37 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.

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.

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.

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.

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.

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 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.

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.

This invention belongs to the field of materials chemistry and discloses a carbon nitride / cobalt oxide composite material, its preparation method, and its application in boron adsorption. The carbon nitride / cobalt oxide composite material comprises a three-dimensional porous framework composed of cobalt oxide nanoparticles and two-dimensional sheet-like graphitic carbon nitride material. The two-dimensional sheet-like graphitic carbon nitride material is dispersed and physically attached to the outer surface and / or internal channels of the three-dimensional porous framework, forming a physical contact interface. The carbon nitride / cobalt oxide composite material of this invention exhibits excellent boron adsorption capacity and selectivity.

This invention discloses a carbon nitride-supported noble metal catalyst, its preparation method, and its application, belonging to the technical field of preparation and application of supported noble metal catalysts. Using melamine as a precursor, graphitic carbon nitride (g-C3N4) support is obtained through high-temperature calcination and ultrasonic exfoliation. Noble metal palladium nanoparticles are then loaded onto the surface of g-C3N4 via an impregnation-reduction method to obtain a Pd / g-C3N4 catalyst. In the prepared catalyst, palladium nanoparticles are uniformly dispersed on the support surface, with an average particle size of approximately 3.2 nm, and the mesoporous structure of the support remains intact before and after loading. This invention features a simple preparation method, low noble metal usage, and high catalyst activity, exhibiting excellent catalytic performance in the hydrogenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran. Under reaction conditions of 150 °C, 1.5 MPa H2, and formic acid as the hydrogen donor, a 1% Pd / g-C3N4 catalyst can achieve complete HMF conversion, with a DMF selectivity of 95% and a conversion frequency of 362 h⁻¹. ‑1 Even after five cycles of use, it still maintains a conversion rate of 93% and a selectivity of 83%, showing good prospects for industrial application.

This invention discloses a molten salt modified rod-shaped graphitic carbon nitride material, its preparation method, and its applications. This rod-shaped graphitic carbon nitride material possesses a suitable defect structure and a rod-shaped microstructure. In water splitting hydrogen production performance tests, the hydrogen production performance of this catalyst is significantly improved compared to the original g-C3N4. The catalyst achieves a maximum hydrogen production rate of 1.75 mmol·g⁻¹ in photocatalytic water splitting experiments. ‑1 ·h ‑1 In the photocatalytic half-water splitting experiment with the addition of trace amounts of sacrificial agent, the rate of hydrogen production reached a maximum of 4.39 mmol·g. ‑1 ·h ‑1 It has a promising application prospect in the photocatalytic water splitting hydrogen production industry. Its preparation method has the advantages of simple materials, simple process, low cost and easy control, which is conducive to industrial application.

The present invention relates to a g-C3N4 polymer containing a graphitic carbon nitride repeating unit represented by chemical formula 1. The polymer can achieve excellent thermal and chemical stability, electrical properties, visible light absorption, porous structure, and ease of production of graphitic carbon nitride, and can have excellent water solubility and excellent solubility in organic solvents. [Chemical formula 1] In chemical formula 1, R1, L1, and ring A are as described in the specification.

This invention discloses an iron-carbon co-modified graphitic carbon nitride-based catalytic material, its preparation method, and its application. The invention involves dispersing melamine and acetamide in ethanol and stirring for 12 hours to obtain solution A; dispersing cyanuric acid and FeCl3·6H2O in ethanol and stirring for 12 hours to obtain solution B; mixing solutions A and B and stirring thoroughly; and then hydrothermally reacting the mixture at 180°C. The reaction product is washed until neutral, centrifuged, and dried to obtain a Fe / C-C3N4 precursor; the precursor is transferred to a tube furnace and calcined at 550°C for 2 hours to obtain the iron-carbon co-modified graphitic carbon nitride-based catalytic material. This catalytic material can be used for the photocatalytic degradation of antibiotic pollutants in water. This invention features a simple preparation process, low raw material costs, good environmental compatibility, and can efficiently and deeply purify antibiotic pollutants in water.

This invention belongs to the field of graphitic carbon nitride thin film technology, specifically disclosing a silver-sulfur co-doped graphitic carbon nitride denitrification thin film, its preparation method, and its application. The method includes the following steps: preparing a precursor mixture; placing the precursor mixture into a ceramic crucible, and covering the top of the ceramic crucible with fluorine-doped tin oxide glass; annealing the ceramic crucible covered with fluorine-doped tin oxide glass in a muffle furnace, and naturally cooling to room temperature to obtain the silver-sulfur co-doped graphitic carbon nitride denitrification thin film. This invention utilizes the above-mentioned silver-sulfur co-doped graphitic carbon nitride denitrification thin film, its preparation method, and its application. By proposing a metal-nonmetal co-doping strategy and employing the thermal vapor condensation (TVC) method, a silver-sulfur co-doped graphitic carbon nitride thin film with high photocatalytic activity is prepared, and its ability to degrade NO under light irradiation is confirmed. x The effectiveness of this technology can further promote the industrial application of graphitic carbon nitride films in the field of photocatalytic denitrification.

This invention belongs to the field of electrolyte materials technology, and relates to a modified sulfide solid electrolyte, its preparation method, and its application. The modified sulfide solid electrolyte comprises a sulfide electrolyte and sulfur-doped graphitic carbon nitride. The sulfide electrolyte at least partially coats the sulfur-doped graphitic carbon nitride, and the mass of the sulfur-doped graphitic carbon nitride is 1-8 wt% of the mass of the sulfide electrolyte. This invention controls the mass range of the graphitic carbon nitride precursor and the sulfur source, calcining to produce sulfur-doped graphitic carbon nitride with a wrinkled, sheet-like structure that is beneficial for coating the electrolyte surface. By controlling the amount of sulfur-doped graphitic carbon nitride, a modified sulfide solid electrolyte with good air stability and high ionic conductivity is obtained. Furthermore, the preparation method of this invention is simple, does not require complex high-temperature sintering equipment, and the reaction conditions are mild and controllable, making it suitable for large-scale industrial production.

This invention belongs to the field of photocatalytic algae removal technology, specifically relating to a nickel-containing carbon nitride-supported chalcopyrite composite material and its photocatalytic algae removal application. The invention first prepares g-C3N4 by high-temperature polymerization of a nitrogen-containing carbon-based precursor, then modifies it with nickel chloride to obtain Ni-g-C3N4. Subsequently, this is added to a precursor solution containing iron salts, copper salts, and thiourea. After hydrothermal reaction, the resulting product is calcined to obtain the nickel-containing carbon nitride-supported chalcopyrite composite material CuFeS2-Ni-g-C3N4. The nickel-containing graphitic carbon nitride-natural chalcopyrite in-situ coupled material synthesized in this invention is a photocatalytic material that combines highly efficient inactivation of Microcystis aeruginosa and degradation of algal toxins. It can directly utilize visible light such as sunlight to inactivate Microcystis aeruginosa and rapidly degrade algal toxins in flowing water, making it an environmentally friendly sterilization material with significant practical value.

An aluminum oxide-supported polypyrrole-modified oxidized graphitic carbon nitride (α-Al2O3@PPy / O-g-C3N4) membrane includes two layers: a first layer including alumina and a second layer including an oxidized graphitic carbon nitride and a polymerized pyrrole. The carboxylic groups and hydroxyl groups of the oxidized carbon nitride interact via electrostatic interactions with polar groups in the polymerized pyrrole. The second layer is a nanofibrous mass including entangled nanofibers. The second layer has a thickness in of 1 to 3 μm.

The application discloses a graphite carbon nitride-based Zn monatomic photocatalyst, and a preparation method and application of the photocatalyst.The graphite carbon nitride-based Zn monatomic photocatalyst is prepared by using thiourea and cyanuric acid as a nitrogen source and zinc hydroxide as a metal source through a one-step pyrolysis method.The prepared photocatalyst has better performance, lower preparation cost, simple steps and no solid or liquid waste in the synthesis process.Further, the catalyst has good degradation effect on phenol, and the highest degradation rate can reach 100%.

The invention belongs to the technical field of photocatalysis, and particularly relates to a graphite-phase carbon nitride photocatalyst based on a nitrogen-defect sulfur-doped coupled S-type homojunction as well as a preparation method and application of the graphite-phase carbon nitride photocatalyst. N-defect g-C3N4 (NA-DCN) and S-doped g-C3N4 (NA-SCN) are respectively constructed through nitric acid assisted treatment, and directed migration of photon-generated carriers is realized by using an S-type homojunction interface so as to inhibit recombination; stable interface bonding is formed through component proportion optimization, and the specific surface area and the number of active sites of the material are synchronously increased. Finally, through multi-dimensional structure regulation and control, the problems that the g-C3N4 is limited in photoresponse range, fast in carrier recombination and difficult in consideration of catalytic activity and stability are synchronously solved, the photocatalytic hydrogen production performance of the g-C3N4 is remarkably enhanced, and a reliable technical scheme is provided for large-scale application of an efficient carbon nitride-based photocatalytic material.

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 application provides a porous bismuth vanadate nanorod loaded sheet-shaped cobalt-doped graphite phase carbon nitride photoanode catalyst, a preparation method thereof and application thereof in the field of photoelectrocatalytic water splitting to produce hydrogen. A spin-coating and annealing process is used to tightly load Co:g-C3N4 nanosheets on the surface of porous BiVO4 nanorods, and the energy band structure of the Co:g-C3N4 nanosheet is regulated by adjusting the doping ratio of Co, and then a Co:g-C3N4 / BiVO4 heterojunction photoanode with good energy band matching is constructed. Among them, the ultrathin sheet-shaped Co:g-C3N4 has a more negative conduction band potential and a wider light absorption range than BiVO4, which is conducive to expanding the light response interval; and the energy band bending on the BiVO4 side helps to promote the directional transmission of photo-generated electrons to the photocathode. Based on the synergistic effect of the two materials, the heterojunction structure can shorten the carrier transmission path, promote the effective separation of photo-generated electron-hole pairs, and thus improve the photoelectrocatalytic water splitting to produce hydrogen performance. In addition, the preparation process is simple and clear in operation, and has potential for large-scale application.

This invention discloses a method for preparing a graphitic carbon nitride photocatalytic material co-modified with sodium ions, cyano groups, and pyrimidine groups, and its application in the degradation of tetracycline. The material uses graphitic carbon nitride as the main framework, and the modified material simultaneously contains sodium ions, cyano groups, and pyrimidine groups. The preparation method employs a two-step calcination process: first, melamine is calcined to obtain a melamine intermediate, which is then mixed with 2-aminopyrimidine and sodium chloride, ground, and subjected to a second high-temperature calcination. By optimizing its internal structure, this material significantly expands the light absorption range, reduces the recombination rate of photogenerated carriers, and achieves efficient generation of hydroxyl radicals under illumination. The preparation process of this material is simple, and it exhibits extremely excellent photocatalytic degradation efficiency for the antibiotic pollutant tetracycline, showing broad application prospects in the field of environmental remediation.

This invention belongs to the field of environmental pollution control technology, specifically relating to a method for photocatalytically enhanced peroxymonosulfate (PMS) aging of microplastics. The invention involves adding peroxymonosulfate and a photocatalytic enhancement catalyst to water containing microplastics, thereby conducting a photocatalytically enhanced degradation reaction to obtain aged microplastics. The photocatalytic enhancement catalyst comprises graphitic carbon nitride and silicon carbide supported on the surface of the graphitic carbon nitride. This invention achieves efficient aging of various microplastics under mild conditions through the synergistic effect of photocatalysis and PMS oxidation via the photocatalytic enhancement catalyst, while ensuring the cyclic stability and easy recyclability of the catalyst, providing a practical and feasible technical solution for the treatment of microplastic pollution in water bodies.

The invention pertains to a binary heterojunction photosensitizer composed of graphitic carbon nitride (gCN) and black phosphorus (BP) for use in photodynamic therapy (PDT) to treat retinoblastoma. The gCN / BP binary heterojunction nanosheets enhance light absorption and charge carrier separation, activated by near-infrared (NIR) light to generate reactive oxygen species (ROS), inducing apoptosis in cancer cells. The photosensitizer accumulates selectively in tumor tissues, minimizing damage to healthy cells, and addresses BP's stability in biological environments, offering a durable, non-invasive treatment for retinoblastoma.