Delignification loofah sponge, loofah sponge based hydrogel and preparation method of delignification loofah sponge based hydrogel

The invention discloses delignification loofah sponge, loofah sponge-based hydrogel and a preparation method of the delignification loofah sponge-based hydrogel, and the preparation method of the loofah sponge-based hydrogel comprises the following steps: (1) preparing a FeCl3 solution and a tannic acid solution, and mixing the FeCl3 solution and the tannic acid solution to obtain a solution I; (2) preparing an acrylamide solution, and adding ammonium persulfate and N, N '-methylene bisacrylamide to obtain a solution II; and (3) putting the delignified loofah sponge into a silica gel mold, uniformly mixing the solution I and the solution II, pouring the mixture into the silica gel mold to enter a frame of the delignified loofah sponge, and standing to form the loofah sponge-based hydrogel. The loofah sponge is subjected to delignification treatment before the hydrogel is prepared, so that enough hydroxyl groups are exposed on the surface of the loofah sponge to form hydrogen bonds with hydrogel chain segments