Modelling and optimisation by response surface technique for adsorption of carbon dioxide by aminated biosilica/alginate composite: Experiments, characterisation and regeneration studies
Hassan Rasoulzadeh, Saeed Motesaddi Zarandi, Mohamadreza Massoudinejad, Mostafa M. Amini
Abstract
Recently, there has been interest in designing recyclable and economical material for actual environmental remediation. In the present research work, amine-functionalised biosilica/alginate (NH2-SiO2/ALG) composite was evaluated for efficient capture of carbon dioxide (CO2). The morphological and textural properties of NH2-SiO2/ALG composite were comprehensively characterised by BET, SEM, XRD, TGA, and FTIR techniques. The impact of influential factors on the adsorption efficiency procedure was explored in a fixed-bed reactor and the corresponding breakthrough curves were plotted. The optimum value for CO2 removal efficiency (RE)% was predicted as 93.08% at 40°C temperature, 40 mL/min gas flow rate, and 5% moisture content. Under these conditions, the actual CO2 RE% was achieved 92.4%. The exothermic isosteric heat of adsorption (IHA) was found as 25.3–34.8 kJ/mol representing physical interactions between NH2-SiO2/ALG and CO2 molecules. Regeneration tests showed that the synthesised NH2-SiO2/ALG can be effectively recovered and used in multiple runs.