Preparation method and application of pyrophosphate modified biochar

A technology of pyrophosphate and biochar, applied in biofuels, chemical instruments and methods, coke ovens, etc., can solve problems such as heavy metal pollution in water bodies and soils, achieve improved adsorption and fixation capabilities, simple steps, and good repair effects Effect

Pending Publication Date: 2021-07-27
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of heavy metal pollution in water and soil in the prior art, to provide a method for preparing pyrophosphate modified biochar, thereby improving the adsorption capacity of biochar to heavy metals in water and soil

Method used

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  • Preparation method and application of pyrophosphate modified biochar
  • Preparation method and application of pyrophosphate modified biochar
  • Preparation method and application of pyrophosphate modified biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of sodium pyrophosphate modified biochar, comprising the following steps:

[0043] Step 1. Pretreatment of agricultural, forestry and animal husbandry wastes

[0044] The agricultural, forestry and animal husbandry wastes are crushed into 1 cm pieces, and the moisture content is below 35% by natural drying;

[0045] Step 2. Ball Milling Treatment

[0046] Add 10g of agricultural, forestry and animal husbandry waste and distilled water pulverized in step 1 into the agate ball mill in a ratio of 1:10, and add 200g of agate balls. -1 Step 3. Hydrothermal carbonization Pour the ball-milled biomass in step 2 into a hydrothermal reaction kettle, add distilled water in a ratio of 5:1, hydrothermally heat it at 200 °C for 6 hours, and dry to obtain a prepared hydrothermal biomass carbon;

[0047] Step 4. Doping and Pyrolytic Carbonization of Pyrophosphate

[0048] (1) Mix the hydrothermal biochar in step 3, sodium pyrophosphate and distilled water accordi...

Embodiment 2

[0052] A preparation method of sodium pyrophosphate modified biochar, comprising the following steps:

[0053] Step 1. Pretreatment of agricultural, forestry and animal husbandry wastes

[0054] The agricultural, forestry and animal husbandry waste is crushed into 1 cm pieces and blocks, and the moisture content is below 25% by natural drying;

[0055] Step 2. Ball Milling Treatment

[0056] Add 10g of agricultural, forestry and animal husbandry waste and distilled water pulverized in step 1 into the agate ball mill in a ratio of 1:5, and add 150g of agate balls, and ball mill in a planetary ball mill at a speed of 220r·min-1 for 12h;

[0057] Step 3. Hydrothermal Carbonization

[0058] Pour the ball-milled biomass in step 2 into a hydrothermal reactor, add distilled water in a ratio of 10:1, hydrothermally heat it at 220°C for 5 hours, and dry to obtain hydrothermal biochar;

[0059] Step 4. Doping and Pyrolytic Carbonization of Pyrophosphate

[0060] (1) Mix the hydrothe...

Embodiment 3

[0064] A preparation method of sodium pyrophosphate modified biochar, comprising the following steps:

[0065] Step 1. Pretreatment of agricultural, forestry and animal husbandry wastes

[0066] The agricultural, forestry and animal husbandry wastes are crushed into 1 cm segments and blocks, and the moisture content is below 20% by natural drying;

[0067] Step 2. Ball Milling Treatment

[0068] Add 10g of agricultural, forestry and animal husbandry waste and distilled water pulverized in step 1 into the agate ball mill in a ratio of 1:8, and add 200g of agate balls, and ball mill in the planetary ball mill at a speed of 200r·min-1 for 4h;

[0069] Step 3. Doping and Pyrolytic Carbonization of Pyrophosphate

[0070] (1) Mix the biomass, sodium pyrophosphate and distilled water in step 2 according to the mass ratio of 1:1:5, and use a stirrer to stir at a speed of 700r·min-1 for 5h at room temperature;

[0071] (2) The above materials are dried and placed in an atmosphere fu...

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Abstract

The invention discloses a preparation method of phosphorus-modified biochar developed by modifying agriculture, forestry and animal husbandry wastes and pyrophosphate. The method comprises the following steps: carrying out ball milling and hydrothermal technologies on agriculture, forestry and animal husbandry wastes to reconstruct primary substances in the aspects of structure and dimension, and fully mixing the primary substances with pyrophosphate, carbonizing at a high temperature of 400-900 DEG C so as to make the pyrophosphate form a phosphorus-containing group in the pyrolysis process, and loading the phosphorus-containing group on the biochar to finally form the pyrophosphate modified biochar. The pyrophosphate modified ecological carbon provided by the invention can improve the adsorption capacity of biochar to heavy metals in water and soil, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of modified biochar, and in particular relates to a preparation method for preparing modified biochar by utilizing agricultural, forestry and animal husbandry waste and pyrophosphate. Background technique [0002] In recent years, with the rapid development of industrialization and urbanization, a large amount of industrial wastewater containing heavy metals has been discharged into the environment, and the content of heavy metals in many water bodies and soils has exceeded safety standards. Heavy metal ions such as lead, cadmium, zinc, chromium, and copper are enriched and difficult to degrade, and will not be degraded by natural biological / chemical degradation, but will accumulate in water and soil, causing water and soil pollution. In addition, heavy metals have the characteristics of high toxicity and bioaccumulation, which will cause serious harm to human health after entering the human body. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/02B01J20/30B01J20/32C10B53/00C10B53/02C10B57/06C02F1/28B09C1/00C02F101/20
CPCB01J20/20B01J20/0259B01J20/3078B01J20/3204C10B53/00C10B53/02C10B57/06C10L9/086C02F1/283B09C1/00C02F2101/20B01J2220/42Y02E50/10
Inventor 张鹏黄鹏孙红文姚梦东倪鑫鑫王翠苹冯国杰郝越力苗竹
Owner NANKAI UNIV
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