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Lignin-based bio-carbon/silicon dioxide multi-scale nano hybrid material and preparation method and application of nano hybrid material

A nano-hybrid material, silicon dioxide technology, applied in the direction of silicon dioxide, silicon oxide, nanotechnology, etc., can solve the problems of cumbersome post-treatment process, incapable of large-scale production, high cost of raw materials, etc., to avoid agglomeration, high Structural, high specific surface area effect

Active Publication Date: 2017-05-31
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of these carbon / silicon dioxide nano-hybrid materials is complex, and the cost of raw materials used is high or the post-processing process is cumbersome, resulting in the inability to mass-produce
However, nano-silica and biochar, especially lignin-based biochar, to form multi-scale hybrid nanomaterials have not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Purification: Disperse 100 g of alkali lignin in 1000 g of water, add sodium hydroxide to adjust the pH value to 12.5 and stir mechanically. After the alkali lignin is fully dissolved, the cellulose, hemicellulose and insoluble impurities in the lignin solution are separated by suction filtration.

[0031] (2) Hybridization: Add 473g of sodium silicate nonahydrate to the purified lignin solution, and use sulfuric acid with a concentration of 2% to adjust the pH value of the solution to 12, then add 3g of γ-aminopropyltriethoxysilane , formaldehyde 21g, heated and stirred at 70°C, and reacted for 60 minutes.

[0032] (3) Aging: Adjust the pH of the hybridized solution to 7.5 with sulfuric acid at a concentration of 1 mol / L, and place it at room temperature for 4 hours.

[0033] (4) Filtration: adjust the pH value of the aged solution to 3, filter and wash with water for 3-5 times.

[0034] (5) Drying: The lignin / silicon dioxide hybrid material that has been washed ...

Embodiment 2

[0038] (1) Purification: Disperse 100 g of alkali lignin in 3000 g of water, add sodium hydroxide to adjust the pH value to 12.5 and stir mechanically. After the alkali lignin is fully dissolved, the cellulose, hemicellulose and insoluble impurities in the lignin solution are separated by pressure filtration.

[0039] (2) Hybridization: Add industrial water glass (modulus 3.3, SiO 2 Content 28%) 1071g, and with the sulfuric acid that concentration is 1%, adjust solution pH value to be 12, then add diethylenetriamine 15.5g, formaldehyde 5.4g, heat and stir at 80 ℃, react for 60 minutes.

[0040](3) Aging: Adjust the pH of the hybridized solution to 7.5 with sulfuric acid at a concentration of 1 mol / L, and place it at room temperature for 4 hours.

[0041] (4) Filtration: adjust the pH value of the aged solution to 5, filter and wash with water for 3-5 times.

[0042] (5) Drying: The lignin / silicon dioxide hybrid material that has been washed repeatedly is dried in an oven at ...

Embodiment 3

[0046] (1) Purification: Disperse 100 g of kraft lignin in 2000 g of water, add sodium hydroxide to adjust the pH value to 12.5 and stir mechanically. After the kraft lignin is fully dissolved, the cellulose, hemicellulose and insoluble impurities in the lignin solution are separated by suction filtration.

[0047] (2) hybridization: in the purified lignin solution, add 50 g of nano silicon dioxide and 710 g of sodium silicate nonahydrate prepared by precipitation method, and use concentration of 0.1%-2% sulfuric acid to adjust the pH value of the solution to 12, Then add 21 g of formaldehyde and 2.5 g of γ-(2,3-glycidoxy)propyltrimethoxysilane, heat and stir at 90° C., and react for 120 minutes.

[0048] (3) Aging: Adjust the pH of the hybridized solution to 7 with sulfuric acid at a concentration of 1 mol / L, and place it at room temperature for 6 hours.

[0049] (4) Filtration: adjust the pH value of the aged solution to 3, filter and wash with water for 3-5 times.

[0050...

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Abstract

The invention relates to a lignin-based bio-carbon / silicon dioxide multi-scale nano hybrid material and a preparation method thereof. The method comprises the steps of (1) purifying to obtain purified lignin solution; (2) carrying out hybridization to obtain a hybridized solution; (3) ageing to obtain an aged solution; (4) filtering to obtain a lignin / silicon dioxide hybrid material; and (5) drying and carrying out thermal treatment to obtain thelignin-based bio-carbon / silicon dioxide multi-scale nano hybrid material. Compared with the prior art, the lignin-based bio-carbon / silicon dioxide multi-scale nano hybrid material has the beneficial effects that (1) the hybridized nano silicon dioxide particles are smaller and more uniform in size and not easy to reunite, and the hydrophobicity is increased; (2) the lignin-based bio-carbon / silicon dioxide multi-scale nano hybrid material has higher constitutive property and higher pore volume; (3) the lignin-based bio-carbon / silicon dioxide multi-scale nano hybrid material is renewable, lignin is converted into a dispersible nano carbon material to maximize the value while production cost of nano silicon dioxide is reduced; and (4) the lignin-based bio-carbon / silicon dioxide multi-scale nano hybrid material can be applied to the fields of adsorption, catalysis, sensing, energy and polymer enhancement.

Description

technical field [0001] The invention relates to a lignin-based biochar / silicon dioxide multi-scale nano-hybrid material and its preparation method and application, belonging to the technical field of chemical production methods. Background technique [0002] Compared with traditional materials, due to the size of one dimension of nanomaterials being less than 100nm, the surface electronic structure and crystal structure of nanomaterials have obvious changes, showing many properties that conventional materials do not have, such as small size effect, quantum size effect, macroscopic quantum Tunneling effect, surface effect and dielectric confinement effect etc. Because of these special properties, nanomaterials have a very wide range of potential applications in various fields, such as microelectronics, energy, optics, biomedicine, catalysis, polymer modification and other fields. With the rapid development of nanotechnology, in order to meet the growing and diverse needs of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18B82Y30/00B82Y40/00
CPCC01B33/18C01P2006/12
Inventor 蒋灿
Owner WUHAN INSTITUTE OF TECHNOLOGY
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