373 results about "Hydrogen dioxide" patented technology

The invention relates to a treatment method for antibiotic pharmaceutical waste water integrated with photocatalyst oxidation reaction and membrane separation. Wherein, taking flocculations, coarse filter and adjust pH value to the waste water putting the water into photocatalyst oxidation reactor with particle titania as catalyst, ultraviolet light as light source and ozone, hydrogen dioxide or chlorine dioxide as oxidizer; degradating organic in water; forcing the waste water into membrane separator to catch most inorganic salt and organic of 97% removal ratio and 98% desalinization ratio and satisfy the recycle standard. This method has high efficiency and the yielding water is colourless and clear.

The invention relates to chemical technical field, in particular to a method for using magnesia catalyst to catalyze and oxidize cyclone to synthesize lactone. The invention uses some nanometer sheet magnesia compound as catalyst, uses mixture of cyanobenzene and 1, 4-dioxane at a certain proportion as solvent, at a special reaction temperature, to catalyze and oxidize cyclone to synthesize lactone compound. The invention uses commercial cyclopentanone, cyclohexanone and adamantaneketone as raw materials, at mild condition, to reach the total yield of lactone compound more than 90%. The invention uses hydrogen dioxide water solution as oxidant, to eliminate the environment pollution of traditional oxidation process as peroxyacid, to realize environment-friend catalysis conversion. The invention has low cost, which can be used for industrialized lactone compound production.

The invention discloses a making method of nanometer crystal Li-Ti composite oxide, which comprises the following steps: adopting titanium powder or titanium compound as raw material; blending the materials with 30% hydrogen peroxidate under low temperature; adding certain quantity of lithium salt solution and moulder; stirring evenly; reacting under water bath condition at 50-100 deg. c completely; drying the composite system directly to produce predecessor; proceeding heat disposal for the predecessor at 200-400 deg. c for 2-6h; heating to 600-1000 deg. c; sintering 8-36h; cooling; grinding; obtaining the nanometer crystal Li-Ti composite oxide with spinel structure and the content of Li4Ti5O12 over 90%; controlling the even grain size of the product between 15nm and 100nm and specific surface area between 10 and 100m2 / g due to different aperture shape of moulds, sintering time and temperatures; making the reversible specific capacity of the product over 160mAh / g under 0. 1C charging and discharging condition; keeping the capacity maintaining rate between 50% and 70% under discharging condition at 100deg. c as ideal negative electrode material of lithium ion dynamic battery and lithium ion super-capacitance.

The invention provides a faradic electrical FenDun method of removing the non-degradable organic matter in water, applying the faradic ferro-electricity to the electrical FenDun reaction, the ferrous iron ion dissolving out from the surface of iron electrode through oxidation-reduction reaction and electrochemical faradic reaction in electrolytic process and reacting with hydrogen dioxide generated on the cathode surface, that is FenDun reaction, generating hydroxyl free radical with high effect to degrade the organic matter in water. The invention also provides a device applying the faradic electrical FenDUN reaction to remove organic substance in water, which comprises: the reactor employing shape stable electrode as anode, employing activated charcoal fiber as cathode, putting the iron faradic electrode of certain area between the anode and cathode and venting a certain quantity of oxygen to the cathode surface. Adding organic wastewater with pH being about 3 into reactor and importing current flow for electrolysis to remove pollutant. The invention employs oxidation-reduction reaction and electrical chemical reaction to generate the ferrous iron ion gradually needed for FenDun reaction which reacts with the hydrogen dioxide generated by electrochemical reaction to generate the FenDUn reaction which generates the hydroxyl free radical with high effect to degrade the organic matter in water and realizes the purpose of removing pollutant.

The invention discloses a method of removing the non-degradable organic substance in the water by catalyzed oxidation with high-voltage discharging, comprising applying the high-voltage pulse between the high voltage electrode 2 and earth electrode 4 in the reaction container with water by high voltage impulse power source 3, and at the same time adding oxygen, ozone, powdered activated carbon, transition metal oxide, hydrogen dioxide or transition metal ion to catalyze and oxygenize the organics. The process of removal of non-degradable organic is reinforced because of the existing of diverse catalyst and the efficiency of removal is greatly improved.

The invention discloses a chemical transmission film preparing technology of magnesium alloy, which comprises the following steps: a. proceeding degreasing disposal for magnesium or magnesium alloy through sodium hydroxide or one or multiple hybrid solutions of sodium phosphate with sodium hydroxide, sodium carbonate and sodium silicate solution; b. proceeding acid cleaning disposal for degreased magnesium or magnesium alloy through hybrid solution of phosphoric acid and sodium phosphate; c. proceeding activating disposal for acid cleaned magnesium or magnesium alloy through hybrid solution of fluohydric acid and sodium phosphate; d proceeding chemical synthesizing disposal for activated magnesium or magnesium alloy through composite solution of calcium nitrate hydrate, sodium nitrite, sodium iodide and hydrogen dioxide solution; e. packing hole of synthetic magnesium or magnesium alloy through deionized water. The invention doesn't utilize chromic composition, which eliminates danger for environment.

The invention provides a process for preparing tert-butyl hydroperoxide, which comprises contacting tert-butanol and hydrogen dioxide by the mol ratio of 0.5-10 for 0.5-10hours at 40-100 deg. C at the presence of titanium-silicon molecular screen, the content of titanium-silicon molecular screen is 0.005-0.1g molecular screen in each one ml of reaction liquid.

The invention provides a preparation method of a carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode. The preparation method comprises: a metal salt of Ni, Co or Cu and a surfactant are fully dissolved in pure water, so that the concentration of Ni<2+>, Co<2+> or Cu<2+> in the solution is 0.05 mol / L to 0.5 mol / L, and the concentration of the surfactant in the solution is 0 mol / L to 2.0 mol / L; a three-electrode system is formed by Ni foam or a stainless steel wire as a working electrode, a platinum electrode as a counter electrode and a silver-silver chloride electrode as a reference electrode; and with an electrochemical method, an active component choosing from Ni, Co or Cu is deposited on an Ni foam substrate or a stainless steel wire substrate to form the carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode, and the electro-deposition time is 5 s to 200 s. The method of the invention is simple, has strong operability, has wide sources of the raw materials, and can be widely applied to the preparation of a DPPFC (direct hydrogen dioxide fuel cell) anode.

The invention provides a diamond wire cutting-based silicon wafer texturing pretreatment method. The method comprises the following steps: a, mixing a hydrofluoric acid solution, a hydrogen dioxide solution, metal salt and water to obtain pretreatment liquid; b, putting a silicon wafer cut by a diamond wire into the pretreatment liquid and performing pretreatment A, until cutting lines on the silicon wafer are basically removed; c, cleaning the silicon wafer subjected to pretreatment A by an acid solution, so as to remove metal particles on the silicon wafer; d, putting the silicon wafer cleaned by the acid solution into the pretreatment liquid and performing pretreatment B, and forming a pretreatment texturing surface with a uniform micro / nano structure on the silicon wafer. The invention also provides a diamond wire cutting-based silicon wafer texturing method.