Low temperature hydrothermal preparation method of biomass carbon microsphere / nanosphere

A biomass carbon, nanosphere technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as unfavorable large-scale industrial production, unfavorable energy saving, safety issues, etc. The effect of rich oxygen-containing functional groups, high safety, and low hydrothermal carbonization temperature

Inactive Publication Date: 2015-05-27
HUNAN NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] The hydrothermal temperature of the above-mentioned traditional hydrothermal carbonization method is all high except the non-volatile protic acid aqueous solution of non-catalytic amount and fructose are used as raw materials, and the biomass carbon yield is low, but there are few fructose biomass in nature, And other biomass sources are extensive; high hydrothermal temperature is prone to safety problems, and it is not conducive to saving energy and making hydrothermal carbonization conditions greener, both of which are not conducive to the realization of large-scale industrial production; in order to overcome the above-mentioned traditional hydrothermal carbonization methods In order to reduce the hydrothermal carbonization temperature of non-fructose biomass and increase the yield of biomass carbon, the present invention is based on the isomerization reaction of glucose to fructose catalyzed by alkali or Lewis acid, combined with protonic acid to catalyze the hydrolysis reaction of carbohydrates containing glucose units Based on the scientific basis of dehydration and dehydration reactions, a method for the preparation of biomass carbon by base-catalyzed or Lewis acid / protonic acid-catalyzed one-pot hydrothermal carbonization is proposed

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  • Low temperature hydrothermal preparation method of biomass carbon microsphere / nanosphere
  • Low temperature hydrothermal preparation method of biomass carbon microsphere / nanosphere

Examples

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Effect test

Embodiment 1

[0025] Example 1: Put 6 g of glucose into the polytetrafluoroethylene lining of a 100 mL reactor, weigh 0.9 g of urea and dissolve it in 60 mL of deionized water, then add it to the above polytetrafluoroethylene lining, stir with a glass rod to make it all Dissolve, then put into the stainless steel reaction kettle, tighten the reaction kettle, put it in the oven, set the reaction condition as: temperature 110 ° C, the reaction time is 12 h; after the reaction is finished, cool down to room temperature naturally, take out the polytetrafluoroethylene lining, separate it with a high-speed centrifuge, redisperse it with deionized water and 95% ethanol and wash it repeatedly until the supernatant is colorless, The resulting solid was dried to obtain 0.75 g of carbon nanospheres with a particle size of about 450 nm.

Embodiment 2

[0026] Example 2: Put 12 g of glucose into the polytetrafluoroethylene lining of a 100 mL reactor, weigh 5.27 ml of 25% ammonia water and dissolve it in 60 mL of deionized water, add it to the above polytetrafluoroethylene lining, and stir with a glass rod Make it all dissolve, then put it into a stainless steel reaction kettle, tighten the reaction kettle, put it in an oven, and set the reaction conditions as follows: temperature 130 ° C, the reaction time is 48 h; after the reaction is finished, cool down to room temperature naturally, take out the polytetrafluoroethylene lining, separate it with a high-speed centrifuge, redisperse it with deionized water and 95% ethanol and wash it repeatedly until the supernatant is colorless, The resulting solid was dried to obtain 3.55 g of carbon microspheres with a particle size of about 3 μm.

Embodiment 3

[0027] Example 3: Put 3 g of glucose into the polytetrafluoroethylene lining of a 100 mL reactor, weigh 0.09 g KOH and dissolve it in 60 mL of deionized water, then add it to the above polytetrafluoroethylene lining, and stir it with a glass rod to make it all Dissolve, then put it into a stainless steel reaction kettle, tighten the reaction kettle, put it in an oven, set the reaction conditions as follows: temperature 120 °C, the reaction time is 72 h; after the reaction is finished, cool down to room temperature naturally, take out the polytetrafluoroethylene lining, separate it with a high-speed centrifuge, redisperse it with deionized water and 95% ethanol and wash it repeatedly until the supernatant is colorless, The resulting solid was dried to obtain 0.85 g of carbon nanospheres with a particle size of about 300 nm.

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Abstract

The invention discloses a low temperature hydrothermal preparation method of alkali catalysis or Lewis acid / proton acid catalysis biomass. The method is as below: adding a certain amount of biomass, deionized water and a proper amount of alkali or Lewis acid / protonic acid into carbide carbon of biomass to a teflon inner liner, stirring to dissolve soluble biomass, filling into a stainless steel reaction kettle, and placing in an oven and reacting for a while at preset temperature, and reacting insoluble biomass in a device equipped with a heating sleeve and a thermostat magnetic stirrer under the preset temperature, wherein the reaction conditions are as below: temperature of 110-160 DEG C (preferably 120-140 DEG C) and reaction time of 6-72 h (preferably 12-36 h); naturally cooling to room temperature, conducting high speed centrifugal separation, and re-dispersing and repeatedly washing the obtained solid with deionized water and 95% ethanol to obtain a colorless supernatant, and drying to obtain carbon microsphere / nanosphere. The method provided by the invention has the advantages of low hydrothermal carbonation temperature and high carbon production rate of the biomass, and is applicable to large-scale industrial production; and the product can be used as a catalyst carrier or adsorbent.

Description

technical field [0001] The invention relates to the field of preparation of new carbon materials, in particular to a low-temperature hydrothermal preparation method of biomass carbon micro / nano spheres. Background technique [0002] Type the Background Technical Description paragraph here. Activated carbon material has been playing a huge role in environmental protection, adsorption separation and purification because of its excellent adsorption performance. Especially in recent years, new micro / nano-carbon materials, such as carbon nanotubes, carbon nanofibers, graphene, and micro / nano-carbon solid or hollow spheres, have been widely used in biological Sensors, biodiagnostics, electrode materials, hydrogen storage, drug carriers, adsorbents and catalyst carriers have shown broad application prospects. [0003] These new carbon materials are generally prepared by methods such as chemical vapor deposition and high-temperature thermal decomposition, but these traditional met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y30/00B82Y40/00
Inventor 刘亚纯伏再辉尹笃林
Owner HUNAN NORMAL UNIVERSITY
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