Micro crystalline cellulose (MCC) based amidoxime modified (MCC-AO) materials were prepared for the first time via co-condensation followed by solvent evaporation-induced self-assembly (EISA) strategy in the presence of Pluronic P123 triblock copolymer. These materials were synthesized by two-step process involving: (1) synthesis of micro crystalline cellulose with cyanopropyl groups (MCC-CP) by co-condensation of (3-cyanopropyl)triethoxysilane and MCC under acidic conditions followed by EISA (2) conversion of cyanopropyl groups into amidoxime upon treatment with hydroxylamine hydrochloride (NH2OH.HCl) under optimum conversion conditions. Series of MCC-CP and MCC-AO were explored for adsorption affinity towards CO2 at ambient (25 oC) and elevated (120 oC) temperatures. The resulting MCC-CP and MCC-AO showed low CO2 uptake at ambient conditions. MCC-CP samples studied at elevated temperature show moderately high CO2 uptake in the range of 2.15-2.41 mmol/g. However series of MCC-AO samples exhibit exceptionally high CO2 uptake in the range of 2.84-3.85 mmol/g at 120 oC in comparison to the MCC-CP. This study further shows that the high CO2 sorption capacity of MCC-AO exceeds significantly in comparison to the value obtained for the previously reported CO2 sorbents. High surface area of the series of MCC-AO samples combined with their biocompatibility, biodegradability, non-toxicity, low cost, cycle stability, and good thermal and mechanical stability makes this material attractive sorbent for high temperature CO2 sorption.

Micro crystalline cellulose based amidoxime functionalized mesoporous silica for high temperature carbon dioxide sorption

251st National Meeting (2016)

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