18 results about "METHYLIODIDA" patented technology

The invention discloses a preparation method and application of a metal sulfide adsorbent for adsorbing iodine and methyl iodide. The preparation method comprises the following steps: uniformly mixing an antimony source, a sulfur source, a deep eutectic solvent, polyamine and water to obtain a mixed solution; and transferring the mixed solution into a high-pressure reaction kettle, sealing, carrying out hydrothermal reaction at 110-220 DEG C for 2-9 days, cooling to room temperature to separate out crystals, and filtering, washing and drying to obtain the metal sulfide adsorbent. The invention also discloses application of the metal sulfide adsorbent in adsorption of iodine and methyl iodide. The metal sulfide adsorbent disclosed by the invention has a good adsorption effect on iodine and methyl iodide, and compared with an ethylenediamine-oriented metal sulfide adsorbent, the diethylenetriamine-oriented metal sulfide adsorbent has higher adsorption capacity on iodine and methyl iodide.

The invention provides a preparation method of (S)-oxetane-2-methylamine. The preparation method of (S)-oxetane-2-methylamine comprises the following steps: (1) carrying out ring closing reaction on a compound A under an alkaline condition to obtain a compound B; (2) reacting the compound B with dibenzylamine to obtain a compound C; (3) reacting the compound C with a reducing agent to obtain a compound D; (4) reacting the compound D with paratoluensulfonyl chloride to obtain a compound E; (5) reacting the compound E with alkali to obtain a compound F; and (6) carrying out a reaction on the compound F and palladium on carbon to obtain the (S)-oxetane-2-methylamine. According to the preparation method provided by the invention, ring expansion reaction using trimethylsulfoxide iodide in the prior art is avoided, the problem that residual sulfur elements cause poisoning of a palladium-carbon catalyst is solved, meanwhile, sodium azide is also avoided, and the preparation method is safe and reliable in process, high in chiral purity and yield and suitable for industrial large-scale production.

The application discloses a sulfonylurea herbicide hydrolytic enzyme TsmE mutant, a coding gene thereof and a use thereof. The amino acid sequence of the mutant is shown in SEQ ID NO. 4. The mutant M6 provided by the application has deesterification activity to macromolecular sulfonylurea herbicides methyldisulfuron and sodium salt of methyl iodosulfuron, and therefore has a good application prospect in sulfonylurea herbicide residual pollution bioremediation and anti-herbicide transgenic engineering.

The invention relates to a chemical absorption liquid for removing methyl iodide and a preparation method thereof, and belongs to the technical field of underwriting. The chemical absorption liquid comprises the following raw materials in percentage by mass: 0.2-5% of sodium thiosulfate, 1-10% of long-chain alkyl trimethyl ammonium halide, 0-1% of sodium hydroxide, 0-10% of polyethylene polyamine and the balance of water. The number of long-chain carbon atoms in the long-chain alkyl trimethyl ammonium halide is greater than 8; the chemical absorption liquid is prepared by completely dissolving and uniformly mixing the components. According to the chemical absorption liquid, the long-chain alkyl trimethyl ammonium halide salt is introduced as a surfactant for the first time, has a solubilizing effect, and can greatly reduce the gas-liquid mass transfer resistance of methyl iodide, so that efficient absorption of radioactive and non-radioactive methyl iodide is realized; the chemical absorption liquid is not only suitable for normal temperature, but also suitable for high-temperature and high-humidity environments, and harmful gas can be purified in a solution washing or solution spraying mode.

The invention belongs to the technical field of organic chemical synthesis, and particularly relates to a synthetic method of deuterated toluene-D3, which comprises the following steps: reacting deuterated iodomethane with magnesium to obtain a Grignard reagent deuterated methyl magnesium iodide; and then carrying out coupling reaction on the deuterated methyl magnesium iodide and bromobenzene under the catalysis of a nickel metal catalyst to obtain the deuterated toluene-D3. The synthesis method solves the problems of many byproducts, high cost and low utilization rate of deuterated raw materials when the existing toluene synthesis process is used for preparing semideuterated toluene, realizes efficient synthesis of high-purity deuterated toluene-D3, greatly reduces the generation of polymethyl compounds, and is short in production period and simple in post-treatment.

The invention discloses a radioactive methyl iodide filtering material and a preparation method thereof, and belongs to the technical field of nuclear fuel waste gas treatment. The preparation method comprises the following steps: preparing a nitrogen-carbon skeleton from a reaction monomer through a cross-linking reaction; dispersing the nitrogen-carbon skeleton, a silver nitrate solution and an ionic liquid in water to obtain a mixed solution; the mixed solution is subjected to nano silver oxide in-situ growth in the environment of ultraviolet lamp irradiation and ultrasonic oscillation, and the radioactive methyl iodide filtering material is prepared. The radioactive methyl iodide filtering material is a nano silver oxide in-situ loaded nitrogen-carbon skeleton composite material and can be used as a radioactive methyl iodide filtering and storing material, efficient adsorption of radioactive methyl iodide is achieved through the chemical adsorption effect of nano silver oxide and methyl iodide, meanwhile, it is ensured that the adsorption process is stable and irreversible, and the radioactive methyl iodide filtering material can be used for filtering and storing radioactive methyl iodide. And no methyl iodide is released in a deep stratum treatment environment.

The application discloses a method for preparing a heterojunction perovskite photodetector, comprising the following steps: preparing an electron transport layer; dissolving lead iodide and lead chloride in a mixed solution of dimethylformamide, N-methylformamide and N-methylpyrrolidone to obtain a precursor solution; in an air atmosphere, spin-coating the precursor solution onto the electron transport layer, immediately immersing into an anti-solvent after uniform spreading, and obtaining a PbI2-PbCl2 film after crystallization; spin-coating a methylammonium iodide solution onto the PbI2-PbCl2 film, and obtaining a perovskite film after vacuum annealing; spin-coating a long-chain ligand solution onto the three-dimensional perovskite film, vacuum annealing, and obtaining a perovskite heterojunction film; sequentially preparing a hole transport layer, a hole blocking layer and an anode on the perovskite heterojunction film to obtain the heterojunction perovskite photodetector. The method has the advantages that the prepared photodetector has high external quantum efficiency and high detection rate, and the preparation is simple.

The invention discloses a methylamine formamidino perovskite single crystal, a preparation method thereof and an X-ray detector, and belongs to the technical field of perovskite single crystal X-ray detectors. Methyl iodide amine, formamidino hydriodate and lead iodide are used as raw materials, anhydrous acetic acid is used as an additive, growth is carried out in a solvent through a seed crystal method, and the methylamine formamidino perovskite single crystal is obtained. Anhydrous acetic acid and formamidine generate hydrogen-bond interaction, formamidine is pulled to enter crystal lattices, so that phase separation is eliminated, acetate and Pb coordinate to delay formation of a lead-iodine framework, the speed of methylamine and formamidine entering the crystal lattices is balanced, meanwhile, the stability of a methylamine formamidine perovskite precursor solution is improved, stable growth of methylamine formamidine perovskite single crystals is achieved, and the methylamine formamidine perovskite single crystals are obtained. The single crystal has the advantages of high crystallinity, low defect density, large size and favorable X-ray response performance. The methylamine formamidine perovskite single crystal is high in controllability in the growth process, and the preparation method is high in operability, simple and easy to implement, short in preparation period, low in equipment requirement and low in cost.

The application provides application of methylammonium iodide in preparation of a black-phase CsPbI3 thin film. The application also provides a preparation method of the CsPbI3 thin film. By introducing methylammonium iodide into a perovskite precursor and combining a vacuum-assisted method, the application overcomes the disadvantage of rapid disorder of CsPbI3 crystallization, and realizes high-quality preparation of the black-phase CsPbI3 thin film at a low temperature.

The invention relates to the technical field of film preparation, in particular to a preparation method for preparing an ultra-thick formamidine and methylamine mixed perovskite film through a blade coating method and application of the super-thick formamidine and methylamine mixed perovskite film through the blade coating method. The preparation method comprises the following steps that a precursor solution is prepared, specifically, methyl ammonium iodide, formamidine ammonium iodide and lead iodide are put into a ternary mixed solvent, and preparation of the precursor solution is completed; and performing deposition treatment, namely depositing the precursor solution prepared in the step 1 on a glass substrate by adopting a blade coating method to form a thin film, and completing the deposition treatment of the glass substrate. In the ternary mixed solvent, ethylene glycol monomethyl ether ensures rapid drying, N, N-dimethylformamide stabilizes the morphology of the wet film, dimethyl sulfoxide regulates and controls the crystallization process, and after the perovskite wet film prepared under the system is subjected to vacuum flash evaporation and thermal annealing, the perovskite wet film can be rapidly dried. And finally, the high-quality perovskite thin film with large crystal grains, uniform distribution, black and bright mirror surfaces on the upper surface and the lower surface and no void defect is formed, and the requirement of a high-performance solar cell on an active layer structure is met.

The application discloses a MAPbI3 perovskite film based on defect competition regulation and a preparation method thereof. The preparation method of the MAPbI3 perovskite film based on defect competition regulation comprises the following steps: S1, methylammonium iodide and lead iodide are added into a solvent to obtain a precursor solution; S2, a substrate is pretreated; S3, the precursor solution is deposited on the substrate by adopting an anti-solvent spin coating method to obtain a precursor film; and S4, the precursor film is subjected to annealing treatment to obtain the MAPbI3 perovskite film based on defect competition regulation. The molar ratio of the methylammonium iodide and the lead iodide is (0.8-1.2):1. By adjusting the stoichiometric ratio of the precursor, the application realizes the synergistic regulation between the grain growth behavior and the defect kinetics, thereby reducing the non-radiation recombination, improving the carrier kinetic behavior and improving the stability of the perovskite film.

The application discloses a preparation method of a bismuth-based gamma-Al2O3-silica material, which comprises the following steps: adding nitric acid into water to obtain a nitric acid aqueous solution; adding pseudo-boehmite into the nitric acid aqueous solution and stirring to obtain sol I; adding silica into the sol I and stirring to obtain sol II; calcining the sol II under air condition to obtain gamma-Al2O3-silica; and mixing the gamma-Al2O3-silica with bismuth powder through mechanical mixing to obtain the bismuth-based gamma-Al2O3-silica material. The bismuth-based gamma-Al2O3-silica material has the advantages of low cost, simple synthesis and easy industrialization. The bismuth-based gamma-Al2O3-silica material prepared by the application has high adsorption capacity for iodine and methyl iodine simultaneously through simple mechanical mixing, and has a good industrial application prospect.

The application discloses a preparation method of a bismuth silicate adsorption material and application of the bismuth silicate adsorption material in methyl iodide adsorption, and comprises the following steps: dissolving Bi(NO3)3.5H2O in ethylene glycol, stirring until completely dissolved to obtain solution A; dissolving Na2SiO3.9H2O in deionized water, stirring until completely dissolved to obtain solution B; adding the solution B into the solution A drop by drop, continuously stirring, adjusting pH to obtain a reaction solution; transferring the reaction solution into a hydrothermal reaction kettle, heating and keeping warm, naturally cooling to room temperature, and then filtering, washing and drying to obtain the bismuth silicate adsorption material, namely Bi2O2SiO3. The prepared bismuth silicate adsorption material Bi2O2SiO3 has excellent methyl iodide adsorption performance, the adsorption amount of the bismuth silicate adsorption material to methyl iodide reaches 1426 mg / g, and the bismuth silicate adsorption material can form stable BiI3 after adsorbing CH3I, so that secondary pollution is effectively avoided; in addition, the preparation method is simple, the production cost is low, and the bismuth silicate adsorption material is easy to mass-produce.

The invention discloses a preparation method of a methyl amine iodide film and a preparation method of an MAPbI3 perovskite film, and belongs to the technical field of batteries. The preparation method of the methyl amine iodide film comprises the following steps: sequentially carrying out atomic layer deposition on methylamine and hydriodic acid, and repeating to obtain the methyl amine iodide film. According to the preparation method, the methyl amine iodide film is synthesized through an atomic layer deposition (ALD) method for the first time. Moreover, the ALD preparation method of the methyl amine iodide thin film is applied to preparation of the MAPbI3 perovskite thin film, so that the MAPbI3 perovskite thin film has relatively high crystallinity, relatively low density defect and excellent uniformity, precise control of the components and the structure of the perovskite thin film is realized, and the overall performance of the cell is further improved. The MAPbI3 perovskite thin film has the advantages of high photoelectric property, high conversion efficiency and long-term stability, is suitable for large-scale industrial production, and promotes the application of a battery containing the MAPbI3 perovskite thin film.

This invention discloses a perovskite solar cell and its fabrication method, comprising: ultrasonically cleaning a substrate sequentially with a mixture of domestic water and glass cleaning agent, domestic water, and anhydrous ethanol, followed by drying with a nitrogen blower, and then treating it with an ultraviolet-ozone device; spin-coating an electron transport layer onto the treated substrate surface; dissolving lead iodide, formamidinium hydroiodate, methylamine iodide, methylamine chloride, cesium iodide, rubidium iodide, L-α-phosphatidylcholine, and phenylethylamine chloride in a mixture of N,N-dimethylformamide, dimethyl sulfoxide, and ethylene glycol monomethyl ether to obtain a perovskite precursor solution; scraping the perovskite precursor solution onto the surface of the electron transport layer to form a perovskite layer; spin-coating a hole transport layer onto the surface of the perovskite layer; and evaporating an electrode layer onto the surfaces of the hole transport layer and the substrate. This invention improves the coating speed and process efficiency while ensuring good device performance and stability.

The application discloses a method for generating a broadband spectrum by using femtosecond laser etching MAPbI3, wherein methylammonium iodide and lead iodide are used to prepare MAPbI3 micrometer strips, a femtosecond laser with a specific wavelength is used to etch the MAPbI3 micrometer strips, and a femtosecond laser with another wavelength is used to excite the etched sample, so that a broadband spectrum is successfully generated; a variety of spectral characterization technologies are combined to confirm that the broadband spectrum is derived from self-trapped exciton (STE) luminescence, and structural characterization and theoretical analysis reveal that the femtosecond laser etching causes the loss of specific ions in the material, triggers lattice distortion, and further induces the formation of STE.

The invention relates to the technical field of photoelectric conversion materials, in particular to a perovskite precursor material for photoelectric conversion and a preparation method thereof. The precursor material is prepared from the following raw materials: lead iodide, stannous iodide, methyl amine iodide and a modified hyperbranched polymer; the modified hyperbranched polymer is prepared from the following raw materials in parts by weight: 2 to 3 parts of triethyl borate, 2 to 3 parts of 1, 3-propylene glycol, 0.5 to 0.8 part of 2-amino-6-chlorobenzimidazole, 0.3 to 0.5 part of acryloyl chloride, 0.3 to 0.4 part of acrylic acid, 1 to 1.5 parts of trifluoroethyl methacrylate and 0.4 to 0.6 part of dopamine. The prepared perovskite precursor can improve the photoelectric conversion efficiency and improve the stability.

The application relates to the technical field of photoelectric conversion materials, in particular to a perovskite precursor material for photoelectric conversion and a preparation method thereof. The preparation raw material of the precursor material comprises the following components: lead iodide, stannous iodide, methyl amine iodide and modified hyperbranched polymer; the preparation raw material of the modified hyperbranched polymer comprises the following components in parts by weight: triethyl borate 2-3 parts, 1,3-propanediol 2-3 parts, 2-amino-6-chlorobenzimidazole 0.5-0.8 parts, acryloyl chloride 0.3-0.5 parts, acrylic acid 0.3-0.4 parts, trifluoroethyl methacrylate 1-1.5 parts and dopamine 0.4-0.6 parts; the prepared perovskite precursor can improve photoelectric conversion efficiency and stability.