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Recently, there has been interest in designing recyclable and economical material for actual environmental remediation. In the present research work, amine-functionalised biosilica/alginate (NH 2 -SiO 2 /ALG) composite was evaluated for efficient capture of carbon dioxide (CO 2 ). The morphological and textural properties of NH 2 -SiO 2 /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 CO 2  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 CO 2  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 NH 2 -SiO 2 /ALG and CO 2  molecules. Regeneration tests showed that the synthesised NH 2 -SiO 2 /ALG can be effectively recovered and used in multiple runs.

international journal of environmental analytical chemistry

Modelling and optimisation by response surface technique for adsorption of carbon dioxide by aminated biosilica/alginate composite: Experiments, characterisation and regeneration studies