359 results about "Iron doped" patented technology

The invention discloses a method for preparing iron-doped nitrogen-doped nanometer titanium dioxide powder. The preparation method comprises the steps of preparing titanium tetrachloride raw material to be hydrosol, aging the hydrosol, adding water for dilution, doping water-soluble iron salt, raising temperature to hydrolyze sol and produce precipitate, filtering the precipitate, using water to wash the precipitate, drying the precipitate, obtaining iron-doped nanometer titanium dioxide powder, mixing and then ball-milling nitrogen salt and the iron-doped nanometer titanium dioxide powder, calcining the ball-milled powder, and cooling the powder to obtain the iron-doped nitrogen-doped nanometer titanium dioxide powder. The preparation method combines a chemical method with a physical method so as to allow iron to uniformly enter a crystal lattice structure of titanium dioxide on the one hand, and to uniformly distribute nitrogen in surface layers of nanometer particles, particularly non-crystallization layers on the other hand. The iron-doped nitrogen-doped nanometer titanium dioxide powder can improve the photocatalysis efficiency of titanium dioxide on the one hand, and can expand the photoresponse wavelength of titanium dioxide so as to greatly improve photocatalysis properties.

The invention relates to a single-step hydrothermal micro-emulsion method for preparing iron-doped nano titanium dioxide powder. The single-step hydrothermal micro-emulsion method specifically comprises the following steps of constituting water-in-oil W / O type micro-emulsion by using alkylphenol ethoxylates (OP-10) as a surfactant, using n-butyl alcohol (C4H9OH) as a cosurfactant, using cyclohexane (C6H12) as an oil phase, using butyl titanate (Ti(OC4H9)4) as a titanium source and using hydrochloric acid (HCl) liquor of ferric chloride (FeCl3.6H2O) as a water phase; uniformly stirring, and transferring into a lined polytetrafluoroethylene reaction kettle for keeping heat for 1 hour-5 hours at a constant temperature of 120 DEG C-160 DEG C, naturally cooling to the room temperature; and washing, separating and drying to prepare the iron-doped nano titanium dioxide powder. According to the single-step hydrothermal micro-emulsion method disclosed by the invention, the iron-doped titanium dioxide is obtained by directly reacting in a low-temperature liquid phase, the preparation process is simple, and the prepared iron-doped nano TiO2 powder is controllable in dimension, uniform in size and provided with average diameter of 10 nm-25 nm; moreover, the iron-doped nano TiO2 powder is expected to be widely applied in the fields such as hydrogen production by photodecomposition of water, degradation of organic pollutants, and the like.

The invention provides a preparation method of an iron-doped nanometer zinc oxide crystal, aiming at overcoming the shortcoming of the traditional photocatalytic property and particularly solving the problem that the photocatalytic activity is hardly available in a visible light region. The preparation method has the advantages of simplicity, low cost and rapid reaction speed; and the nanometer zinc oxide prepared by the invention has very good photocatalysis capability in the visible light and the grain size of 5 nanometers to 50 nanometers and can be used for preparing high-performance materials related to solar energy.

The invention discloses a method used for preparing iron-doped SBA-15 mesoporous molecular sieve under neutral conditions via one-step method, and belongs to the technical field of mesoporous molecular sieve synthesis. According to the method, Fenton reagent is added into an ethyl orthosilicate aqueous solution for hydrolysis, an obtained product is uniformly mixed with an organic template agent P123 aqueous solution, free radical reaction is induced by hydroxyl free radicals generated by Fenton reagent, the presence of a ferric salt is beneficial for realizing of charge matching effect and self-assembling between the organic template agent and an inorganic silicon source under neutral conditions, so that preparation of the Fe-SBA-15 mesoporous molecular sieve material is realized. According to the method, the Fe-SBA-15 mesoporous molecular sieve with excellent order degree is prepared via one-step method without adding inorganic strong acid, so that synthesis of metal-doped mesoporous materials under soda acidic or alkaline conditions or via complex post-treatment is avoided. The method is capable of providing industrialized production of iron-doped SBA-15 mesoporous molecular sieve with new ideas, providing widened industrialized applications of mesoporous molecular sieve materials with conditions, and possesses industrialized application value.

The invention discloses a potentiometric hydrogen sensor using strontium and iron-doped lanthanum chromate as a sensitive electrode and a manufacturing method of the potentiometric hydrogen sensor. The potentiometric hydrogen sensor uses La<1-x>Sr<x>Cr<1-y>FeyO<3-delta> as a sensitive electrode, Pt as a reference electrode, and YSZ or GDC as a solid electrolyte, wherein x is more than or equal to 0.1 and less than or equal to 0.6, and y is more than or equal to 0.3 and less than or equal to 0.7. The potentiometric hydrogen sensor disclosed by the invention uses a perovskite structure oxide La<1-x>Sr<x>Cr<1-y>FeyO<3-delta>, which has relatively good electrochemical catalytic activity to hydrogen, as a sensitive electrode, so that the sensor can have a relatively high response value to hydrogen; and YSZ or GDC is used as an electrolyte, so that the gas sensitivity and long-term stability of the sensor can be improved.