Design&Applications Of Bio-based CO₂Reversible Absorption Materials

Nowadays，global warming that caused by excessively CO₂emissions as a resultof intemperate depending on fossil resources has been one of the most concerns. Andalso biomass has become one of the resources which could be used for newlybiology、chemicals and materials because of its richness, renewability, biodegradableand biological compatibility. There are three hydroxyls in the glucose units per onecellulose molecule. A series of reactions could happen because of the hydroxyl, suchas the etherification, esterification and nucleophilic substitution reaction of thehydroxyl; thereby people can study and control the synthesis of the functionalcellulose derivatives from the molecular lever in order to obtain special and functionalfine chemical products. Research on applications of cellulose in the field of the newtechnology, new materials and new energy has become a competitive subject at homeand abroad.Because bio-based small molecules and polymers （cellulose） has thecharacteristic of polyhydroxy, easily modified, and also the organic bases andhydroxyl groups could react with each other, with these as our starting point, wedesign and construct a new bio-based CO₂reversible adsorption system and exploreits application. A new research approach came out for higher value application ofcoupling biomass with CO₂. The main content was as follows:（1） With glycerol and glucose as model compounds, the behavior of CO₂reversible adsorption in the presence of1,8-Diazabicyclo [5.4.0] undec-7-ene （DBU）was investigated.（2） The applications in the process of biodiesel translated from oil withDBU-glycerol and tetramethylguanidine-glycerol system were studied. And all kindsof reaction conditions such as the molar ratio of raw material, catalyst type, reactiontime and CO₂pressure were discussed. The results turned out that the molar ratio ofDBU （1,8-Diazabicyclo[5.4.0]undec-7-ene） and methanol was1:18, reactiontemperature was70C, reaction time was20min, in these conditions, the efficiencywas95.2%which was the highest. Besides, pure product of fatty acid methyl estersand glycerol could be easily obtained by decanting because of the role of reversibleionic liquid.（3） The guanidine functionalized cellulose was synthesized with the cellulose as the raw and the ionic liquid as the solvent.¹H NMR、FT-IR、TGA and ElementalAnalysis were employed to investigate the middle and the final polymers. Theapplications such as the in situ absorption and conversion of CO₂and the load andcatalytic of nanoparticles were preliminary studied.