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Phosphorus-based biochar material, and preparation and application thereof

A biochar and phosphorus-based technology, applied in the restoration of polluted soil, etc., can solve the problems of easy loss and difficult quantification of n-HAP, and achieve the effect of clean and sustainable process, convenient large-scale production, and high reactivity

Active Publication Date: 2016-05-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This fixative solves the problem that n-HAP is too dispersed and easy to lose in the soil, but it is difficult to quantitatively apply to soil remediation, and a lot of improvement is needed before industrial application

Method used

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  • Phosphorus-based biochar material, and preparation and application thereof
  • Phosphorus-based biochar material, and preparation and application thereof
  • Phosphorus-based biochar material, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0039] (1) Use PDA medium to activate and expand the cultivation of Aspergillus niger (Aspergillus niger), purchased from China Center for Type Culture Collection, strain number CCTCCAF91006;

[0040] (2) Add 1.0 g of hydroxyapatite nanoparticles (particle size97%) into 200mL of liquid PDA medium, and disperse for 2 hours with ultrasonic waves with a power of 100 watts;

[0041] (3) Put the PDA medium containing nano-hydroxyapatite 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 operating table, inoculate the activated mycelium in step (1) into the sterilized medium of step (3), t...

Embodiment 2

[0049] The soil was taken from low-pollution paddy soil around a lead-zinc tailings pond. The soil to be tested was air-dried after removing the gravel and broken roots, mixed in quarters, and crushed through a 18-mesh nylon sieve. The pH of the soil is 6.58, which is slightly acidic. The available Cd content in the soil is 7.01mg / kg.

[0050] Add 0.2g of the phosphorus-based biochar material in Example 1 (the amount of n-HAP contained is equal to the amount of pure n-HAP weighed) and pure n-HAP into 5.0g of low-pollution soil, mix well, add 10mL After 7 days of fixation, 25mL DTPA was used to extract the available state of cadmium in the soil. After testing, the available content of cadmium in low-pollution soil before and after treatment with phosphorus-based biochar materials or pure n-HAP is shown in Table 1 below.

[0051] Table 1 Available Cd content in low-polluted soil before and after treatment

[0052]

Embodiment 3

[0054] The soil was taken from moderately polluted paddy soil around a lead-zinc tailings pond. The soil to be tested was air-dried after removing the gravel and broken roots, mixed in quarters, and crushed through a 18-mesh nylon sieve. The pH of the soil is 6.52, which is slightly acidic. The available Cd content in the soil is 36.8mg / kg.

[0055] Add 0.2g of the phosphorus-based biochar material in Example 1 (the amount of n-HAP contained is equal to the amount of pure n-HAP weighed) and pure n-HAP into 5.0g of contaminated soil, mix well, add 10mL After 7 days of fixation, 25mL DTPA was used to extract the available state of cadmium in the soil. After testing, the available content of cadmium in medium-polluted soil before and after treatment with phosphorus-based biochar materials or pure n-HAP is shown in Table 2 below.

[0056] Available Cd content in contaminated soil before and after treatment in Table 2

[0057]

[0058]

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Abstract

The invention discloses a phosphorus-based biochar material, and preparation and application thereof. The phosphorus-based biochar material with a special structure and a special function is formed by performing anoxia high-temperature carbonization on mycelium pellets which are wrapped with nano hydroxyapatite and serve as a raw material. The synthesized phosphorus-based biochar material is uniformly mixed with soil according to a certain ratio to obtain a mixture; and after the mixture is cured for 7 days, the content of cadmium in an effective state in the soil is reduced by 44.8 to 50.1 percent, so that the treatment effect of the phosphorus-based biochar material is better than that of a pure-phosphorus-based material. The material preparation process is simple, and the cost is lower; biological degradation can be realized, and no secondary pollution is caused; and therefore, the phosphorus-based biochar material is an environment-friendly material.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal restoration, and specifically relates to a phosphorus-based biochar material and a preparation method thereof, and an application method for using the phosphorus-based biochar material to treat cadmium-contaminated soil. Background technique [0002] Recently, many batches of rice in many provinces led by Hunan have been detected to exceed the standard of cadmium. Cadmium is one of the most biologically toxic heavy metal elements. It has strong chemical activity and long-lasting toxicity in soil, and it is easy to endanger human health through the enrichment of the food chain. The situation of soil heavy metal cadmium pollution is very serious. The National Soil Pollution Survey Bulletin released in April 2014 showed that cadmium had the highest rate of exceeding the standard, and was officially identified as the primary pollutant in China's soil. Effective soil cadmium pollution control ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/105
Inventor 杨志辉粱丽芬柴立元侍维王海鹰李青竹唐崇俭闵小波
Owner CENT SOUTH UNIV
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