Design of amine-functionalized resin via a facial method with efficient CO2 capture from air

In this study, using A400 Purolite as a solid resin base, solid adsorbents were prepared for the direct adsorption of carbon dioxide gas from the ambient air. The resin was functionalized with different percentages of amine (TEPA). Then, the adsorption capacity was modified for better performance in the presence of STAB as a sur-factant. Prepared samples were evaluated by CO2 adsorption and the experiments were done at identical con-ditions (22 degrees C, CO2 concentration 400 mg/L, and airflow of 2 L/min). The highest CO2 capture was related to sample with 40 % amines, whose adsorption capacity was 58 mg/g after 24 h. Then different amounts of the surfactants were added to these samples. Modified adsorbents in 10 % surfactants and 40 % amines (T40/S10 sample) showed the best performance by 84 mg/g CO2 adsorption in 24 h. The adsorption capacity of adsorbents increased after being functionalized with TEPA and the addition of STAB to the adsorbent surface, and led to increasing the adsorption capacity by 44 % (84 mg/g in 24 h). Also, the experimental results showed that the best performance of the adsorbent occurs at a loading of 0.5 gr and a gas flow of 0.3 L/min. Eventually, the influence of different operation parameters like adsorbent loading, airflow, and desorption temperature on the adsorbent performance in three cycles was investigated. Also, the reusability and stability of T40/S10 as the optimum sample was examined.