The oxidation of viscose fiber optimized by response surface methodology and its further amination with PEI for CO2 adsorption
Viscose fiber was oxidized with sodium periodate to prepare a reactive dialdehyde viscose fiber (DAVF) containing abundant aldehyde groups. A solid amine adsorbent (DAVF PEI) with high amino density for CO2 capture was then prepared by modifying DAVF with polyethylenimine (PEI) Response surface methodology (RSM) based on a three level, three factorial design was used to optimize the synthesis conditions of DAVF, in which multiple linear regression equations of aldehyde content and fiber mass loss degree were constructed. The well designed DAVF was then employed as a support to graft with PEI via Schiff base reaction to prepare a solid amine fiber (DAVF PEI) for CO2 adsorption. The experimental results verified that DAVF PEI possessed good thermo stability and high CO2 adsorption capacity (4.11 mmol/g) DAVF PEI also showed promising regeneration performance, which could maintain almost the same adsorption capacity for CO2 after ten adsorption and desorption recycles.
Cellulose