Interdependent factors influencing the carbon yield, structure, and CO$$_{2}$$ adsorption capacity of lignocellulose-derived carbon fibers using multiple linear regression

Abstract

Cellulose has experienced a renaissance as a precursor for carbon fibers (CFs). However, cellulose possesses intrinsic challenges as precursor substrate such as typically low carbon yield. This study examines the interplay of strategies to increase the carbonization yield of (ligno-) cellulosic fibers manufactured via a coagulation process. Using Design of Experiments, this article assesses the individual and combined effects of diammonium hydrogen phosphate (DAP), lignin, and CO$$_{2}$$ 2 activation on the carbonization yield and properties of cellulose-based carbon fibers. Synergistic effects are identified using the response surface methodology. This paper evidences that DAP and lignin could affect cellulose pyrolysis positively in terms of carbonization yield. Nevertheless, DAP and lignin do not have an additive effect on increasing the yield. In fact, combined DAP and lignin can affect negatively the carbonization yield within a certain composition range. Further, the thermogravimetric CO$$_{2}$$ 2 adsorption of the respective CFs was measured, showing relatively high values (ca. 2 mmol/g) at unsaturated pressure conditions. The CFs were microporous materials with potential applications in gas separation membranes and CO$$_{2}$$ 2 storage systems. Graphical abstract

AI-guided biorefinery optimization for the production of lignin-carbohydrate complexes with tailored properties

“…A natural feedstock to consider is plant biomass 1 due to its inherent abundance and renewability. Many promising avenues of lignocellulosic biomass valorization have been identified, for example, platform chemicals 2,3 , biofuels [4][5][6] , cellulose nanofibers [7][8][9] , nanocomposite films 10,11 , carbon fibres [12][13][14] , carbon foams 15 , thermoplastics 16 , and thermosets. 17 Lignocellulosic biomass consists of lignin (in the 5-30 % range), hemicellulose (20-40 %), and cellulose (40-60 %) 18 and sees widespread use as a feedstock in integrated biorefineries.…”