PEI-modified sodium alginate loaded clay mineral gel microspheres as well as preparation method and application thereof

The invention discloses PEI modified sodium alginate loaded clay mineral gel microspheres as well as a preparation method and application thereof, and belongs to the technical field of adsorption materials. The preparation method comprises the following steps: dispersing a clay mineral into water to form a suspension, sequentially adding sodium alginate and a pore-foaming agent into the suspension, uniformly stirring, dropwise adding into a calcium ion solution, carrying out a cross-linking reaction to obtain gel microspheres, coating the surfaces of the gel microspheres with PEI, and carrying out cross-linking to obtain the hydrogel. The PEI modified sodium alginate loaded clay mineral gel microsphere with a porous structure, a large specific surface area and good stability is obtained. The surface of the gel microsphere material is modified with a large number of amino groups, holes contain rich hydroxyl groups and carboxyl groups, meanwhile, a large number of clay minerals are loaded, the three can achieve