141 results about "Graphitic carbon nitride" patented technology

There is disclosed a method of constructing a layered double hydroxide (LDH) material comprising selected metal ions, and employing metallic vanadium carbide (V2C) for promoting conductive properties of the LDH material, wherein the layered LDH material is a trimetallic LDH material. The trimetallic LDH material comprises selected Ni2+, Co2+, and A3+ metal ions with its cationic configuration for improving photocatalytic properties of the LDH material, wherein trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C)-based composite is coupled with a graphitic carbon nitride (g-C3N4) nanosheet, to form a hybrid-junction photocatalyst. Also disclosed is a layered structure of vanadium carbide (V2C) MXenes, comprising trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C) coupled with graphitic carbon nitride (g-C3N4), forming a NixCoyAlz LDH / g-C3N4 hybrid-junction photocatalyst.

A nanocomposite material including iron sulfide (FeS2) nanoparticles, iron oxide (α-Fe2O3) nanoparticles, titanium dioxide (TiO2) nanoparticles, and graphitic carbon nitride (C3N4) nanosheets and a method of its preparation. The nanocomposite is used in a method of forming oxygen gas from water using an applied voltage and photoirradiation, a method of forming hydrogen gas from water using an applied voltage and photoirradiation, and a method of photodegrading organic pollutants using visible light photoirradiation.

This invention provides a zinc-doped nickel selenide / graphite-phase carbon nitride composite photocatalyst and its preparation method. The method involves adding zinc acetate, nickel chloride hexahydrate, melamine, urea, pyrrole, and polyaniline to deionized water in a mass ratio of (0.5-1.5):(4-6):(4-10):(6-8):(0.125-0.2):(0.25-1) to obtain a mixed solution. The pH of the mixed solution is adjusted to 9-10, and the solution is then mixed thoroughly to obtain a precursor solution. The precipitate obtained after centrifuging the precursor solution is dried to obtain a precursor. The precursor and selenium source are then subjected to a two-stage calcination treatment under an inert atmosphere in a mass ratio of (1-10):(0.2-5). The first stage temperature is 450-600℃, and the second stage temperature is 300-400℃, to obtain the zinc-doped nickel selenide / graphite-phase carbon nitride composite photocatalyst. This invention can effectively increase the number of reactive sites in photocatalysts and expand the migration path of photogenerated carriers, thereby effectively reducing the recombination of photogenerated carriers in photocatalytic materials and fundamentally improving their photocatalytic hydrogen evolution efficiency.

The invention relates to the technical field of composite materials, in particular to a graphite carbon nitride catalytic membrane material and a preparation method and application thereof. The preparation method comprises the following steps: mixing melamine, a halogen source and water, drying, and carrying out heat treatment to obtain the halogen intercalation carbon nitride composite material; mixing the halogen intercalation carbon nitride composite material dispersion liquid with a metal salt solution, then adjusting the pH value to be alkaline, carrying out an in-situ coprecipitation reaction to obtain a metal oxide / halogen intercalation carbon nitride heterojunction, and carrying out vacuum calcination on the metal oxide / halogen intercalation carbon nitride heterojunction to obtain metal oxide / halogen intercalation carbon nitride heterojunction composite powder; mixing the metal oxide / halogen intercalation carbon nitride heterojunction composite powder, a polymer carrier and N, N-dimethylformamide to obtain a spinning solution, and performing electrostatic spinning to obtain a nascent fiber membrane; and calcining the nascent fiber membrane to obtain the graphite carbon nitride catalytic membrane material. The preparation method is high in operability, and the prepared material has the characteristics of stable structure and high catalytic efficiency.

An example method of upcycling plastic waste includes: providing plastic waste to be upcycled; applying an iron (Fe) single-atom catalyst to the plastic waste to be upcycled; and catalyzing, using the Fe single-atom catalyst, a reaction to upcycle the plastic waste to produce acetic acid. The Fe single-atom catalyst may include Fe atoms embedded on a graphitic carbon nitride (C3N4) support framework (Fe@C3N4 SAC). The Fe@C3N4 SAC may operate using a cascade photocatalytic reaction mechanism coupling Fenton and CO2 reduction reactions.

This invention provides a three-dimensional carbon nitride photocatalyst with an advanced structure, its preparation method, and its application, relating to the field of photocatalyst technology. The preparation method includes: obtaining graphitic carbon nitride through thermal condensation and nitrogen-rich precursor polymerization; mixing the graphitic carbon nitride in a polyphenol solution, then adding Tris-HCl solution dropwise and stirring to react, causing the polyphenols to polymerize in situ on the surface of the graphitic carbon nitride to form a polyphenol coating; separating and drying the coating to obtain a composite intermediate; mixing and grinding the composite intermediate with molten salt, then calcining it under a protective atmosphere at 400-650℃ to obtain the three-dimensional carbon nitride photocatalyst with an advanced structure. The preparation method provided by this invention is green and environmentally friendly, using readily available and inexpensive raw materials. Simultaneously, the reaction conditions are mild, requiring no template agent. The resulting catalyst has an advanced structure and exhibits extremely high photocatalytic activity for water splitting to produce hydrogen and excellent stability at room temperature and pressure, showing promising application prospects and economic benefits.

This invention discloses a cesium zirconate chloride / acid-modified carbon nitride heterojunction photocatalyst, its preparation method, and its application. Belonging to the field of photocatalytic materials technology, the cesium zirconate chloride / acid-modified carbon nitride heterojunction photocatalyst contains 10%-50% cesium zirconate chloride by molar percentage. The preparation method includes: adding zirconium chloride and tubular graphitic carbon nitride to hydrochloric acid and mixing them evenly to obtain precursor A; dissolving cesium chloride in hydrochloric acid to obtain precursor B; rapidly injecting precursor B into precursor A to rapidly generate a precipitate, which is then purified with methanol to obtain the target product. This invention improves the photocatalytic CO2 photoreduction efficiency by introducing an acid-modified carbon nitride and cesium zirconate chloride composite heterojunction structure. The tubular g-C3N4 can increase the specific surface area of ​​the material, providing more surface active sites; the surface protonation of acid-modified g-C3N4 can increase the polarization degree of g-C3N4, thereby significantly improving the photocatalytic performance and achieving the purpose of improving the photocatalytic activity of the composite material.

A method of inhibiting a cancer cell growth includes contacting the cancer cell with a Cu2(OH)3NO3 / CaSiO3@g-C3N4 nanocomposite material containing graphitic carbon nitride (g-C3N4), copper hydroxide nitrate (Cu2(OH)3NO3) and calcium silicate (CaSiO3), achieving an inhibition efficiency on human breast carcinoma (MCF-7) and human hepatocellular carcinoma (HepG-2) cell growth of greater than 95% in an in-vitro cellular viability assay.

A membrane including a polysulfone / polyethylene terephthalate (PSf / PET) support and an active layer on an outer surface of the PSf / PET support. The active layer comprises reacted units of a diacyl chloride compound, a tetra-amine compound, and a nanocomposite including graphitic carbon nitride and polypyrrole. The membrane of the present disclosure is self-cleaning following exposure to radiation and finds application in water decontamination and de-salination.

A particulate crystalline nanocomposite including: a monoclinic bismuth oxide (Bi2O3) crystalline phase; a calcium silicate (CaSiO3) crystalline phase; and, a graphitic carbon nitride (g-C3N4) crystalline phase, wherein at least a fraction of the g-C3N4 is in the form of mesoporous nanosheets.

This invention provides a carboxyl-functionalized g-C3N4-supported Cu-MOF catalyst, its preparation method, and its application, belonging to the field of photocatalytic materials technology. First, a carbon nitride precursor and a carboxylating agent are mixed in a solvent to undergo a carboxylation reaction, yielding carboxylated graphitic carbon nitride. Then, the carboxylated graphitic carbon nitride is mixed with a copper salt solution for a preliminary reaction, yielding copper-supported C3N4-C powder. Finally, the copper-supported C3N4-C powder and 1,3,5-pyromellitic acid are dispersed in a solvent for a hydrothermal reaction to obtain the carboxyl-functionalized g-C3N4-supported Cu-MOF catalyst. This invention, through directional assembly and growth, ultimately obtains a composite photocatalyst with tight interfacial bonding, stable structure, and high photogenerated charge separation efficiency.

This invention discloses an Fe-doped graphitic carbon nitride material with nitrogen defects, its preparation method, and application. Iron nitrate nonahydrate and 8-hydroxyquinoline are heated in a water bath, and after adjusting the pH, an inky iron ligand is precipitated. The iron ligand is then mixed with melamine and calcined in air to obtain a gray-black powder material, CN-Q-Fe. This material has great potential for treating antibiotic contamination in aquatic environments, and exhibits excellent photocatalytic degradation of tetracycline antibiotics.

The application provides a BiFeO3-graphitic carbon nitride photocatalyst and a preparation method and application thereof, relates to the field of photocatalysis technology, and the preparation method comprises the following steps: dissolving a bismuth source and an iron source in a solvent, mixing with a mineralizer, and performing a hydrothermal synthesis reaction to obtain BiFeO3; performing first calcination treatment on a nitrogen-containing organic precursor to obtain graphitic carbon nitride; and performing grinding treatment and second calcination treatment on the mixture of BiFeO3 and graphitic carbon nitride to obtain the BiFeO3-graphitic carbon nitride photocatalyst. The preparation method can construct a Z-type heterojunction at the interface of the separately prepared BiFeO3 and graphitic carbon nitride, form an internal electric field, efficiently separate photo-generated electrons and holes, effectively inhibit the recombination of the photo-generated electrons and holes, finally significantly enhance the redox capacity of the material, and make the material exhibit excellent photocatalytic performance, high selectivity and good cycle stability.

Disclosed are an anode for a lithium secondary battery, a lithium secondary battery including the anode, and a manufacturing method thereof. In particular, the anode includes a lithium metal layer and an interfacial layer made of phosphorous-doped graphitic carbon nitride and a single ion conducting polymer.

The present invention relates primarily to the use of graphitic carbon nitride containing at least one oxygen atom, as an active ingredient in paints, pigments, plastic fillers, active ingredients in cosmetics, and / or as a sunscreen, such as a UV A and / or UV B absorber. Graphitic carbon nitride can exhibit UV A and / or UV B absorption properties and a white to yellow color, and thus is useful as a UV absorber for various products requiring coloring properties and an attractive appearance.

GRAPHITICAL CARBON NITRIDE WITH METAL OXIDE AND PROCESS FOR PRODUCING ITSELF The present invention relates mainly to a process for preparing graphitic carbon nitride, comprising a step of heating at least one precursor compound with at least one metal oxide particle. The present invention also relates to a mixture product prepared by the process according to the present invention, comprising the graphitic carbon nitride and the metal oxide particle. Figure for the abstract: Figure 1

The application provides application of a graphite-phase carbon nitride photocatalyst loaded with platinum monomers and carbon dots in plastic hydrogen production, relates to the fields of material preparation and photocatalysis, and aims to solve the problem of low photocatalytic efficiency of photocatalysts. The preparation method comprises the following steps: taking urea as raw material, and preparing carbon nitride blocks by a modified thermal etching method; taking citric acid and urea as raw material, and preparing carbon dots by a thermal etching method; taking the carbon nitride blocks and the carbon dots as raw materials, and preparing carbon dot-graphite-phase carbon nitride composite materials by a thermal treatment method; and taking the carbon dot-graphite-phase carbon nitride composite materials and chloroplatinic acid as raw materials, and preparing the graphite-phase carbon nitride photocatalyst loaded with platinum monomers and carbon dots by a freeze photoreduction method. The graphite-phase carbon nitride photocatalyst loaded with platinum monomers and carbon dots prepared by the preparation method has high-activity platinum monomer hydrogen production sites and excellent light-generated electron transfer capacity, so that the photocatalytic hydrogen production efficiency is greatly improved.

The invention belongs to the technical field of photocatalysis, and relates to a copper oxide / carbon nitride S-type heterojunction photocatalyst as well as a preparation method and application thereof. The photocatalyst is of an S-shaped heterojunction structure obtained by compounding copper oxide and carbon nitride. The preparation method comprises the following steps: preparing graphite phase carbon nitride; preparing a copper oxide precursor; performing ultrasonic dispersion on the copper oxide precursor in deionized water, adding graphite phase carbon nitride, continuing ultrasonic dispersion, stirring until the color is uniform, and stopping the reaction; and carrying out suction filtration, washing and drying, heating at 500-550 DEG C for 2-3 hours, and fully grinding to obtain the copper oxide / carbon nitride S-type heterojunction photocatalyst. The copper oxide / carbon nitride S-type heterojunction material prepared by the invention can improve the efficiency of hydrogen production by photocatalytic decomposition of water.

The invention belongs to the technical field of environmental functional materials, and discloses a preparation method and application of a piezoelectric catalytic composite material for degrading pollutants. According to the scheme, stress dispersion, crack inhibition and efficient charge transmission are realized by in-situ construction of a nano aluminum oxide buffer layer with dual gradients of aperture and elasticity modulus between a piezoelectric substrate and a catalytic active component. The buffer layer is composed of a compact barrier layer, a transition layer and a porous surface layer, and 5-30 nm titanium dioxide or graphite phase carbon nitride is loaded as a catalytic component. The problem of catalyst stripping caused by interface stress concentration is solved, meanwhile, efficient charge transmission and high-density distribution of catalytic active sites are considered, and collaborative optimization of mechanical stability and electrochemical activity is achieved. According to the technical scheme, the performance bottleneck of an existing piezoelectric catalytic material in a dynamic service environment is broken through.

The present invention mainly relates to a process for preparing sub-micrometer-sized graphitic carbon nitrides, comprising a step of milling or sonicating graphitic carbon nitrides. The present invention also relates to a sub-micrometer-sized graphitic carbon nitride having a volume size distribution in which the particle size of less than 1 μm dominates more than 50% of a volume of total particles in the suspension.

The invention belongs to the technical field of air pollution prevention and control of photocatalytic materials, and particularly relates to a nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) respectively dissolving ammonium sulfate, bismuth nitrate and potassium bromide in water, mixing and transferring into polytetrafluoroethylene, and obtaining nitrogen-doped bismuth oxybromide by utilizing a hydrothermal method; 2) adopting a hydrothermal-assisted thermal polymerization method, obtaining a precursor through a melamine hydrothermal reaction, and performing nitrogen calcination to obtain tubular graphite-phase carbon nitride; 3) adding the mixed sample into methanol, and adopting a mechanical stirring method to obtain the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst. Due to the formation of the heterojunction, the activity of the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride in photocatalytic reduction of carbon dioxide can be greatly improved.

The invention relates to a phosphorus modified Ru-Rh-P-C3N4 catalyst as well as a preparation method and application of the phosphorus modified Ru-Rh-P-C3N4 catalyst. The catalyst is used for catalyzing MDA hydrogenation reaction to prepare H12MDA, and comprises a carrier and active components loaded on the carrier, the carrier is phosphorus modified graphite phase carbon nitride, and the active components contain ruthenium Ru and rhodium Rh. The preparation method of the catalyst comprises the following steps: 1) loading graphite-phase carbon nitride with ruthenium Ru to obtain Ru-g-C3N4, 2) dipping the graphite-phase carbon nitride in an aqueous solution of a phosphorus-containing compound and calcining the graphite-phase carbon nitride to obtain Ru-P-g-C3N4, and 3) loading rhodium Rh to obtain the catalyst.The catalyst is long in service life, excellent in stability and not easy to inactivate after long-time operation, and can improve the yield of an H12MDA target product and reduce the content of trans-isomers in the product.

The present invention discloses a graphite carbon nitride (GCN) with a pyridinic N content regulated by a magnetic field, as well as a preparation method and application thereof. The preparation method specifically uses formamide as a raw material and applies a magnetic field to conduct a solvothermal reaction. Beneficial effects: Formamide used in the present invention is a cheap and readily available chemical material. Graphite carbon nitride with a higher pyridinic N content and lower defects is constructed through a simple chemical reaction, effectively achieving high-value utilization of biomass resources. The resulting graphite carbon nitride with a higher pyridinic N content and lower defects exhibits enhanced chemical kinetics and tumor treatment effects.

The invention discloses graphite phase carbon nitride capable of emitting red light as well as a microwave preparation method and application thereof, and belongs to the technical field of preparation of fluorescent materials. The microwave preparation method of the graphite phase carbon nitride comprises the following steps: (1) adding water into a nitrogen-containing compound for synthesizing carbon nitride, and stirring until the nitrogen-containing compound is dissolved to form a nitrogen-containing compound solution; (2) adding inorganic salt of europium into the nitrogen-containing compound solution, and stirring until the inorganic salt is dissolved; (3) continuing to add the V main group metal / metalloid salt into the solution, and stirring until the V main group metal / metalloid salt is dissolved to obtain a mixed solution; and (4) adding inorganic acid into the mixed solution, uniformly mixing, putting the acid mixed solution into a microwave oven for microwave treatment, and then cooling to room temperature to obtain the graphite-phase carbon nitride capable of emitting red light. The rare earth metal Eu < 3 + > and V main group metal / metalloid ion double-doped graphite phase carbon nitride is excellent in fluorescence performance, good in dispersity and high in yield, more possibilities are provided for application of the graphite phase carbon nitride in the field of fluorescence sensing, and the graphite phase carbon nitride has good application prospects.

METHODS FOR REDUCING THE PARTICLE SIZE OF GRAPHITICAL CARBON NITRIDE The present invention relates primarily to a method for preparing submicrometer-sized graphitic carbon nitrides, comprising a step of grinding or sonicating the graphitic carbon nitrides. The present invention further relates to a submicrometer-sized graphitic carbon nitride having a volume size distribution in which particles smaller than 1 μm dominate more than 50% of the total particle volume in the suspension. Figure for the abstract: Figure 4

The invention relates to a method for colorimetric detection of KSCN by graphite-phase carbon nitride nano-enzyme in the technical field of detection. The method comprises the following steps: S1, preparing a standard detection solution: fully and uniformly mixing a buffer solution, graphite-phase carbon nitride nano-enzyme, H2O2, OPD and KSCN standard solutions with different concentrations for reaction; s2, preparing a blank detection solution: replacing the KSCN standard solution with distilled water, and preparing according to the same conditions. S3, drawing a standard curve: measuring the absorbance of the two solutions, establishing a quantitative relation between the absorbance and the KSCN concentration, drawing the curve and obtaining a regression equation. S4, detecting a to-be-detected sample: replacing the KSCN standard solution with the same amount of the to-be-detected sample solution, preparing a detection solution according to the same conditions, detecting the absorbance, and substituting the absorbance into the regression equation to obtain the concentration of the KSCN. The method has the advantages of being easy and convenient to operate, low in cost and short in consumed time.

A method of degrading organic contaminants disposed in an aqueous medium, the method including contacting the aqueous medium with a particulate crystalline nanocomposite and irradiating the aqueous medium with radiation having a wavelength of from about 100 to about 800 nm. The particulate crystalline nanocomposite includes: a monoclinic bismuth oxide (Bi2O3) crystalline phase; a calcium metasilicate (CaSiO3) crystalline phase; and, a graphitic-carbon nitride (g-C3N4) crystalline phase, wherein at least a fraction of the graphitic-C3N4 is in the form of mesoporous nanosheets.

This invention provides a novel method for preparing and applying a composite nanomaterial-modified organic membrane, belonging to the technical field of filtration membranes for wastewater treatment. The method involves adding a modified carbon nitride nanocomposite material (made from graphitic carbon nitride nanomaterials) and a pore-forming agent to an organic solvent, followed by ultrasonic treatment to obtain a mixed solution. Then, a polymeric membrane material is added to the mixed solution, and the mixture is stirred at a constant temperature and allowed to stand to remove bubbles, forming a casting solution. The prepared casting solution is then used to prepare the composite nanomaterial-modified organic membrane. This invention improves the hydrophilicity and dispersibility of C3N4 nanomaterials in the casting solution, accelerates the phase transformation rate of the composite membrane, increases the membrane porosity, increases the membrane's negative charge, and improves the membrane's antifouling performance. It also solves the problems of low flux and severe membrane fouling that exist in the operation of composite organic membranes.

A method of treating cancer cells includes contacting the cancer cells with a CoO / CaSiO3@g-C3N4 nanocomposite material. The CoO / CaSiO3@g-C3N4 nanocomposite material includes hexagonal metal oxide nanoparticles comprising a CoO phase and a CaSiO3 phase dispersed on a matrix of g-C3N4 nanosheets. The hexagonal metal oxide nanoparticles have an average particle diameter in a range from 340 to 440 nm. The CoO / CaSiO3@g-C3N4 nanocomposite material has a percent inhibition for Human Breast Carcinoma (MCF-7) cells at least 55% inhibition in an in-vitro cellular viability assay.

A carbon nitride film, wherein the thickness of the film is from 0.3 to 40nm. A product comprising substrate and the carbon nitride film, wherein the film is in contact with the substrate.