The invention relates to a composite hydrogel sphere
algaecide and a preparation method thereof, and is applicable to
algae removal of a small-size landscape
water body which takes the blue-
green algae as dominant species. The composite hydrogel sphere
algaecide comprises 1000-1500 parts by weight of
sodium alginate and 200-600 parts of
graphene oxide, and is prepared by firstly, adding
sodium alginate into deionized water, stirring with magnetic force until
sodium alginate is completely dissolved, thereby preparing a 2-3% (w / v) solution, and by subsequently adding
graphene oxide. The preparation method comprises the following steps: 1) adding a certain amount of
sodium alginate into deionized water, stirring with magnetic force until
sodium alginate is completely dissolved, thereby preparing a 2-3% (w / v) solution; 2) subsequently adding
graphene oxide and an allelochemical substance
gallic acid, and uniformly mixing by using an ultrasonic assistance oscillation method, thereby preparing a dispersing liquid; 3) dropping the dispersing liquid into a 5-10% CaC12 solution by using a
burette so as to cure to obtain
calcium gel spheres, curing for 1-2 hours, and taking out; 4) repeatedly washing with deionized water, and standing to remove residues on the surface; and 5)
drying in a vacuum oven.