1066results about "Titanium dioxide" patented technology

The invention relates to the technical field of composite film preparation, in particular to a multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film and a preparation method thereof.The multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film comprises a base material layer, a gas barrier layer, a bonding transition layer and a nano ceramic functional coating; the base material layer comprises the following components in parts by mass: 80-100 parts of biaxially oriented polypropylene; 20 to 30 parts of metallocene linear low density polyethylene; 5 to 8 parts of nano titanium dioxide; 0.5 to 1 part of beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid; and 0.3 to 0.6 part of calcium stearate. Through the multi-layer co-extrusion and gradient curing technology and the five-layer co-extrusion technology, it is ensured that the thickness of a base film is uniform and interlayer bonding is firm, the adhesive force of the coating is enhanced through plasma surface treatment, and activity retention and uniform distribution of functional components are guaranteed through the segmented curing strategy of the nano ceramic coating; compared with a traditional hot-pressing compounding or solvent coating process of the composite film, the energy consumption and the solvent residue risk are greatly reduced, meanwhile, the production efficiency and the product consistency are improved, and large-scale application is provided for medicine packaging.

The invention discloses a preparation method based on hollow double-shell nanofiller and application of the hollow double-shell nanofiller in preparation of a transparent heat-insulating coating, and belongs to the field of heat-insulating coatings. The preparation method comprises the steps that firstly, PMMA-coated TiO2 core-shell sphere powder is prepared; ultrasonically dispersing the prepared PMMA-coated TiO2 core-shell sphere powder into an aqueous solution of isopropanol, and adding acetic acid to adjust the pH value, so as to prepare a core-shell sphere PMMA-coated TiO2-coated SiO2; calcining the core-shell sphere PMMA (at) TiO2 (at) SiO2 to prepare a TiO2 (at) SiO2 sphere with a double-shell hollow structure; the preparation method comprises the following steps: mixing waterborne polyurethane, a solvent, a thickening agent, a curing agent, an auxiliary agent and DHTS, standing, and discharging bubbles to prepare the hollow double-shell nanofiller. The hollow double-shell nanofiller disclosed by the invention can realize the effects of high transmittance, heat insulation and fog prevention.

The invention provides a method for recovering Si, C and TiO2 based on chlorinated waste salt water quenching slag, which comprises the following steps: sequentially carrying out water quenching dissolution, precipitation separation and filter pressing dehydration treatment on chlorinated waste salt to obtain water quenching slag and supernate; adding a dilute acid solution into the water-quenched slag, dissolving, and adding a reducing agent for reaction to obtain slurry; carrying out solid-liquid separation on the slurry to obtain a solid material and filtrate; the filtrate is pumped into a boiling bed separator, the petroleum coke and TiO2 are intercepted by a medium material layer, clear liquid is discharged, then the medium material layer is subjected to backwashing regeneration, and the desorbed petroleum coke and TiO2 are subjected to graded enrichment by a hydrocyclone, so that petroleum coke slurry and TiO2 slurry are obtained. According to the method, TiO2, C and other resources in the water-quenched slag obtained after molten salt chlorination waste salt water quenching are recycled, and the technical problem that in the existing chlorination waste salt resourceful treatment process, Si, C, TiO2 and other resources in the water-quenched slag are wasted is solved.

The invention relates to the field of glaze, in particular to a method for preparing antibacterial glaze from zirconium silicate, high-temperature-resistant rare earth ions are introduced into the glaze to enhance the antibacterial property of the glaze, so that the glaze still keeps a relatively high antibacterial effect after being sintered at a high temperature; the components of the glaze are matched, a composite dispersing agent is introduced during preparation of the glaze for wet ultrafine grinding, and the glaze surface formed by the prepared antibacterial glaze has the effects of self-cleaning, formaldehyde removal and the like by controlling the material ratio; nano-scale erbium-doped zirconium silicate which is narrow in particle size distribution and free of agglomeration is synthesized, and silver-bismuth modified composite titanium dioxide is synthesized, so that the high temperature resistance of the composite titanium dioxide is enhanced, and the composite titanium dioxide still keeps excellent antibacterial performance after being sintered at a high temperature; during wet ultrafine grinding, when 2.2-2.8% of a composite dispersant compounded by modified acrylic acid and polyethylene glycol is added, a glaze surface formed after sintering is compact, so that the self-cleaning property of the glaze is greatly improved.

The invention provides a ternary precursor sequentially coated with titanium and aluminum and a preparation method and application thereof. The ternary precursor comprises a ternary precursor core, and the exterior of the ternary precursor core is sequentially coated with a titanium oxide middle layer and an Al (OH) 3 outer layer. The preparation method comprises the following steps: coating a ternary precursor core with a titanium oxide intermediate layer and an Al (OH) 3 outer layer to obtain a ternary precursor, calcining when the ternary positive electrode material is prepared, dehydrating the Al (OH) 3 outer layer to form an Al2O3 outer layer, inhibiting the volume expansion and shrinkage of the core in the ternary positive electrode material by the titanium oxide intermediate layer and the Al2O3 outer layer, and isolating the ternary positive electrode material from an electrolyte, so that the ternary positive electrode material is prepared. The surface side reaction of the ternary positive electrode material is inhibited; besides, through sequential coating of the titanium oxide intermediate layer and the Al2O3 outer layer, a continuous and defect-free compact layer formed during single coating of the titanium oxide intermediate layer and the Al2O3 outer layer can be avoided, so that lithium ion diffusion is facilitated.

The invention belongs to the technical field of wastewater multi-stage treatment, and particularly relates to a titanium dioxide production wastewater multi-stage treatment device which comprises a filter tank, a water inlet pipe is fixedly mounted on one side of the filter tank, a water outlet pipe is fixedly mounted at the bottom of the filter tank, and an electrolysis tank is fixedly mounted at the end, away from the filter tank, of the water outlet pipe. A rotary filtering assembly is arranged in the filtering box, comprises a filtering net and is used for filtering the wastewater through the filtering net. When waste water is filtered through the rotary filtering assembly, the rotary filtering assembly enables the filtering net to rotate at a constant speed, the filtering net rotates at the constant speed so that the waste water can make uniform contact with the filtering net in the filtering box, and after the waste water enters from the water inlet pipe, the waste water is not concentrated in a certain area of the filtering net to be filtered but rotates along with the filtering net; impurities in the wastewater can be gradually intercepted on the surface of the whole filter screen, so that the local filter screen is prevented from being blocked due to too fast accumulation of the impurities.

The invention belongs to the technical field of catalysts, and particularly relates to a catalyst, a preparation method thereof and application of the catalyst in preparation of benzonitrile from oxidized polystyrene. The catalyst is obtained by carrying out heat treatment on a mixture of urea and TiO2, and the specific preparation method comprises the following steps: firstly, dropwise adding a hydrogen fluoride aqueous solution into tetrabutyl titanate, and uniformly mixing to obtain a milk white gel precursor; then putting the milk white gel precursor into a high-pressure kettle, heating for a period of time, cooling to room temperature to obtain a white solid, washing and drying to obtain TiO2 powder; the preparation method comprises the following steps: adding urea into TiO2 powder, uniformly mixing, and calcining the mixture in air at high temperature to obtain the oxygen vacancy-rich catalyst TiO2-Ov-x (Ov represents oxygen vacancy and x represents the mass of urea added corresponding to every 2 g of TiO2 powder, g). The preparation method of the catalyst is simple, and the catalyst still has good stability after being recycled and calcined for 7 times, and has high catalytic activity for oxidizing polystyrene into benzonitrile.

The invention provides a lithium manganese iron phosphate positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of new energy. According to the lithium manganese iron phosphate positive electrode material provided by the invention, the amorphous precursor and the high-crystallization precursor are used as raw materials, and the high-crystallization precursor causes a relatively high specific surface area of the material and affects the processability; the amorphous precursor can improve the compaction density and the specific surface area of the material, and the capacity and the cycle performance of the lithium manganese iron phosphate positive electrode material are ensured by combined use of the two precursors. The combination of elements with different valence states is used, so that the doping and coating effects are achieved at the same time, and the performance of the material is synergistically improved; elements with relatively low valence states are easily doped in a lithium manganese iron phosphate crystal structure, so that the capacity of the material is improved; and elements with relatively high valence states are distributed on the surfaces of lithium manganese iron phosphate particles, so that the stability of the surface structure of the material is improved.

This invention relates to a method for preparing monodisperse doped titanium dioxide with in-situ lattice strain, belonging to the field of nanomaterial dispersion preparation. The titanium dioxide prepared by this method possesses abundant oxygen vacancies and surface active sites. The method employs a secondary titanium source injection followed by a rapid solvothermal reaction with increasing temperature. Lattice strain is controlled by the difference in lattice contraction rates at the amorphous-crystalline interface, reducing the oxygen vacancy formation energy. Doping with low-valence metal ions further stabilizes the oxygen vacancy structure. Surface modifiers can regulate the particle surface properties to adapt to various solvent systems, facilitating the preparation of highly transparent composite functional materials.

To provide a surface-treated inorganic oxide in which the surface of an inorganic oxide such as an inorganic filler or an inorganic pigment is treated with a specific polymer treating agent, and which exhibits enhanced dispersibility, compatibility, and fillability with respect to various media.SOLUTION: Provided is a surface-treated inorganic oxide that is a treated product in which an inorganic oxide is surface-treated with a polymer treating agent. The polymer treating agent is a polymer whose number-average molecular weight is 6,000 to 30,000, including a constitutional unit (1) derived from a monomer 1 represented by general formula (1), a constitutional unit (2) derived from a monomer 2 such as (meth)acryloyloxypropylmethyldimethoxysilane, and an optional constitutional unit (3) derived from a vinyl monomer. (R1 represents a hydrogen atom or a methyl group. A represents O or NH. X represents an ethylene group or a propylene group. Y represents O, NHCOO, or NHCONH. Each R2 independently represents a hydrogen atom or a methyl group. R3 represents an alkyl group having 1 to 18 carbon atoms.)SELECTED DRAWING: None

The invention provides a coated modified lithium cobalt oxide material, a preparation method thereof, a positive electrode and a lithium ion battery. The preparation method comprises the following steps: providing a mixture, wherein the mixture sequentially comprises first lithium cobalt oxide particles, a coating agent and second lithium cobalt oxide particles from bottom to top; sequentially carrying out first mixing, second mixing and third mixing on the mixture; and sintering to obtain the coated modified lithium cobalt oxide material. The D50 particle size of the first lithium cobalt oxide particles is larger than that of the second lithium cobalt oxide particles; the mixing rotating speeds of the first mixing, the second mixing and the third mixing are sequentially increased. In the lithium cobalt oxide coating modification process, the positions of the first lithium cobalt oxide particles, the second lithium cobalt oxide particles and the coating agent in the mixture in the vertical direction are designed to form a sandwich structure, and a three-stage mixing process is combined, so that the mixing uniformity of the coating agent and the lithium cobalt oxide material is remarkably improved, and the coating performance of the lithium cobalt oxide material is improved. And uniform coating of the coating element on the surface of the lithium cobalt oxide material is realized.

The invention discloses a preparation method of high-purity titanium dioxide, which is characterized by comprising the following steps: (1) preparing a titanium solution: slowly adding a titanium tetrachloride solution into deionized water to obtain the titanium solution; (2) heat-preservation hydrolysis: adding an acidic dispersant into the titanium liquid obtained in the step (1), stirring and mixing uniformly at room temperature, heating to 80-85 DEG C, preserving heat, and carrying out hydrolysis reaction for 1-2 hours to obtain hydrolysis slurry; (3) obtaining a precursor: cooling, aging, filtering, washing and drying the hydrolyzed slurry obtained in the step (2) to obtain a metatitanic acid precursor; and (4) calcining: calcining the metatitanic acid precursor obtained in the step (3) at 400 DEG C to obtain the high-purity titanium dioxide. According to the preparation method of the high-purity titanium dioxide, provided by the invention, the high-purity (greater than or equal to 99.9%) titanium dioxide is prepared under mild process conditions of low-temperature hydrolysis and low-temperature calcination, the product yield reaches about 90%, and the obtained high-purity titanium dioxide is spherical titanium dioxide with a rutile structure and has good dispersity.

The invention relates to the technical field of nano titanium oxide preparation processes, and discloses a nano titanium oxide preparation method which comprises the following steps: dissolving cerium nitrate in deionized water to obtain a solution A; dissolving tetrabutyl titanate in absolute ethyl alcohol, adding the solution A, and uniformly stirring to obtain a solution B; dissolving glycerol and hydroxybenzophenone in deionized water, and uniformly stirring to obtain a solution C; slowly dropwise adding the solution B into the solution C, adding citric acid at the same time, and violently stirring to form a mixed solution; adjusting the pH value of the mixed solution to 9.0-10.0 to form a suspension; and carrying out reaction on the suspension at 160-200 DEG C for 6-10 hours. According to the nano titanium oxide prepared by the preparation method disclosed by the invention, the skin feeling of the nano titanium oxide can be remarkably improved, the problems of dryness, thickness, whitening and the like are reduced, and the use satisfaction of consumers is improved.

The invention relates to a method for preparing nanoscale titanium dioxide by a gas-liquid method, which comprises the following steps: (1) introducing a carrier gas carrying titanium tetrachloride gas into an aqueous solution containing a dispersing agent, and hydrolyzing by the gas-liquid method to obtain metatitanic acid slurry; (2) carrying out solid-liquid separation, washing and drying on the metatitanic acid slurry obtained in the step (1) to obtain metatitanic acid; and (3) mixing the metatitanic acid obtained in the step (2) with a pyrolysis aid, and carrying out pyrolysis to obtain the nanoscale titanium dioxide. Nanoscale, high-dispersion and crystal-form-controllable preparation of titanium dioxide is realized by changing the introduction mode of titanium tetrachloride and matching with the dispersing agent and the pyrolysis aid. The titanium tetrachloride is introduced in a gas manner, so that the reaction temperature and speed can be adjusted, and the method has the advantages of improving the reaction efficiency, reducing the reaction temperature, being simple in preparation method, mild in reaction condition and the like.

The invention discloses a palladium-doped Ir-Sn oxide titanium anode with high catalytic activity and a preparation method of the palladium-doped Ir-Sn oxide titanium anode, and belongs to the technical field of electrolytic anodes. The anode comprises a titanium substrate, a TiO2-Ta2O5 intermediate layer and an Ir-Sn-Pd oxide catalyst layer, the molar ratio of Ir to Sn to Pd in the catalyst layer is (5-6): 3: (1-2), and the total metal ion concentration is 0.3 mol L. The preparation method is realized through titanium substrate pretreatment (sand blasting and etching), intermediate layer coating sintering (a TiCl4-TaCl5 solution) and catalyst layer circulating coating sintering (an H2IrCl6-SnCl4-PdCl2 mixed solution). The relatively cheap palladium element is introduced, the electron structure of the catalyst layer is optimized by utilizing the defect effect, the charge transfer resistance is reduced to 6.7 omegacm, and meanwhile, the iridium consumption is reduced by more than 30%. Experiments show that the cell voltage of the anode is stabilized at 0.95 V (the current density is 5Acm <-2 >), the accelerated life reaches 1630 hours, the coating binding force is 62N, and the corrosion rate in an acidic electrolyte is only 0.01 mm / year. Compared with a traditional iridium tantalum anode, the cost is reduced by 40%, and the overpotential in the oxygen evolution reaction is as low as 0.45 V.

The invention relates to the technical field of battery positive electrode materials, discloses a manganese-based battery positive electrode material precursor as well as a preparation method and application thereof, and belongs to the technical field of battery preparation. According to the technology for preparing the manganese-based battery positive electrode material precursor, a solid-phase method is mainly adopted, a high-temperature melting technology is adopted, the manganese-based positive electrode material is subjected to doping modification through multiple elements at the same time, then surface coating is carried out, the density of the synthesized positive electrode material is improved, the structural stability of the synthesized positive electrode material is enhanced, and the morphology, the crystal face and the crystal boundary of the positive electrode material are optimized; the side reaction between the crystal interface of the positive electrode material and electrolyte is inhibited, the service life is prolonged, and the safety performance during use is enhanced. A small amount of water vapor and carbon dioxide gas generated in the preparation process are discharged at high altitude, so that the environment is not polluted.

The invention discloses a Janus-MOF composite material as well as a preparation method and application thereof. The material is formed by heterogeneously integrating an adsorption module and a signal module through a lattice orientation growth method, wherein the adsorption module adopts a zirconium-oxygen cluster and a tetrafluoroterephthalic acid ligand to construct a molecular imprinting pore channel to specifically capture PFAS; the signal module comprises a spiropyrane modified ligand and an electrochemically deposited gold nano needle tip array, and the SERS detection limit reaches 0.05 ppt through photoresponse aperture regulation and three-mode (electromagnetic-chemical-mechanical) synergistic enhancement; the shell layer is doped with titanium dioxide quantum dots, PFAS can be degraded under ultraviolet irradiation, and the substrate can be recycled for more than or equal to 5 times. The invention further provides a surface enhanced Raman spectroscopy (SERS) and electrochemical impedance spectroscopy (EIS) dual-mode coupling technology, the cross validation detection error is less than or equal to 15%, the problems that the traditional method is poor in selectivity, low in sensitivity and incapable of in-situ regeneration are solved, and the method is suitable for rapid detection of trace PFAS in complex matrixes such as food, surface (undersurface) water and industrial wastewater.

The invention relates to the technical field of batteries, in particular to a low-hydrogen-evolution graphene material for a lead-acid battery and a preparation method thereof.The method comprises the steps that firstly, ethidene diamine is grafted to the surface of graphene oxide through a carbodiimide / active ester method, and aminated graphene is obtained; performing heat treatment in a nitrogen / ammonia gas atmosphere to realize nitrogen doping; compounding with titanium dioxide, and carrying out hydrothermal reaction to form a stable structure; then, sequentially grafting imidazolium silane and perfluorodecyl silane to carry out hydrophobic modification; and finally, stabilization and low-temperature re-nitridation curing are carried out through titanium tetrabutoxide. The graphene material prepared by the method endows the battery with excellent performance, and is low in direct-current internal resistance and high in capacity retention ratio.

The invention discloses a multi-element co-coated lithium ion ternary positive electrode material and a preparation method thereof, the multi-element co-coated lithium ion ternary positive electrode material comprises an inner core and a shell, the inner core is a high-nickel ternary positive electrode material NCM, the nickel content is greater than or equal to 80%, and the median particle size D50 of the powder is 6-12 [mu] m; the shell is a composite coating layer and coats the surface of the inner core, the composite coating layer comprises LATP, TiO2 and AlPO4, the total mass of the composite coating layer accounts for 0.5%-3% of the mass of the inner core, and the mass ratio of the LATP to the TiO2 to the AlPO4 is (80%-90%): (12%-6%): (8%-4%). The surface of the ternary material is simultaneously coated with a layer of LATP, TiO2 and AlPO4 spontaneously at one time through a hydrothermal method, so that the contact between the ternary material and an electrolyte is reduced, the surface lithium ion mobility is improved, the polarization is reduced, and the cycling stability and safety of the material are further improved.

The invention discloses a preparation method and application of an iridium ruthenium nanoparticle modified superfine nanowire titanium oxide acidic water electrolysis catalyst. By combining hydrothermal morphology regulation and control, molten salt mediated nanoparticle loading and component coordinated regulation and control, the catalytic performance and durability of the catalyst are remarkably improved (the oxygen evolution overpotential of the catalyst in 0.5 M H2SO4 and under the current density of 10 mAcm <-2 > is only 167 mV (vs.RHE), and the activity of the catalyst after continuous operation for 100 hours under the constant potential of 1.5 V is attenuated by 1t; compared with the traditional IrO2, the catalyst has the advantages that the catalyst is simple in preparation process and low in cost, the use amount of precious metal Ir can be remarkably reduced, the Ir loading capacity is reduced to 0.1 mg / cm < 2 > (reduced by 80% compared with that of traditional IrO2), the process economy is extremely high, the bottleneck that activity and durability of a traditional low-precious-metal catalyst are difficult to consider is remarkably broken through, and an efficient and low-cost solution is provided for green large-scale hydrogen energy preparation.

The invention relates to the technical field of electrochemical analysis and detection, in particular to a sensitive detection tert-butylhydroquinone modified glassy carbon electrode, a preparation method and application, the sensitive detection tert-butylhydroquinone modified glassy carbon electrode has high specific surface area and catalytic activity and good conductivity, sensitive detection of tert-butylhydroquinone can be achieved, and the application range is wide. The modified glassy carbon electrode comprises a glassy carbon electrode and a compound coating, the compound coating wraps the surface of the glassy carbon electrode, and the compound coating is composed of graphene oxide and a Ti-based MOF derivative; the preparation method comprises the following steps: (1) preparing MIL-125 (Ti); (2) preparation of TiO2 / NC; (3) preparation of 15% GO (at) TiO2 / NC; (4) preparing a dispersion liquid of the prepared 15% GO-coated TiO2 / NC composite material; (5) manufacturing a modified electrode; the application comprises the following steps: S1, establishing a concentration-electrochemical response signal relationship; and S2, measuring the concentration of the to-be-measured substance.

The invention discloses a sodium-ion battery positive electrode material preparation system, and relates to the technical field of sodium-ion battery production, and the sodium-ion battery positive electrode material preparation system comprises a raw material intelligent management and control module, an equipment linkage control module, a sintering process precise regulation and control module, a quality online monitoring module and a data management and analysis module; through high-precision automatic weighing and closed conveying of the raw material intelligent management and control module, the raw material matching precision is improved, material loss is reduced, by means of a collaborative logic algorithm of the equipment linkage control module, the material circulation efficiency is improved, the production period is shortened, and by means of dynamic regulation and control of the sintering process precise regulation and control module, the production efficiency is improved. The sintering qualified rate is improved, the product batch quality difference is reduced, unqualified products are reduced by using real-time detection and feedback of the quality on-line monitoring module so as to reduce the production cost, process optimization, quality tracing and energy consumption monitoring are realized through the data management and analysis module, the comprehensive energy consumption is reduced, and the production efficiency is improved. And large-scale, high-quality and low-cost production of the sodium-ion battery positive electrode material is realized.

The present application provides a precursor of a positive electrode active material. The particles of the precursor include a core and a shell covering the core. The materials of the core and the shell are both nickel-cobalt-manganese oxide or nickel-cobalt-manganese hydroxide. The core is doped with a flux, and the flux is selected from one or more of the oxides, carbonates, and hydroxides of Sr, Li, Mg, Ni, Co, and Zr. The shell is doped with a reaction restraining agent. The reaction restraining agent is selected from one or more of the lithium compounds, oxides, carbonates, and hydroxides of Ta, W, Al, Mn, Mo, and La. The core of the precursor particles is provided with a flux and the shell is provided with a reaction restraining agent, so that the subsequent crystallization of the precursor develops in a direction from the inside to the outside. The present application also provides a positive electrode active material and a preparation method thereof, including a positive electrode of the positive electrode active material and a lithium ion battery, and a preparation method of the precursor.

The invention discloses a preparation method and application of an S-type heterostructure material with a plasma resonance effect, and the preparation method comprises the following steps: grinding a precursor material, calcining, collecting solid powder, carrying out reflux purification in deionized water, and collecting white powder; dispersing the white powder in a hydrazine hydrate solution, carrying out solvothermal reaction to obtain a faint yellow solution, repeatedly dissolving and precipitating by respectively using acidic and alkaline reagents, washing and drying to obtain a faint yellow solid product; uniformly grinding the faint yellow solid product, calcining the faint yellow solid product in an atmosphere furnace, and cooling to obtain orange solid powder; and adding the orange solid powder into an organic solvent of a precursor containing a tungsten source, and centrifuging, washing and drying after the solvothermal reaction is finished to obtain the S-type heterostructure material with the plasma resonance effect. The S-type heterostructure material with the plasma resonance effect has relatively high efficiency for simulating separation and removal of uranium species in post-treatment wastewater and shows relatively good anti-radiation stability.

This invention belongs to the field of microwave absorbing material preparation technology, and discloses a two-step partial oxidation method to improve the microwave absorption performance of MXene materials. By performing hydrothermal pre-oxidation and heat treatment on MXene materials, oxide nanoparticles are grown in situ on their surface, achieving controllable partial oxidation. The MXene matrix retains a two-dimensional layered structure, and a heterogeneous interface is formed between the oxide nanoparticles and the MXene matrix. This adjusts the conductivity, optimizes impedance matching, enhances interface polarization, improves microwave absorption performance, and provides high-temperature stability.

The invention relates to the field of heterogeneous catalysis, in particular to a method for preparing benzaldehyde by oxidizing benzyl alcohol. The method comprises the following steps: (A) mixing a benzyl alcohol solution and a TiO2 catalyst to obtain a mixed solution; wherein the TiO2 catalyst is TiO2 of which a {001} crystal face is exposed; (B) transferring the mixed solution into a reactor, introducing oxygen under a dark condition, and stirring until adsorption and desorption balance is achieved; and (C) irradiating ultraviolet light into the reactor, and carrying out photocatalytic oxidation reaction to form benzaldehyde. The method is a green and efficient catalytic method for effectively improving the selectivity of the benzyl alcohol oxidation reaction and increasing the yield of benzaldehyde by regulating and controlling the crystal face of the catalyst TiO2. The TiO2-{001} crystal face is used as the catalyst, the selectivity of benzaldehyde reaches 91.5%, the conversion rate of benzyl alcohol can reach 94.3%, and the selectivity of benzaldehyde is remarkably improved while the conversion rate is guaranteed.

The invention discloses a bimorph TiO2 composite carbon material which is prepared by the following steps: by taking Ti3AlC2 as a raw material, preparing single-layer Ti3C2Ox through HF etching, compounding the single-layer Ti3C2Ox with a titanium-based metal organic framework MIL-125 through a hydrothermal reaction, and finally, oxidizing and then carbonizing to obtain the bimorph TiO2 composite carbon material, namely TiO2 / C-TiO2 for short. The basic microstructure of TiO2 / C-TiO2 is in the shape of a round cake, and the size of a single round cake is 0.5-1 [mu] m; and rutile type TiO2 and anatase type TiO2 exist in the TiO2 / C-TiO2 at the same time. The preparation method comprises the following steps: 1, preparing single-layer Ti3C2Ox; 2, preparation of Ti < 3 > C < 2 > O < x > / MIL-125; and 3, the preparation of TiO2 / C-TiO2 is carried out. When the positive electrode material is used as a lithium-sulfur battery positive electrode material, the initial discharge specific capacity is 1200-1300mA h g <-1 > under the condition that the current density is 0.2 C; and under the condition that the current density is 0.2 C, after 200 times of charge-discharge cycles, the residual specific capacity is 700-800 mA h g <-1 >, and the capacity retention ratio is 55-60%.

This invention relates to a modified titanium dioxide for matting polyester fibers and its preparation method. The modified titanium dioxide comprises a mesoporous titanium dioxide core and a cysteine ​​graft layer grafted into the pores of the mesoporous titanium dioxide. The mesoporous titanium dioxide core is prepared by evaporation-induced self-assembly using an alkenyl sulfonate surfactant as a liquid crystal template and tetraethyl or tetrabutyl titanate as the titanium source. Due to the self-polymerization reaction of the alkenyl sulfonate, the resulting polyalkenyl sulfonic acid compound reduces the crystallinity of the mesoporous titanium dioxide, thereby significantly reducing its photocatalytic activity. The mesoporous titanium dioxide is mixed with cysteine ​​and heated to graft cysteine ​​into its pores. The presence of cysteine ​​results in the modified titanium dioxide exhibiting both good matting properties and suppressed photocatalytic activity, preventing fiber structure damage from prolonged ultraviolet irradiation when applied to polyester fibers.

The invention relates to a method for separating iron, vanadium and titanium dioxide in vanadium titano-magnetite or titanium concentrate through a wet method, and belongs to the technical field of chemical engineering. The method comprises the following steps: (a) mixing vanadium titano-magnetite or titanium concentrate with sulfuric acid with the concentration of 22-30wt.% to obtain mixed slurry; (b) treating the mixed slurry at 150-200 DEG C and 2-4 MPa under the condition that the Reynolds number is gt; reacting in a turbulent flow state of 4000, so that non-titanium elements are dissolved to generate sulfate; (c) carrying out solid-liquid separation on the reaction product in the step (b) to obtain a high-grade titanium-rich material and waste liquid; (d) the titanium-rich material reacts with a sodium hydroxide solution, silicon in the titanium-rich material is removed, and a sodium silicate solution is generated; and (e) reacting the silicon-removed titanium-rich material with a hydrochloric acid solution with the mass concentration of less than 15%, cleaning, carrying out solid-liquid separation, and calcining to obtain anatase or rutile titanium dioxide. According to the method, all iron, vanadium and titanium elements in the vanadium-titanium-iron concentrate and the titanium concentrate are recycled.

The invention relates to the field of waste treatment, in particular to a titanium dioxide nanotube as well as a preparation method and application thereof. The nanotube is in an anatase crystal form, the tube diameter is 10 nm to 10 [mu] m, the specific surface area is 39.81-151.77 cm < 2 > / g, and the titanium dioxide nanotube has a mesoporous and microporous structure. The catalyst can be used as a catalyst for photo-thermal synergistic catalytic degradation of a refrigerant, has high reaction activity in photo-thermal synergistic catalytic degradation of the refrigerant, and realizes effective degradation with low temperature, low energy consumption, large flow, high speed and high refrigerant component proportion.