Method for preparing nitrogen-doped porous biochar by employing molten salt-assisted high-temperature carbonization method

A high-temperature carbonization, molten salt technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of long-residue pesticide detection rate, difficult degradation of pesticides, etc., to enhance Lewis alkalinity, promote specific adsorption, large The effect of adsorption performance

Inactive Publication Date: 2017-07-18
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nitrogen-doped porous biochar by molten salt-assisted high-t

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  • Method for preparing nitrogen-doped porous biochar by employing molten salt-assisted high-temperature carbonization method
  • Method for preparing nitrogen-doped porous biochar by employing molten salt-assisted high-temperature carbonization method
  • Method for preparing nitrogen-doped porous biochar by employing molten salt-assisted high-temperature carbonization method

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specific Embodiment approach 1

[0030] Embodiment 1: This embodiment is a method for preparing nitrogen-doped porous biochar by molten salt-assisted high-temperature carbonization, which is completed according to the following steps:

[0031] 1. Cleaning:

[0032] 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;

[0033] 2. Preparation of biochar:

[0034] Mix the biomass powder with the low-melting-point molten salt containing nitrogen atoms evenly to obtain a mixture; then put the mixture into a vacuum tube furnace under the protection of an 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 a temperature of 650°C-1000°C for 2h-6h, and finally the vacuum tube furnace is naturally cooled to room temperature to obtain the reaction product...

specific Embodiment approach 2

[0045] Embodiment 2: This embodiment differs from Embodiment 1 in that the waste biomass described in step 1 is straw, rice husk or livestock manure. Others are the same as the first embodiment.

specific Embodiment approach 3

[0046] 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. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a method for preparing nitrogen-doped porous biochar by employing a molten salt-assisted high-temperature carbonization method, relates to a preparation method of porous biochar, and aims at solving the problems that an existing residual pesticide is degradation-resistant, long in residue and high in pesticide detection rate. The method comprises the steps of (1) carrying out cleaning; and (2) mixing biomass powder with a low-melting point molten salt containing a nitrogen atom evenly, carrying out high-temperature oxygen-limiting carbonization, cleaning a calcined product, and grinding and sieving to obtain the nitrogen-doped porous biochar. The prepared nitrogen-doped porous biochar is capable of adsorbing and removing atrazine of over 48% within 18h. The method is suitable for preparation of the nitrogen-doped porous biochar.

Description

technical field [0001] The invention relates to a preparation method of porous biochar. Background technique [0002] Biochar refers to a carbon-rich substance formed by anoxic pyrolysis of animal and plant residues. It contains a porous and highly aromatic structure and exhibits strong adsorption capacity for various pollutants. Biochar, as a new multifunctional material, has rapidly become a research hotspot due to its good potential in many aspects such as biomass resource utilization, climate change mitigation, new energy supply, and pollutant adsorption. Biochar has a larger specific surface area and more pores, and is rich in organic carbon and mineral nutrients. As a soil conditioner, it can increase soil fertility and increase crop yield. Every year, a large amount of solid waste is produced in the process of agricultural and forestry production in our country, such as straw, dead branches and leaves, livestock manure, etc. If they are not disposed of effectively, ...

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Application Information

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IPC IPC(8): B01J20/20B01J20/30
CPCB01J20/0259B01J20/04B01J20/046B01J20/20B01J2220/4806B01J2220/4825
Inventor 张颖杨帆孙莉莉高岩张伟谢伟玲唐毅
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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