13 results about "Iodine doped" patented technology

The invention relates to a composite aerogel for water treatment and a preparation method thereof, and the preparation method comprises the following steps: activating graphene oxide, and then carrying out amidation reaction on the activated graphene oxide, aminated beta-cyclodextrin and hexamethylenediamine to obtain modified graphene; then carrying out hydrothermal reaction on the GO / BiOCOOH composite material, a Bi < 3 + > solution and formamide to obtain a modified GO / BiOCOOH composite material; crosslinking in a lignin aqueous solution to obtain hydrogel; and finally, performing supercritical drying to obtain the composite aerogel. The preparation method has the beneficial effects that by constructing macroscopic blocky aerogel, the problems that a powder material is easy to lose and difficult to recycle are effectively solved; the high photocatalytic activity is still kept under the condition that iodine doping is not used, and the possibility of secondary pollution of free iodine to a water body due to instability of the material is reduced; under the synergistic effect of the aerogel and the photocatalytic reaction, the efficient proceeding of the adsorption and desorption-photocatalytic reaction is realized; the material is high in stability, easy to recover, capable of being recycled through simple desorption, high in cycle index and long in service life.

The invention relates to a fuel cell catalyst and a preparation method thereof, and belongs to the technical field of fuel cells. The preparation method of the fuel cell catalyst provided by the invention comprises the following steps: (1) performing heat treatment on conductive carbon black to obtain graphitized conductive carbon black; (2) mixing ammonium iodide with the graphitized conductive carbon black obtained in the step (1) to obtain mixed powder, and calcining the obtained mixed powder to obtain an iodine-doped carrier; and (3) dipping the iodine-doped carrier obtained in the step (2) in a platinum salt solution, drying, and carrying out heat treatment in a reducing atmosphere to obtain the fuel cell catalyst. According to the preparation method, ammonium iodide easy to sublimate and conductive carbon black subjected to graphitization heat treatment are uniformly mixed, the ammonium iodide sublimates to the surface of the graphitized conductive carbon black in the heat treatment process to realize in-situ doping, an iodine-doped voltage-resistant carrier is formed, and then Pt is loaded on the iodine-doped voltage-resistant carrier, so that the Pt-loaded iodine-doped voltage-resistant composite material is obtained. The fuel cell catalyst with high stability and excellent electrochemical performance is obtained.

This invention provides iodine-doped bismuth oxychloride nanosheets, their preparation method, and applications. The preparation method of iodine-doped bismuth oxychloride nanosheets includes: reacting C7H... 13 IN2 is dissolved in anhydrous acetic acid, and then Bi(NO3)3·5H2O is added and stirred to obtain suspension A. KCl is dissolved in water to obtain solution B. Solution B is added dropwise to suspension A, and then polyethylene glycol is added to obtain suspension C. Suspension C is transferred, reacted, filtered, and washed, and then dispersed in anhydrous ethanol and dried to obtain iodine-doped bismuth oxychloride bulk. The iodine-doped bismuth oxychloride bulk is mechanically exfoliated and transferred onto a SiO2 / Si substrate to obtain the final product. The application of iodine-doped bismuth oxychloride nanosheets involves photolithography, development, and sputtering to prepare Pt / I-BiOCl / Pt memristor devices. The iodine-doped bismuth oxychloride nanosheets prepared in this invention exhibit good analog resistive switching performance and can be used to prepare synaptic memristors.

The application is a preparation method and application of an iodine-doped cobalt-based electrocatalyst. The method uses mild ammonium iodide to perform a doping and synchronous etching strategy, successfully anchoring cobalt in the form of single atoms and clusters on an iodine-doped carbon substrate in one step; the obtained iodine-doped cobalt-based electrocatalyst has tandem catalytic active sites composed of iodine-coordinated cobalt single atoms and cobalt clusters, which can simultaneously promote the deoxygenation and hydrogenation steps in the electrocatalytic reduction of nitrate. The electrocatalytic synthesis of ammonia obtained by the application exhibits an ammonia yield of more than 17000 μg h ‑1 mg cat. ‑1 and a Faraday efficiency of more than 95%, achieving the simultaneous coexistence of high ammonia yield and high Faraday efficiency, and providing a new idea for green, efficient and sustainable ammonia synthesis.

The invention discloses an iodine-doped titanium dioxide composite graphite phase carbon nitride visible light response photocatalyst and a preparation method thereof, and belongs to the technical field of photocatalytic materials. According to the method, a porous layered structure of graphite phase carbon nitride (g-C3N4) is used for providing abundant active sites for a catalytic reaction, meanwhile, the visible light absorption range is widened synergistically, titanium potassium oxalate is used as a titanium source, sodium periodate is used as an oxidizing agent and an iodine source, and sulfuric acid is used for providing an acidic environment. Compared with g-C3N4 and an iodine-doped titanium dioxide (I-TiO2) photocatalyst prepared in the same way, the prepared I-TiO2 / g-C3N4 has efficient degradation performance, a target pollutant methyl orange (MO) solution is degraded under simulated visible light irradiation, the degradation rate reaches 95.7% in 60 min, and a good visible light degradation effect is achieved. According to the experiment, the powder is prepared by using a one-step hydrothermal method, and the method is simple in process and efficient.

The invention relates to the technical field of colloidal quantum dot doping, in particular to an iodine-doped preparation method of PbS colloidal quantum dots, which comprises the following steps: preparing PbS CQDs by a thermal injection method, dispersing the PbS CQDs in an n-octane solution for later use after liquid phase exchange, weighing a certain amount of iodine (I) solid, adding a proper amount of ethanol solvent, treating under ultrasonic conditions until the iodine (I) solid is completely dissolved, and drying to obtain the PbS colloidal quantum dots. The iodine-doped PbS (I) CQDs thin film is prepared by the following steps: adding a PbS CQDs solution into a quartz substrate to obtain a uniform iodine solution, dripping the PbS CQDs solution on the quartz substrate, spin-coating to form a PbS CQDs thin film, immersing the obtained thin film into the iodine solution for 30 seconds, taking out the thin film, spin-drying the thin film on a spin coater, cleaning the surface with an ethanol solution, and repeating the operation twice to finally obtain the iodine-doped PbS (I) CQDs thin film. The doping technology is simple and effective, the doping concentration is adjustable, large-scale solution phase doping can be achieved, and the doping technology is expected to be applied to PbS quantum dot material and film doping and plays an important role in PbS quantum dot photoelectric devices and electronic devices.

This invention discloses an iodine-doped bismuth oxide catalyst, its preparation method, and its applications. In the iodine-doped bismuth oxide catalyst, the iodine doping amount, as analyzed by EDS, is 50-1000 ppm, preferably 100-600 ppm. The iodine-doped bismuth oxide catalyst provided by this invention exhibits excellent catalytic activity in the electrochemical reduction of carbon dioxide to formic acid / formate, with significantly improved current density and current efficiency.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a nonmetal iodine-doped hollow carbon sphere catalytic material as well as a preparation method and application thereof. The preparation method of the nonmetal iodine-doped hollow carbon sphere catalytic material comprises the following steps: mixing and grinding hollow carbon sphere powder and ammonium iodide to obtain doped powder; and coating the doped powder with template particles, and sintering to obtain the non-metal iodine-doped hollow carbon spheres. According to the invention, iodine is doped in a carbon skeleton, and a template method is used for assisting in constructing a multistage aperture, so that active sites are increased, the efficient degradation rate of organic pollutants is improved, the retention time of organic molecules is prolonged, the degradation efficiency of organic matters is greatly improved through the cooperation of iodine and the carbon skeleton, and secondary pollution is not caused at the same time.

The invention discloses a preparation method and application of an iodine-doped carbon nitride photocatalytic material, and belongs to the technical field of photocatalytic material preparation and water pollution control. The preparation method of the iodine-doped carbon nitride photocatalytic material comprises the following steps: S1, mixing melamine and ammonium iodide to obtain a mixed material; s2, calcining the mixture in an inert atmosphere, and after calcining is finished, cooling, washing and drying to obtain the iodine-doped carbon nitride photocatalytic material. According to the method, the exciton effect is regulated and controlled through iodine doping, molecular oxygen is efficiently activated to generate singlet oxygen, and rapid and selective degradation of electron-rich organic pollutants is achieved.

The rapid preparation method comprises the following steps: mechanically ball-milling and uniformly mixing elemental iodine and reduced graphene oxide, tabletting, packaging into a quartz bottle in an argon glove box, carrying out microwave synthesis for a few times in a microwave synthesizer, and removing the elemental iodine physically deposited on the surface of the reduced graphene oxide to obtain the iodine-doped graphene material for the positive electrode catalyst of the lithium-sulfur battery. The iodine-doped graphene material is obtained; according to the invention, iodine atoms with high content and low price are selected as a catalyst, and the iodine-doped reduced graphene oxide material can be rapidly and efficiently prepared within 100 seconds by utilizing the wave-absorbing characteristic of the reduced graphene oxide material and the characteristic that iodine elementary substance is easy to sublimate and utilizing a microwave gas-phase synthesis method without high-temperature reaction or long-time hydrothermal synthesis; the material is applied to the sulfur positive electrode side of the lithium-sulfur battery; the positive electrode material of the battery is prepared by adding a catalyst, so that the reaction energy barrier of sulfur reduction is reduced, the electrochemical reaction polarization is reduced, the redox reaction kinetics is accelerated, the shuttle effect of polysulfide is inhibited, and the cycling stability of the battery is improved.

The invention provides a preparation method of an iodine element and carbon nanotube co-doped n-type PbTe thermoelectric material, and belongs to the technical field of thermoelectric material preparation. The method comprises the following steps: S1, preparing an iodine-doped n-type PbTe thermoelectric material, namely PbTe (1-x) Ix powder; and S2, preparing mixed powder of the carbon nano tube and PbTe < 1-x > Ix, namely PbTe < 1-x > Ix-y wt% CNTs powder. And S3, preparing an iodine element and carbon nanotube co-doped n-type PbTe thermoelectric material, namely, a PbTe < 1-x > Ix-y wt% CNTs block body. By accurately controlling the iodine doping amount (x = 0.002-0.008) and the composite proportion (y = 0.1-0.5) of the carbon nanotubes, the thermal conductivity is reduced while the carrier concentration is optimized, the ZT value of the material reaches 1.22 at 775K and is increased by more than 500% compared with pure PbTe, the preparation process is simple and controllable, and the preparation method is suitable for large-scale production of medium-high temperature thermoelectric conversion devices.

The invention provides preparation and application of a visible-light response type photochromic iodine-doped bismuth oxybromide catalyst, and belongs to the field of preparation and application of photocatalysts. The iodine-doped bismuth oxybromide BiOBr0. 92I0. 08 is synthesized by a hydrothermal method, and has the characteristics of high purity, simple structure, good stability, good dispersity and the like. The obtained product can be deeply colored within 15 seconds under illumination of 450 nm, and fades in air; and rapid coloring and color fading can be realized under ultraviolet irradiation. The conversion number (TON) of the BiOBr < 0.98 > I < 0.02 > nanosheet for photocatalytic oxidation of ethylbenzene reaches up to 274000 mol.g, which is 7 times that of the BiOBr nanosheet. The method has the advantages of low synthesis cost, no pollution, suitability for large-scale industrial production and the like, and can be applied to photocatalytic oxidation of ethylbenzene.