Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

FeCo core-shell nanospheres and a method for producing the FeCo core-shell nanospheres are disclosed. Further disclosed is a method of reducing an organic contaminant in a solution by mixing the FeCo core-shell nanospheres with the solution. The FeCo core-shell nanosphere includes a shell made of a material having a formula Co.sub.xFe.sub.yO.sub.(x+1.5y) and a hollow core. The FeCo core-shell nanospheres are produced by mixing cobalt nitrate and iron nitrate in a solvent mixture to form a first mixture and mixing urea with the first mixture to form a second mixture. The solvent mixture is removed from the second mixture to form a powder. The powder is ground to form the FeCo core-shell nanospheres.

FeCo core-shell nanospheres and a method for producing the FeCo core-shell nanospheres are disclosed. Further disclosed is a method of reducing an organic contaminant in a solution by mixing the FeCo core-shell nanospheres with the solution. The FeCo core-shell nanosphere includes a shell made of a material having a formula Co.sub.xFe.sub.yO.sub.(x+1.5y) and a hollow core. The FeCo core-shell nanospheres are produced by mixing cobalt nitrate and iron nitrate in a solvent mixture to form a first mixture and mixing urea with the first mixture to form a second mixture. The solvent mixture is removed from the second mixture to form a powder. The powder is ground to form the FeCo core-shell nanospheres.

The present disclosure relates to oxygen-selective anodes and methods for the use thereof.

The present disclosure relates to oxygen-selective anodes and methods for the use thereof.

In one aspect, the disclosure relates to a solar absorber comprising light-absorbing multiscale fractal textured surfaces. The disclosure also relates to methods of making the same.

In one aspect, the disclosure relates to a solar absorber comprising light-absorbing multiscale fractal textured surfaces. The disclosure also relates to methods of making the same.

A Co.sub.3O.sub.4/CuO/MgO nanocomposite material includes cubic Co.sub.3O.sub.4 crystalline phases; monoclinic CuO crystalline phases; and cubic MgO crystalline phases. The average crystallite size of the Co.sub.3O.sub.4/CuO/MgO nanocomposite material is in a range from 50 to 70 nm, and the Co.sub.3O.sub.4/CuO/MgO nanocomposite material has a granular morphology comprising granular particles with an average diameter in a range from 75 to 95 nm.

A method of removing hydrogen sulfide from a subterranean geological formation includes injecting a drilling fluid suspension in the subterranean geological formation. The drilling fluid suspension has a pH of 10 or more and includes a layered triple hydroxide material, including manganese, cobalt, and iron, in an amount of 0.01 to 0.5 precent by weight of the drilling fluid suspension. The method further includes circulating the drilling fluid suspension in the subterranean geological formation and forming a water-based mud and scavenging the hydrogen sulfide from the subterranean geological formation by reacting the hydrogen sulfide with the layered triple hydroxide material in the water-based mud.