Preparation method and application of phosphorus-modified biochar

A phosphorus modification and biochar technology is applied in the field of agricultural resources and environment, and achieves the effects of simple steps, improvement of phosphorus content, economical and easy realization of equipment and preparation process

Active Publication Date: 2020-10-30
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the synergistic treatment of heavy metal pollution and the regulation of soil acid-base and phosphorus levels by functionalized biochar in alkaline soils

Method used

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  • Preparation method and application of phosphorus-modified biochar

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0037] Step 1: the animal husbandry waste pig manure is naturally dried to make the water content below 35%, which is used as the raw material for biochar preparation;

[0038] Step 2: Pyrolyze the biochar raw material at 700°C for 2 hours in an atmosphere furnace or muffle furnace, and obtain a biochar sample after natural cooling;

[0039] Step 3: Mix the biochar and red phosphorus prepared in step 3 evenly in a mass ratio of 100:2, and then put 20g of the sample into the agate ball mill jar, and add 100g of agate balls to the agate jar at the same time;

[0040] Step 4: The agate jar was placed in a planetary ball mill, and after ball milling at a speed of 250 rpm for 5 hours, phosphorus-modified biochar was obtained.

Embodiment 3

[0044] Step 1: Crush forestry waste branches into segments and blocks of about 2 centimeters, and let the water content reach below 35% by natural drying, as raw materials for biochar preparation;

[0045]Step 2: Pyrolyze the biochar raw material at 500°C for 2 hours in an atmosphere furnace or muffle furnace, and obtain a biochar sample after natural cooling;

[0046] Step 3: Mix the biochar and red phosphorus prepared in step 2 evenly in a mass ratio of 100:5, and then put 30g of the sample into the agate ball mill jar, and add 200g of agate balls to the agate jar at the same time;

[0047] Step 4: The agate jar was placed in a planetary ball mill, and after ball milling at a speed of 300 rpm for 6 hours, phosphorus-modified biochar was obtained.

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Abstract

The invention discloses a preparation method of phosphorus-modified biochar, which comprises the following steps: carrying out high-temperature carbonization on agricultural wastes to obtain biochar,and further carrying out ball milling on the biochar and red phosphorus according to a certain ratio, thereby loading the red phosphorus onto the biochar in the ball milling process to form the phosphorus-modified biochar. The phosphorus-modified biochar can be used for treating heavy metal pollution of a water body; slow oxidation can also be carried out in a soil environment, and conversion intophosphoric acid is realized, hydrogen ions and phosphate radicals are released, the hydrogen ions can increase the pH of the soil, the phosphate radicals can maintain the level of available phosphorus in the soil for a long time by precipitating and complexing the heavy metal ions and calcium and magnesium ions, and the purpose of synergistically treating heavy metal pollution and salinization ofthe soil is achieved.

Description

technical field [0001] The application relates to the technical field of agricultural resources and environment, and specifically relates to a method for preparing phosphorus-modified biochar and its application. Background technique [0002] Heavy metals are very harmful to the human body. Long-term low-dose exposure, the incubation period of heavy metal hazards can be as high as 30 years, and the hazards are irreversible. The "National Soil Pollution Survey Bulletin" published in 2015 pointed out that heavy metals are the main pollutants in my country's soil, accounting for more than 70% of the excess points. Since heavy metals cannot be degraded, they accumulate year by year, and the capacity of heavy metals in some farmland soils has been saturated, and agricultural products exceeding the standard have been produced. However, the work of treating heavy metal-contaminated soil is very expensive, and some cutting-edge technologies are usually only applicable to small area...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C09K17/02B09C1/08C09K109/00
CPCB09C1/08C09K17/02C09K2109/00C01B32/05
Inventor 张鹏薛冰孙红文
Owner NANKAI UNIV
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