Solar assisted reduced graphene oxide as adsorbent for carbon dioxide and its kinetic studies

Combustion of fossil fuels is one of the major sources of greenhouse gas (GHG) carbon dioxide (CO2). The increasing concentration of CO2 in the atmosphere is considered to be one of the main causes of global warming. The commonly used techniques for carbon dioxide capture are absorption, cryogenic separation, adsorption, membrane separation and micro algal bio fixation. In this manuscript, solar reduced graphene oxide (SRGO) has been synthesized by modified Hummer's method. Then the as-synthesized SRGO was carried out for kinetic adsorption studies of CO2. The effect of various parameters such as contact time, mass of adsorbent and concentration of CO2, adsorption thermodynamics and temperature effects was investigated. The equilibrium data were tested with Langmuir, Freundlich and it was found that the Fruendlich isotherm best fitted for the adsorption data. Adsorption capacity was found to be 1.893 × 10−3 mol/g. Pseudo second order kinetics describes the kinetics of CO2 on SRGO. The equilibrium point was attained at 60 min. •Reduced graphene oxide has been synthesized using solar radiation.•Solar assisted reduced graphene oxide used as CO2 adsorbent.•Kinetics studies of CO2 were performed using Langmuir isotherm, Pseudo II order kinetics.