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Hydrophobic silica gel composite resin-based VOC adsorbent

A composite resin and adsorbent technology, applied in the field of environmental chemistry, can solve the problems of poor thermal stability, inability to effectively increase the adsorption capacity of low-concentration organic waste gas, and inability to apply stably for a long time, and achieve increased specific surface area and high selective adsorption. effect of ability

Active Publication Date: 2014-12-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these works have overcome some of the defects of the adsorbents to varying degrees, they have only improved the unilateral performance of the material. The organic groups with strong affinity for organic molecules have been introduced through the silane coupling agent, and the surface hydrophobicity has been improved. However, these organic groups have poor thermal stability and cannot be used stably in the adsorption-desorption process for a long time; in addition, the surface grafting of silane coupling agents has little effect on the pore structure of silica gel materials, and cannot effectively improve low-concentration organic waste gas. The amount of adsorption

Method used

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  • Hydrophobic silica gel composite resin-based VOC adsorbent
  • Hydrophobic silica gel composite resin-based VOC adsorbent
  • Hydrophobic silica gel composite resin-based VOC adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Take 5 g macroporous silica gel (the specific surface area is 119m 2 / g, pore size 20-50 nm) was washed twice with 100ml deionized water, dried at 110°C for 10 h to obtain purified silica gel; put the purified silica gel into a flask, add 200ml toluene, 30ml γ-( Methacryloyloxy)propyltrimethoxysilane, mixed and stirred in a water bath at 90 °C under the protection of nitrogen for 15 h, filtered with suction, and washed the silica gel with 100 ml of ethanol until it was white, and then dried at 110 °C for 2 h to obtain Silane-modified silica gel; take 1.6 ml of p-divinylbenzene monomer (DVB), 0.02 g of azobisisobutyrocyanide dissolved in 3.2 ml of tetrahydrofuran, stir and mix in an ice-water bath as a resin polymerization solution, and slowly add the polymerization solution dropwise Add to silane-modified silica gel, stir while adding dropwise to form wet silica gel; transfer the wet silica gel to a crystallization kettle, crystallize at 120 °C for 24 hours in a closed ...

Embodiment 2

[0033] Dissolve 3.2 ml of p-divinylbenzene monomer (DVB) and 0.02 g of azobisisobutylcyanide in 1.6 ml of tetrahydrofuran, stir and mix in an ice-water bath to form a resin polymerization solution, and the rest of the steps are the same as in Example 1. Obtained sample PDVBSiO 2 -12. Nitrogen adsorption BET test found that the specific surface area is 32 m 2 / g, the pore size is in the range of 10-30 nm, toluene (1000mg / m 3 ) adsorption capacity is only 18 mg / g. Compared with macroporous silica, PDVBSiO 2 Although -12 has strong hydrophobicity, the specific surface area has dropped significantly, indicating that excessive p-divinylbenzene polymerization modification will cause blockage of the original silica gel pores, and the polymerization of PDVB in the particle gap will cause the adsorption capacity of the sample to toluene dramatically drop.

Embodiment 3

[0035] Dissolve 2.4 ml of p-divinylbenzene monomer (DVB) and 0.02 g of azobisisobutylcyanide in 2.4 ml of tetrahydrofuran, stir and mix in an ice-water bath to form a resin polymerization solution, and the rest of the steps are the same as in Example 1. Obtained sample PDVBSiO 2 -13. Nitrogen adsorption BET test found that the specific surface area is 54 m 2 / g, the pore size is in the range of 10-20 nm, toluene (1000mg / m 3 ) adsorption capacity is only 24 mg / g. Compared with macroporous silica, PDVBSiO 2 -13 has strong hydrophobicity, but the specific surface area also drops significantly, which makes the adsorption capacity of the sample to toluene drop significantly.

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Abstract

The invention discloses a hydrophobic silica gel composite resin-based VOC adsorbent. A synthetic method for the adsorbent comprises the following steps: (1) pretreatment of silica gel; (2) silanization of the surface of the silica gel; (3) preparation of a polymer precursor of a resin and the silica gel: a step of dissolving a divinylbenzen monomer and the initiator azobisisobutyronitrile in tetrahydrofuran in an ice water bath, carrying out mixing under stirring so as to obtain a resin polymer fluid, and adding a certain amount of the resin polymer fluid in the silane-modified silica gel drop by drop to form moist silica gel; and (4) preparation of the hydrophobic silica gel composite resin-based VOC adsorbent: a step of conveying the moist silica gel prepared in step (3) to a crystallization kettle, carrying out crystallization at a temperature of 100 to 150 DEG C for 10 to 50 h so as to obtain a sample and drying the sample at a temperature of 50 to 110 DEG C for 5 to 10 h so as to obtain the adsorbent. With the synthetic method in the invention, the surface of the silica gel presents hydrophobicity, the size of a silica gel channel can be reduced, a specific surface area of the silica gel is increased, and preferential adsorption capability of the silica gel in absorption of VOC gas is greatly improved, so the hydrophobic silica gel composite resin-based VOC adsorbent has wide application prospects.

Description

(1) Technical field [0001] The invention belongs to the technical fields of environmental chemistry and material chemistry, and relates to volatile organic waste gas (VOCs) adsorption and purification technology, in particular to a polydivinylbenzene (PDVB) resin composite silica gel highly hydrophobic VOCs adsorbent. (2) Background technology [0002] The emission of volatile organic compounds (VOCs) is one of the major problems facing the environment, which has a serious impact on the natural environment and human health. Adsorption technology is one of the most widely used treatment technologies for low-concentration VOCs, and the adsorbent is the key to the technology. High-efficiency adsorbents require the characteristics of large specific surface area, high adsorption capacity, hydrophobicity, and easy regeneration. However, the commonly used activated carbon adsorbents have the disadvantages of being flammable, difficult to regenerate, and short in life. Therefore, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30B01D53/04
Inventor 卢晗锋詹德利周瑛陈银飞
Owner ZHEJIANG UNIV OF TECH
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