Polietilenimin ile Modifiye Edilmiş Silika Kserojellerin Kullanımı ile CO2 Tutumu

Abstract

CO2 capture technologies using solid adsorbents are promising approach to reduce environmental pollution resulting from CO2 emission. In this study, silica xerogel derived from cheap precursor was used as a CO2 adsorbent after polyethyleneimine (PEI) functionalization. Fourier transform infrared (FTIR) analyses indicated that PEI functionalized silica xerogels were successfully prepared. N2 adsorption-desorption isotherms revealed that PEI loading decreased specific surface area and pore volume of the neat silica xerogel in contrast to pore size. An increase in particle size of the neat silica xerogel was observed in the case of PEI loading. Positively surface charged silica xerogels were obtained with PEI loading of the neat silica xerogel which had negatively charged surface. CO2 adsorption measurements showed that CO2 adsorption capacity of the neat silica xerogel (0.98 mmol g-1) significantly increased with increasing PEI loading (30 – 70 wt%). At optimum PEI loading (50 wt%), CO2 adsorption capacity of silica xerogel was determined as 1.94 mmol g-1. After 5 adsorption-desorption cycles, PEI functionalized silica xerogels still exhibited high CO2 adsorption capacity. The hopeful results showed that PEI functionalized silica xerogels can be used as an adsorbent with a good CO2 adsorption performance and stability.