The pineapple waste-derived porous carbons with enhanced CO 2 adsorption performance were successfully prepared by a facile hydrothermal carbonation and followed thermal activation using facile alkali metal oxalates instead of KOH or K 2 CO 3 for chemical activation. Compared with macroporous-mesoporous carbons activated by Li 2 C 2 O 4 and Na 2 C 2 O 4 , the microporous carbon activated by K 2 C 2 O 4 at 700 °C with a relatively high specific surface area of 1076.3 m 2 g −1 and big pore volume of 0.92 cm 3 g -1 for narrow micropores (<1 nm)for narrow micropores (<1 nm) shows the highest adsorption capacities of 5.32 mmol g -1 at 0 °C, and 4.25 mmol g -1 at 25 °C under 1 bar, respectively. Furthermore, all the samples show high selectivities from 18.24 to 38.42 for CO 2 /N 2 separation, stable cyclic capability with adsorption loss of 12.6–17.8% after twelve cycles at 25 °C and reasonable isosteric heat of CO 2 adsorption. Especially, the microporous carbon activated by facile K 2 C 2 O 4 at 700 °C shows speedy adsorption dynamics and excellent dynamic adsorption performance for simulated flue gas based on its breakthrough curve. In combination with the low-cost carbon source, the above advantages make the pineapple waste-derived porous carbons exceptionally potential sorbent to capture and separate CO 2 under real conditions.
ASJC Scopus subject areas
- Chemical Engineering(all)