The application provides a multi-layer core-shell structure composite slow-release
oxygen particle and a preparation method thereof, which comprises a three-layer structure of a weight-increasing core, an
oxygen-releasing intermediate layer and a functional
surface layer. The weight-increasing core is a high-density inorganic
microsphere selected from one or more of
alumina microspheres and silica microspheres, and the composition of the weight-increasing core is a binder and
calcium peroxide, and the weight-increasing core has a long-acting slow-release
oxygen function, wherein the binder is selected from one of
sodium alginate,
xanthan gum and
guar gum; the composition of the outer shell layer is a binder, a porous adsorption material and a catalytic functional material, wherein the binder is physically crosslinked PVA, the adsorption functional material is selected from one or more of
biochar powder,
zeolite powder, diatomite and attapulgite, and the catalytic functional material is selected from one or more of iron-carbon
powder, nano-
iron powder and
pyrite powder.