| Abstract:Hydrogel is the high water absorption, biocompatible and flexible material. Lignin has a wide range of sources, abundant reserves, low price, which is a green renewable raw material for preparing hydrogels. This article introduces the source, classification and structural properties of lignin and the main methods of preparing the lignin-based hydrogel. The methods preparing the adsorbed lignin-based hydrogel and the responsive lignin-based hydrogel are described in details. The potential applications of lignin-based hydrogels are proposed, as well. |