Chitosan-Gelatin Hydrogels for heavy metal adsorption and chitosan-gelatin hydrogels manufactured by the same method

摘要

The present invention uses a crosslinking agent to crosslink chitosan and gelatin to efficiently remove heavy metals harmful to the human body, such as lead, cadmium, mercury, and chromium, in contaminated wastewater, and a method for manufacturing a chitosan-gelatin hydrogel for adsorption of heavy metals. It relates to a hydrogel prepared according to the The present invention is a first step of preparing a chitosan solution by adding chitosan having a weight average molecular weight of 100,000 to 200,000 to an acidic aqueous solution, and dispersing it at room temperature for 1 to 24 hours; a second step of preparing a gelatin solution by adding gelatin having a weight average molecular weight of 100,000 to 200,000 to water and dispersing it at a temperature of 20 to 50° C. for 1 to 5 hours; A third step of mixing the chitosan solution and the gelatin solution; a fourth step of crosslinking the chitosan and gelatin by adding a crosslinking agent to the mixed solution; After the fourth step, a fifth step of preparing a hydrogel by separating and pulverizing the cross-linked chitosan-gelatin complex from the mixed solution; and a sixth step of washing so that the pH of the hydrogel is 6 to 7.5, and freeze-drying for 24 to 72 hours to solidify;