Layer-by-layer self-assembly of sodium tripolyphosphate/chitosan composites on mesoporous alumina for CO2 adsorption

We report the synthesis of mesoporous alumina (MA)-supported sodium tripolyphosphate (STPP)/chitosan (Ch) composite (denoted as MA@STPP/Ch) by a layer-by-layer self-assembly method. The multilayered MA@STPP/Ch is nontoxic and shows excellent CO2 adsorption capacity (maximum: 278.96 mg g−1 at 50 °C) and reusability, better than that of MA (97.24 mg g−1 at 50 °C). The enhanced CO2 adsorption could be ascribed to the synergism between porous structure and functional groups of Ch.