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Phenyl loaded KIT-6 mesoporous silicon material as well as preparation method and application thereof

A KIT-6, mesoporous silicon technology, applied in other chemical processes, chemical instruments and methods, separation methods, etc., can solve problems such as clogging, and achieve the effect of high hydrophobicity and high VOCs adsorption capacity

Inactive Publication Date: 2017-12-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some researchers have grafted phenyl groups on the surface of various mesoporous silicon through the post-grafting method. Excessive phenyl groups are likely to cause blockage in the pores, so the limitation of the number of grafted phenyl groups is also the limitation to improve the adsorption performance of the material.

Method used

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  • Phenyl loaded KIT-6 mesoporous silicon material as well as preparation method and application thereof
  • Phenyl loaded KIT-6 mesoporous silicon material as well as preparation method and application thereof
  • Phenyl loaded KIT-6 mesoporous silicon material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 4g of block copolymer P123 and 3.7g of hydrochloric acid (37wt%) into 72mL of deionized water, stir for 3h, then add 4g of n-butanol, and stir for 1h at a temperature of 35°C; 1.40g of phenyltriethoxysilane Add 7.29g of tetraethyl orthosilicate into 72mL of deionized water, then add 3.7g of hydrochloric acid (37wt%), and stir at a temperature of 35°C for 3h; After stirring for 20 hours at a temperature of ℃, put it into a stainless steel reactor lined with polytetrafluoroethylene, carry out a hydrothermal reaction at 100℃ for 24 hours, only filter without cleaning, and obtain a white precipitate; place the obtained precipitate in In an oven at 160°C for 5 hours, a white powder was obtained, washed twice at 40°C with 150mL ethanol solution of hydrochloric acid (containing 5mL hydrochloric acid (37wt%)), then washed with deionized water, filtered, and dried to obtain benzene The base-loaded KIT-6 mesoporous silicon material is denoted as (1:6)KIT-6.

[0031] From fi...

Embodiment 2

[0033] The difference from Example 1 is that the mass of phenyltriethoxysilane and ethyl orthosilicate added are respectively changed to 0.75g and 7.85g, and the rest of the process remains unchanged. The obtained phenyl-supported KIT-6 mesoporous silicon material is denoted as (1:12)KIT-6.

[0034] The specific surface area of ​​the adsorbent is 838.4m 2 / g, the pore volume is 0.606cm 3 / g, the pore diameter is 5.086nm. The test conditions for its toluene adsorption are: the atmosphere is a nitrogen flow containing 1000ppm toluene concentration at 100mL / min, the space velocity is 60000mL / (gh), the temperature is 25°C, and the relative humidity of the water-containing adsorption process is 60%. The performance results are shown in the figure Figure 4 As shown, the toluene adsorption capacity under the dry condition is 2.01mmol / g, the toluene adsorption capacity under the RH=60% condition is 1.16mmol / g, and the hydrophobicity value (the ratio of the toluene adsorption amoun...

Embodiment 3

[0036] The difference from Example 1 is that the added mass of phenyltriethoxysilane and ethyl orthosilicate is changed to 0.52g and 8.05g respectively, and the rest of the process remains unchanged. The obtained phenyl-supported KIT-6 mesoporous silicon material is denoted as (1:18)KIT-6.

[0037] The specific surface area of ​​the adsorbent is 842.0m 2 / g, the pore volume is 0.841cm 3 / g, the pore diameter is 6.317nm. The test conditions for its toluene adsorption are: the atmosphere is a nitrogen flow containing 1000ppm toluene concentration at 100mL / min, the space velocity is 60000mL / (gh), the temperature is 25°C, and the relative humidity of the water-containing adsorption process is 60%. The performance results are shown in the figure Figure 4As shown, the toluene adsorption capacity under the dry condition is 1.85mmol / g, the toluene adsorption capacity under the RH=60% condition is 0.98mmol / g, and the hydrophobicity value (toluene adsorption ratio under the moisture...

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Abstract

The invention discloses a phenyl loaded KIT-6 mesoporous silicon material as well as a preparation method and application thereof. The preparation method comprises the following steps: taking P123 as a template agent, adding ethyl orthosilicate and a phenyl-containing organic silicon source, and carrying out hydrolysis-copolycondensation reaction under an acid condition through hydrothermal reaction, thus preparing the phenyl loaded KIT-6 mesoporous silicon material. The phenyl loaded KIT-6 mesoporous silicon material disclosed by the invention has high specific surface area and high pore volume; compared with pure KIT-6, the VOCs (Volatile Organic Compounds) adsorption capacity (1.44mmol g<-1>) and the hydrophobicity (Qwet / Qdry is equal to 77.8 percent) of phenyl loaded KIT-6 under a high-humidity condition are both remarkably increased, so that an adsorption material has a great application potential in the fields of chemical engineering, environment protection and the like.

Description

technical field [0001] The invention belongs to the technical field of organic-inorganic composite porous materials, adsorption materials and preparation thereof, and relates to the adsorption and purification of benzene-based VOCs under dry or high-humidity conditions in chemical and environmental protection industries, in particular to a preparation method of KIT-6 mesoporous silicon and Application in adsorption of VOCs. Background technique [0002] Anthropogenic volatile organic compounds (VOCs) in the atmosphere mainly come from industries such as petrochemical, oil transportation, printing and building materials decoration, which can be directly inhaled by the human body, and can be directly inhaled by the human body, as well as NO x A photochemical reaction occurs to form secondary aerosols and O 3 , seriously endangering the living environment of human beings, so the treatment of VOCs is one of the most important research hotspots in the field of environmental prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2257/70B01D2257/708B01J20/10B01J20/22B01J20/28083Y02A50/20
Inventor 李俊华刘帅彭悦陈建军胡方云
Owner TSINGHUA UNIV