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• W4295135940 endingPage "122089" @default.
• W4295135940 startingPage "122089" @default.
• W4295135940 abstract "• Rice husk-derived porous biochar was designed according to its natural structure. • Porous biochar with narrow ultra-micropores and interconnected channels was obtained. • Higher CO 2 capture capacity than that of KOH or self activated sample was achieved. • CO 2 tends to be absorbed in the nanocapsules and interconnected channel structure. Carbon capture is an effective solution to reduce the emitted CO 2 from the burning of fossil fuels. However, the intrinsic tradeoff between activator selection and narrow pores for CO 2 capture, as well as the difficult design of pores according to the biomass natural structure, greatly limits the CO 2 capture capacity. To overcome those issues, for the first time, porous biochar with precisely narrow pores (0.36 and 0.59 nm) and nanocapsules structure was assembled by coupling the merit of typical silicon-rich waste rice husk and low-corrosive potassium citrate for CO 2 adsorption application. The narrow ultramicropore was obtained and verified by CO 2 and N 2 molecular probes. Potassium citrate activated biochar exhibited an excellent gravimetric CO 2 capture capacity of 1.55 mmol/g, which was 1.35 and 2.04 times higher than potassium citrate self-assembled and KOH-activated samples, respectively. The as-synthesized potassium citrate activated biochar exhibited high CO 2 /N 2 selectivity of 37.80 (1 bar, 25°C) and regeneration efficiencies above 99% after 10 cycles. In combination with TG-FTIR, SEM and XRD, key CO 2 capture mechanisms were proposed: 1) CO 2 is encapsulated in the nanocapsules structure (∼1 μm) and enters the interior carbon matrix skeleton with narrow ultra-micropores (V ultra =0.213 cm 3 /g); 2) CO 2 tend to be absorbed in interconnected channel formed by tailoring the external SiO 2 nanoparticles and internal organic carbon. This strategy could provide a new insight to guide the pores design according to biomass natural structure for efficient CO 2 capture." @default.
• W4295135940 created "2022-09-11" @default.
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• W4295135940 date "2022-12-01" @default.
• W4295135940 modified "2023-10-18" @default.
• W4295135940 title "Green synthesis of porous biochar with interconnected pore architectures from typical silicon-rich rice husk for efficient CO2 capture" @default.
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• W4295135940 doi "https://doi.org/10.1016/j.seppur.2022.122089" @default.
• W4295135940 hasPublicationYear "2022" @default.
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