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A kind of hydrophobic graphdiyne composite iron-containing mof adsorbent and preparation method thereof

A technology of graphyne and adsorbent, which is applied in the field of preparation of highly hydrophobic graphyne composite adsorbent, which can solve the problems of reducing the adsorption of VOCs by MOFs and the collapse of MOFs skeleton, and achieve the effect of improving moisture resistance and hydrophobicity

Active Publication Date: 2022-05-20
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The higher the concentration of water vapor, the more water molecules will be adsorbed into the pores of MOFs, thereby reducing the ability of MOFs to adsorb VOCs.
In addition, after too many water molecules coordinate with the metal, it is possible to dissociate the coordination bond between the metal and the ligand in the MOFs secondary unit structure through competitive coordination, resulting in the collapse of the MOFs skeleton.

Method used

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  • A kind of hydrophobic graphdiyne composite iron-containing mof adsorbent and preparation method thereof
  • A kind of hydrophobic graphdiyne composite iron-containing mof adsorbent and preparation method thereof
  • A kind of hydrophobic graphdiyne composite iron-containing mof adsorbent and preparation method thereof

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Embodiment 1

[0039] A preparation method of a hydrophobic graphyne composite iron-containing MOF adsorbent, comprising the steps of,

[0040] (1) Preparation of MOF(Fe) seed crystals: first, ultrasonically disperse 1.0mmoL trimesic acid and 1.0mmoL ferric nitrate nonahydrate in an aqueous solution, and then place them in a stirrer to stir, (ferric nitrate nonahydrate and trimesis The molar ratio of acid is (1:1)). The solution was then put into a high-pressure reactor and placed in a programmed oven, and the temperature was raised to 150° C. at a rate of 10° C. / min for another 24 hours. The obtained MOF(Fe) material is ground to a particle size of <1.0 μm. Recorded as MOF(Fe) seed crystal.

[0041] (2) Preparation of MOF(Fe) seed crystal Pickering emulsion: first, place the ground MOF(Fe) seed crystal in the aqueous solution to obtain solution A: the input quality of the MOF(Fe) seed crystal is 2 mg, and the aqueous solution The total volume is 20mL; configure copper acetate aqueous sol...

Embodiment 2

[0045] A preparation method of a hydrophobic graphyne composite iron-containing MOF adsorbent, comprising the steps of,

[0046] (1) Preparation of MOF(Fe) seed crystals: first, ultrasonically disperse 1.0mmoL trimesic acid and 1.78mmoL ferric nitrate nonahydrate in aqueous solution, and then place them in a stirrer to stir, (ferric nitrate nonahydrate and tribenzene The molar ratio of the triacids is 1:1.78). The solution was then put into a high-pressure reactor and placed in a programmed oven, and the temperature was raised to 150° C. at a rate of 2° C. / min for another 24 hours. The obtained MOF(Fe) material is ground to a particle size of <1.0 μm. Recorded as MOF(Fe) seed crystal.

[0047] (2) Preparation of MOF(Fe) seed crystal Pickering emulsion: first, place the ground MOF(Fe) seed crystal in the aqueous solution to obtain solution A: the input quality of the MOF(Fe) seed crystal is 100mg, and the aqueous solution The total volume is 100mL; configure copper acetate a...

Embodiment 3

[0051] A preparation method of a hydrophobic graphyne composite iron-containing MOF adsorbent, comprising the steps of,

[0052] (1) Preparation of MOF(Fe) seed crystals: First, 1.0mmoL trimesic acid and 1.6mmoL ferric nitrate nonahydrate were ultrasonically dispersed in an aqueous solution (the molar ratio of ferric nitrate nonahydrate to trimesic acid was 1:1.6) , and then stirred in a blender. Then put the solution into a high-pressure reactor and place it in a programmed oven, and raise the temperature to 100° C. at a rate of 2° C. / min and keep the reaction for 20 hours. The obtained MOF(Fe) material is ground to a particle size of <1.0 μm. Recorded as MOF(Fe) seed crystal.

[0053] (2) Preparation of MOF(Fe) seed crystal Pickering emulsion: first put the ground MOF(Fe) seed crystal into the aqueous solution to obtain solution A: the input quality of the MOF(Fe) seed crystal is 70mg, and the aqueous solution The total volume is 80mL; configure copper acetate aqueous sol...

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Abstract

The invention discloses a hydrophobic graphyne composite iron-containing MOF adsorbent and a preparation method thereof. In this method, MOF(Fe) is first ground into small seed crystals, and dispersed in copper acetate aqueous solution using ultrasound; then dichloromethane is added to the above solution, and Pickering emulsion is prepared by high-speed stirring; then hexaacetylene Dissolve benzene in a certain amount of dichloromethane, add it to the above-mentioned Pickering emulsion, let graphyne grow on the interface of the emulsion containing Cu catalytic sites, remove the organic phase after heating in a water bath, and separate the graphite by centrifugation Alkyne composite seed crystal MOF(Fe), and finally placed it in ferric nitrate nonahydrate and trimesic acid for secondary hydrothermal growth of MOF(Fe) crystals, and obtained highly hydrophobic graphyne composite MOF(Fe) adsorbent. The present invention controls the stability of the Pickering emulsion by controlling the addition amount of MOF (Fe) and the ratio between the water phase and the oil phase, thereby affecting the effect between the graphyne and the MOF (Fe) seed crystal, affecting the MOF (Fe) ) growth, effectively improving the hydrophobicity of the final adsorbent and the preferential adsorption of hydrocarbon VOCs.

Description

technical field [0001] The invention belongs to the field of novel functional materials, and in particular relates to the preparation of a highly hydrophobic graphyne composite adsorbent. Background technique [0002] Metal-organic framework materials (MOFs) have become a new type of porous adsorption material that has attracted the most attention at home and abroad in the past two decades due to their huge specific surface area and adjustable pore structure, and have continuously refreshed the adsorption capacity of several typical VOCs. highest record. Relevant research reports show that MOFs materials will have great development potential and application prospects in the field of VOCs pollution control in the future. However, in recent years, researchers have found that in many laboratories, MOFs materials with strong adsorption capacity for VOCs, once they encounter a high-humidity environment (relative humidity greater than 50%), their adsorption capacity will drop sha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/22B01J20/28B01D53/02
CPCB01J20/226B01J20/20B01J20/28014B01D53/02B01D2257/708B01D2257/702B01D2253/102B01D2253/204Y02A50/20
Inventor 赵祯霞张正生王睿猛赵钟兴
Owner GUANGXI UNIV
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