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<p>In this study, porous activated carbon (AC) was prepared from biowaste cherry flowers (CF) using the chemical activating agents potassium hydroxide (KOH), sodium hydroxide (NaOH), and zinc chloride (ZnCl<sub>2</sub>) to capture CO<sub>2</sub> under ambient conditions. Among them, the CF-AC: KOH (1:2) sample showed the highest surface area of 1311 m<sup>2</sup>/g, pore volume of 0.74 cm<sup>3</sup>/g with high CO<sub>2</sub> adsorption uptake of 4.0&#xa0;mmol/g and CO<sub>2</sub>/N<sub>2</sub> selectivity of 28 at 298&#xa0;K. To further enhance CO<sub>2</sub> capture performance, nitrogen (N)-containing functional groups were introduced by mixing different weight percentages of melamine (M) or adenine (A). Melamine-doped CF-AC/K/M-1-2-1 demonstrated the highest CO<sub>2</sub> adsorption capacity of 4.9&#xa0;mmol/g or CO<sub>2</sub>/N<sub>2</sub> selectivity of 38 at 298&#xa0;K. Furthermore, the adsorbent material showed consistent CO<sub>2</sub> adsorption performance over ten consecutive CO<sub>2</sub> adsorption–desorption cycles by a temperature swing process. This finding highlights that a combination of both chemical activation and N-doping provides a sustainable strategy for the development of high-performance adsorbents derived from bio-waste for the CO<sub>2</sub> capture application. The synthesized ACs were characterized using the Brunauer–Emmett–Teller (BET) method for surface area, pore volume, and pore distribution; scanning electron microscopy (SEM) for particle morphology; and X-ray fluorescence for chemical composition analysis (XRF) of raw cherry flowers. The surface element atomic concentrations and binding energies were analyzed using X-ray photoelectron spectroscopy (XPS).</p>

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Remarkable Selective CO2 Adsorption by N-Rich Porous Activated Carbon Derived from Biowaste Cherry Flowers

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Sanjit Gaikwad,
  • Chungjung Choi,
  • Sangil Han

摘要

In this study, porous activated carbon (AC) was prepared from biowaste cherry flowers (CF) using the chemical activating agents potassium hydroxide (KOH), sodium hydroxide (NaOH), and zinc chloride (ZnCl2) to capture CO2 under ambient conditions. Among them, the CF-AC: KOH (1:2) sample showed the highest surface area of 1311 m2/g, pore volume of 0.74 cm3/g with high CO2 adsorption uptake of 4.0 mmol/g and CO2/N2 selectivity of 28 at 298 K. To further enhance CO2 capture performance, nitrogen (N)-containing functional groups were introduced by mixing different weight percentages of melamine (M) or adenine (A). Melamine-doped CF-AC/K/M-1-2-1 demonstrated the highest CO2 adsorption capacity of 4.9 mmol/g or CO2/N2 selectivity of 38 at 298 K. Furthermore, the adsorbent material showed consistent CO2 adsorption performance over ten consecutive CO2 adsorption–desorption cycles by a temperature swing process. This finding highlights that a combination of both chemical activation and N-doping provides a sustainable strategy for the development of high-performance adsorbents derived from bio-waste for the CO2 capture application. The synthesized ACs were characterized using the Brunauer–Emmett–Teller (BET) method for surface area, pore volume, and pore distribution; scanning electron microscopy (SEM) for particle morphology; and X-ray fluorescence for chemical composition analysis (XRF) of raw cherry flowers. The surface element atomic concentrations and binding energies were analyzed using X-ray photoelectron spectroscopy (XPS).