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2606 results about "Anodic oxidation" patented technology

Anodic oxidation is an electrochemical method for the production of an oxide film on a metallic substrate. It removes electrons from a substance and oxidizes the anode. ... Anodic oxidation is an accelerated electrochemical oxidation process, which is intensified by the natural oxide skin of the metal. It involves the application of an electrical bias at relatively low currents while the substrate is immersed in an acid bath.

Apparatus and process for mediated electrochemical oxidation of materials

A unique apparatus unique apparatus and process that uses mediated electrochemical oxidation (MEO) for: (1) Destruction of: a) nearly all organic solid, liquid, and gases materials, except fluorinated hydrocarbons; b) all biological solid, liquid, and gases materials; c) and/or dissolution and decontamination (such as cleaning equipment and containers, etc.) of nearly all inorganic solid, liquid, or gas where higher oxidation states exist which includes, but is not limited to, halogenated inorganic compounds (except fluorinated), inorganic pesticides and herbicides, inorganic fertilizers, carbon residues, inorganic carbon compounds, mineral formations, mining tailings, inorganic salts, metals and metal compounds, etc.); and d) combined materials (e.g. a mixture of any of the foregoing with each other); henceforth collectively referred to as materials. (2) Sterilization/disinfection of equipment, glassware, etc., by destroying all existing infectious materials. (3) Dissolution of transuranic/actinide materials and/or destruction of the oxidizable components in the hazardous waste portion of mixed waste. (4) Generation of hydrogen and oxygen from MEO of materials. (5) Alteration of organic, biological, and inorganic materials by MEO to produce other compounds from these materials. The materials are introduced into an apparatus for contacting the materials with an electrolyte containing the oxidized form of one or more reversible redox couples, at least one of which is produced electrochemically by anodic oxidation at the anode of an electrochemical cell. The oxidized forms of any other redox couples present are produced either by similar anodic oxidation or reaction with the oxidized form of other redox couples present and capable of affecting the required redox reaction. The oxidized species of the redox couples oxidize the materials molecules and are themselves converted to their reduced form, whereupon they are reoxidized by either of the aforementioned mechanisms and the redox cycle continues until all oxidizable material species, including intermediate reaction products, have undergone the desired degree of oxidation. The entire process takes place at temperatures between ambient and approximately 100° C. The oxidation process may be enhanced by the addition of reaction enhancements, such as: ultrasonic energy and/or ultraviolet radiation.

Ag/AgCl/TiO* nanotube array plasma visible-light photocatalyst and preparation method thereof

The invention discloses an Ag/AgCl/TiO2 nanotube array plasma visible-light photocatalyst and a preparation method thereof. Aperture, tube wall thickness, and tube length of a TiO2 nanotube in the photocatalyst are 90-120nm, 10-20nm, and 500-600nm respectively, particle size of Ag/AgCl inside the TiO2 nanotube is 10-30nm. The preparation method comprises the following steps: first anodizing a metallic titanium sheet in sodium fluoride and phosphoric acid solution, generating a TiO2 nanotube array of amorphous state on the titanium sheet surface, and then converting an amorphous phase into an anatase phase by calcining the TiO2 nanotube array. Then soaking the anatase TiO2 nanotube array in HC1 and AgNO3 solution sequentially so that the AgC1 nano-particles can deposit on tube walls of the TiO2 nanotubes, thus generating a AgC1/TiO2 nanotube array, and then irradiating the AgC1/TiO2 nanotube array with UV light to reduce partial Ag<+> on surface of AgC1 particles to metallic silver to obtain the Ag/AgCl/TiO2 nanotube array. The photocatalyst has high visible light photocatalytic activity. The method has low preparation cost, is environmentally friendly, and has simple operations. The method can be also used to prepare other Ag/silver halide/TiO2 nanotube array plasma photocatalysts.
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