Abstract
Incorporation of rice-husk-ash (RHA), an agricultural waste, in situ during the synthesis of MIL-101(Cr) resulted in a significant improvement in the CO2 adsorption properties over the synthesized RHA-MIL-101(Cr). The newly synthesized RHA-MIL-101(Cr) composite exhibited an enhancement of 14–27% in CO2 adsorption capacity as compared to MIL-101(Cr) at 25 °C and 1 bar. The content of RHA incorporated in RHA-MIL-101(Cr) fine tuned the CO2 capture performance to achieve high working capacity (0.54 mmol g−1), high purity (78%), superior CO2/N2 selectivity (18) and low isosteric heat of adsorption (20–30 kJ mol−1). The observed superior CO2 adsorption performance of RHA-MIL-101(Cr) is attributed to the fine tuning of textural characteristics—enhancement of 12–27% in BET surface area, 12–33% in total pore volume and 18–30% in micropore volume—upon incorporation of RHA in MIL-101(Cr).
Highlights
Incorporation of rice-husk-ash (RHA), an agricultural waste, in situ during the synthesis of MIL101(Cr) resulted in a significant improvement in the CO2 adsorption properties over the synthesized rice husk ash (RHA)-MIL-101(Cr)
Our finding suggested that the studied RHAMIL-101(Cr) represents a class of efficient C O2 adsorption material
This work demonstrates high CO2 adsorption performance achieved by the incorporation of rice husk ash (RHA), a waste material, in situ during the synthesis of MIL-101(Cr) under hydrothermal condition
Summary
Incorporation of rice-husk-ash (RHA), an agricultural waste, in situ during the synthesis of MIL101(Cr) resulted in a significant improvement in the CO2 adsorption properties over the synthesized RHA-MIL-101(Cr). Chen et al reported PEI-incorporated MIL-101(Cr) adsorbents exhibited ultra-high C O2 adsorption capacity (4.2 mmol g−1) at 0.15 bar and superior C O2/N2 selectivity (770) in the flue gas (0.15 bar C O2 and 0.75 bar N 2) at 25 oC22.
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