177 results about "Graphitic carbon nitride" patented technology

This patent application describes graphitic carbon nitride materials that are useful in electrochemical cells such as Lithium-Sulfur batteries. Also disclosed are lithium-sulfur batteries designed to incorporate these materials and methods of manufacturing the same. Batteries that include this material exhibit increased electrode kinetics of the lithium-sulfur electrochemical couple, phenomena that improve the specific capacity, usable lifetime and other desirable characteristics of these batteries.

The present invention relates to a synthetic method of graphitic carbon nitride material. The method involves a homogenous mixing of carbon nitride precursor and ammonium salt, and calcining the mixture to obtain a porous graphitic carbon nitride material. Wherein, the ammonium salt is any one or a combination of at least two which could release gaseous NH₃ during thermolysis. The present invention uses thermolabile ammonium salt as a pore former; the thermolysis of ammonium salt could release soft gas bubbles during the calcination; the later burst of bubbles leads to the formation of nanoporous structure. The proposed method is template-free and environmentally-friendly, and the resultant material exhibits high photocatalytic activity in the field of gas and water decontamination.

The invention discloses a preparation method of a graphite phase carbon nitride/rutile monocrystal titanium dioxide (TiO2) nanowire array. The preparation method is characterized by comprising the following steps: (a) dissolving a cyanamide compound or urea in a solution, immersing the prepared rutile monocrystal TiO2 nanowire array into the obtained cyanamide compound or urea solution, and then taking out and drying the nanowire array; and (b) performing heat treatment on the dried nanowire array to finally obtain the graphite phase carbon nitride/rutile monocrystal TiO2 nanowire array. The preparation method has the advantages of simple process and low cost, thus being applicable to large-scale industrial production; and the prepared graphite phase carbon nitride/rutile monocrystal TiO2 nanowire array has good visible light response activity, and can be widely applied to the fields such as photocatalysis, hydrogen production by photocatalytic decomposition of water, photoelectric conversion and the like.

The invention belongs to the technical field of environment and water treatment, and discloses a composite visible-light-responding photocatalyst material, and a preparation method and application thereof. The preparation method comprises the following steps: preparing graphite-like carbon nitride (g-C3N4) by adopting a thermal polycondensation synthesis process, and then carrying out secondary calcination on the g-C3N4 by adopting a thermal oxidation etching process so as to obtain graphitic carbon nitride (SL g-C3N4) of a monatomic nanometer lamellar structure; reducing graphene oxide (GO) by using ethylenediamine, and introducing an amino group to prepare aminated graphene oxide (NGO) with electropositivity; subjected SL g-C3N4 and NGO to ultrasonic mixing so as to prepare an SL g-C3N4/NGO heterojunction. Through photocatalytic degradation research on the cationic dye rhodamine B and the anionic dye methyl orange, the optimal preparation conditions of the composite visible-light catalyst heterojunction are obtained, and the visible-light catalytic activity and stability of the composite photocatalyst material are significantly improved.

The present invention provides a photocatalyst composite structure and a preparation method thereof. The photocatalyst composite structure has backbone-branch structural feature; the graphite type carbon nitride (g-C3N4) is the backbone, and carbon nanotubes(CNTs) grown in situ on the backbone chemical through vapor deposition (CVD) are the branches; and the nano photocatalyst coats on the entire backbone-branch complex structure surface. The invention has the advantages that the photocatalyst composite structure can degrade organic contaminants and realize photocatalytic water decomposition for hydrogen production under ultraviolet and visible light; in addition, the backbone-branch composite structure has large specific surface area, and can fully contact with organic pollutants and electrolyte solution to improve the photocatalytic efficiency.

The invention relates to the field of photocatalysis, and particularly relates to a visible-light-driven photocatalyst for degrading dye in wastewater, and preparation and application thereof. The visible-light-driven photocatalyst for degrading dye in wastewater is characterized in that mesoporous silicon dioxide of which the framework contains Ti atoms is used as a carrier, the mesoporous silicon dioxide carrier carries graphitic carbon nitride, and bivalent Cu ions are doped on the graphitic carbon nitride, wherein the graphitic carbon nitride with the doped cupric ions serves as a main catalyst, and the element Ti serves as a cocatalyst. The Ti atoms contained in the framework of the mesoporous silicon dioxide directly react with H2O2 in a photo-Fenton-like system to produce hydroxyl free radicals, thereby obviously improving the photo-Fenton-like reaction activity. The photocatalyst provided by the invention catalyzes degradation of methyl orange and/or rhodamine B in wastewater, and degradation can be performed at room temperature under the irradiation of visible light, thereby enabling the photocatalyst to have the advantages of mild reaction conditions, low cost and easy implementation; and the photocatalyst can be easily regenerated, and still has excellent photocatalytic performance after being regenerated many times.

A graphitic carbon nitride/silver carbonate/silver bromide ternary composite nano-material, a preparing method thereof and uses of the nano-material are disclosed. Rodlike Ag<2>CO3 and g-C3N4 having a lamellar structure grow together, and AgBr particles are attached to the surface of the Ag<2>CO3. The nano-material comprises 5-30 wt% of the g-C3N4 and 1-8 wt% of the AgBr, with the balance being the Ag<2>CO3. The preparing method includes (1) subjecting urea and melamine to high-temperature solid-phase sintering to obtain a g-C3N4 lamellar structure, (2) synthesizing the g-C3N4 nanosheet, a soluble silver salt and a carbonate or bicarbonate into g-C3N4/Ag<2>CO3 particles through a solution precipitation reaction, and (3) introducing Br<-> to the g-C3N4/Ag<2>CO3 particles. The prepared ternary composite nano-material is high in yield and can be adopted as a photocatalyst.

The invention discloses photocatalytic cement mortar containing graphite phase carbon nitride. The photocatalytic cement mortar comprises the following components in part by weight: 1 part of cement,0.01-0.05 part of graphite phase carbon nitride, 0.03-0.07 part of a polymer, 2-5 parts of construction sand and 0.025-0.035 part of an admixture with thickening, water holding and plasticity-stabilizing effects. The photocatalytic cement mortar is prepared by mixing and stirring the graphite phase carbon nitride, the cement, the construction sand, the polymer, the admixture and water. The photocatalytic cement mortar disclosed by the invention has the benefits that the graphite phase carbon nitride is utilized for absorbing blue and violet light in a solar spectrum to generate photocatalyticreaction, so that nitrogen oxides and volatile organic compounds (VOC) in an atmospheric environment are catalyzed and removed in real time, and the function of purifying the atmosphere is realized. Apreparation method of the photocatalytic cement mortar disclosed by the invention is simple in steps and has popularization and utilization values in engineering construction.

The present invention relates to a method for preparing carbon nitride material wherein organic rodanide is simply pyrolysed to give carbon nitride material in an efficient, economical and ecologically friendly manner. The present invention accomplishes preparation of graphitic carbon nitride materials having a carbon to nitrogen molar ratio of about 3:4. The employed starting materials are cheap and can be easily removed and/or washed away.

The invention provides a metal element doped CNB photocatalyst. According to the metal element doped CNB photocatalyst, metal elements and non-metal elements B are used for jointly doping graphite phase carbon nitride, and compared with pure graphite phase nitridation, prepared double-doped graphite phase carbon nitride has high visible-light catalytic activity to organic dyestuff. The invention further provides a preparation method of the catalyst. CNB is prepared through the method, the prepared CNB is compounded with the metal elements, the method is easy to operate, and the yield of the catalyst is high.

The invention provides a carbon doped graphite phase carbon nitride film and a preparation method thereof. The preparation method includes: dispersing a carbon source and a carbon nitride precursor inwater, carrying out polymerization reaction at 30DEG C-100DEG C in the presence of an acid catalyst, and conducting filtering and drying to obtain a modified precursor; and placing the modified precursor into a crucible, covering the crucible with a substrate, performing heating to 500DEG C-650DEG C and performing heat preservation for 0.5h-5h, thus obtaining the carbon doped graphite phase carbon nitride film. The invention also provides the carbon doped graphite phase carbon nitride film prepared by the above-mentioned preparation method. The carbon doped graphite phase carbon nitride filmprovided by the invention has the advantages of simple preparation process, low cost and excellent photocatalytic activity.

The invention provides a spiral carbon nanotube prepared through a molten salt method and a method thereof. Specifically, soluble molten salt is applied to a calcining process of manganese salt and melamine. As temperature rises, the melamine is carbonized into graphitic carbon nitride; carbon atoms and nitrogen atoms which are thermal decomposed by carbon nitride are gathered into manganese saltnano-particles under higher temperature and then precipitate to form a new graphitic layer sheet; and the graphitic layer sheet is curled so as to form the carbon nanotube. Compared with a straight carbon nanotube, the spiral carbon nanotube prepared by the invention is capable of displaying metallic and semiconductor behavior and displaying semimetallic behavior due to chirality of the spiral carbon nanotube and can serve as a superconductor. The spiral carbon nanotube has stable performances and can be applied to the fields of electromagnetic wave absorbing materials, bio-separation, water treatment, water detection, food safety detection, fully decomposed water, sensor fuel cells and the like.

The invention discloses a palladium-graphitic carbon nitride-carbon nanotube composite electrode, and a preparation method and application thereof. According to the preparation method, a graphitic carbon nitride-carbon nanotube composite is prepared by using a solid grinding thermopolymerization process in virtue of Pi-Pi accumulation and electrostatic action between melamine and carbon nanotubes;then palladium nanoparticles are used as a precursor for further functionalized modification of the graphitic carbon nitride-carbon nanotube composite through self-assembing so as to obtain a composite material with good catalysis performance and stability; so electrocatalytic activity is improved, problems in the dispersibility of graphitic carbon nitride are overcome, and the application scopeof the composite material is broadened. The preparation method is simple in process, convenient to operate, low in the amount of consumed chemical raw materials and reagents, mild in reaction conditions, small in the number of used equipment, low in production cost, capable of realizing large-scale production, low in environmental pollution and beneficial for environmental protection; and the prepared composite electrode has higher sensitivity and better catalytic performance and stability, and is especially suitable for direct and rapid detection of estradiol in water samples, food samples, feed samples, biochemical product samples and other samples.

The invention discloses a preparation method of a Cu3B2O6/g-C3N4 (cupric borate/graphitic carbon nitride) heterojunction photocatalyst and a method for degrading methylene blue dye wastewater. The preparation method comprises the following steps of using citric acid, copper nitrate and boric acid as raw materials of Cu3B2O6, using melamine as raw material of g-C3N4, and adopting a grinding-calcining preparation method to prepare the heterojunction photocatalyst; under the radiation condition by visible light, degrading the methylene blue dye wastewater by the heterojunction photocatalyst. The preparation method has the advantages that the visible light can be efficiently utilized, the requirement on equipment is low, the energy consumption is little, the operation cost is low, the removal rate of methylene blue is 100% within a short time, and the Cu3B2O6/g-C3N4 heterojunction photocatalyst can be regenerated.

The invention discloses a rapid preparation method of a carbon-doped porous graphitic carbon nitride nano-dispersion system and relates to the fields of nanoscience, material science, photocatalysis and the like. According to the method, high-temperature polymerization of melamine or dicyanodiamine is subjected to in-situ doping and structure control with gas produced through decomposition of hexamethylenetetramine at the high temperature, and a carbon-doped porous graphitic carbon nitride nanomaterial is obtained with a one-step method. Rapid batch preparation of the carbon-doped porous graphitic carbon nitride nano-dispersion system is realized under the high-shearing action, and the rapid preparation method has broad application prospect in the fields of photocatalysis, electrochemical sensing and the like.

The invention belongs to the field of pesticide detection, and discloses a simple electrochemiluminescence detection method of glyphosate pesticide, and especially relates to preparation and applications of a carbon nitride-based glyphosate electrochemiluminescence sensor. According to a preparation method, graphene carbon nitride (g-C3N4) is used for modifying glassy carbon electrode loaded with Ag<+> on the surface; Ag<+> is released from the g-C3N4 modified electrode surface under the complexing action of glyphosate in a solution with Ag<+> on the surface of the electrode, recovery of electroluminescent signals is realized, and detection of glyphosate is realized via detecting the electroluminescent signals.

The invention relates to the technical field of humidity detection sensors, in particular to a humidity sensor of a CeO2/g-C3N4 hybrid membrane as well as a preparation method and application thereof.The humidity sensor comprises a substrate, a humidity-sensitive material combined on the substrate and a resistance value detection device communicated with the humidity-sensitive material, wherein the humidity-sensitive material is a cerium oxide-graphite carbonitride hybrid membrane prepared from cerium oxide and graphite carbonitride. The humidity sensor of the CeO2/g-C3N4 hybrid membrane hasa wider humidity monitoring range, and when the relative humidity (RH) is increased from 0% to 97%, the response value of the sensor is close to 7000. Compared with a traditional humidity sensor, thesensor has obvious advantages in the aspects of sensitivity, stability, responsiveness, repeatability, recovery time and the like.

A composition comprising a graphitic carbon nitride material and a conductive carbon material coating may be used in electrodes or in batteries such as sodium ion batteries. The composition may be prepared using a method comprising the steps of providing a nitrogenous compound; adding a carbonaceous material to the nitrogenous compound to form a slurry; drying the slurry to form a coated mixture; and carbonizing the coated mixture.

The invention discloses a method for preparing a two-dimensional graphitic carbon nitride dispersion liquid by using ultrasound coupling supergravity rotating bed through stripping, and belongs to thetechnical field of preparation of carbon nitride dispersion liquids. The method comprises the following steps: (1) carrying out a solid-phase thermal polycondensation reaction by taking a nitrogen-rich organic compound as a raw material to obtain blocky graphitic carbon nitride; (2) carrying out protonation modification on the blocky graphitic carbon nitride by adopting a protonic acid, carryingout washing, carrying out drying and carrying out grinding to obtain protonated carbon nitride; and (3) dispersing the protonated carbon nitride powder into a chemical liquid to obtain a material dispersion liquid, introducing the material dispersion liquid into an ultrasoud coupling supergravity rotating bed system, stripping the material under the synergistic effect of ultrasonic waves and supergravity shearing force, and carrying out centrifugal separation to obtain the carbon nitride dispersion liquid. The method is simple and easy to implement, low in cost, high in stripping efficiency and high in yield, can realize continuous large-scale production, and has a wide application prospect.