Carbon-silicon composite adsorbent and application

A technology of carbon-silicon composite and adsorbent, which is applied in the field of environmental chemistry and material chemistry, can solve the problems that cannot be applied to the adsorption of volatile organic waste gas, and achieve good heat resistance, easy desorption, and high selective adsorption capacity , to avoid the effect of unsafe factors

Active Publication Date: 2018-07-06
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of silica gel has a large number of hydroxyl groups and has strong hydrophilic properties, so it cannot be used in the adsorption of volatile organic waste gas.

Method used

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  • Carbon-silicon composite adsorbent and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 100g of B-type silica gel for pretreatment: wash it with 150ml of ethanol, and dry it in an oven at 110°C for 8h for later use. Soak the pretreated silica gel in 200ml analytical ethanol, add 10% (the ethanol volume is 100%, that is, 20ml) KH-570, condense and reflux at 85°C for 12h, then filter and dry at 110°C to evaporate the ethanol After 24 hours, the silanized silica gel was obtained and stored for future use. Take 3g of sucrose and dissolve it in 12ml of deionized water, stir well to form a 20wt% solution. Put 8g of silanized silica gel into the prepared 20wt% solution, soak it for 8 hours, filter it with a Buchner funnel, put it into a polytetrafluoroethylene liner, put it into a stainless steel reactor, and heat it in water at 180°C for 18 hours. Then cool naturally, wash the hydroheated silica gel several times with deionized water until the charcoal is removed, and dry in an oven at 110°C for 2 hours. Carry out the last step of charcoal burning: placed...

Embodiment 2

[0036] 8 g of sucrose was dissolved in 12 ml of deionized water to form a 40 wt % solution. The rest of the steps are the same as in Example 1 to obtain the sample Sucr-C@Si-0.4. Compared with the original silica gel, the hydrophobicity of this sample has been improved to a certain extent. Compared with the silica gel with a concentration of 20%, the adsorption capacity is significantly increased, indicating that the concentration of the prepared solution has a significant impact on the adsorption capacity.

Embodiment 3

[0038] Get 8g of sucrose and dissolve in 8ml of deionized water to make a 50wt% solution. All other steps are the same as in Example 1 to obtain the product Sucr-C@Si-0.5. Compared with the original silica gel, its p-toluene (5000mg / m 3 ) with a saturated adsorption capacity of 86.4 mg / g and a breakthrough time of 225 min. It shows that there is rich carbon content in the channel, and the effect is remarkable.

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Abstract

The invention discloses a brand-new silica gel and carbon material-compounded VOCs (Volatile Organic Compounds) adsorption material and application thereof to adsorption of VOCs. According to the adsorbent, rigid porous silica gel with high specific surface area is used as a bone glue material, and a macromolecular polymer and a biomass are used as carbon sources; the bone glue material and the carbon sources are introduced into a silica gel channel, and polymerization and high-temperature carbonization are initiated under a hydrothermal environment. Therefore, the brand-new carbon-silicon composite adsorption material is obtained. The adsorbent has hydrophobicity and high-selectivity adsorption capacity for organic molecules, is extremely high in heat resistance and excellent in desorption property, can be applied to a high-concentration organic waste gas recycling technology in the industry, and can also be applied to a VOCs rotating wheel adsorption device and indoor organic waste gas purification.

Description

(1) Technical field [0001] The invention belongs to the technical fields of environmental chemistry and material chemistry, and relates to adsorption and purification treatment of volatile organic matter, in particular to a carbon-based and silicon-based composite adsorption material. (2) Background technology [0002] In recent years, volatile organic compounds have become more and more prominent in environmental pollution control, and the adsorption method has attracted more and more attention due to its advantages of simple operation, safety, and simple equipment. Adsorbent is the core part of the adsorption method. Adsorbents with excellent performance usually exhibit high specific surface area, large adsorption capacity, superhydrophobicity, and excellent regeneration performance. Activated carbon is one of the most common types of adsorbents. Activated carbon is widely used in actual production due to its large specific surface area, strong adsorption capacity, and low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01D53/02B01D53/06
CPCB01D53/02B01D53/06B01D2257/70B01D2257/708B01J20/103B01J20/20Y02A50/20
Inventor 卢晗锋陆筱艾周瑛周炳刘硕朱秋莲刘华彦张泽凯
Owner ZHEJIANG UNIV OF TECH
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