Kinetics and selectivity insights into carbon dioxide capture utilizing carboxymethyl cellulose-polypyrrole nanocomposites: Screening of silane functionalization.

Cellulose is a highly versatile and abundant biopolymer that holds significant promise for enhancing capture technologies due to its inherent properties. However, to maximize its effectiveness in carbon dioxide (CO2) adsorption, it is essential to enhance its properties through chemical or physical modifications. By developing cellulose-based materials with tailored functionalities, we can create sustainable sorbents that not only contribute to reducing greenhouse gas emissions but also leverage low-cost and environmentally friendly resources, making them suitable for large-scale applications in carbon capture technologies. This study demonstrates the synthesis of carboxymethyl cellulose-polypyrrole (CMC-PP) nanocomposite and its coating with (3-aminopropyl)triethoxysilane (APTS) or (3-mercaptopropyl)trimethoxysilane (MPTS) to derive CMC-PP-NH2 and CMC-PP-SH nanocomposites, respectively. The designed composites' physicochemical properties were studied using various analytical techniques. The CO2 and N2 capture capabilities of CMC-PP, CMC-PP-NH2, and CMC-PP-SH nanocomposites were investigated. Among them, the CMC-PP-SH nanocomposite has exhibited the highest CO2 adsorption capacity of 49.6 cm3g-1. Adsorption isotherms fitting using the dual-site Langmuir model and calculation of standard enthalpy changes (Qst) reveal that the thiol groups in CMC-PP-SH provide the most favourable interactions for CO2 capture. These findings demonstrate the potential utilization of silane coatings to develop advanced materials for effective gas adsorption and separation technologies.