A kind of nano silver-lignin carbon composite material and its preparation method and application

A technology of lignin carbon and composite materials, which is applied in the preparation of organic compounds, preparation of amino hydroxyl compounds, chemical instruments and methods, etc., can solve the problem of difficulty in reusing nano-silver-lignin composite materials, the inability to use nano-silver, and the mechanical strength Poor problems, to achieve the effect of enhancing reducing ability, enhancing binding force, and improving water dispersion performance

Active Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0006] Milczarek G et al. used sodium lignosulfonate to prepare nano-silver sol with an average particle size of 46nm, which can be used as a metal colorimetric probe to detect the concentration of metal ions [Colloids and Surfaces B: Biointerfaces, 2013, 105: 335-341.], However, sodium lignosulfonate cannot be used as a carrier of nano-silver because of its strong water solubility. The obtained nano-silver can only be used once and is difficult to recycle.
And prepare nano-silver with unmodified alkali lignin [ACS SustainableChemistry&Engineering, 2018, 6(6): 7695-7703; International journal of biologicalmacromolecules, 2016, 82: 39-47; ACS applied materials&interfaces, 2014, 6(18 ): 16147-16155.], because of its serious agglomeration, it needs to be dissolved in alkaline or organic solvents to fully utilize the phenolic hydroxyl groups on the lignin, so that the compound needs to be precipitated from the reaction system by adding acidifying reagents after the reaction However, the oxygen-containing functional groups on lignin are difficult to form a stable coordination with silver ions, which makes nano-silver easy to detach during use, and lignin is soluble in alkaline solution and some Organic solvents, poor mechanical strength, these will lead to the difficulty of reusing the nano-silver-lignin composites prepared directly from alkali lignin
Therefore although lignin can be used as the reducing agent and stabilizer for preparing nano-silver, and the carrier that obtains nano-silver is prepared, but the method that lignin plays these three effects simultaneously in the nano-silver preparation process still has more shortcomings and limitations. insufficient

Method used

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  • A kind of nano silver-lignin carbon composite material and its preparation method and application
  • A kind of nano silver-lignin carbon composite material and its preparation method and application
  • A kind of nano silver-lignin carbon composite material and its preparation method and application

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Embodiment 1

[0050] Add 100 parts by mass of wood pulp alkali lignin into water, add an aqueous solution of sodium hydroxide with a mass concentration of 20% under stirring to adjust the pH value to 11, and obtain an aqueous solution with a concentration of 30% by mass; add 10 parts by mass of sodium oleate at room temperature Stir for 1 hour, adjust the pH value to 5 with an aqueous nitric acid solution with a mass concentration of 10%, and precipitate lignin nanoparticles; add 5 parts by mass of sodium bisulfite and heat up to 140°C and stir for 2 hours; cool down to 70°C, in the above reaction solution Add 20% sodium hydroxide aqueous solution to adjust the pH to 9, add 100 mass parts of 37% formaldehyde solution and stir for 30 minutes, then add 100 mass parts of ethylenediamine and react for 2 hours; use 20% mass concentration of sodium hydroxide Aqueous solution Adjust the pH value of the above sulfonated aminated lignin solution to 9, add 35 parts by mass of silver nitrate, and react...

Embodiment 2

[0053] Add 100 parts by mass of bamboo pulp alkali lignin into water, add potassium hydroxide aqueous solution with a mass concentration of 20% under stirring to adjust the pH value to 10, and dissolve it into an aqueous solution with a concentration of 40% by mass percentage; add 5 parts by mass of twelve Alkyl sodium sulfate was stirred for 0.5h, and the pH value was adjusted to 6 with hydrochloric acid aqueous solution with a mass concentration of 10%, and lignin nanoparticles were precipitated; 20 parts by mass of magnesium bisulfite was added and the temperature was raised to 130°C and stirred for 3h; the temperature was lowered to 80°C , adding an aqueous solution of potassium hydroxide with a mass concentration of 20% to the above reaction solution to adjust the pH to 10, adding 50 parts by mass of 37% formaldehyde solution and stirring for 10 minutes, then adding 50 parts by mass of diethylenetriamine and reacting for 3 hours; using a mass concentration of 20% aqueous p...

Embodiment 3

[0056] Add 100 parts by mass of wheatgrass lignin to water, add a 20% aqueous sodium hydroxide solution under stirring to adjust the pH value to 9, and dissolve it into an aqueous solution with a concentration of 35% by mass; add 5 parts by mass of dodecane at room temperature Sodium phenyl sulfonate was stirred for 1 hour, and the pH value was adjusted to 4 with a sulfuric acid aqueous solution with a mass concentration of 10%, and lignin nanoparticles were precipitated; 10 parts by mass of ammonium bisulfite was added and the temperature was raised to 130°C and stirred for 4 hours; the temperature was lowered to 90°C , adding a mass concentration of 20% sodium hydroxide aqueous solution to the above reaction solution to adjust the pH to 9, adding 150 mass parts of 37% formaldehyde solution and stirring for 40 minutes, then adding 150 mass parts of triethylenetetramine and reacting for 4 hours; using a mass concentration of 20% aqueous sodium hydroxide solution adjusted the pH...

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Abstract

The invention belongs to the technical field of catalysts, and discloses a nano-silver-lignin-carbon composite material and a preparation method and application thereof. The method of the present invention comprises the following steps: (1) after the lignin is nanosized under the action of a nanometerizing agent, a sulfonating agent is added to carry out a sulfonation reaction to obtain a sulfonated lignin; (2) reacting with formaldehyde and an aminating agent to obtain a sulfonated lignin (3) react with silver salt to obtain nano-silver; (4) mix with carbonization activator and carbonize at high temperature to obtain nano-silver-lignin-carbon composite material; the mass ratio of each component is as follows: lignin 100 parts; 1-10 parts of nanometerization reagent; 5-20 parts of sulfonating reagent; 50-150 parts of formaldehyde; 50-150 parts of amination reagent; 10-40 parts of silver salt; The composite material of the invention has high nano-silver loading capacity and good recycling performance, and can be applied to the fields of catalytic materials, bactericidal materials, biological materials, optical materials and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a nano-silver-lignin carbon composite material and its preparation method and application. Background technique [0002] Precious metal catalysts are widely used in many aspects such as industrial catalysis, new energy research, automobile exhaust purification and conversion, catalytic hydrogen production and petroleum processing, and are considered to be "vitamins of today's industry". Currently commonly used precious metals are platinum, palladium, rhodium, silver, ruthenium and so on. Their d electron orbitals are not filled, the surface is easy to adsorb reactants, and the strength is moderate, which is conducive to the formation of "active intermediates" in the reaction process, has high catalytic activity, and also has high temperature resistance, oxidation resistance, corrosion resistance, etc. Comprehensive good features. Therefore, the research on the preparation and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52C07C215/76C07C213/00C08H7/00
CPCB01J23/52C07C213/02C08H6/00C07C215/76
Inventor 庞煜霞赵汝斌邱学青杨东杰楼宏铭周明松
Owner SOUTH CHINA UNIV OF TECH
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