The invention relates to a method for producing an alkali metal alcoholate solution L.sub.1 in an electrolysis cell E which comprises at least one cathode chamber K.sub.K, at least one anode chamber K.sub.A, and at least one central chamber K.sub.M lying therebetween. The interior I.sub.KK of the cathode chamber K.sub.K is separated from the interior I.sub.KM of the central chamber K.sub.M by a separating wall W comprising at least one alkali-cation-conductive solid ceramic electrolyte (=AFK) F (e.g. NaSICON). F has the surface O.sub.F. A part O.sub.A/MK of the surface O.sub.F directly contacts the interior I.sub.KM, and a part O.sub.KK of the surface O.sub.F directly contacts the interior I.sub.KK. The surface O.sub.A/MK and/or the surface O.sub.KK comprises at least one part of a surface O.sub.F?. O.sub.F? is produced from a pre-treatment step in which F is produced from an AFK F comprising the surface O.sub.F. For this purpose, AFK is removed from F by carrying out a compressed air blasting process on the surface O.sub.F using a solid blasting agent N, and the AFK F with the surface O.sub.F comprising the surface O.sub.F? formed by the compressed air blasting process is obtained. During the electrolysis process for producing the alkali metal alcoholates with F instead of F, an improved conductivity is provided, whereby for a constant current density, a lower voltage can be used.

The invention relates to a method for producing an alkali metal alcoholate solution L.sub.1 in an electrolysis cell E which comprises at least one cathode chamber K.sub.K, at least one anode chamber K.sub.A, and at least one central chamber K.sub.M lying therebetween. The interior I.sub.KK of the cathode chamber K.sub.K is separated from the interior I.sub.KM of the central chamber K.sub.M by a separating wall W comprising at least one alkali-cation-conductive solid ceramic electrolyte (=AFK) F (e.g. NaSICON). F has the surface O.sub.F. A part O.sub.A/MK of the surface O.sub.F directly contacts the interior I.sub.KM, and a part O.sub.KK of the surface O.sub.F directly contacts the interior I.sub.KK. The surface O.sub.A/MK and/or the surface O.sub.KK comprises at least one part of a surface O.sub.F?. O.sub.F? is produced from a pre-treatment step in which F is produced from an AFK F comprising the surface O.sub.F. For this purpose, AFK is removed from F by carrying out a compressed air blasting process on the surface O.sub.F using a solid blasting agent N, and the AFK F with the surface O.sub.F comprising the surface O.sub.F? formed by the compressed air blasting process is obtained. During the electrolysis process for producing the alkali metal alcoholates with F instead of F, an improved conductivity is provided, whereby for a constant current density, a lower voltage can be used.

A method for creating a metal-carbon composite. In one embodiment, the method includes the steps of providing a polymer Schiff base transition metal film precursor having a chemical structure of the formula [M(Schiff)].sub.n and a recurring unit and a transition metal selected from the group consisting of nickel, palladium, platinum, cobalt, copper, iron; Schiff is a tetradentate Schiff base ligand selected from the group consisting of Salen (residue of bis(salicylaldehyde)-ethylenediamine), Saltmen (residue of bis(salicylaldehyde)-tetramethylethylenediamine, Salphen (residue of bis-(salicylaldehyde)-o-phenylenediamine), a substituent in a Schiff base is selected from the group consisting of H, and carbon-containing substituents, preferably CH.sub.3, C.sub.2H.sub.5, CH.sub.3O, C.sub.2H.sub.5O, and Y is a bridge in a Schiff base depositing the polymer Schiff base transition metal precursor film onto a support substrate; and heating the polymer Schiff base transition metal precursor film and support substrate in a furnace in an inert atmosphere.

A method for directly preparing a trivalent chromium compound by electrochemical oxidation of ferrochrome is provided. The method includes: putting ferrochrome as an anode, and placing the anode into an electrolyte solution containing a complexing agent together with a cathode, then turning on a power supply for electrolysis reaction so that chromium and iron in ferrochrome are directly converted into free Cr.sup.3+ and Fe.sup.3+ respectively, allowing one of Cr.sup.3+ and fe.sup.3+ to form a stable soluble metal complex together with the complexing agent, and allowing the other of Cr.sup.3+ and Fe.sup.3+ to form a metal hydroxide solid together with OH.sup. generated by electrolysis reaction, so as to obtain an electrolysis completion slurry. Compared with the prior art, the present application has no hexavalent chromium salt stage, thereby shortening the process flow and avoiding the generation of chromium-containing waste residue.

A method for directly preparing a trivalent chromium compound by electrochemical oxidation of ferrochrome is provided. The method includes: putting ferrochrome as an anode, and placing the anode into an electrolyte solution containing a complexing agent together with a cathode, then turning on a power supply for electrolysis reaction so that chromium and iron in ferrochrome are directly converted into free Cr.sup.3+ and Fe.sup.3+ respectively, allowing one of Cr.sup.3+ and fe.sup.3+ to form a stable soluble metal complex together with the complexing agent, and allowing the other of Cr.sup.3+ and Fe.sup.3+ to form a metal hydroxide solid together with OH.sup. generated by electrolysis reaction, so as to obtain an electrolysis completion slurry. Compared with the prior art, the present application has no hexavalent chromium salt stage, thereby shortening the process flow and avoiding the generation of chromium-containing waste residue.

The invention relates to a method for producing an alkali metal alcoholate solution L.sub.1 in an electrolysis cell E which comprises at least one cathode chamber K.sub.K, at least one anode chamber K.sub.A, and at least one central chamber K.sub.M lying therebetween. The interior I.sub.KK of the cathode chamber K.sub.K is separated from the interior I.sub.KM of the central chamber K.sub.M by a separating wall W comprising at least one alkali-cation-conductive solid ceramic electrolyte (=AFK) F (e.g. NaSICON). F has the surface O.sub.F. A part O.sub.A/MK of the surface O.sub.F directly contacts the interior I.sub.KM, and a part O.sub.KK of the surface O.sub.F directly contacts the interior I.sub.KK. The surface O.sub.A/MK and/or the surface O.sub.KK comprises at least one part of a surface O.sub.F. O.sub.F is produced from a pre-treatment step in which F is produced from an AFK F comprising the surface O.sub.F. In the pre-treatment step, AFK is removed from F by sputtering the surface O.sub.F using noble gas cations N+, and the AFK F with the surface O.sub.F comprising the surface O.sub.F formed by the sputtering process is obtained. During the electrolysis process for producing the alkali metal alcoholates with F instead of F, an improved conductivity is provided, whereby for a constant current density, a lower voltage can be used.

The invention relates to a method for producing an alkali metal alcoholate solution L.sub.1 in an electrolysis cell E which comprises at least one cathode chamber K.sub.K, at least one anode chamber K.sub.A, and at least one central chamber K.sub.M lying therebetween. The interior I.sub.KK of the cathode chamber K.sub.K is separated from the interior I.sub.KM of the central chamber K.sub.M by a separating wall W comprising at least one alkali-cation-conductive solid ceramic electrolyte (=AFK) F (e.g. NaSICON). F has the surface O.sub.F. A part O.sub.A/MK of the surface O.sub.F directly contacts the interior I.sub.KM, and a part O.sub.KK of the surface O.sub.F directly contacts the interior I.sub.KK. The surface O.sub.A/MK and/or the surface O.sub.KK comprises at least one part of a surface O.sub.F. O.sub.F is produced from a pre-treatment step in which F is produced from an AFK F comprising the surface O.sub.F. In the pre-treatment step, AFK is removed from F by sputtering the surface O.sub.F using noble gas cations N+, and the AFK F with the surface O.sub.F comprising the surface O.sub.F formed by the sputtering process is obtained. During the electrolysis process for producing the alkali metal alcoholates with F instead of F, an improved conductivity is provided, whereby for a constant current density, a lower voltage can be used.

A method for directly preparing a trivalent chromium compound by electrochemical oxidation of ferrochrome is provided. The method includes: putting ferrochrome as an anode, and placing the anode into an electrolyte solution containing a complexing agent together with a cathode, then turning on a power supply for electrolysis reaction so that chromium and iron in ferrochrome are directly converted into free Cr.sup.3+ and Fe.sup.3+ respectively, allowing one of Cr.sup.3+ and fe.sup.3+ to form a stable soluble metal complex together with the complexing agent, and allowing the other of Cr.sup.3+ and Fe.sup.3+ to form a metal hydroxide solid together with OH.sup. generated by electrolysis reaction, so as to obtain an electrolysis completion slurry. Compared with the prior art, the present application has no hexavalent chromium salt stage, thereby shortening the process flow and avoiding the generation of chromium-containing waste residue.

A method for directly preparing a trivalent chromium compound by electrochemical oxidation of ferrochrome is provided. The method includes: putting ferrochrome as an anode, and placing the anode into an electrolyte solution containing a complexing agent together with a cathode, then turning on a power supply for electrolysis reaction so that chromium and iron in ferrochrome are directly converted into free Cr.sup.3+ and Fe.sup.3+ respectively, allowing one of Cr.sup.3+ and fe.sup.3+ to form a stable soluble metal complex together with the complexing agent, and allowing the other of Cr.sup.3+ and Fe.sup.3+ to form a metal hydroxide solid together with OH.sup. generated by electrolysis reaction, so as to obtain an electrolysis completion slurry. Compared with the prior art, the present application has no hexavalent chromium salt stage, thereby shortening the process flow and avoiding the generation of chromium-containing waste residue.

Provided is a novel method for labeling a radionuclide such as .sup.211At with a high radiochemical yield under more convenient and stable conditions.

A production method of an aryl compound labeled with a radionuclide includes a step of applying a voltage to a solution A containing a radionuclide and electrolytically oxidizing the radionuclide; and a step of mixing the solution A and a solution B containing a compound S having a halogenated aryl group to substitute a halogen atom on the aryl group of the compound S with the radionuclide.