CN112095113A - Method for preparing carbon quantum dots by taking coal as raw material - Google Patents
Method for preparing carbon quantum dots by taking coal as raw material Download PDFInfo
- Publication number
- CN112095113A CN112095113A CN202010930531.6A CN202010930531A CN112095113A CN 112095113 A CN112095113 A CN 112095113A CN 202010930531 A CN202010930531 A CN 202010930531A CN 112095113 A CN112095113 A CN 112095113A
- Authority
- CN
- China
- Prior art keywords
- coal
- carbon quantum
- quantum dots
- chloride ions
- water slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
Abstract
The invention belongs to the field of carbon nano materials, and particularly relates to a preparation method of carbon quantum dots. Compared with the organic micromolecules, graphite or graphene and other raw materials, the coal powder is used as a carbon source to prepare the carbon quantum dots, the cost is relatively low, and the high-value utilization of coal is facilitated. In addition, compared with a coal rod used as a working electrode, the carbon quantum dots are prepared by directly carrying out electrochemical oxidation on the coal water slurry, and the method has the advantages of easy production scale amplification and electrode reutilization.
Description
Technical Field
The invention particularly relates to a preparation method of carbon quantum dots, and belongs to the field of carbon nano materials.
Background
The carbon quantum dot is a novel zero-dimensional carbon-based nano material, has the size less than 10nm and has a quasi-spherical structure. The structure comprises two parts: surface groups and a carbonaceous core. The surface groups are mainly some oxygen-containing functional groups, such as hydroxyl, carboxyl and the like, and the interior of the carbonaceous core is mainly formed by sp2And sp3Hybrid carbon formation, forming amorphous carbon, graphite crystallites, single or multi-layer graphene fragments, and the like. Compared with the original materials such as semiconductor quantum dots and the like, the carbon quantum dots not only keep the specific advantages of carbon materials, such as low toxicity, good biocompatibility and the like, but also have the advantages of better light stability, adjustable light-emitting wavelength, easy surface functionalization, rich raw material sources, simple and convenient preparation method and the like. Existing carbon quantum dot synthesis strategies can be summarized into two main categories: "top-down" and "bottom-up". The 'bottom-up' principle adopts micromolecular organic matters and the like as carbon sources, and the carbon quantum dots are finally synthesized through a series of changes such as polycondensation reaction and the like through reaction operations such as dehydration, carbonization and the like. The top-down method generally adopts graphite, graphene or carbon nanotubes with macromolecular structures as carbon sources, and the macromolecular structures of the carbon sources are partially degraded or modified by means of oxidation, etching and the like, so that the carbon quantum dots are prepared.
Disclosure of Invention
The invention discloses a method for preparing carbon quantum dots, which comprises the steps of dissolving coal and sodium chloride in water to prepare coal water slurry, and carrying out electrochemical oxidation to prepare the carbon quantum dots.
A preparation method of a carbon quantum dot comprises the following steps:
1) coal is taken as a carbon source, raw material coal is crushed into coal powder and then uniformly dispersed in an aqueous solution containing chloride ions with a certain molar concentration to prepare coal water slurry;
2) electrifying the coal water slurry to carry out electrolytic oxidation reaction by taking graphite or titanium coated with ruthenium oxide as an anode and graphite or a nickel net as a cathode;
3) after the reaction is finished, centrifugally separating the obtained mixture, then filtering the supernatant obtained by centrifugal separation, putting the obtained filtrate into a dialysis bag with the molecular weight cutoff of 3500Da, dialyzing for 3 days, and changing water once every 12 h;
4) and concentrating the solution in the dialysis bag through reduced pressure distillation, and then freeze-drying to obtain the solid carbon quantum dots.
Further, the molar concentration of the chloride ions in the aqueous solution containing the chloride ions is 0.1mol/L to 3 mol/L.
Furthermore, in the coal water slurry, the mass concentration of the coal dust is preferably 2g/L to 30 g/L.
Further, in the electrolytic oxidation reaction, the current density is preferably 0.1A/cm2To 2A/cm2The electrolysis time is 0.5h to 10 h.
In a preferred embodiment, the raw material coal is any one of lignite, subbituminous coal, bituminous coal and anthracite, and is pulverized to 100 mesh or more before use.
In another preferred embodiment, in the above technical solution, the aqueous solution containing chloride ions may be seawater or industrial wastewater containing chloride ions. In the technical scheme of the invention, the electrolyte solution adopts the seawater or the salt lake water rich in sodium chloride, so that the method has the advantages of extremely rich raw materials, low production and operation cost and easy large-scale industrial application, and the electrolyte solution adopts the industrial wastewater containing chloride ions, so that the high-value utilization of the industrial salt-containing wastewater can be realized, the waste is changed into the valuable, and the environmental protection benefit is very obvious.
The principle of the method of the invention is as follows: the microstructure of coal contains amorphous carbon domains composed of aliphatic groups and crystalline carbon domains of nanometer order formed by condensed aromatic hydrocarbons. Crystalline carbon in the coal structure is easily oxidized, producing nanometer-sized carbon quantum dots with amorphous carbon attached to the edges. Coal is used as a carbon source, coal powder is prepared into coal water slurry by using an aqueous solution containing chloride ions, and then the coal water slurry is used as an electrolyte to carry out electrochemical oxidation reaction. After the water coal slurry containing the chloride ions is electrified, the chloride ions can be oxidized at the anode of the electrode to generate chlorine, and then the chlorine ions are dissolved in the water solution to generate hypochlorite ions with high stability and strong oxidizing property, and the hypochlorite ions can effectively attack the coal powder dispersed in the electrolyte to oxidize the crystal carbon area in the structure of the coal powder, so that the carbon quantum dots are generated.
Compared with the preparation method of the quantum dots in the prior art, the preparation method has the following beneficial effects:
(1) the preparation method of the carbon quantum dots provided by the invention takes the coal resources with abundant coal reserves in China as the main raw materials, the cost of the raw materials is lower, the additional value of the prepared carbon quantum dots is higher, and a new way for realizing high-value utilization of the coal resources is provided.
(2) The method directly carries out electrochemical oxidation on the coal water slurry to prepare the carbon quantum dots, and has the advantages of simple preparation process, easy production scale amplification and electrode reutilization compared with a coal rod serving as a working electrode.
(3) A considerable part of industrial wastewater belongs to industrial wastewater with higher chloride content, for example, the chloride ion concentration of pickling wastewater in the pickle industry can reach 1153000mg/L, if the pickling wastewater is directly discharged into a water body without control, the pickling wastewater seriously harms the water environment, destroys the water balance, influences the water quality, influences fishery production, agricultural irrigation and fresh water resources, and even pollutes underground water and drinking water sources in serious cases. In a further preferred embodiment of the invention, the electrolyte raw material is industrial wastewater containing chloride ions, so that high-value utilization of the industrial salt-containing wastewater can be realized, and the environmental protection benefit is very obvious.
Drawings
Fig. 1 is a transmission electron microscope image and a particle size distribution diagram of a nitrogen and sulfur co-doped carbon quantum dot prepared in example 1 of the present invention, in which (a) a transmission electron microscope image of a carbon quantum dot prepared using coal as a carbon source; (b) the particle size distribution histogram of the carbon quantum dots.
FIG. 2 is an ultraviolet-visible absorption spectrum and a fluorescence emission spectrum of a carbon quantum dot prepared by using coal as a carbon source.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
(1) Selecting Zhaotong lignite as a raw material, crushing the Zhaotong lignite to be more than 100 meshes, and then uniformly dispersing coal powder in a sodium chloride aqueous solution with the chloride ion concentration of 3mol/L by stirring to prepare the coal water slurry with the concentration of 2 g/L.
(2) Titanium coated with ruthenium oxide is used as an anode, a nickel net is used as a cathode, and the current density is 0.5A/cm2And (3) electrifying the coal water slurry obtained in the step (1) for electrolytic oxidation for 1.5 h.
(3) After the reaction, the mixture obtained in (2) is centrifuged at a high speed, unreacted residues are filtered off, and the obtained filtrate is filled into a dialysis bag with the molecular weight cutoff of 3500Da and dialyzed for 3 days, and water is replaced every 12 h.
(4) And concentrating the solution in the dialysis bag by reduced pressure distillation, and then freeze-drying to obtain the solid carbon quantum dots, wherein the quantum yield of the carbon quantum dots is 0.9%.
The carbon quantum dots prepared in example 1 were characterized using transmission electron microscopy. As shown in FIG. 1, it can be seen that the carbon has a uniform quantum distribution, a narrow particle diameter of 0.5 to 3.5nm and an average diameter of 1.81 nm. The optical properties of the carbon quantum dots in example 1 were studied using an ultraviolet-visible spectrophotometer and a fluorescence spectrophotometer, and as shown in fig. 2, the carbon quantum dots have strong absorption in the ultraviolet region, and the absorption is more significant the shorter the wavelength is. The maximum emission peak (450nm) of the carbon quantum dot is obtained under excitation of 340nm, and a shoulder peak of the emission peak at 400nm can be observed.
XPS tests were performed on the elements of the surface of the carbon quantum dots prepared in example 1, and the results are shown in table 1. From the data in table 1, it can be found that the carbon quantum dots mainly contain two elements of carbon (284.79eV) and oxygen (531.94eV), wherein the content of the carbon element is 60.86%, and the content of the oxygen element is 30.41%. And because the used raw material is lignite, the content of nitrogen and sulfur elements is relatively high, and a small amount of nitrogen and sulfur elements exist in the generated carbon quantum dots. In addition, the electrolyte containing chloride ions is adopted in the preparation method, so that the prepared carbon quantum dots inevitably contain a small amount of chlorine element.
TABLE 1 XPS data for carbon quantum dots prepared using coal as a carbon source
Example 2
(1) Selecting Yining bituminous coal as a raw material, crushing the raw material to be more than 100 meshes, and then uniformly dispersing coal powder in a potassium chloride aqueous solution with the chloride ion concentration of 3mol/L by stirring to prepare the coal water slurry with the concentration of 10 g/L.
(2) Titanium coated with ruthenium oxide is used as an anode, a nickel net is used as a cathode, and the current density is 0.5A/cm2And (3) electrifying the coal water slurry obtained in the step (1) for electrolytic oxidation for 1.0 h.
(3) After the reaction, the mixture obtained in (2) is centrifuged at a high speed, unreacted residues are filtered off, and the obtained filtrate is filled into a dialysis bag with the molecular weight cutoff of 3500Da and dialyzed for 3 days, and water is replaced every 12 h.
(4) And concentrating the solution in the dialysis bag through reduced pressure distillation, and then freeze-drying to obtain the solid carbon quantum dots, wherein the quantum yield of the carbon quantum dots is 0.99%.
Example 3
(1) Selecting Zhaotong lignite as a raw material, crushing the Zhaotong lignite to be more than 100 meshes, and then uniformly dispersing pulverized coal into a magnesium chloride aqueous solution with the chloride ion concentration of 0.6mol/L by stirring to prepare the coal water slurry with the concentration of 10 g/L.
(2) Titanium coated with ruthenium oxide is used as an anode, a nickel net is used as a cathode, and the current density is 0.5A/cm2And (3) electrifying the coal water slurry obtained in the step (1) for electrolytic oxidation for 1.0 h.
(3) After the reaction, the mixture obtained in (2) is centrifuged at a high speed, unreacted residues are filtered off, and the obtained filtrate is filled into a dialysis bag with the molecular weight cutoff of 3500Da and dialyzed for 3 days, and water is replaced every 12 h.
(4) And concentrating the solution in the dialysis bag by reduced pressure distillation, and then freeze-drying to obtain the solid carbon quantum dots, wherein the quantum yield of the carbon quantum dots is 0.84%.
Example 4
(1) The method comprises the steps of selecting Luliang bituminous coal as a raw material, crushing the raw material to be more than 100 meshes, and then uniformly dispersing pulverized coal into industrial salt-containing wastewater with the chloride ion concentration of 3mol/L through stirring to prepare coal water slurry with the concentration of 10 g/L.
(2) Titanium coated with ruthenium oxide is used as an anode, a nickel net is used as a cathode, and the current density is 0.5A/cm2And (3) electrifying the coal water slurry obtained in the step (1) for electrolytic oxidation for 1.0 h.
(3) After the reaction, the mixture obtained in (2) is centrifuged at a high speed, unreacted residues are filtered off, and the obtained filtrate is filled into a dialysis bag with the molecular weight cutoff of 3500Da and dialyzed for 3 days, and water is replaced every 12 h.
(4) And concentrating the solution in the dialysis bag by reduced pressure distillation, and then freeze-drying to obtain the solid carbon quantum dots, wherein the quantum yield of the carbon quantum dots is 1.14%.
Example 5
(1) Selecting Zhaotong lignite as a raw material, crushing the Zhaotong lignite to be more than 100 meshes, and then uniformly dispersing pulverized coal into industrial salt-containing wastewater with the chloride ion concentration of 0.1mol/L by stirring to prepare the coal water slurry with the concentration of 10 g/L.
(2) Titanium coated with ruthenium oxide is used as an anode, a nickel net is used as a cathode, and the current density is 1.0A/cm2And (3) electrifying the coal water slurry obtained in the step (1) for electrolytic oxidation for 1.0 h.
(3) After the reaction, the mixture obtained in (2) is centrifuged at a high speed, unreacted residues are filtered off, and the obtained filtrate is filled into a dialysis bag with the molecular weight cutoff of 3500Da and dialyzed for 3 days, and water is replaced every 12 h.
(4) And concentrating the solution in the dialysis bag by reduced pressure distillation, and then freeze-drying to obtain the solid carbon quantum dots, wherein the quantum yield of the carbon quantum dots is 0.91%.
Example 6
(1) Selecting the Jincheng anthracite as a raw material, crushing the anthracite into more than 100 meshes, and then uniformly dispersing the coal powder into the saline lake water with the chloride ion concentration of 3mol/L by stirring to prepare the coal water slurry with the concentration of 30 g/L.
(2) Graphite flakes are respectively used as anode and cathode materials, and the current density is 2.0A/cm2And (3) electrifying the coal water slurry obtained in the step (1) for electrolytic oxidation for 10 h.
(3) After the reaction, the mixture obtained in (2) is centrifuged at a high speed, unreacted residues are filtered off, and the obtained filtrate is filled into a dialysis bag with the molecular weight cutoff of 3500Da and dialyzed for 3 days, and water is replaced every 12 h.
(4) And concentrating the solution in the dialysis bag by reduced pressure distillation, and then freeze-drying to obtain the solid carbon quantum dots, wherein the quantum yield of the carbon quantum dots is 0.95%.
Claims (7)
1. A preparation method of carbon quantum dots is characterized in that coal water slurry containing chloride ions with a certain molar concentration is taken as electrolyte, graphite or titanium coated with ruthenium oxide is taken as an anode, graphite or a nickel net is taken as a cathode, and the coal water slurry is electrified for electrolysis; and after the reaction is finished, performing high-speed centrifugal separation on the obtained mixture, filtering supernatant obtained by centrifugal separation, filling the obtained filtrate into a dialysis bag with the molecular weight cutoff of 3500Da, dialyzing for 3 days, changing water every 12h, concentrating the solution in the dialysis bag by reduced pressure distillation, and then freeze-drying to obtain the solid carbon quantum dots.
2. The method for preparing the carbon quantum dots according to claim 1, wherein the raw materials for preparing the coal-water slurry are coal and the aqueous solution containing the chloride ions, and the coal-water slurry is prepared by crushing the coal into coal powder and then uniformly dispersing the coal powder in the aqueous solution containing the chloride ions.
3. The method according to claim 2, wherein the molar concentration of the chloride ions in the aqueous solution containing chloride ions is 0.1 to 3 mol/L.
4. The method for preparing the carbon quantum dot according to claim 1, wherein the mass concentration of the coal powder in the coal water slurry is 2g/L to 30 g/L.
5. The method for producing a carbon quantum dot as claimed in claim 1, wherein the current density during the electrolytic oxidation reaction is 0.1A/cm2To 2A/cm2The electrolysis time is 0.5h to 10 h.
6. The method for producing carbon quantum dots according to any one of claims 1 to 5, wherein the raw material coal for producing the coal-water slurry is any one of lignite, subbituminous coal, bituminous coal and anthracite, and is pulverized to 100 mesh or more before use.
7. The method for preparing carbon quantum dots according to any one of claims 1 to 5, wherein the aqueous solution containing chloride ions is seawater, salt lake water or industrial wastewater containing chloride ions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010930531.6A CN112095113B (en) | 2020-09-07 | 2020-09-07 | Method for preparing carbon quantum dots by taking coal as raw material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010930531.6A CN112095113B (en) | 2020-09-07 | 2020-09-07 | Method for preparing carbon quantum dots by taking coal as raw material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112095113A true CN112095113A (en) | 2020-12-18 |
| CN112095113B CN112095113B (en) | 2023-08-01 |
Family
ID=73750714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010930531.6A Active CN112095113B (en) | 2020-09-07 | 2020-09-07 | Method for preparing carbon quantum dots by taking coal as raw material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112095113B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111925793A (en) * | 2020-09-07 | 2020-11-13 | 山西大学 | Preparation method of nitrogen and sulfur co-doped carbon quantum dots |
| CN113046767A (en) * | 2021-03-22 | 2021-06-29 | 华东交通大学 | Method for rapidly preparing graphene in batches |
| CN114852992A (en) * | 2022-02-09 | 2022-08-05 | 云南大学 | Method for separating and extracting carbon dots from smoke dust wastewater of thermal power plant |
| CN117587424A (en) * | 2024-01-19 | 2024-02-23 | 内蒙古工业大学 | Carbon quantum dot and preparation method and application thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110280793A1 (en) * | 2004-12-22 | 2011-11-17 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Carbon nanotube fibers/filaments formulated from metal nanoparticle catalyst and carbon source |
| WO2014179708A1 (en) * | 2013-05-02 | 2014-11-06 | William Marsh Rice University | Methods of producing graphene quantum dots from coal and coke |
| CN106757138A (en) * | 2016-11-25 | 2017-05-31 | 陕西盛迈石油有限公司 | The electrochemical preparation method of nitrogenous carbon quantum dot |
| CN106947475A (en) * | 2017-03-30 | 2017-07-14 | 皖西学院 | Al in fluorescent carbon quantum dot preparation method and its detection water3+Ion application |
| CN109437154A (en) * | 2018-10-25 | 2019-03-08 | 河南理工大学 | A method of the controllable carbon quantum dot of energy band is prepared by raw material of coal |
| CN109896948A (en) * | 2019-04-17 | 2019-06-18 | 太原理工大学 | A method of benzene carboxylic acid is prepared using middle low-order coal as raw material |
| CN110230127A (en) * | 2019-05-21 | 2019-09-13 | 湖南东映碳材料科技有限公司 | A kind of preparation method of high-performance intermediate phase pitch-based graphite fibre |
| CN111032568A (en) * | 2017-08-11 | 2020-04-17 | 徐海波 | Method and device for electrochemically preparing graphene oxide |
-
2020
- 2020-09-07 CN CN202010930531.6A patent/CN112095113B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110280793A1 (en) * | 2004-12-22 | 2011-11-17 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Carbon nanotube fibers/filaments formulated from metal nanoparticle catalyst and carbon source |
| WO2014179708A1 (en) * | 2013-05-02 | 2014-11-06 | William Marsh Rice University | Methods of producing graphene quantum dots from coal and coke |
| CN106757138A (en) * | 2016-11-25 | 2017-05-31 | 陕西盛迈石油有限公司 | The electrochemical preparation method of nitrogenous carbon quantum dot |
| CN106947475A (en) * | 2017-03-30 | 2017-07-14 | 皖西学院 | Al in fluorescent carbon quantum dot preparation method and its detection water3+Ion application |
| CN111032568A (en) * | 2017-08-11 | 2020-04-17 | 徐海波 | Method and device for electrochemically preparing graphene oxide |
| CN109437154A (en) * | 2018-10-25 | 2019-03-08 | 河南理工大学 | A method of the controllable carbon quantum dot of energy band is prepared by raw material of coal |
| CN109896948A (en) * | 2019-04-17 | 2019-06-18 | 太原理工大学 | A method of benzene carboxylic acid is prepared using middle low-order coal as raw material |
| CN110230127A (en) * | 2019-05-21 | 2019-09-13 | 湖南东映碳材料科技有限公司 | A kind of preparation method of high-performance intermediate phase pitch-based graphite fibre |
Non-Patent Citations (1)
| Title |
|---|
| 史传国;王亮;胡玉林;: "碳量子点的电化学制备", 广东化工, no. 22, pages 27 - 29 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111925793A (en) * | 2020-09-07 | 2020-11-13 | 山西大学 | Preparation method of nitrogen and sulfur co-doped carbon quantum dots |
| CN113046767A (en) * | 2021-03-22 | 2021-06-29 | 华东交通大学 | Method for rapidly preparing graphene in batches |
| CN114852992A (en) * | 2022-02-09 | 2022-08-05 | 云南大学 | Method for separating and extracting carbon dots from smoke dust wastewater of thermal power plant |
| CN117587424A (en) * | 2024-01-19 | 2024-02-23 | 内蒙古工业大学 | Carbon quantum dot and preparation method and application thereof |
| CN117587424B (en) * | 2024-01-19 | 2024-04-09 | 内蒙古工业大学 | Carbon quantum dot and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112095113B (en) | 2023-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112095113B (en) | Method for preparing carbon quantum dots by taking coal as raw material | |
| Abbas et al. | Biomass-waste derived graphene quantum dots and their applications | |
| US10807872B2 (en) | Graphene oxide quantum dot, material composed of same and graphene-like structure, and preparation method therefor | |
| US10655061B2 (en) | Process for the preparation of blue-flourescence emitting carbon dots (CDTS) from sub-bituminous tertiary high sulfur Indian coals | |
| WO2019128399A1 (en) | Biomass fluorescent carbon quantum dot and preparation method thereof | |
| CN106531977A (en) | Graphene oxide quantum dot and graphene composite electrode material and preparation method thereof | |
| KR20170070031A (en) | Graphene oxide prepared by electrochemically oxidizing and cutting end face of carbon-based three-dimensional material and method therefor | |
| CN108190877B (en) | Graphene oxide, preparation method and application | |
| Jo et al. | Gifts from nature: bio‐inspired materials for rechargeable secondary batteries | |
| KR20230084600A (en) | Production of graphene | |
| TW200909347A (en) | Cyclic process for the preparation of barium sulphate and lithium metal phosphate compounds | |
| CN115155543B (en) | Method for preparing magnetic magnesium-iron LDH-biochar composite material in one step and application | |
| Xue et al. | Sustainable and recyclable synthesis of porous carbon sheets from rice husks for energy storage: A strategy of comprehensive utilization | |
| Yang et al. | Fabrication of biomass-based functional carbon materials for energy conversion and storage | |
| GB2488825A (en) | Electrolytic exfoliation of graphite | |
| Lolupiman et al. | Electrodeposition of Zn/TiO 2 composite coatings for anode materials of Zinc ion battery | |
| CN107460503A (en) | The method that micro-nano copper powder is reclaimed from waste printed circuit board | |
| Abd Elkodous et al. | Cutting-edge development in waste-recycled nanomaterials for energy storage and conversion applications | |
| Hou et al. | Application of coal-based carbon dots for photocatalysis and energy storage: a minireview | |
| JPWO2008152680A1 (en) | Method for producing carbon nanosheet | |
| Paul et al. | New insight into the effect of oxygen vacancies on electrochemical performance of nickel-tin oxide/reduced graphene oxide composite for asymmetric supercapacitor | |
| CN111344252B (en) | Green method for extracting nano carbon polymorphous crystal mixture from coal | |
| Muraleedharan Pillai et al. | Biomass-based silicon and carbon for lithium-ion battery anodes | |
| CN109943327A (en) | A kind of synthetic method of S, N codope carbon dots | |
| CN1827266A (en) | Process for preparing nano nickel powder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |