616 results about "Carbon nitride" patented technology

The invention discloses a carbon nitride-based composite material as well as a preparation method and application thereof. The carbon nitride-based composite material comprises a non-metal doped carbon nitride carrier and a noble metal, wherein the noble metal exists in the carrier in an element doping form and / or is loaded on the carrier in an oxide form; the precious metal is one or more of Pt, Pd, Au and Ru, and the nonmetal is one or more of P, S and I. According to the carbon nitride composite material disclosed by the invention, noble metal is utilized to modify carbon nitride, the number of surface active sites is increased, the electron and chemical structures of an active center are adjusted, and meanwhile, generation and migration of photo-generated charges are promoted. Meanwhile, the surface of the carbon nitride composite material is modified by non-metallic elements, so that adsorption and activation of reactant H2O molecules are effectively promoted. The catalyst disclosed by the invention is simple in preparation process, good in repeatability and easy for large-scale production.

The invention is suitable for the technical field of photocatalyst preparation, and provides a modified tubular g-C3N4 loaded Ni-CoP photocatalyst and a preparation method thereof. The preparation method comprises the following steps: calcining a carbon nitride precursor in stages to obtain tubular carbon nitride, stirring the tubular carbon nitride with a cobalt and nickel-containing compound and an alkaline compound, washing and drying to obtain a precipitate, calcining, mixing and grinding with a phosphorus-containing compound, calcining again, and modifying the product with polydopamine and polypyrrole to obtain the composite material. The photocatalyst modified by the polydopamine and the polypyrrole and loaded with the Ni-CoP by taking the tubular g-C3N4 as the carrier is obtained. According to the invention, three-in-one synergistic integration of'carrier-modifier-cocatalyst 'is realized, the prepared photocatalyst still keeps tubular morphology and has a larger specific surface area, the requirements of anode oxygen evolution reaction (OER) on rapid charge separation and transmission can be met, meanwhile, the light absorption range is widened, the solar energy utilization rate is increased, and a foundation is laid for efficient OER reaction.

The invention relates to the technical field of electrode paste, in particular to electrode paste for a submerged arc furnace and a preparation method of the electrode paste. Comprising three-level grain size distribution anthracite aggregate which is electrically calcined at high temperature and modified by a KH-550 silane coupling agent, a modified silicon carbide whisker and boron-doped graphene-like carbon nitride composite filler, a maleic anhydride-mediated compatible medium-temperature pitch-polyborosiloxane binder and a graphite powder-borax functional additive. A step-by-step mixing and two-stage sintering process is adopted in the preparation process, a covalent bond interface bridging structure is constructed through the coupling agent, the composite dispersing agent regulates and controls the multi-dimensional network distribution of the filler, and the process synergistically improves the compactness and the interface bonding force of the green body. The electrode paste is firm in interface bonding, can form a ceramic protective phase at a high temperature, has excellent conductivity and mechanical strength, and prolongs the service life of the electrode paste for the submerged arc furnace.

The invention provides an oxygen vacancy defect carbon nitride anchored iron atom cluster catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. Iron atoms are anchored in a carbon nitride (Ov-C3N4) structure containing oxygen vacancy defects in a cluster form, and Fe-Ov-C defect bonds are formed between the oxygen vacancy defects in C3N4 and iron atom clusters to stabilize the iron atom clusters, so that the problem of thermodynamic instability of the catalyst is solved while higher atom utilization efficiency is obtained; the Fe-Ov-C defect bond atoms can reasonably regulate and control the electronic structure of the center of an iron cluster d band, so that the catalytic activity and the cycling stability are greatly enhanced; besides, iron atom clusters and persulfate act to cause O-O bond breakage, non-free radical singlet oxygen is formed, and the problem that the catalytic efficiency is sharply reduced due to free radical annihilation in a complex water environment can be effectively solved.

The invention relates to an epoxy resin composite insulating material and a preparation method and application thereof, and belongs to the technical field of insulator equipment. The epoxy resin composite insulating material is prepared from the following raw materials: epoxy resin, nano filler, a surface modifier, aluminum oxide particles, a flame retardant, an organic solvent, a curing agent and an accelerant. The nanofiller is at least one of the following nanoscale materials: titanium dioxide, graphene oxide, carbon nitride, zinc oxide, boron nitride and silicon dioxide; the surface modifier is a silane coupling agent and is used for surface modification of the nano filler; the flame retardant is at least one of a phosphorus flame retardant, a nitrogen-phosphorus synergistic flame retardant and a brominated flame retardant. The insulating material provided by the invention has high thermal stability, high insulativity and carbon precipitation inhibition capability, can effectively inhibit carbon precipitation of epoxy resin under the action of thermal and electric stress, and has good comprehensive performance.

The invention discloses a high-barrier degradable vegetable and fruit preservative film based on multi-layer compounding and a preparation method thereof, belongs to the technical field of food packaging materials, and aims to solve the technical problem that the barrier property, the mechanical property and the antibacterial property of the degradable vegetable and fruit preservative film in the prior art need to be further improved. The degradable vegetable and fruit preservative film comprises a first layer, a second layer and a third layer which are sequentially laminated, and the first layer is prepared from, by weight, 65-75 parts of polylactic acid, 4-8 parts of maleic anhydride grafted polylactic acid, 2-4 parts of modified carbon nitride, 1-3 parts of alizarin microcapsules, 3-6 parts of modified lignin and 1-2 parts of auxiliary additives; through the synergistic effect of the modified carbon nitride, the alizarin microcapsules and the modified lignin, the barrier property, the mechanical property and the antibacterial property of the degradable vegetable and fruit preservative film are further improved.

The invention discloses a preparation method of a graphite phase carbon nitride / titanium dioxide photo-anode based on carbon dot modification. The preparation method comprises the following steps: firstly, preparing graphite-phase carbon nitride and a carbon dot diluent, adding the graphite-phase carbon nitride and the carbon dot diluent into a precursor solution of titanium dioxide, dispersing and fusing, and growing a composite photocatalyst on conductive glass through in-situ hydrothermal treatment to obtain the photo-anode. The optimal material ratio is analyzed through characterization means such as electrochemical test and ultraviolet diffuse reflection spectrum. The optimal reaction condition of the photo-anode is explored by constructing the double-electrode photocatalytic fuel cell.

The invention provides a hybrid bionic nano delivery system and a preparation method thereof. The hybrid bionic nano delivery system is composed of a carbon dot doped nitrogen carbide-based nanoparticle core and a cell membrane group wrapping the nitrogen carbide-based nanoparticle core. The invention constructs a hybrid bionic nano delivery system, which has good biocompatibility and biological metabolism, is beneficial to application in the field of biomedicine, and can realize low-temperature photothermal therapy of hepatic fibrosis. The carbon nitride-based nano bionic system constructed by the invention is mainly synthesized by high-temperature calcination, ultrasonic treatment and hybrid cell membrane wrapping. The preparation method disclosed by the invention is simple, has good repeatability and has a relatively good industrial production prospect.

The application discloses a carbon nitride / carbon felt electrode for a vanadium redox flow battery and a preparation method thereof, and belongs to the technical field of battery materials. The preparation method comprises the following steps: (1) soaking carbon felt in an ethanol solution containing an iron salt compound and then drying; (2) suspending the dried carbon felt in a closed container, adding a pyrrole monomer, and reacting at a constant temperature under an inert atmosphere to obtain a polypyrrole / carbon felt, which is cleaned and dried; (3) soaking the polypyrrole / carbon felt in an ethanol solution containing a zinc salt compound and then drying; (4) gradually increasing the temperature of the dried polypyrrole / carbon felt under an inert atmosphere to perform high-temperature carbonization, and obtaining carbon nitride / carbon felt; and (5) performing pickling and water washing on the carbon nitride / carbon felt, and obtaining the carbon nitride / carbon felt electrode after drying. In the application, the iron salt is used to catalyze the polymerization and deposition of pyrrole on the surface of the carbon felt, and finally high-temperature carbonization is performed to form various nitrogen-doped structures on the surface of the carbon felt, so that the liquid affinity and the electrochemical reaction activity of the electrode surface are significantly improved, and the energy efficiency of the battery is improved.

The invention belongs to the technical field of development and manufacturing of solid-state electrolyte materials and solid-state lithium batteries, and particularly relates to an all-solid-state oxide-polymer electrolyte membrane as well as a preparation method and application thereof. The electrolyte membrane comprises a polymer matrix, a lithium salt, butanedinitrile, lithium lanthanum zirconium tantalum oxide and graphite phase carbon nitride, the polymer matrix, the lithium salt, the butanedinitrile, the lithium lanthanum zirconium tantalum oxide and the graphite phase carbon nitride are uniformly mixed to form a solid film; the polymer matrix is polyacrylonitrile and forms a framework of the electrolyte membrane; the lithium salt, the butanedinitrile, the lithium lanthanum zirconium tantalum oxide and the graphite phase carbon nitride are at least physically and uniformly dispersed in the polymer matrix. The electrolyte membrane can be prepared through the steps of slurry preparation, defoaming treatment, membrane forming processing, drying and curing and the like, and can be used in a solid-state lithium battery, so that the contact between the electrolyte membrane and an electrode interface is improved, side reaction is inhibited, the ion transmission efficiency and mechanical property are improved, the interface impedance is reduced, and the cycling stability and safety of the solid-state lithium battery are enhanced.

The invention provides a high-stability electron transport layer and a perovskite solar cell. A preparation method of the electron transport layer comprises the following steps: evaporating a layer of fullerene (C60) on a substrate on which a hole transport layer and a perovskite thin film layer are prepared; a layer of graphite-like phase carbon nitride (g-C3N4) is spin-coated on the C60; and finally, depositing a layer of tin oxide (ALD-SnO2) by utilizing atomic layer deposition. The g-C3N4 has good electrical conductivity, not only can fill some gaps between C60 and ALD-SnO2, but also can interact with C60 and ALD-SnO2, so that the C60 and ALD-SnO2 are attached more tightly, and the interface stability is improved. The prepared high-stability electron transport layer is applied to a perovskite solar cell device, and the stability of a perovskite solar cell is remarkably improved.

The invention relates to a silver-iron diatom modified carbon nitride (AgFe-CN) photocatalytic material capable of synchronously removing organic pollutants and pathogenic bacteria as well as a preparation method and application of the silver-iron diatom modified carbon nitride (AgFe-CN) photocatalytic material, and belongs to the field of environmental chemistry and material science. The catalyst is prepared through a supramolecular coordination-thermal polymerization method, wherein silver and iron are highly dispersed on a porous carbon nitride substrate in a monatomic form. The monatomic Ag and Fe synergistically construct an electron channel, and jointly endow the catalyst with excellent photocatalytic activity. The preparation method comprises the following steps: combining the catalyst with peroxymonosulfate (PMS) to construct an AgFe-CN / PMS / Vis photocatalytic Fenton-like synergistic system; in the system, the catalyst can lead generation of an advanced oxidation system which takes singlet oxygen as a main component and cooperates with superoxide free radicals and high-valence iron oxygen species, so that efficient and synchronous removal of various organic pollutants and pathogenic microorganisms in the water body is realized. The catalyst is simple in preparation process and mild in condition, and the constructed water treatment method is high in efficiency, high in universality and good in stability and has wide application prospects.

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.

The invention discloses a carbon-coated zinc oxide / carbon nitride heterojunction photocatalyst as well as a preparation method and application thereof. The carbon-coated zinc oxide / carbon nitride heterojunction photocatalyst is formed by crosslinking a carbon-coated zinc oxide nanosheet and a carbon nitride nanosheet through a carbon layer, and a heterojunction is formed between the carbon-coated zinc oxide nanosheet and the carbon nitride nanosheet. The preparation method comprises the following steps: mixing and grinding a carbon-coated zinc oxide nano-material and a carbon nitride nano-sheet, and calcining in a protective atmosphere. The carbon-coated zinc oxide / carbon nitride heterojunction photocatalyst can effectively promote photon-generated carrier separation, reduce the recombination rate of electron-hole pairs, and significantly improve the efficiency of photocatalytic production of hydrogen peroxide in an air atmosphere. Meanwhile, hydrogen peroxide generated in situ can react with bicarbonate in the system to generate peroxybicarbonate with high oxidation activity, and active oxygen species such as hydroxyl radicals are generated through activation in the photocatalytic process, so that the degradation capacity on the organic pollutants is further enhanced, and efficient degradation of the organic pollutants is realized.

The invention provides a phosphorus-nickel co-doped carbon nitride composite material for photocatalytic-Fenton degradation of pollutants and a preparation method and application thereof, and the preparation method comprises the following steps: in a muffle furnace, heating urea and ammonium dihydrogen phosphate to convert into phosphorus-doped carbon nitride; the preparation method comprises the following steps: dissolving phosphorus-doped carbon nitride in absolute ethyl alcohol, adding an anhydrous nickel chloride aqueous solution, carrying out ultrasonic treatment, drying, placing in a muffle furnace, and carrying out high-temperature heating conversion to obtain the phosphorus-nickel co-doped carbon nitride composite material. According to the metal monatomic catalyst synthesized by adopting a specific preparation method, the yield of photo-generated hydrogen peroxide is selectively improved while separation and transfer of photo-generated carriers are synergistically promoted by two sites; and the iron circulation can be well promoted, so that the photocatalytic-Fenton pollutant degradation effect which is comparable with that of precious metal doping is realized.

The invention discloses a semiconductor device and a manufacturing method thereof. A semiconductor device includes a plurality of memory cells, each memory cell including: a memory layer; a first selector layer formed in an upper portion or a lower portion of the memory layer to select the memory layer; a second selector layer for selecting a memory layer; and an interface layer disposed between the first selector layer and the second selector layer, in which the first selector layer and the second selector layer include an amorphous silicon layer including one or more dopants selected from the group including Group 13 elements, Group 14 elements, and Group 15 elements of the periodic table, and wherein the interface layer is selected from the group comprising silicon oxide, silicon carbonitride, silicon carbonitride, silicon nitride, tantalum nitride, titanium nitride, aluminum nitride, and hafnium nitride.

The invention relates to modified nitrogen-rich carbon nitride as well as a preparation method and photocatalytic application thereof. The preparation method comprises the following steps: mixing nitrogen-rich carbon nitride and fused salt, and performing secondary calcination to obtain an intermediate; the secondary calcining temperature is 550 DEG C to 600 DEG C; the fused salt comprises a potassium source; and washing and drying the intermediate to obtain the modified nitrogen-rich carbon nitride. According to the invention, potassium ion doping modification is carried out in nitrogen-rich carbon nitride, so that the nitrogen-rich carbon nitride has stronger photon-generated carrier separation and transmission capability because the internal transmission resistance is reduced due to high crystallinity of KC3N5 and K < + > is successfully introduced to serve as a transmission channel for interlayer electron transfer, after introduction of K < + >, Eb of C3N5 is significantly reduced, exciton dissociation and generation of photon-generated carriers are facilitated, and the performance of the material is improved. The effect of producing H2O2 through photocatalysis of the KC3N5 is enhanced; when the photocatalyst is applied to photocatalytic production of H2O2, the production rate of H2O2 can reach up to 117 times of that of C3N5, and the photocatalyst has excellent photocatalytic stability, can efficiently produce H2O2 in a wide pH range, and is suitable for various complex water substrates to remarkably improve the production rate of H2O2.

The invention relates to the field of adsorption materials, in particular to a discrete carbon-based biological base material for targeted treatment of high-concentration organic wastewater and a preparation process thereof.The discrete carbon-based biological base material is prepared from, by weight, 65-70 parts of activated carbon fibers, 8-10 parts of PLA fibers, 5-7 parts of sodium lignin sulfonate, 5-8 parts of ferroferric oxide magnetic particles and 8-10 parts of a carbon nitride catalyst; biPO4 is doped in the carbon nitride catalyst. According to the discrete carbon-based biological base material, the activated carbon fibers rapidly adsorb organic matters in high-concentration wastewater, the PLA releases a carbon source and accelerates formation of a biological membrane, and the biological membrane is degraded by taking the adsorbed organic matters as a substrate; the carbon nitride catalyst generates active oxygen under visible light to oxidize small molecular acid, and ferroferric oxide magnetic particles catalyze the reaction to break refractory toxins (such as antibiotics); after the reaction, the magnetic field recovers the material, sodium lignin sulfonate protects ferroferric oxide magnetic particles from corrosion, and regeneration performance is provided.

The invention provides a bismuth ferrite-graphite phase carbon nitride photocatalyst and a preparation method and application thereof, and relates to the technical field of photocatalysis, the preparation method comprises the following steps: dissolving a bismuth source and an iron source in a solvent, mixing with a mineralizing agent, and carrying out a hydrothermal synthesis reaction to obtain bismuth ferrite; performing first roasting treatment on the nitrogen-containing organic matter precursor to obtain graphite-phase carbon nitride; and mixing bismuth ferrite and graphite phase carbon nitride, and carrying out grinding treatment and second roasting treatment to obtain the bismuth ferrite-graphite phase carbon nitride photocatalyst. According to the preparation method, bismuth ferrite and graphite-phase carbon nitride which are prepared respectively are compounded, a Z-type heterojunction can be constructed at an interface of the bismuth ferrite and the graphite-phase carbon nitride, an internal electric field is formed, so that photo-induced electrons and holes are efficiently separated, compounding of the photo-induced electrons and the holes is effectively inhibited, and finally the oxidation-reduction capacity of the material is remarkably enhanced; therefore, the photocatalyst shows excellent photocatalytic performance, high selectivity and good cycle stability.

The invention relates to an S-doped g-C3N4 coated modified graphite material, a preparation method thereof and a lithium ion battery negative electrode. The method comprises the following steps: mixing a g-C3N4 precursor with a sulfur source, and then carrying out heat treatment under the condition of shielding gas to obtain sulfur-doped graphite phase carbon nitride S-g-C3N4; carrying out plasma modification treatment on the surface of the graphite material by adopting plasma reaction gas to obtain modified graphite; mixing S-g-C3N4 with the modified graphite to obtain a mixed material; and calcining the mixed material in a protective gas environment to obtain the S-doped g-C3N4 coated modified graphite material. The invention also provides the graphite material prepared by the method and a lithium ion battery negative electrode prepared from the graphite material. The graphite material has relatively high conductivity, interface compatibility and structural stability.

The invention belongs to the technical field of metal materials, and particularly relates to a method for synergistically inhibiting residual elements from deteriorating the performance of ultrathin steel through microalloying. According to the invention, trace amounts of Nb, Ti and other strong carbonitride forming elements are added, and 0.008%-0.012% of precise S is added, so that the elements are matched with Ti to form Ti4S2C2 composite inclusions, and the phase can keep stable form in the rolling process and is prevented from being stretched along the rolling direction, thereby effectively inhibiting harmful segregation of residual elements at the grain boundary, and improving the quality of the product. The high-strength, high-toughness, high-conductivity and low-loss performance of the material are improved, and a material basis is provided for promoting high-quality development of 5G infrastructures.

The invention belongs to the technical field of photocatalysis and environmental governance, and particularly relates to a composite photocatalyst, in particular to a graphite-phase carbon nitride / molybdenum trioxide composite photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: S1, dispersing ammonium heptamolybdate in deionized water, adjusting the pH value of the solution to 0.5 + / -0.3 by using sulfuric acid, stirring and centrifuging the formed system, and carrying out vacuum drying to obtain a molybdic acid precursor; s2, mixing melamine and the molybdic acid precursor, calcining the formed mixture, and naturally cooling to room temperature after calcining is finished, so as to obtain the composite photocatalyst. Tests prove that the prepared catalyst has excellent cycling stability, still keeps high catalytic activity after being recycled for multiple times, and has a good industrial application prospect.

The application discloses oligomerization degree carbon nitride nanosheet containing partial supramolecular chains and a preparation method and application of photocatalytic decomposition of water to simultaneously produce hydrogen and oxygen, and the preparation method comprises the following steps: adding melamine and cyanuric acid into a solvent, stirring after ultrasonic treatment, and drying to obtain supramolecular precursor powder; and calcining the supramolecular precursor powder to obtain oligomerization degree carbon nitride containing partial supramolecular chains. The application retains partial supramolecular oxygen-containing structures to optimize adsorption and dissociation of oligomerization degree carbon nitride nanosheet and water molecules at a reaction liquid interface, realizes high H and OH enrichment of a local environment, and promotes performance improvement of photocatalytic complete decomposition of water.

The application discloses a carbon nitride-based photocatalyst suitable for complex water environment and a preparation method and application of the photocatalyst in photocatalytic H2O2 production. The application belongs to the field of photocatalysis. The application aims to solve the technical problem of high production cost and narrow application range of the existing photocatalytic H2O2 production method which depends on organic sacrificial agent, pure O2 and deionized water. The photocatalyst is composed of carbon nitride nanosheets and Ni-Ag nanoparticles uniformly loaded on the surface of the nanosheets. The method comprises the following steps: mixing a water dispersion of carbon nitride nanosheets with a Ni(NO3)2.6H2O solution and an AgNO3 solution, stirring and reacting in the dark, then adding a NaBH4 solution drop by drop, continuously stirring and reacting in the dark, centrifuging, washing and drying to obtain the carbon nitride-based photocatalyst. The photocatalyst prepared by the application exhibits excellent catalytic performance in deionized water or tap water without adding an organic sacrificial agent and without additionally introducing O2. The photocatalyst is used for photocatalytic water H2O2 production.

The invention relates to the technical field of photocatalytic materials, in particular to a metal single atom loaded defect carbon nitride catalyst and a preparation method and application thereof. The method comprises the following steps: by taking melamine as a nitrogen source, soluble metal salt as a metal source and ethylenediaminetetraacetic acid as a chelating agent, carrying out freeze drying in a solvent system, calcining in a protective atmosphere, and carrying out thermal polymerization, so as to obtain the metal single atom loaded defective carbon nitride catalyst. The metal in the soluble metal salt is copper, iron or manganese. Precise anchoring and high dispersion of metal ions are achieved through complexing of ethylenediamine tetraacetic acid, a stable metal-N coordination structure is formed, metal agglomeration is avoided, a defect structure is constructed synchronously, and the metal monatomic loading capacity is 1 wt.%-7 wt.%. The catalyst can efficiently catalyze and activate peroxymonosulfate and rapidly degrade antibiotic pollutants such as tetracycline, has the advantages of being low in preparation cost, environmentally friendly, high in catalytic activity and high in stability, and is suitable for the field of water pollution remediation.

The application relates to the technical field of electrodes of all-vanadium redox flow batteries, and discloses a composite catalyst modified graphite felt electrode and a preparation method and application thereof, which comprises the following steps: preparing carbon-nitrogen doped cerium oxide; preparing graphite phase carbon nitride; loading the composite catalyst on the graphite felt through an adhesive and carrying out high-temperature calcination to prepare a loaded composite catalyst graphite felt electrode. The graphite phase carbon nitride and the carbon-nitrogen doped cerium oxide are used to modify the graphite felt electrode, the synergistic effect of carbon-nitrogen doping not only improves the electronic conductivity and structural stability of the metal oxide, but also enhances the hydrophilicity, and the voltage efficiency, the discharge capacity and the cycle stability of the vanadium battery are improved.

The invention belongs to the technical field of reverse osmosis membranes, and relates to a visible-light-responsive carbon nitride / zinc oxide heterojunction modified reverse osmosis membrane and a preparation method thereof.The method specifically comprises the steps that porous ultrathin carbon nitride nanosheets are prepared; synthesizing zinc oxide nanoparticles rich in oxygen vacancies; and compounding the two to form the Z-type heterojunction photocatalyst. The heterojunction is stably loaded in a polyamide separation layer through an interfacial polymerization process, the composite reverse osmosis membrane is prepared, and the membrane disclosed by the invention has a remarkable visible light response characteristic while maintaining a high desalination rate. The method has the core advantages that the visible light utilization rate and the photo-generated charge separation efficiency are remarkably improved through the construction of the heterojunction, so that the membrane can actively and efficiently degrade organic pollutants under illumination, self-cleaning is realized, the anti-pollution capacity is greatly improved, and the chemical cleaning period is greatly prolonged.

The invention provides a nitrogen-vacancy carbon nitride / indium oxide heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysts. The nitrogen vacancy carbon nitride is used as a framework of the catalyst, and the charge distribution of the carbon nitride can be adjusted by nitrogen vacancy defects, so that the carrier migration rate and the surface active site abundance are improved; the nitrogen vacancy also changes the charge recombination mode of the carbon nitride, the energy band structure of the carbon nitride is beneficially adjusted, the photovoltaic performance of the carbon nitride is improved, the visible light response range of the carbon nitride is widened, and the photocatalytic performance of the carbon nitride is remarkably improved; indium oxide is introduced to form a heterojunction with nitrogen vacancy carbon nitride, so that electron-hole recombination can be inhibited, a new electron transmission channel is generated, and the carrier transmission rate is increased; the band gap characteristic of indium oxide is consistent with the band gap characteristic of nitrogen vacancy carbon nitride, so that the photocurrent response intensity of the catalyst can be improved, the charge transfer resistance is reduced, and the photocatalytic performance is synergistically enhanced.

The present invention relates to a Ru-Ni bimetallic catalyst for the selective hydrogenation of a quinoline organic hydrogen storage carrier, and a preparation method therefor and the use thereof. In the catalyst, carbon nitride is used as a carrier, and metal nanoparticles Ru and Ni serve as active components and are jointly loaded on the carbon nitride carrier; and the carbon nitride is prepared by mixing carbon tetrachloride, ethidene diamine and nano-silica, reacting same to obtain a carbon nitride polymer, then calcining same at 750-850ºC, performing a desilicification treatment, and then filtering and drying same. The catalyst provided in the present application has good catalytic hydrogenation performance in the selective hydrogenation of the quinoline organic hydrogen storage carrier and can achieve the omission of a solvent in a reaction system; the reaction is simple, green and environmentally friendly, and the gravimetric hydrogen storage density of the system can be maximally ensured when a quinoline compound is used as an organic hydrogen carrier; moreover, the catalyst also has a good cycling stability.

The invention relates to the technical field of waste plastic resource utilization, and particularly provides a method for preparing glycollic acid through high-selectivity photoelectrocatalytic oxidation of polyethylene glycol terephthalate (PET) plastic. The core of the method is that a carbon nitride film loaded and modified by heteroatom doping (sulfur / phosphorus and the like) and an oxidation co-catalyst (Ni (OH) 2, NiFeOOH and the like) is used as a photo-anode, and under the conditions of certain bias voltage, electrolyte pH and composition and light source wavelength, PET oxidation is guided to generate glycolic acid with high selectivity. According to the method, efficient conversion from the PET waste plastics to high-value chemicals is achieved, the Faraday efficiency of glycollic acid in the product can reach 75% or above, and an innovative technical path is provided for plastic pollution abatement and waste turning into wealth.