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Preparation method for lamellar porous biocarbon with good adsorption function

A technology of biochar and strong adsorption, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve problems such as easy migration, great harm, and difficult to degrade, so as to reduce the degree of non-point source pollution and greatly The effect of enhancing adsorption performance and pollutant capacity

Inactive Publication Date: 2017-07-11
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing sheet-layer porous biochar with strong adsorption function in order to solve the problems of refractory degradation, easy migration and great harm of pesticides in water bodies in the prior art

Method used

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  • Preparation method for lamellar porous biocarbon with good adsorption function
  • Preparation method for lamellar porous biocarbon with good adsorption function
  • Preparation method for lamellar porous biocarbon with good adsorption function

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specific Embodiment approach 1

[0024] Embodiment 1: This embodiment is a preparation method of sheet-layer porous biochar with strong adsorption function, which is characterized in that the method is specifically completed according to the following steps:

[0025] 1. Cleaning:

[0026] Use distilled water to wash the waste biomass 3 to 5 times, then dry it in a constant temperature drying oven at a temperature of 60°C to 100°C for 2h to 8h, then crush the waste biomass and sieve to obtain biomass powder;

[0027] 2. Preparation of biochar:

[0028] Mix the biomass powder with the low-melting point molten salt containing chlorine atoms evenly to obtain the mixture; then put the mixture into the vacuum tube furnace under the protection of inert gas, and then set the vacuum tube furnace at a temperature of 5°C / min to 15°C / min The heating rate is raised to 650°C~1000°C, and then heated at 650°C~1000°C for 2h~6h, and finally the vacuum tube furnace is naturally cooled to room temperature to obtain the reaction...

specific Embodiment approach 2

[0036]Embodiment 2: This embodiment differs from Embodiment 1 in that the waste biomass described in step 1 is sawdust, crop straw, rice husk, municipal solid waste, sludge or livestock manure. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0037] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the particle size of the biomass powder in step 1 is 100 mesh to 300 mesh. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method for lamellar porous biocarbon with a good adsorption function. The objective of the invention is to overcome the problems of difficulty in degradation, proneness to migration and great harm during treatment of pesticides in water bodies in the prior art. The method comprises the following steps: 1, carrying out cleaning; and 2, uniformly mixing biomass powder with chlorine atom-containing low-melting-point molten salt, then carrying out high-temperature oxygen-limited carbonization, cleaning a calcination product and then successively carrying out grinding and sieving so as to obtain the lamellar porous biocarbon. According to the invention, when 15 mg of the lamellar porous biocarbon prepared in the invention is used for adsorbing 40 mL of an aqueous atrazine solution with an atrazine concentration of 25 to 150 mg / L, the residual amount of atrazine is less than 10% while the residual amount of atrazine in a blank control group of an aqueous atrazine solution is 80%. The preparation method provided by the invention is applicable to preparation of lamellar porous biocarbon.

Description

technical field [0001] The invention relates to a preparation method of biochar. Background technique [0002] Biochar is a porous carbonaceous solid that converts organic substances in an oxygen-limited or oxygen-free environment with stable physical and chemical properties and can remain safely in the environment for a long time. The sources of materials used to prepare biochar are extremely extensive, including crop straw, woody biomass, animal manure and solid waste, etc., and the main source is agricultural biomass with the largest storage on the earth, and the use of biomass is a kind of waste process of resourcing. The composition of biochar is mainly C, H, O, N and other elements and ash. Among them, the physical and chemical properties of charcoal are very stable, mainly composed of aromatic hydrocarbons, elemental carbon or carbon with graphite-like structure. Biochar prepared from different materials is rich in polymers and high-density carbohydrates, in additio...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01J20/28C02F1/28C02F101/36C02F101/38
CPCB01J20/20B01J20/28054C02F1/283C02F2101/36C02F2101/38
Inventor 张颖杨帆孙莉莉谢伟玲江群高岩张伟唐毅
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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