tThe low CO2absorption in water is a major issue for the water-based CO2capture technology. The cur-rent study focuses on augmentation effect of silica nanoparticles in a water-based nanofluid system onCO2absorption experiments, carried out in a wetted wall column (WWC). Central composite design(CCD) and response surface methodology (RSM) have been applied to predict the individual and possi-ble interaction influences of the most important operating variables, including absorption temperature,(25–45◦C), nanofluid flow rate, (100–300 mL/min), and concentration (0–1 %w) under atmospheric pres-sure. The propriety of the RSM model has been confirmed through R-squared and adjusted determinationcoefficients (R2= 0.9757, and Adj-R2= 0.9605).The combination of temperature and liquid flow rate, as well as liquid flow rate and concentration,has been proved to be highly effective for CO2absorption in gas-liquid mass transfer experiments. Thefindings further have revealed that the impact of temperature at low flow rates is sensible on the gas-liquid mass transfer. Moreover, low absorption temperatures and high flow rates of silica nanofluidcan dramatically enhance the liquid-side mass transfer coefficient. It was found that under the optimaloperation condition, the enhancement ratio of the predicted klin the presence of silica nanoparticles canbe over 1.37.
