Preparation method of oil adsorption material with hierarchical porous structure

An oil-absorbing material, multi-level pore technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as the collapse of aerogel oil-absorbing structure, achieve excellent hydrophobicity and lipophilicity, and solve low adsorption capacity and high adsorption capacity Effect

Active Publication Date: 2018-03-30
霖晓(天津)科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of the prior art, the present invention uses bacterial cellulose and siloxane as raw materials, uses bacterial cellulose as a skeleton to solve the problem of structural collapse in the airgel oil absorption process, and uses methyltriethoxysilane as a silicon source to prepare oxidized Silica airgel is filled into bacterial cellulose airgel to provide hydrophobic groups and high porosity to prepare composites with excellent oil absorption properties

Method used

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  • Preparation method of oil adsorption material with hierarchical porous structure
  • Preparation method of oil adsorption material with hierarchical porous structure
  • Preparation method of oil adsorption material with hierarchical porous structure

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Embodiment 1

[0035]A method for preparing an oil-absorbing material with a hierarchical porous structure, the molar ratio of methyltriethoxysilane: water: nitric acid: ethanol = 1:2:0.06:6.8, and the silica concentration in the obtained silica sol is 0.25mol / L, the bacterial cellulose airgel drying medium is water, and the composite drying medium is tert-butanol. Follow the steps in order:

[0036] (1) Preparation of bacterial cellulose airgel

[0037] 5 g of bacterial cellulose with a moisture content of 75 wt % was placed in 200 ml of water to be mechanically sheared by a shearing machine, and the rotational speed of the shearing machine was 1000 rpm. The obtained bacterial cellulose hydrosol with a density of 6 mg / ml was placed in a beaker and freeze-dried for 24 hours to obtain a bacterial cellulose aerogel with a density of 30 mg / ml;

[0038] (2) Preparation of silica sol

[0039] At a temperature of 20°C, dissolve 1.66g of methyltriethoxysilane in 314g of ethanol and prepare an a...

Embodiment 2

[0049] A method for preparing an oil-absorbing material with a hierarchical porous structure, the molar ratio of methyltriethoxysilane:water:nitric acid:ethanol=1:3:0.12:4.7, and the silicon oxide concentration in the obtained silica sol is 0.35mol / L, the bacterial cellulose airgel drying medium is water, and the composite drying medium is tert-butanol. Follow the steps in order:

[0050] (1) Preparation of bacterial cellulose airgel

[0051] The bacterial cellulose with a moisture content of 5 g and a moisture content of 78 wt % was placed in 300 ml of water for mechanical shearing by a shearing machine, and the rotational speed of the shearing machine was 2000 rpm. The obtained bacterial cellulose hydrosol with a density of 4 mg / ml was placed in a beaker and freeze-dried for 36 hours to obtain a bacterial cellulose aerogel with a density of 20 mg / ml;

[0052] (2) Preparation of silica sol

[0053] At a temperature of 4°C, dissolve 1.66g of methyltriethoxysilane in 218.4g...

Embodiment 3

[0062] A method for preparing an oil-absorbing material with a hierarchical porous structure, the molar ratio of methyltriethoxysilane: water: nitric acid: ethanol = 1: 2.5: 0.08: 3.3, and the silicon oxide concentration in the obtained silica sol is 0.5 mol / L, the bacterial cellulose airgel drying medium is water, and the composite drying medium is tert-butanol. Follow the steps in order:

[0063] (1) Preparation of bacterial cellulose airgel

[0064] 5 g of bacterial cellulose with a moisture content of 80 wt % was placed in 300 ml of water to be mechanically sheared by a shearing machine, and the rotational speed of the shearing machine was 3000 rpm. The obtained bacterial cellulose hydrosol with a density of 4 mg / ml was placed in a beaker for 48 hours of freeze-drying to obtain a bacterial cellulose aerogel with a density of 20 mg / ml;

[0065] (2) Preparation of silica sol

[0066] At a temperature of 40°C, dissolve 1.66g of methyltriethoxysilane in 152g of ethanol and...

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Abstract

The invention relates to a preparation method of an oil adsorption material with a hierarchical porous structure. The preparation method comprises the steps: firstly, preparing low-density bacterial cellulose aerogel by self-assembly by using mechanical stirring and freeze-drying processes; then, compounding the low-density bacterial cellulose aerogel with silica gel in a vacuum state, wherein thesilica gel takes siloxane with methyl groups as a precursor; and preparing the super-elastic, super-hydrophobic and super-oleophilic oil adsorption material with the hierarchical porous structure byusing a freeze-drying process. The maximum elastic deformation of the oil adsorption material can reach 40%-80%, and the oil adsorption material can be restored to the original size after pressure relief. Meanwhile, the oil adsorption material has the contact angle of 145-152 DEG, has relatively high adsorption capacity to various organic matters and oil stains and has the adsorption quality factor ranging from 8 to 11. Due to the super-elasticity and excellent oil adsorption performance, the composite can also effectively recycle the adsorbed oil, and the maximum recycling quantity reaches to80%-90%. The technical problems such as low adsorption quantity, low oil adsorption selectivity and recycling incapability of the oil adsorption material in actual application are solved.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation and sol-gel method, and in particular relates to a method for preparing an oil-absorbing material with a multi-level porous structure, superelasticity and high adsorption capacity by using bacterial cellulose composite airgel. Background technique [0002] With the rapid development of today's world economy, people's demand for oil is increasing day by day. In the process of oil transportation and exploitation, frequent oil spill accidents have caused great damage to the marine ecological environment and seriously threatened the surrounding ecological environment and human health. Therefore, effectively solving the problem of oil pollution has become an urgent and arduous task today. Task. At present, there are mainly the following methods to deal with oil pollution: 1. Direct combustion method; 2. Physical mechanical method, such as deploying oil booms and oil skimmers; 3....

Claims

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Application Information

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IPC IPC(8): C08J9/40C08J9/28C08L1/02B01J20/24B01J20/30
CPCB01J20/103B01J20/24C08J9/28C08J9/40C08J2201/0484C08J2205/026C08J2301/02
Inventor 李晓雷何健赵航远于慧君季惠明苏冬
Owner 霖晓(天津)科技有限公司
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