The aim of the present study is to investigate the possibility of increasing the carboxylate concentration of caborxycellulose nanofibers (CNF). The oxidation procedures used in this study were nitric acid, sodium periodate, and sodium chlorite. Nitric acid oxidation was conducted on raw wood biomass in order to produce 6-carboxycellulose (6CC) nanofibers, and then further oxidized to produce 2,3,6- tricarboxycellulose (TCC) nanofibers with higher carboxylate content. Furthermore, we look to analyze the effects of increased carboxylate content on the adsorptivity capabilities of the oxidized celluloses when introduced into solutions containing heavy metal ions (this study will utilize Pb2+ ions). The sequential oxidation reactions conducted in this study produced 6CC nanofibers with a carboxylate concentration of 1.1 mmol/g and TCC nanofibers with 1.4 mmol/g. After Pb2+ remediation experiments, a gelation effect was seen to occur in vials containing the 6CC samples, while in the vials containing the TCC samples, white flocculants can be seen to collect at the bottom of the vials. ICP-MS data was collected from both sets of remediation experiments; 6CC nanofibers has an adsorption efficiency between 63-93%, while TCC nanofibers has an adsorption efficiency between 78-99%.

Increased adsorption capacity for heavy metal ions via sequential oxidation of carboxycellulose nanofibers from raw wood

2019 Fall National Meeting

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