Hierarchical porous carbon block material for formaldehyde purification and preparation method and application thereof

A formaldehyde purification and hierarchical pore technology, applied in the field of materials, can solve the problems that hinder the performance improvement and application expansion of porous carbon materials, unfriendly environment, complicated process, etc., and achieve efficient pore structure control methods, simple recycling and processing, and simple preparation routes Effect

Inactive Publication Date: 2018-03-16
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are four major problems to be solved urgently in the application of porous carbon materials in the purification of formaldehyde: (1) usually in the form of powder, when used to separate the adsorbent and the adsorption medium, it must go through tedious filtration or centrifugation, and it is difficult to obtain large-scale Application and promotion; (2) Existing porous carbon-based adsorbents generally need to add a large amount of binder in the molding production process, which reduces the specific surface area of ​​the adsorbent, greatly reduces the adsorption active sites, and leads to the purification of f

Method used

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  • Hierarchical porous carbon block material for formaldehyde purification and preparation method and application thereof
  • Hierarchical porous carbon block material for formaldehyde purification and preparation method and application thereof
  • Hierarchical porous carbon block material for formaldehyde purification and preparation method and application thereof

Examples

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Example Embodiment

[0028] Example 1

[0029] A preparation method of hierarchical porous basswood-based carbon block material for formaldehyde purification, including the following steps:

[0030] (1) Dry the basswood to constant weight;

[0031] (2) Carbonize and activate the wood block in step (1): ①Under the protection of 300mL / min nitrogen, increase from room temperature to 900℃ at a rate of 5℃ / min, and keep it for 1.5h; ②Inlet flow 150mL / min CO 2 The gas is activated for 2h; ③Stop the introduction of CO 2 The gas is continuously blown with nitrogen and cooled to room temperature to obtain a layered pore linden wood-based carbon block material for formaldehyde purification.

[0032] The BET specific surface area of ​​the hierarchical porous basswood-based carbon block material prepared for formaldehyde purification was tested by the ASAP2020 adsorber nitrogen adsorption method produced by Micromeritics, USA 2 / g, Langmuir specific surface area is 1591m 2 / g; pore volume is 1.06cm 3 / g. Scanning ele...

Example Embodiment

[0034] Example 2

[0035] A preparation method of hierarchical porous basswood-based carbon block material for formaldehyde purification, including the following steps:

[0036] (1) Dry the basswood to constant weight;

[0037] (2) Carbonize and activate the wood block in step (1): ①Under the protection of 300mL / min nitrogen, increase from room temperature to 900℃ at a rate of 5℃ / min, and keep it for 1.5h; ②Inlet flow 150mL / min CO 2 Gas activation for 0.5h; ③Stop CO 2 The gas is continuously blown with nitrogen and cooled to room temperature to obtain a layered pore linden wood-based carbon block material for formaldehyde purification.

[0038] The BET specific surface area of ​​the hierarchical porous linden wood-based carbon block material prepared for formaldehyde purification was tested with the nitrogen adsorption method of the ASAP2020 adsorber produced by the American Micromeritics company. The BET specific surface area was 991m. 2 / g, Langmuir specific surface area is 1364m 2 ...

Example Embodiment

[0040] Example 3

[0041] A preparation method of hierarchical porous basswood-based carbon block material for formaldehyde purification, including the following steps:

[0042] (1) Dry the basswood to constant weight;

[0043] (2) Carbonize and activate the wood block in step (1): ①Under the protection of 300mL / min nitrogen, increase from room temperature to 900℃ at a rate of 5℃ / min, and keep it for 1.5h; ②Inlet flow 150mL / min CO 2 The gas is activated for 1h; ③Stop the introduction of CO 2 The gas is continuously blown with nitrogen and cooled to room temperature to obtain a layered pore linden wood-based carbon block material for formaldehyde purification.

[0044] The BET specific surface area of ​​the hierarchical porous linden wood-based carbon block material prepared for formaldehyde purification was tested by the ASAP2020 adsorber nitrogen adsorption method produced by the American Micromeritics Company, which was 919m. 2 / g, Langmuir specific surface area is 1268m 2 / g; pore ...

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Abstract

The invention discloses a hierarchical porous carbon block material for formaldehyde purification and a preparation method and application thereof. The preparation method includes: drying a wood material with a quasi-ordered tunnel shaped biological biomorphic structure, directly carbonizing and activating in a certain gas atmosphere to obtain the hierarchical porous carbon block material high inspecific surface area. The process is simple, the obtained carbon block material has a unique hierarchical distribution porous structure and is in a blocky structure macroscopically, great in mechanical performance and flexible and convenient to cut, BET specific surface area is 726-1107m<2>/g, Langmuir specific surface area reaches 974-1591m<2>/g, and pore volume is 0.36-1.07cm<3>/g. Processes ofefficient adsorption, separation and the like can be completed by placing the carbon block material in a space contaminated by formaldehyde gas for a period of time and then taking away.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a layered porous carbon block material used for formaldehyde purification and its preparation method and application. Background technique [0002] With the improvement of economic level, people's awareness of environmental protection is getting stronger and stronger, and they pay more and more attention to air quality, especially indoor air quality. In recent years, due to people's pursuit of more refined and high-end interior decoration, indoor air pollution has intensified, and formaldehyde has become the primary indoor pollutant because of its wide range of pollution sources and difficult removal. [0003] Formaldehyde is the simplest aldehyde substance, which has the functions of antisepsis and disinfection. It is mainly used in the production of plastics, rubber, plywood and adhesives, and is widely used in leather, textile, pharmaceutical and other industries...

Claims

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Application Information

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IPC IPC(8): C01B32/324C01B32/336B01D53/02B01J20/20B01J20/30
CPCB01D53/02B01D2257/70B01D2258/06B01J20/20C01P2006/12C01P2006/14
Inventor 梁业如张伟财曾凡军刘应亮
Owner SOUTH CHINA AGRI UNIV
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