Abstract: The invention relates to a method and a device for producing diluted hydrofluoric acid using an electrode arrangement (1), which has an anode chamber (2) with an anode (4) and a cathode chamber (6) with a cathode (8), which are separated from one another by an anion exchange membrane (10), wherein in the method—pure water is guided through the anode chamber (2), —pure water, which includes at least one electrolyte which forms fluoride ions (F?), is guided through the cathode chamber (6), —and an electrical voltage is applied between the anode (4) and the cathode (8) such that the fluoride ions (F?) are moved through the anion exchange membrane (10) into the anode chamber (2), and an electrical current flows.

Abstract: An apparatus for electrochemical treatment of wastewater has at least one electrolysis cell through which the wastewater to be treated is guided. The electrolysis cell has a multitude of electrode assemblies that have electrodes arranged such that the wastewater to be treated is guided through holes in the electrodes. At least one of the electrode assemblies has three electrodes arranged such that the wastewater to be treated is guided through all the electrodes.

Abstract: The invention relates to an electrode arrangement (10) for electrochemically treating a liquid. The electrode arrangement (10) has two electrodes (2), each of which has at least one electrode surface (4) and at least one through-flow chamber (34) with at least one inlet (22) and at least one outlet (24). The at least one through-flow chamber (34) is delimited on at least one first face by at least one electrode (2) which has a structure (8) on its electrode surface (4) such that a distance between the electrode surface (4) and a second through-flow chamber (34) face lying opposite the first face is varied.

Abstract: The invention relates to a method for electrochemically producing electrolyzed water in an electrode arrangement (10) which has an anode chamber and a cathode chamber that are separated by an ion-selective membrane (30). The anode chamber is delimited on at least one side by at least one anode (2), and the cathode chamber is delimited on at least one side by at least one cathode (2). In the method: a) water, in particular distilled water or ultra purified water, in which an electrolyte is located, is conducted through the anode chamber, b) water, in particular distilled water or ultra purified water, is conducted through the cathode chamber, c) the water, in particular the distilled water or the ultra-purified water, is mixed and in particular set into a turbulent flow in the anode chamber and/or cathode chamber, and d) an electric voltage is applied to the anode and the cathode such that electrolyzed water is produced in the cathode chamber.

Abstract: The invention relates to a method for producing a diamond electrode, which comprises the following steps: a) providing a main body (2) composed of silicon, the dimensions of which are greater than the dimensions of the diamond electrode (22) to be produced, b) etching at least one recess (10) into the surface of the main body (2), c) introducing predetermined breaking points (18) into the main body (2), d) coating the main body (2) with diamond, e) breaking the diamond electrode (22) out of the main body (2) along the predetermined breaking points (18).

Abstract: A diamond layer can be applied stably onto a graphite substrate in a CVD process when the graphite substrate is subjected to the following pretreatment steps before the CVD process: fine cleaning of the surface in a vacuum at a temperature >500° C., preferably >800° C., in an etching gas atmosphere, mechanical removal of loose particles, seeding of the substrate surface with very small diamond particles and at least one degassing treatment in a vacuum to remove adsorbed hydrocarbons and adsorbed air at a temperature T>500° C., preferably T>700° C.

Abstract: Diamond electrodes with improved adhesion of the diamond layer to the electrode are produced by sandblasting a surface of the electrode body, and then non-oxidatively etching the roughened (sandblasted) surface so as to remove at least 5 ?m of material from under the roughened surface. By removing at least 5 ?m of material, the sand particulates in the surface of the electrode body are eliminated, and damage in the form of cracks in the electrode body which result from sandblasting is reduced or eliminated, and further, a surface metal oxide coating is not created. All of these contribute to preparing a surface where spalling of the diamond layer is less likely to occur. Concentrated phosphoric acid is an exemplary non-oxidative etchant used in the process.

Abstract: The invention relates to an electrode assembly for the electrochemical treatment of liquids with a low conductivity. Said assembly comprises electrodes (1, 2), between which a polymer solid electrolyte (3) is situated. The electrodes are pressed against one another by means of a compression device (9, 10; 91) and are configured in such a way that the assembly can be traversed by the liquid. To produce said assembly simply and to ensure that it is flexible and easy to use, the compression device (9, 10; 91) is supported on the electrodes (1, 2).