Cellulose-Based Hybrid Composites Enabled by Metal Organic Frameworks for CO2 Capture: The Effect of Cellulosic Substrate

Abstract

A comparative study of two cellulosic materials i.e., cotton fabrics and nanobacterial cellulose (NBC), is reported as substrates for metal organic frameworks (MOF-199), to prepare micro and nanocompistes of cellulose@MOF-199 for CO 2 capture. The CO 2 uptake performance was investigated using gravimetric adsorption and desorption kinetics. NBC was an efficient substrate with full coverage and uniform distribution of MOF crystals observed in NBC@MOF-199 nanocomposite. The surface area for NBC@MOF-199 and Cotton@MOF-199 were 553.4 m 2 .g -1 and 168.9 m 2 .g -1 , respectively. NBC@MOF-199 showed a high adsorption capacity (2.9 mmol g 1 ) at ambient temperature and pressure, followed by Cotton@MOF-199 (1.2 mmol g -1 ). The kinetic studies revealed that the adsorption process is controlled by film diffusion at lower temperatures, and by sorption to active sites at higher temperatures. The estimated thermodynamic parameters represent a spontaneous adsorption with low activation energies of adsorption/desorption, promising a fast adsorption and facilitated regeneration adsorbent system with minimum energy costs.