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Preparing and regenerating methods of hydrophobic coating activated carbon capable of improving adsorption to water-containing organic gas

A technology of gas adsorption and activated carbon, which is applied in the field of environmental pollutant treatment, can solve the problems of weakening the adsorption of activated carbon and weakening the adsorption of target substances, and achieve the effects of increasing adsorption capacity, simple preparation and regeneration methods, and easy operation and promotion.

Inactive Publication Date: 2016-07-27
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

However, when the hydrophobic surface of activated carbon is formed, the pore structure and other characteristics will also change. While the hydrophobicity of the adsorbent is enhanced, the adsorption of the target will also be weakened, which will inevitably weaken the adsorption of activated carbon to VOCs containing water vapor.

Method used

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  • Preparing and regenerating methods of hydrophobic coating activated carbon capable of improving adsorption to water-containing organic gas
  • Preparing and regenerating methods of hydrophobic coating activated carbon capable of improving adsorption to water-containing organic gas
  • Preparing and regenerating methods of hydrophobic coating activated carbon capable of improving adsorption to water-containing organic gas

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Effect test

Embodiment 1

[0026] Embodiment 1 activated carbon modification and modified activated carbon characterization

[0027] The present embodiment provides the preparation method of hydrophobic modified activated carbon of the present invention, and its steps are as follows:

[0028] Step 1: Take 200ml of the prepared PDMS and put it into a stainless steel container, and place a wire mesh (aperture about 200 mesh) at 5cm above the liquid surface.

[0029] Step 2: Weigh 2.00g of activated carbon that has been pretreated (heated at 250°C for one hour) and evenly spread it on the surface of the wire mesh.

[0030] Step 3: After sealing the stainless steel container, put it into a muffle furnace for heating, heat at 250°C for 1 hour, seal it at room temperature and cool naturally to obtain hydrophobic modified activated carbon.

[0031] The results of characterization of activated carbon by BET, Boehm titration and other methods are listed in Table 1.

[0032] Table 1 Physical and chemical charac...

Embodiment 2

[0034] Embodiment 2. Modified active carbon is to toluene, the saturated adsorption of benzene

[0035] Table 2 lists the equilibrium adsorption capacity and equilibrium water vapor adsorption capacity of modified activated carbon for adsorption of aqueous VOCs. It shows the selective adsorption capacity of modified activated carbon to toluene and benzene molecules in the presence of water vapor.

[0036] Table 2 Equilibrium adsorption capacity and equilibrium water vapor adsorption capacity of modified activated carbon for adsorption of water-containing VOCs

[0037]

Embodiment 3

[0038] Embodiment 3 modified activated carbon regeneration

[0039] Take about 2.0g of VOCs (toluene, benzene) adsorption saturated activated carbon (activated carbon before modification and modified activated carbon in Example 1), spread evenly on the aluminum foil paper, and put it into the tube furnace. Nitrogen gas was introduced into the tube furnace at room temperature, and after the nitrogen gas filled the tube furnace, the tube furnace was turned on, the temperature was adjusted to 200°C, and nitrogen protection was continuously supplied, and heated for 8 hours. The adsorption breakthrough curve of regenerated activated carbon for benzene vapor is as follows: figure 1Shown; The equilibrium adsorption capacity of water vapor and benzene vapor of regenerated activated carbon is listed in Table 3. Adsorption of water-containing benzene vapor saturated modified activated carbon (unmodified) after regeneration, the benzene vapor adsorption capacity decreased very little. ...

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Abstract

The invention discloses preparing and regenerating methods of hydrophobic coating activated carbon capable of improving adsorption to water-containing organic gas. The preparation method comprises the steps that 1, activated carbon is cleaned and dried for use; 2, a cross-linking reaction is conducted through heating and condensing methods, a hydrophobic polymer material is loaded on the cleaned and dried activated carbon, and the hydrophobic coating activated carbon is obtained. The regenerating method comprises the step that after the hydrophobic coating activated carbon is used for adsorbing the water-containing organic gas, regenerated activated carbon is obtained through a heating method under the protection of inert gas. The preparing and regenerating methods of the hydrophobic coating activated carbon are simple, needed equipment is simple, the prepared hydrophobic coating activated carbon can significantly improve adsorption to the water-containing organic gas, and the adsorption capacity of the regenerated activated carbon to the water-containing organic gas is not obviously reduced.

Description

technical field [0001] The invention mainly relates to the technical field of environmental pollutant treatment, in particular to the removal of gaseous environmental pollutants, and more specifically, the invention relates to the preparation and regeneration of a hydrophobic modified activated carbon adsorption material. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) refer to organic compounds with saturated vapor pressure greater than 70Pa at normal temperature and boiling point less than 260°C at normal pressure, mainly including hydrocarbons, aromatic hydrocarbons, ketones, acids, alcohols, lipids, amines Catalysts and organic acids are a common type of gaseous environmental pollutants. VOCs pollution in the environment mainly comes from the use of industrial activities that lead to VOCs pollution in the atmosphere, soil, and even groundwater. VOCs pollution has potential hazards to the ecological environment and human health,...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/34B01D53/02
CPCB01J20/262B01D53/02B01D2257/708B01J20/20B01J20/261B01J20/3458
Inventor 薛南冬杨兵刘寒冰
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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