78 results about "Graphitic carbon nitride" patented technology

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.

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.

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 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 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.

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 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.

This invention provides a permeable photocatalytic nano-antibacterial agent, its preparation method, and its application. The agent uses graphitic carbon nitride nanosheets as the core, with a molecular weight of 10 encapsulated on their surface. 3 ~10 7 The hyaluronic acid nanoparticles form nanostructures with a particle size of 200-400 nm. The nano-graphite phase carbon nitride, with its sharp-edged, sheet-like structure, can physically disrupt drug-resistant bacterial biofilms. Hyaluronic acid enhances the stability of the nano-antibacterial agent in the physiological environment and is degraded by hyaluronidase within the drug-resistant bacterial biofilm, thus disrupting the biofilm's structural stability and promoting efficient penetration and accumulation of the antibacterial agent within the biofilm. Under laser irradiation, the nano-graphite phase carbon nitride catalyzes the generation of reactive oxygen species, synergistically achieving efficient biofilm removal. This nano-antibacterial agent possesses excellent solution stability, biosafety, and photocatalytic activity, making it suitable for treating diseases related to drug-resistant bacterial biofilm infections.

GRAPHITICAL CARBON NITRIDE CONTAINING ONE OXYGEN ATOM AS A SUNSCREEN, PAINT, OR FILLER. The present invention relates primarily to the use of graphitic carbon nitride containing at least one oxygen atom as a paint active, pigment, plastic filler, cosmetic active, and / or sunscreen, such as a UVA and / or UVB absorber. Graphitic carbon nitride can exhibit UVA and / or UVB absorption properties and white to yellow color absorption, and is therefore useful as a UV absorber for various products requiring coloring properties and an attractive appearance. Figure for abstract: none

A method of water purification includes mixing contaminated water with a zirconium dioxide (ZrO2) / calcium silicate (CaSiO3) / graphitic carbon nitride (g-C3N4) based nanocomposite material to form a reaction mixture, further exposing the resultant reaction mixture to light, and removing the nanocomposite material to form purified water. The nanocomposite material consists of spherical metal oxide nanoparticles including a ZrO2 phase and a CaSiO3 phase dispersed on a matrix of g-C3N4 nanosheets, where the spherical metal oxide nanoparticles have an average particle diameter in a range from 2-25 nanometer (nm), and the nanocomposite material has a band gap energy in a range from 1.5-4 electron volt (eV).

This invention discloses a gasification slag-based composite phase multi-level porous photocatalytic material, its preparation method, and its applications. It belongs to the technical field of coal-based solid waste resource utilization and environmental pollution control. The preparation method of the gasification slag-based composite phase multi-level porous photocatalytic material includes: calcining a mixture of urea and melamine to obtain graphitic carbon nitride; mixing sodium hydroxide, water glass, and water, and aging the mixture to obtain an alkaline activation liquid; uniformly mixing gasification slag, graphitic carbon nitride, and the alkaline activation liquid to form a slurry; adding a foam stabilizer and a foaming agent to the slurry, and stirring to obtain a foamed slurry; casting the foamed slurry into a mold, curing, and then demolding to obtain a green body with a porous structure; placing the green body in an alkaline mother liquor for a hydrothermal reaction, followed by washing and drying to finally obtain the gasification slag-based composite phase multi-level porous photocatalytic material. The photocatalytic material prepared by this invention has good strength, is easy to separate and recover, and exhibits excellent adsorption and photocatalytic performance.

The invention relates to a preparation method and application of three-coordinate nitrogen vacancy graphite phase carbon nitride, and the method for preparing benzaldehyde by using the three-coordinate nitrogen vacancy graphite phase carbon nitride for photocatalytic oxygen oxidation of cinnamyl aldehyde comprises the following steps: adding the three-coordinate nitrogen vacancy graphite phase carbon nitride into cinnamyl aldehyde or a solvent solution of cinnamyl aldehyde; introducing oxygen, turning on a visible light source for irradiation, and vigorously stirring for reaction; and filtering the catalyst and separating benzaldehyde. The addition amount of the three-coordination nitrogen vacancy graphite phase carbon nitride is 1-30% of the mass of the cinnamyl aldehyde. Stirring in dark for 5-30 minutes before reaction, and keeping the reaction temperature at 25 + / -2 DEG C; the visible light source is a 300 W xenon lamp, lambda gt; the wavelength is 420 nm, and the optical power density is 200-500 mW / cm < 2 >. The three-coordination nitrogen vacancy graphite phase carbon nitride solves the bottleneck that unmodified graphite phase carbon nitride is insufficient in application activity, poor in stability and weak in interference resistance, and the three-coordination nitrogen vacancy graphite phase carbon nitride is hardly attenuated in catalytic activity after being recycled, obviously reduced in by-product content and small in reaction microenvironment change and selectivity fluctuation.

This invention discloses a parallel-interface engineered viologen-based defective carbon nitride composite material, its preparation method, and its applications, belonging to the field of energy catalysis and photochemical materials technology. The material comprises: a defective graphitic carbon nitride support; single-atom platinum catalytic sites supported on the support; and a selenium-containing viologen compound anchored by covalent bonds in a configuration parallel to the support surface. Through a bilateral covalent bonding strategy, viologen molecules are stably anchored in a parallel configuration to the single-atom platinum-modified defective carbon nitride surface, constructing a highly efficient and stable "electron bridge" structure, significantly enhancing interfacial bonding and photogenerated electron transport efficiency. This composite material exhibits excellent photocatalytic hydrogen evolution activity and efficient coupling ability with benzylamine oxidation under visible light, and its activity retention rate reaches over 92% after 144 hours of cycling. It provides a new paradigm for solving the problem of poor interfacial stability in photocatalysts and has significant application prospects in the field of solar fuel synthesis.

A porous CaV2O6 / CaSiO3 / g-C3N4 nanocomposite includes a calcium metavanadate (CaV2O6), a calcium silicate (CaSiO3) and a graphitic carbon nitride (g-C3N4) where the CaV2O6, the CaSiO3 and the g-C3N4 are present in a mass ratio of 0.8-1.2:0.8-1.2:0.8-1.2. The CaV2O6 and CaSiO3 present in the nanocomposite forms a structure of homogeneous nanowire and the g-C3N4 forms a structure of a nanosheets where the nanowires are homogeneously distributed between the nanosheets. A method to synthesize the nanocomposite.

The invention discloses a proton exchange membrane and a preparation method thereof and a fuel cell, and relates to the technical field of cells, the proton exchange membrane comprises an intermediate layer and a protective layer coating at least part of the surface of the intermediate layer, the intermediate layer comprises a sulfonated polyether ether ketone polymer, and the protective layer comprises a sulfonated polyether ether ketone polymer. The sulfonated polyether-ether-ketone polymer is doped with a metal organic framework material loaded with ionic liquid, and the protective layer comprises sulfonated graphite phase carbon nitride. The proton exchange membrane has high proton conductivity and excellent swelling resistance.

A method of absorption includes contacting a copper hydroxide nitrate / calcium silicate / graphite-phase carbon nitride [Cu2(OH)3NO3 / CaSiO3@g-C3N4] nanocomposite catalyst with a solution including one or more pollutants. Further, the method includes absorbing the one or more pollutants on the Cu2(OH)3NO3 / CaSiO3@g-C3N4 nanocomposite catalyst.

A photoautocatalytic heterogeneous catalyst for asymmetric aldol reaction and a preparation method thereof, the preparation method comprising the following steps: providing a carrier composed of graphene oxide and protonated phosphorus modified graphitic carbon nitride composite; and performing a photo-catalytic thiol-ene click chemistry reaction on the carrier and a thiol-substituted chiral amino acid to obtain the photoautocatalytic heterogeneous catalyst.

A method of water purification includes mixing contaminated water consisting of one or more pollutants with a CoO / CaSiO3@g-C3N4 nanocomposite material, adsorbing at least a portion of the one or more pollutants from the contaminated water, and further removing the nanocomposite material using filtration to form purified water. The nanocomposite material includes hexagonal metal oxide nanoparticles consisting of a CoO phase and a CaSiO3 phase dispersed on a matrix of g-C3N4 nanosheets where the hexagonal metal oxide nanoparticles have an average particle diameter in a range from 340 to 440 nanometer (nm) and the nanocomposite material has an absorption capacity for basic fuchsin of at least 20 milligram per gram (mg / g).

This invention provides a bimetallic framework-modified carbon nitride microsphere catalyst, its preparation method, and its application, belonging to the field of photocatalytic materials technology. First, g-C3N4 is mixed with concentrated nitric acid and concentrated sulfuric acid for oxidation treatment to obtain oxidized graphitic carbon nitride. Then, the oxidized graphitic carbon nitride, a mixed salt solution, and 1,3,5-benzenetricarboxylic acid are mixed and subjected to a hydrothermal reaction to obtain the bimetallic framework-modified carbon nitride microsphere catalyst. This invention effectively promotes the separation and transport of photogenerated electron-hole pairs through the bimetallic synergistic effect and the unique double S-type heterojunction structure, resulting in high hydrogen production efficiency. Under visible light irradiation, its photocatalytic hydrogen evolution rate can reach up to 14.79 mmol·g⁻¹. ‑1 ·h ‑1 It is 2.86 times that of the single-metal composite material CNO@CuMOF and 47 times that of pure CNO, significantly improving the photocatalytic hydrogen production activity.

This application relates to the field of graphitic carbon nitride photocatalyst technology, and discloses a coumarin-doped graphitic carbon nitride photocatalyst, its preparation method, and its application. The preparation method includes: dissolving dihydroxycoumarin in anhydrous ethanol, ultrasonically dispersing it to obtain a homogeneous solution; mixing the homogeneous solution with urea, and drying it at low temperature to obtain a precursor; grinding the precursor and then calcining it at high temperature to obtain a CM-CN photocatalyst; and subjecting the CM-CN photocatalyst to static oxidation to obtain a coumarin-doped graphitic carbon nitride photocatalyst. This application innovatively proposes a CM-CN-AO photocatalyst prepared by modifying coumarin combined with a unique "oxidation enhancement" process, using urea as a carbon nitride precursor. Through a mild oxidation process under long-term static placement in air, a quinone structure is generated, optimizing its surface electronic structure and increasing photocatalytic active sites, thereby achieving a significant improvement in hydrogen production performance and breaking through the performance limitations of traditional carbon-nitrogen materials.

A system for the synthesis and production of a cermolybdate graphitic carbon nitride (Ce2 (Mo4)3@g-C3N4) nanocomposite for the detection of uric acid in sweat, comprising: a) a cermolybdate synthesis unit for the production of Ce2 (Mo4)3 nanoparticles by hydrothermal treatment, wherein the cermolybdate synthesis unit comprises: • a reaction vessel containing cerium nitrate and ammonium molybdate in a molar ratio of 2:3 in a solvent mixture of ethanol and deionized water, • a surfactant additive system configured to add cetyltrimethylammonium bromide (CTAB) for stabilization, and • a hydrothermal reactor configured to heat the mixture to 180°C for 24 hours; b) a plant for the synthesis of graphitic carbon nitride, configured to produce g-C3N4 by thermal polymerization of melamine under inert atmospheric conditions at temperatures of 400 °C to 600 °C; and c) a nanocomposite formation unit configured to combine Ce2(Mo4)3 and g-C3N4 to form the Ce2(Mo4)3@g-C3N4 nanocomposite, wherein the nanocomposite formation unit comprises: • an ultrasound system configured to disperse the components at the molecular level and allow them to interact with each other, and • a drying system for removing residual solvents.