Improvement of amine-modification with piperazine for the adsorption of CO2

► Both selectivity and capacity of CO2 adsorption were considerably increased when PZ (piperazine) was added in MDEA (methyldiethylamine) that used to modify adsorbent surface. ► The adsorbent saturated with CO2 was regenerated at ambient temperature through nitrogen purge. ► PSA (pressure swing adsorption) experiments illustrated the potential application of the modified adsorbent.