| CPC C08J 3/075 (2013.01) [C08J 3/005 (2013.01); C08J 3/24 (2013.01); C08J 9/0095 (2013.01); C08J 2305/08 (2013.01); C08J 2333/26 (2013.01)] | 13 Claims |

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1. A chitosan-polyacrylamide composite porous hydrogel, which is prepared by in situ polymerization of a chitosan sol, an acrylamide, a crosslinking agent and a surfactant into a mixed solution comprising liquid droplets, followed by steps of curing, washing, and freeze-drying;
wherein the chitosan-polyacrylamide composite porous hydrogel has a porosity of 60-70% and an average pore size of 40-60 μm.
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