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Porous biochar as well as preparation method and application thereof

A biochar and waste biomass technology, which is applied in the field of environmental engineering, can solve the problems of complicated preparation process, microplastic pollution, and complicated process, and achieve the effects of increasing adsorption capacity, increasing adsorption rate, and reducing diffusion resistance.

Pending Publication Date: 2022-07-29
NANJING TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain a very high specific surface area, the simultaneous use of alkaline activation reagents and wood vinegar reagents causes high costs, and in this method, the biochar raw material itself without activation treatment has a very high specific surface area, but The literature shows that the specific surface area of ​​most biochar raw materials without activation is relatively low. Considering the particularity of biochar raw materials in this method, this method is not suitable for the advanced treatment of most raw materials and is not scalable.
Patent CN113371709A discloses a preparation method of rice husk-based biochar material with high specific surface area. The method uses rice husk as raw material, undergoes pickling, carbonization, KOH silicon-dissolving reaction and activation, although biochar with very high specific surface area is obtained. Carbon materials, but the preparation process is too cumbersome
Patent CN 104291505 A discloses a method and system for increasing the specific surface area of ​​sludge biochar. The dried sludge and crushed polystyrene waste plastics are stirred and mixed in proportion and heated to make the polystyrene waste plastics The melt is realized in the sludge and relatively uniformly attached to the surface of the sludge particles, and then directly pressed into shape; the pressed sludge particles are sent to the pyrolysis carbonization system for carbonization treatment, and sludge pyrolysis organisms with good pore structure can be obtained Although the specific surface area of ​​pyrolyzed biochar obtained by this method is 100-400% higher than that of biochar alone, microplastic leakage may occur during use of this biochar, causing microplastic pollution
[0005] In the existing technology, the preparation technology of porous biochar with high specific surface area is relatively lacking. At present, the existing technology has problems such as high industrial production cost, low technology promotion, cumbersome process, easy to cause secondary pollution, etc., and the cost of urgent need is relatively low. Development of biochar technology with high promotion, simple process and no secondary pollution

Method used

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  • Porous biochar as well as preparation method and application thereof
  • Porous biochar as well as preparation method and application thereof
  • Porous biochar as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0030] A preparation method of porous biochar according to the present invention comprises the following steps:

[0031] (1) Preparation of primary biochar: The dried waste biomass was pulverized by a high-speed universal pulverizer and passed through a 60-mesh sieve, and then a certain mass of biomass powder was weighed and placed in a tubular resistance furnace. The temperature is raised to 380-450°C at a rate of 8-12°C / min for calcination, maintained for 1-2h, and then cooled down naturally to obtain primary biochar.

[0032] (2) Preparation of alkali-modified biochar: Weigh a certain mass of alkaline reagent and add water to make a solution, and add primary biochar to alkaline in a mass ratio of 1:1-1:3 (primary biochar: alkaline reagent). In the reagent solution, the mixed solution is placed in a water bath shaker, shaken at a low speed, shaken and mixed for 4-6 hours, the water bath temperature is 80-100 ℃, until the water evaporates to dryness, and the alkali-modified b...

Embodiment 1

[0037] Example 1 Preparation of high specific surface area porous biochar based on wolfberry branches and adsorption and removal of chloramphenicol

[0038] The dried wolfberry branches are crushed by a high-speed universal pulverizer and passed through a 60-mesh sieve, and then a certain quality of wolfberry branch powder is weighed and placed in a tubular resistance furnace, maintaining a nitrogen atmosphere, and heating up to 400°C at a rate of 10°C / min. calcined, kept for 2 h, and then cooled naturally to obtain primary biochar. Weigh a certain mass of alkaline reagent NaOH and add water to make a solution, add primary biochar to the alkaline reagent solution at a mass ratio of 1:1 (primary biochar: alkaline reagent), and then place the mixed solution in a water bath shaker , low-speed shaking, shaking and mixing for 4-6 hours, the water bath temperature is 80 °C, until the water evaporates to dryness, and the alkali-modified biochar is obtained; then it is placed in a tub...

Embodiment 2

[0044] Example 2 Preparation of corncob-based porous biochar with high specific surface area and adsorption and removal of methylene blue

[0045] Pulverize the dried corncob with a high-speed universal pulverizer and pass it through a 60-mesh sieve, then weigh a certain quality of corncob powder and place it in a tubular resistance furnace, maintain a nitrogen atmosphere, and heat up to 400°C at a rate of 10°C / min. calcined, kept for 1 h, and then cooled naturally to obtain primary biochar. Weigh a certain mass of alkaline reagent NaOH and add water to make a solution, add primary biochar to the alkaline reagent solution at a mass ratio of 1:2 (primary biochar: alkaline reagent), and then place the mixed solution in a water bath shaker , low-speed shaking, shaking and mixing for 4-6 hours, the water bath temperature is 80 °C, until the water evaporates to dryness, and the alkali-modified biochar is obtained; then it is placed in a tubular resistance furnace, maintaining a nit...

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Abstract

The invention discloses a preparation method of porous biochar. The preparation method comprises the following steps: S1, carrying out low-temperature carbonization in a nitrogen atmosphere to obtain primary biochar; s2, dipping the primary biochar in alkali liquor, and evaporating water to dryness to obtain alkali modified biochar; s3, performing high-temperature pyrolysis carbonization on the alkali-modified biochar in a nitrogen atmosphere to obtain primary porous biochar with a high specific surface area; and S4, washing the sample obtained in the step S3 with deionized water until the pH value of the filtrate is neutral, and drying to obtain the porous biochar material. The specific surface area of the porous biochar material with high specific surface area prepared by the method reaches 1900-2050m < 2 > / g, the total pore volume is 1.165-1.190 cm < 3 > / g, and the porous biochar material has a hierarchical pore structure. The prepared porous biochar can be used for adsorbing organic pollutants in a water body.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and particularly relates to a preparation method of porous biochar with high specific surface area, the prepared porous biochar material and application thereof. Background technique [0002] Biomass resources such as crop straws are a kind of renewable and clean resources, and the effective use of them will not only help reduce the dependence of economic development on traditional energy, ensure national energy security, but also help solve the problem of greenhouse effect and environmental pollution . At present, there are still many problems in the utilization of straw resources in my country. How to scientifically and efficiently utilize rural straw resources and evaluate and expand the comprehensive effect of straw resource utilization has become a hot issue that the government, society and academia are concerned about. [0003] Organic pollution is the main type of water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J20/32C02F1/28C02F101/30
CPCB01J20/20B01J20/3078B01J20/3238B01J20/28057B01J20/28066B01J20/28088B01J20/2808B01J20/28083B01J20/28085C02F1/281C02F1/283C02F2101/30
Inventor 周俊王改红颜素雍晓雨
Owner NANJING TECH UNIV