CN109956917B - Method for co-producing furfural and carbon quantum dots by biomass and product - Google Patents
Method for co-producing furfural and carbon quantum dots by biomass and product Download PDFInfo
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Abstract
The invention belongs to the field of biomass conversion, and particularly discloses a method for co-producing furfural and carbon quantum dots by biomass and a product. The method comprises the steps of respectively placing dried biomass raw materials and a solid acid catalyst in a first reaction zone and a second reaction zone, introducing inert gas for pressurizing and heating for a period of time, cooling to room temperature after reaction is completed, extracting a liquid product by using an organic solvent to obtain furfural, dissolving a solid product in the organic solvent, selecting supernatant after the solid product is fully dissolved by ultrasonic oscillation, centrifuging the supernatant, filtering to obtain filtrate, adjusting the pH value of the filtrate, dialyzing to obtain dialyzed filtrate, and finally freeze-drying the dialyzed filtrate to obtain the carbon quantum dots. The invention leads the primary volatile component generated by pyrolysis of the biomass raw material at high temperature to generate the furfural through the secondary pyrolysis under the action of the solid acid catalyst, and simultaneously obtains the carbon quantum dots with better quality, thereby realizing the co-production of the furfural and the carbon quantum dots and having better economy.
Description
Technical Field
The invention belongs to the field of biomass conversion, and particularly relates to a method for co-producing furfural and carbon quantum dots by biomass and a product.
Background
Traditional energy sources such as petroleum, coal and natural gas play a vital role in supporting global development. However, under the dual crisis of environmental pollution and energy shortage, the development of clean and renewable new energy sources is receiving increasing attention from countries around the world. The biomass is a renewable resource with abundant reserves, no pollution or low pollution and low cost. Biomass is also the only renewable carbon source in nature at present, showing great potential as an alternative energy source. Therefore, the biomass is used as the raw material to produce chemicals, so that the traditional energy sources can be replaced to a certain extent, and the sustainable development of the society is supported.
In recent years, biomass-based liquid fuels and carbon-based materials have attracted much research attention, and among them, furfural, which is the most important derivative of furan compounds, can be used to produce numerous derivatives by oxidation, condensation, and other reactions, and is widely used in the industries of synthetic plastics, medicines, agricultural chemicals, and the like. At present, research on furfural preparation from biomass is mainly carried out in an inorganic acid or organic acid environment by a hydrolysis method, and although industrialization is realized, pyrolysis under an acidic condition causes severe corrosion.
The carbon quantum dots are a novel carbon-based zero-dimensional material. The carbon quantum dots have the advantages of excellent optical properties, good water solubility, low toxicity, environmental friendliness, wide raw material source, low cost, good biocompatibility and the like, have great advantages in the field of material preparation, and have good application prospects in the fields of medical imaging equipment, tiny light-emitting diodes, chemical sensors, photocatalytic reactions and the like. Since the first discovery of carbon quantum dots, many synthetic methods have been developed, including arc discharge methods, laser ablation methods, electrochemical synthesis methods, chemical oxidation methods, combustion methods, hydrothermal synthesis methods, microwave synthesis methods, template methods, and the like. The carbon source mainly comprises carbon nanotubes, carbon fibers, graphite rods, carbon dust and activated carbon, the cost of the raw materials is relatively high, and the method for preparing the carbon quantum dots by using biomass as the raw material is relatively low in cost but relatively few in application.
Disclosure of Invention
In view of the above-mentioned disadvantages and/or needs for improvement in the prior art, the present invention provides a method and product for co-producing furfural and carbon quantum dots from biomass, wherein the carbon quantum dots with uniform particle size can be prepared while ensuring the furfural yield by designing the process conditions such as mass ratio of biomass to solid acid catalyst, pyrolysis temperature, etc., and thus is particularly suitable for application occasions such as biomass recycling.
To achieve the above object, according to one aspect of the present invention, a method for co-producing furfural and carbon quantum dots from biomass is provided, which comprises the following steps:
(a) respectively placing a dried biomass raw material and a solid acid catalyst in a first reaction zone and a second reaction zone, introducing inert gas for pressurization and heating for a period of time to pyrolyze the biomass raw material to generate a solid product and a volatile component, wherein the volatile component is subjected to secondary pyrolysis under the catalysis of the solid acid catalyst and then condensed to form a liquid product;
(b) and cooling to room temperature after the reaction is finished, extracting the liquid product by using an organic solvent to obtain furfural, dissolving the solid product in the organic solvent, performing ultrasonic oscillation to fully dissolve the furfural, selecting supernatant, centrifuging the supernatant, filtering to obtain filtrate, adjusting the pH of the filtrate, dialyzing to obtain dialyzed filtrate, and finally freeze-drying the dialyzed filtrate to obtain the carbon quantum dots.
More preferably, the biomass raw material in the step (a) has a particle size of 40 to 80 mesh, and is dried by heating the biomass raw material at 100 to 110 ℃ for 20 to 24 hours.
More preferably, the solid acid catalyst in the step (a) is preferably a Na/Fe composite solid acid catalyst or a Fe-based solid acid catalyst, and the mass ratio of the biomass raw material to the solid acid catalyst is preferably 1: 1-1: 20.
More preferably, the inert gas is introduced into the step (a) and pressurized to 1MPa to 1.5MPa, the heating temperature is preferably 500 ℃ to 800 ℃, and the heating time is preferably 10min to 15 min.
As a further preference, the organic solvent used for extracting furfural in step (b) is preferably methanol, acetone or dichloromethane.
As a further preference, the organic solvent used for dissolving the solid product in the step (b) is preferably an alcohol solvent, and is further preferably methanol or ethanol.
Further preferably, the mass ratio of the solid product to the organic solvent in the step (b) is preferably 1:20 to 1: 40.
Further preferably, the time of ultrasonic oscillation in the step (b) is preferably 15min to 20min, the centrifugal rotation speed is preferably 8000rpm to 10000rpm, the centrifugal time is preferably 5min to 10min, and the pH of the filtrate is adjusted to be less than 4.
Further preferably, the dialysis process in the step (b) adopts a dialysis bag with the molecular weight cut-off of 400 Da-1200 Da, the dialysis time is preferably 10 h-12 h, the freeze-drying temperature is preferably-10 ℃ to-20 ℃, and the freeze-drying time is preferably 24 h-48 h.
According to another aspect of the present invention, there is provided furfural and carbon quantum dots prepared by the above method.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. according to the invention, the biomass raw material and the solid acid catalyst are heated separately in different regions in the same reactor, so that a primary volatile component generated by pyrolysis of the biomass raw material at high temperature is subjected to secondary pyrolysis under the action of the solid acid catalyst to generate furfural, and meanwhile, carbon quantum dots with good quality can be obtained from a solid product generated by pyrolysis of the biomass raw material at high temperature through operations such as dissolution, filtration, dialysis and the like, so that co-production of furfural and carbon quantum dots is realized, and the method has good economy while avoiding corrosion of acidic substances;
2. particularly, by controlling the pyrolysis temperature within the range of 500-800 ℃, the invention can avoid that the volatile components can not be completely cracked due to too low temperature, and can also avoid that the cracking of the furfural is aggravated to form small molecules due to too high temperature, thereby effectively providing the yield of the furfural, and meanwhile, the higher the pyrolysis temperature is, the smaller the particle size of the obtained carbon quantum dots is, and the higher the dispersion degree is;
3. meanwhile, the furfural yield is low due to incomplete contact of volatile components caused by excessively low addition ratio of the solid acid catalyst, and the yield is not obviously increased due to the tendency of saturation of the catalyst when the addition ratio of the solid acid catalyst is excessively high, so that the economic benefit is reduced, and therefore, the furfural yield is ensured and the high furfural selectivity can be obtained by controlling the mass ratio of the biomass to the solid acid catalyst within the range of 1: 1-1: 20;
4. the invention can ensure that the grain diameter of the prepared carbon quantum dots is as low as 2 nm-2.4 nm by controlling each reaction condition, and the selectivity of the furfural in furan compound products is over 50 percent.
Drawings
FIG. 1 is a process flow diagram of co-production of furfural and carbon quantum dots from biomass according to the present invention;
FIG. 2 is a graph showing the results of a field emission transmission electron microscope test of carbon quantum dots prepared in example 1;
FIG. 3 is a graph showing the result of high-resolution transmission electron microscopy of the carbon quantum dots prepared in example 1;
FIG. 4 is a graph showing the results of an atomic force microscope test of carbon quantum dots prepared in example 1;
FIG. 5 is a graph showing GC peak areas of furfural and GC peak area percentages of the respective products obtained in examples 1 to 3;
FIG. 6 is a graph of the results of field emission transmission electron microscopy tests on carbon quantum dots prepared in comparative example 1 and examples 1-3, wherein a is the pyrolysis product of comparative example 1, b is the carbon quantum dot of example 2, c is the carbon quantum dot of example 3, and d is the carbon quantum dot of example 1;
FIG. 7 is a graph of GC peak areas and GC peak area percentages of the products for furfural produced in comparative example 2, and examples 4-6.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the present invention provides a method for co-producing furfural and carbon quantum dots from biomass, which comprises the following steps:
(a) heating a biomass raw material with 40 meshes to 80 meshes at 100 ℃ to 110 ℃ for 20h to 24h for drying, then respectively placing the dried biomass raw material and a solid acid catalyst in a first reaction zone and a second reaction zone of a reactor, introducing inert gas such as nitrogen or argon into the reactor, pressurizing to 1MPa to 1.5MPa, placing the reactor after a two-section fixed bed reaches the reaction temperature, heating for 10min to 15min to ensure complete reaction, pyrolyzing the biomass raw material to generate a solid product and volatile components, wherein the volatile components such as dehydrated sugar are subjected to secondary pyrolysis under the catalysis of the solid acid catalyst to generate a furan product, and then entering a condensing device to form a liquid product;
wherein, the solid acid catalyst is used, which not only can avoid the corrosion problem to the reaction instrument, but also is easier to separate after the reaction is finished because of the magnetism; the inert gas is introduced for pressurization in the reaction process, so that the primary volatile component can be ensured to sequentially pass through the solid acid catalyst and the condensing device along with the carrier gas, and the reduction of the yield of the furfural caused by strong back-mixing reaction is avoided;
(b) cooling to room temperature and relieving pressure to atmospheric pressure after the reaction is finished, extracting a liquid product by using an organic solvent such as methanol, acetone or dichloromethane to obtain furfural, dissolving a solid product in the organic solvent such as an alcohol solvent, ultrasonically oscillating for 15min to 20min to separate a micromolecular carbon quantum dot from macromolecular amorphous carbon, fully dissolving the micromolecular carbon quantum dot in the organic solvent, forming a precipitate by the macromolecular amorphous carbon, selecting supernatant liquid to centrifuge the supernatant liquid, filtering to remove medium amorphous carbon to obtain filtrate, regulating the pH of the filtrate to be less than or equal to 4, dialyzing to obtain dialyzed filtrate, and finally freeze-drying the dialyzed filtrate at the temperature of-10 ℃ to-20 ℃ for 24h to 48h to obtain the carbon quantum dot.
Further, the solid acid catalyst in the step (a) is preferably a Na/Fe composite solid acid catalyst or a Fe-based solid acid catalyst, and the mass ratio of the biomass raw material to the solid acid catalyst is preferably 1: 1-1: 20.
Further, the temperature of the two-stage fixed bed in the step (a) is preferably 500-800 ℃, and too low temperature in the pyrolysis process can result in incomplete pyrolysis of primary volatile components, which results in a reduction in the yield of furfural, while too high temperature can aggravate the pyrolysis of furfural to form small molecules, which can also reduce the yield of furfural, and meanwhile, the pyrolysis temperature also directly affects the quality of carbon quantum dots, and the higher the temperature is, the smaller the particle size of the obtained carbon quantum dots is, and the higher the dispersity is.
Further, the mass ratio of the solid product to the organic solvent in the step (b) is preferably 1: 20-1: 40, too high mass of the organic solvent can cause difficulty in obtaining carbon quantum dots, and too low mass of the organic solvent can increase dialysis time, which increases production cost.
Further, the organic solvent dissolving the solid product in the step (b) is further preferably methanol or ethanol.
Further, the centrifugal rotation speed in the step (b) is preferably 8000rpm to 10000rpm, and the centrifugal time is preferably 5min to 10 min.
Further, the dialysis process in the step (b) adopts a dialysis bag with the molecular weight cutoff of 400 Da-1200 Da, and the dialysis time is preferably 10 h-12 h.
The present invention will now be described in further detail by taking a specific method for co-producing furfural and carbon quantum dots from biomass and a product thereof as examples.
Comparative example 1
(a) Heating a biomass raw material of 40-80 meshes at 100 ℃ for 24h for drying, then respectively placing the biomass raw material and a Na/Fe composite solid acid catalyst in a first reaction zone and a second reaction zone of a reactor according to a mass ratio of 1:10, introducing nitrogen into the reactor to pressurize to 1.5MPa, placing the reactor after a two-section fixed bed reaches 450 ℃, heating for 15min to pyrolyze the biomass raw material to generate a solid product and volatile components, wherein the volatile components are subjected to secondary pyrolysis under the catalysis of the solid acid catalyst and then enter a condensing device to form a liquid product;
(b) cooling to room temperature and relieving pressure to atmospheric pressure after the reaction is finished, extracting a liquid product by using methanol to obtain furfural, dissolving a solid product in an ethanol solvent, wherein the mass ratio of the solid product to the ethanol solvent is 1:30, performing ultrasonic oscillation for 15min to fully dissolve the solid product, selecting supernatant, centrifuging at 8000rpm for 5min, filtering to obtain filtrate, regulating the pH of the filtrate to be less than or equal to 4, dialyzing for 12h by using a dialysis bag with the molecular weight cutoff of 1200Da to obtain dialyzed filtrate, and finally freeze-drying the dialyzed filtrate at-15 ℃ for 24h to obtain the carbon quantum dots.
Comparative example 2
(a) Heating a biomass raw material of 40-80 meshes at 100 ℃ for 24h for drying, then respectively placing the biomass raw material and a Na/Fe composite solid acid catalyst in a first reaction zone and a second reaction zone of a reactor according to a mass ratio of 1:0.2, introducing nitrogen into the reactor to pressurize to 1.5MPa, placing the reactor after a two-section fixed bed reaches 550 ℃, heating for 15min to pyrolyze the biomass raw material to generate a solid product and volatile components, wherein the volatile components are subjected to secondary pyrolysis under the catalysis of the solid acid catalyst and then enter a condensing device to form a liquid product;
(b) cooling to room temperature and relieving pressure to atmospheric pressure after the reaction is finished, extracting a liquid product by using methanol to obtain furfural, dissolving a solid product in an ethanol solvent, wherein the mass ratio of the solid product to the ethanol solvent is 1:30, performing ultrasonic oscillation for 15min to fully dissolve the solid product, selecting a supernatant, centrifuging at 8000rpm for 5min, filtering to obtain a filtrate, adjusting the pH of the filtrate to be less than or equal to 4, dialyzing for 12h by using a dialysis bag with the molecular weight cutoff of 1200Da to obtain a dialyzed filtrate, and finally freeze-drying the dialyzed filtrate at-15 ℃ for 24h to obtain the carbon quantum dots.
Example 1
(a) Heating a biomass raw material of 40-80 meshes at 100 ℃ for 24h for drying, then respectively placing the biomass raw material and a Na/Fe composite solid acid catalyst in a first reaction zone and a second reaction zone of a reactor according to a mass ratio of 1:10, introducing nitrogen into the reactor to pressurize to 1.5MPa, placing the reactor after a two-section fixed bed reaches 750 ℃, heating for 15min to pyrolyze the biomass raw material to generate a solid product and volatile components, wherein the volatile components are subjected to secondary pyrolysis under the catalysis of the solid acid catalyst and then enter a condensing device to form a liquid product;
(b) cooling to room temperature and relieving pressure to atmospheric pressure after the reaction is finished, extracting a liquid product by using methanol to obtain furfural, dissolving a solid product in an ethanol solvent, wherein the mass ratio of the solid product to the ethanol solvent is 1:30, performing ultrasonic oscillation for 15min to fully dissolve the solid product, selecting a supernatant, centrifuging at 8000rpm for 5min, filtering to obtain a filtrate, adjusting the pH of the filtrate to be less than or equal to 4, dialyzing for 12h by using a dialysis bag with the molecular weight cutoff of 1200Da to obtain a dialyzed filtrate, and finally freeze-drying the dialyzed filtrate at-15 ℃ for 24h to obtain the carbon quantum dots.
FIG. 2 is a graph showing the results of a field emission transmission electron microscope (FTEM) test on the carbon quantum dots prepared in example 1, wherein it can be seen that the prepared carbon quantum dots have uniform sizes and concentrated particle sizes ranging from 2nm to 2.4 nm;
FIG. 3 is a graph of the results of High Resolution Transmission Electron Microscopy (HRTEM) tests on the carbon quantum dots prepared in example 1, wherein the carbon quantum dots have obvious lattice stripe textures, and the interplanar spacing is about 0.21 nm;
fig. 4 is a graph showing the 3D results of Atomic Force Microscope (AFM) tests of the carbon quantum dots prepared in example 1, and it can be seen that the thickness of the detected carbon dot microspheres in the three-dimensional Z-axis is relatively uniform and is substantially maintained at about 5 nm.
Example 2
The temperature of the fixed bed in this example was 550 ℃ and the other conditions were the same as in example 1.
Example 3
The temperature of the fixed bed in this example was 650 ℃ and the other conditions were the same as in example 1.
FIG. 5 is a graph of GC peak area of furfural and GC peak area percentage of each product obtained in examples 1 to 3, from which it can be seen that the selectivity of furfural is very high in furan compound products, and the content of furfural in furan compound is more than 50%, and with the increase of heating temperature, the yield (peak area percentage) of furfural increases first and then decreases, reaching a maximum at 650 ℃;
fig. 6 is a graph of the results of the FTEM results of the carbon quantum dots prepared in comparative example 1 and examples 1 to 3, wherein a, b, c, and d are the carbon quantum dots prepared in comparative example 1, example 2, example 3, and example 1, respectively, and the results show that the high-aggregation amorphous biomass carbon prepared by low-temperature pyrolysis in comparative example 1 is high-aggregation amorphous biomass carbon, and the particle size of the prepared product is changed from tens of nanometers to several nanometers by continuous cracking of the carbon quantum dots with the increase of the pyrolysis temperature, and high-quality carbon quantum dots with high dispersion degree and uniform particle size can be obtained at 750 ℃.
Example 4
In the embodiment, the mass ratio of the biomass raw material to the Na/Fe composite solid acid catalyst is 1:1, and other conditions are the same as those in the embodiment 2.
Example 5
In the embodiment, the mass ratio of the biomass raw material to the Na/Fe composite solid acid catalyst is 1:5, and other conditions are the same as those in the embodiment 2.
Example 6
In the embodiment, the mass ratio of the biomass raw material to the Na/Fe composite solid acid catalyst is 1:20, and other conditions are the same as those in the embodiment 2.
Fig. 7 is a graph of GC peak areas of furfural and GC peak area percentages of products obtained in comparative example 2, example 2 and examples 4 to 6, when the mass ratio of the biomass raw material to the Na/Fe composite solid acid catalyst is 1:1 to 1:20, the selectivity of furfural is high in the products, and when the addition ratio of the solid acid catalyst is increased, the selectivity of furfural is increased first and then slightly decreased, and reaches a maximum of 64.7% at 1:10, while the yield of furfural is decreased first and then increased, and is much higher than that at 1:0.2, so that higher furfural selectivity can be obtained while ensuring the yield of furfural within the range provided by the present invention.
Example 7
(a) Heating a biomass raw material of 40-80 meshes at 105 ℃ for 24h for drying, then respectively placing the biomass raw material and a Na/Fe composite solid acid catalyst in a first reaction zone and a second reaction zone of a reactor according to a mass ratio of 1:10, introducing argon into the reactor to pressurize to 1MPa, placing the reactor after a two-section fixed bed reaches 500 ℃, heating for 15min to pyrolyze the biomass raw material to generate a solid product and volatile components, wherein the volatile components are subjected to secondary pyrolysis under the catalysis of the solid acid catalyst and then enter a condensing device to form a liquid product;
(b) cooling to room temperature and relieving pressure to atmospheric pressure after the reaction is finished, extracting a liquid product by using dichloromethane to obtain furfural, dissolving a solid product in an ethanol solvent, wherein the mass ratio of the solid product to ethanol is 1:20, performing ultrasonic oscillation for 20min to fully dissolve the solid product, selecting supernatant, centrifuging at 10000rpm for 10min, filtering to obtain filtrate, adjusting the pH of the filtrate to be less than or equal to 4, dialyzing for 12h by using a dialysis bag with the molecular weight cutoff of 400Da to obtain dialyzed filtrate, and finally freeze-drying the dialyzed filtrate at-20 ℃ for 24h to obtain the carbon quantum dots.
Example 8
(a) Heating a biomass raw material of 40-80 meshes at 110 ℃ for 20h for drying, then respectively placing the biomass raw material and a Fe-based solid acid catalyst in a first reaction zone and a second reaction zone of a reactor according to a mass ratio of 1:10, introducing nitrogen into the reactor to pressurize to 1MPa, placing the reactor after a two-section fixed bed reaches 800 ℃, heating for 15min to pyrolyze the biomass raw material to generate a solid product and volatile components, wherein the volatile components are subjected to secondary pyrolysis under the catalysis of the solid acid catalyst, and then entering a condensing device to form a liquid product;
(b) cooling to room temperature and relieving pressure to atmospheric pressure after the reaction is finished, extracting a liquid product by using acetone to obtain furfural, dissolving a solid product in a methanol solvent, controlling the mass ratio of the solid product to the methanol to be 1:40, performing ultrasonic oscillation for 20min to fully dissolve the solid product, selecting supernatant, centrifuging for 5min at 10000rpm, filtering to obtain filtrate, regulating the pH of the filtrate to be less than or equal to 4, dialyzing for 10h by using a dialysis bag with the molecular weight cutoff of 800Da to obtain dialyzed filtrate, and finally freeze-drying the dialyzed filtrate at-10 ℃ for 48h to obtain the carbon quantum dots.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for co-producing furfural and carbon quantum dots by biomass is characterized by comprising the following steps:
(a) respectively placing a dried biomass raw material and a solid acid catalyst in a first reaction zone and a second reaction zone, introducing inert gas, pressurizing to 1-1.5 MPa, heating at 500-800 ℃ for 10-15 min, and pyrolyzing the biomass raw material to generate a solid product and volatile components, wherein the volatile components are subjected to secondary pyrolysis under the catalysis of the solid acid catalyst and then condensed to form a liquid product, and the solid acid catalyst is a Na/Fe composite solid acid catalyst or a Fe-based solid acid catalyst;
(b) and cooling to room temperature after the reaction is finished, extracting the liquid product by using an organic solvent to obtain furfural, dissolving the solid product in the organic solvent, performing ultrasonic oscillation to fully dissolve the furfural, selecting supernatant, centrifuging the supernatant, filtering to obtain filtrate, adjusting the pH of the filtrate, dialyzing by using a dialysis bag with the molecular weight cutoff of 400 Da-1200 Da to obtain dialyzed filtrate, and finally freeze-drying the dialyzed filtrate to obtain the carbon quantum dots.
2. The method for co-producing furfural and carbon quantum dots by biomass according to claim 1, wherein the particle size of the biomass raw material in the step (a) is 40 to 80 meshes, and the biomass raw material is dried by heating at 100 to 110 ℃ for 20 to 24 hours.
3. The method for co-producing furfural and carbon quantum dots by biomass according to claim 1 or 2, wherein the mass ratio of the biomass raw material to the solid acid catalyst in the step (a) is 1: 1-1: 20.
4. The method for co-producing furfural and carbon quantum dots with biomass as claimed in claim 1, wherein the organic solvent used for extracting furfural in the step (b) is methanol, acetone or dichloromethane.
5. The method for co-producing furfural and carbon quantum dots with biomass according to claim 1, wherein the organic solvent used for dissolving the solid products in the step (b) is an alcohol solvent.
6. The method for co-producing furfural and carbon quantum dots with biomass as claimed in claim 5, wherein the alcohol solvent is methanol or ethanol.
7. The method for co-producing furfural and carbon quantum dots by using biomass as claimed in claim 1, wherein the mass ratio of the solid product to the organic solvent in the step (b) is 1: 20-1: 40.
8. The method for co-producing furfural and carbon quantum dots by using biomass as claimed in claim 1, wherein the time of ultrasonic oscillation in the step (b) is 15min to 20min, the centrifugal rotation speed is 8000rpm to 10000rpm, the centrifugal time is 5min to 10min, and the pH of the filtrate is adjusted to be below 4.
9. The method for co-producing furfural and carbon quantum dots by biomass according to claim 1, wherein the dialysis time in the step (b) is 10 to 12 hours, the freeze-drying temperature is-10 to-20 ℃, and the freeze-drying time is 24 to 48 hours.
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| CN201910208791.XA CN109956917B (en) | 2019-03-19 | 2019-03-19 | Method for co-producing furfural and carbon quantum dots by biomass and product |
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| CN109956917B true CN109956917B (en) | 2021-07-02 |
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