar material and its preparation and application

A biochar, iron-based technology, applied in applications, soil conditioning materials, organic fertilizers, etc., can solve problems such as arsenic increase, and achieve the effects of extremely low production cost, high adsorption capacity, and easy mass production.

Active Publication Date: 2019-04-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another study reported that adding biochar can improve the microenvironment of rice rhizosphere and promote the formation of iron film on the root surface, and the concentrations of Cd, Zn and Pb in rice roots can be reduced by 98%, 83% and 72%, respectively. However, the concentration of arsenic Concentration increased by 327%

Method used

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  • A kind of iron-based biochar material and its preparation and application
  • A kind of iron-based biochar material and its preparation and application
  • A kind of iron-based biochar material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Prepare the iron-based biochar material for repairing arsenic-contaminated soil of the present invention:

[0039] (1) Aspergillus niger (Aspergillus niger) was activated and expanded by PDA medium, which was purchased from China Center for Type Culture Collection, strain number CCTCC AF 91006;

[0040] (2) 1.0g of α-Fe 2 o 3 Add nanoparticles (particle size99.5%) into 200mL of liquid PDA medium, and disperse for 2h with an ultrasonic wave with a power of 100W;

[0041] (3) will contain nano-α-Fe 2 o 3 Put the PDA culture medium into a high-temperature and high-pressure sterilizer, set at 115°C, and sterilize for 25 minutes. After high-temperature and high-pressure sterilization, the culture medium was transferred to an ultra-clean aseptic operating table, and sterilized with an ultraviolet lamp for 60 minutes;

[0042] (4) In the ultra-clean aseptic operation bench, inoculate the activated mycelium in step (1) into the sterilized medium of step (3), the inoculum s...

Embodiment 2

[0049] The soil was taken from a realgar mine waste dump. After being air-dried, impurity-removed and ground, the soil was passed through a 18-mesh nylon sieve. The pH value of the soil was 7.73, and the water-soluble As in the soil was 33.18mg / kg.

[0050] The iron-based biochar material of Example 1 and pure nano-α-Fe were respectively 2 o 3 (Nano α-Fe is contained in the iron-based biochar material 2 o 3 Quantity and weighed pure nano-α-Fe 2 o 3 equal amounts, both 0.2g) into 5.0g of arsenic-contaminated soil, add deionized water according to the water-to-soil mass ratio of 2:1, and stir until uniform. After one week of fixation, water-soluble arsenic in the soil was extracted with 50 mL of deionized water. After testing, arsenic-contaminated soil was treated with iron-based biochar materials or pure nano-α-Fe 2 o 3 The content of water-soluble As in the soil before and after treatment is shown in Table 1 below.

[0051] Table 1 Water-soluble content of arsenic-con...

Embodiment 3

[0054] The soil was taken from a realgar mine waste dump. After being air-dried, impurity-removed and ground, the soil was passed through a 18-mesh nylon sieve. The pH value of the soil is 7.73, and the available As in the soil is 288.17mg / kg.

[0055] The iron-based biochar material of Example 1 and pure nano-α-Fe were respectively 2 o 3 (Nano α-Fe is contained in the iron-based biochar material 2 o 3 Quantity and weighed pure nano-α-Fe 2 o 3 equal amounts, both 0.2g) into 5.0g of arsenic-contaminated soil, add deionized water according to the water-to-soil mass ratio of 2:1, and stir until uniform. After one week of fixation, use 50 mL of 0.5 mol / L NaHCO 3 Extract the available arsenic in the soil. After testing, arsenic-contaminated soil was treated with iron-based biochar materials or pure nano-α-Fe 2 o 3 The content of available As in the soil before and after treatment is shown in Table 2 below.

[0056] Table 2 Content of available As in arsenic-contaminated s...

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Abstract

The invention discloses an iron-based biochar material as well as preparation and application thereof. In the invention, by adopting nano alpha-Fe2O3 as a center substance and wrapping the nano alpha-Fe2O3 with aspergillus niger hyphe, the iron-based biochar material for arsenic-polluted soil remediation is prepared through anoxic high-temperature carbonization. The synthesized iron-based biochar material is uniformly mixed with soil according to certain proportion; and after a period of time, the fixed rate of the water-soluble state arsenic and effective-state arsenic in the arsenic-polluted soil reaches 59.6% and 66.2% respectively. The iron-based biochar material disclosed by the invention has the advantages of easiness in preparation, high efficiency without toxicity, biodegradability and no secondary pollution or damage of physicochemical properties of soil and is an environment-friendly fixing agent.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal restoration, and specifically relates to an iron-based biochar material and a preparation method thereof, and an application method for using the iron-based biochar material to treat arsenic-contaminated soil. Background technique [0002] Arsenic occupies the 20th place in the earth's crust and is a widely distributed toxic and carcinogenic chemical element. Arsenic in soil mainly comes from agriculture and industry, such as the mining and use of high-arsenic coal, which causes a large amount of arsenic in coal to be released, causing serious pollution to water bodies and soil environments, and further affecting human health. Soil is an important storage and transfer station for arsenic. Soil arsenic pollution has the characteristics of concealment, long-term, irreversibility and enrichment. The mobility of arsenic in soil depends largely on its existing form and determines its Degree o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/02B09C1/08
CPCB09C1/08C09K17/02
Inventor 杨志辉柴立元侍维粱丽芬王海鹰李青竹唐崇俭王庆伟
Owner CENT SOUTH UNIV
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