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

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

Active Publication Date: 2019-01-08
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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  • A kind of phosphorus-based biochar material and its preparation and application
  • A kind of phosphorus-based biochar material and its preparation and application
  • A kind of phosphorus-based biochar material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0039] (1) Use PDA medium to activate and expand Aspergillus niger (Aspergillus niger), purchased from China Type Culture Collection, strain number CCTCC AF 91006;

[0040] (2) 1.0g of hydroxyapatite nanoparticles (particle size 97%) was added to 200mL of liquid PDA culture medium, and ultrasonic dispersion with a power of 100 watts was used for 2 hours;

[0041] (3) Put the PDA medium containing nano-hydroxyapatite into a high-temperature autoclave, set 115°C, and sterilize for 25 minutes. After high temperature and high pressure sterilization, the culture medium is transferred to the ultra-clean aseptic operation table, and the ultraviolet light is turned on for 60 minutes;

[0042] (4) In an ultra-clean aseptic operating table, inoculate the activated mycelium in step (1) into the sterilized medium of step (3), the inoculation volume is 2 mL; the mass concentr...

Embodiment 2

[0049] The soil was taken from low-polluted paddy soil around a lead-zinc tailings pond. After removing gravel and broken roots, the test soil is air-dried naturally, mixed evenly by quarter method, and crushed through an 18-mesh nylon sieve. The soil pH is 6.58, which is weakly acidic. The content of available Cd in the soil is 7.01 mg / kg.

[0050] Separately add 0.2g of the phosphorus-based biochar material in Example 1 (containing the amount of n-HAP equal to the amount of pure n-HAP weighed) and pure n-HAP into 5.0g of low-polluting soil, mix well, and add 10mL After fixation for 7 days, use 25mL DTPA to extract the effective state of cadmium in the soil. After testing, the available cadmium content of low-polluted soil before and after the phosphorus-based biochar material or pure n-HAP treatment is shown in Table 1.

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

[0052]

Embodiment 3

[0054] The soil was taken from moderately polluted paddy soil around a lead-zinc tailings pond. After removing gravel and broken roots, the test soil is air-dried naturally, mixed evenly in quarters, and crushed through an 18-mesh nylon sieve. The soil pH is 6.52, which is weakly acidic. The content of available Cd 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 is equal to the amount of pure n-HAP weighed) and pure n-HAP into 5.0g of contaminated soil, mix well, and add 10mL After fixation for 7 days, use 25mL DTPA to extract the effective state of cadmium in the soil. After testing, the effective content of cadmium in the moderately polluted soil before and after treatment with phosphorus-based biochar material or pure n-HAP is shown in Table 2.

[0056] The content of available Cd in the 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 treating cadmium-contaminated soil by using the phosphorus-based biochar material. Background technique [0002] Recently, several batches of rice in many provinces led by Hunan have been found to have exceeded the standard of cadmium. The frequent occurrence of "cadmium rice" incidents has pushed soil heavy metal cadmium pollution to the forefront. Cadmium is one of the most biologically toxic heavy metal elements. It has strong chemical activity in the soil and long-lasting toxicity. It is easy to harm human health through the enrichment of the food chain. The soil heavy metal cadmium pollution situation is very serious. The National Soil Pollution Survey Bulletin published in April 2014 showed that cadmium has the highest rate of over-standard points a...

Claims

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Application Information

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Patent Type & Authority Patents(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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