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Hierarchical pore carbon material and preparation method and application thereof

A technology of graded pore carbon and channels, applied in the field of porous materials, can solve the problems of secondary pollution, severe toxicity, carcinogenicity, etc., and achieve the effect of high removal rate

Inactive Publication Date: 2020-09-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most VOCs are highly toxic, irritating, and even carcinogenic, and are prone to photochemical reactions with nitrogen oxides to form photochemical smog, causing secondary pollution

Method used

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  • Hierarchical pore carbon material and preparation method and application thereof
  • Hierarchical pore carbon material and preparation method and application thereof
  • Hierarchical pore carbon material and preparation method and application thereof

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Experimental program
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preparation example Construction

[0028] The present invention also provides a method for preparing the hierarchically porous carbon material described in the above technical solution, comprising the following steps:

[0029] (1) After mixing straw and nanometer calcium carbonate, carry out tabletting treatment, obtain tabletting;

[0030] (2) performing anaerobic pyrolysis on the compressed tablet to obtain a pyrolysis product;

[0031] (3) After mixing and reacting the pyrolysis product with hydrochloric acid, filter and dry in sequence to obtain a hierarchical porous carbon material.

[0032] In the invention, the straw and the nano-calcium carbonate are mixed and then subjected to tableting treatment to obtain compressed tablets. In the present invention, the straw preferably includes one or more of rice straw, tobacco straw, corn straw, wheat straw, millet straw and black soybean straw. In the present invention, the straw is easy to form functional groups, and the straw The particle size is preferably 1...

Embodiment 1

[0045] Weigh 10 g of rice straw with a mesh size of 100 to 300, wash with 500 mL of deionized water, filter, and dry at 80° C. for 12 hours in a blast drying oven. The above product was mixed with 20 g of nano-calcium carbonate (particle size: 20 nm) and put into a ball mill, and ground and dispersed for 1 h at 1500 rpm. And the sample is compressed into tablets by a tablet press, the pressure is 20Mpa, each tablet is 2g, 10 tablets in total. 10 pellets were put into a tube furnace for anaerobic pyrolysis at a nitrogen flow rate of 2 mL / min at a heating rate of 10 °C / min, firstly carbonized at 400 °C for 1 h, and then activated at 800 °C for 2 h. The obtained pyrolysis product was put into 5 mol / L hydrochloric acid solution, stirred with a magnetic stirrer for 6 hours, and then filtered under a vacuum filter, and finally the product was dried in a blast drying oven at 105°C for 24 hours.

[0046] The hierarchical porous carbon material that embodiment 1 prepares is carried ou...

Embodiment 2

[0057] Weigh 10 g of rice straw with a mesh size of 100-300, wash with 500 mL of deionized water, filter, and dry at 80° C. for 12 h in a blast drying oven. The above product was mixed with 10 g of nano-calcium carbonate (particle size: 20 nm), then put into a ball mill, and ground and dispersed for 1 h at 1500 rpm. And the sample is compressed into tablets by a tablet press, the pressure is 20Mpa, each tablet is 2g, 10 tablets in total. 10 pellets were put into a tube furnace for anaerobic pyrolysis at a nitrogen flow rate of 2 mL / min at a heating rate of 10 °C / min, firstly carbonized at 400 °C for 1 h, and then activated at 800 °C for 2 h. The obtained pyrolysis product was put into 5 mol / L hydrochloric acid solution, stirred with a magnetic stirrer for 6 hours, and then filtered under a vacuum filter, and finally the product was dried in a blast drying oven at 105°C for 24 hours.

[0058] Scanning electron microscope analysis and transmission electron microscope analysis w...

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Abstract

The invention provides a hierarchical pore carbon material as well as a preparation method and an application thereof, and belongs to the field of porous materials. The hierarchical porous carbon material provided by the invention comprises micropores, mesopores and macropores, chlorine ions are loaded on the outer surface of the hierarchical pore carbon material and the surfaces of pore channels,and the outer surface of the hierarchical pore carbon material and the surfaces of the pore channels further contain carbon-oxygen functional groups. The hierarchical pore carbon material provided bythe invention is used as an adsorbent and can adsorb mercury vapor, arsenic vapor, selenium vapor and volatile organic pollutants. The results of embodiments show that the hierarchical pore carbon material provided by the invention can effectively adsorb elemental mercury vapor, VOCs (represented by benzene vapor and o-xylene vapor), arsenic vapor and selenium vapor.

Description

technical field [0001] The invention relates to the field of porous materials, in particular to a hierarchical porous carbon material and its preparation method and application. Background technique [0002] Due to its persistence, long-distance migration and bioaccumulation, heavy metal mercury has become one of the important metal pollutants that endanger the ecological environment and even the human nervous system. According to statistics, large-scale coal-burning activities have become the largest source of man-made mercury pollution emissions. It is of great significance to develop efficient mercury removal technologies for coal-fired flue gas. Mercury in coal combustion flue gas mainly exists in three forms: oxidized mercury, particulate mercury and elemental mercury. Among them, both oxidized mercury and particulate mercury can be removed by dust collector equipment, while elemental mercury is difficult to be efficiently removed by conventional pollution control equi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/02
CPCB01J20/20B01J20/28054B01J20/30B01D53/02B01J20/28083B01J20/28085B01D2253/102B01D2257/708B01D2257/602B01D2257/7027
Inventor 张笑石其其沈伯雄王玉亭
Owner HEBEI UNIV OF TECH
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