Microwave-coordinated KOH directionally modulated N/O co-doped porous biochar from Enteromorpha and its structure–effect relationships in efficient CO2 capture

Luo，Juan2; Chen，Yi1; Huang，Huimin1; Ma，Rui1; Ma，Ning3; Yan，Feng4; Xu，Jiyun4; Zhang，Junshen1; Chen，Jiashan1; Sun，Shichang1

2023-10-01

10.1016/j.cej.2023.145279

Chemical Engineering Journal   Impact Factor & Quartile

1385-8947

To develop the CO adsorption capacity of Enteromorpha-based biochar, N/O co-doped porous biochar (NOBC) was directionally modulated by microwave-coordinated KOH, and the CO capture mechanism was explored by structure-effect relationship and density functional theory (DFT) calculations. NOBC with different porous structures and heteroatom contents were prepared by optimization of key parameters (microwave heating temperature, heating time, and KOH ratio) via Response Surface Methodology. The results showed that NOBC(700–20-3) had the maximum CO adsorption capacity of 6.09 mol/kg (273 K and 1 bar) and the CO/N selectivity of 78.88 (298 K and 1 bar). After 5 cycles, the CO adsorption capacity of NOBC(700–20-3) was still up to 5.98 mol/kg (273 K and 1 bar), showing good cycling performance. The structure-effect relationship analysis showed that the CO capture performance of NOBC was proportional to the specific surface area, micropore ratios, graphitization degree, and heteroatoms contents, and inversely proportional to the mean pore diameter. DFT indicated that the synergistic effect between N and O elements developed the CO adsorption ability by boosting the affinity and electron transfer between NOBC and CO. This work contributed to providing a theoretical basis and technical support for the targeted modulation of porous structures and improved surface properties of biochar for efficient CO adsorption.

CO2 capture Enteromorpha Microwave activation Porous biochar Structure–effect relationships

English

Others

Science and Technology Planning Project of Shenzhen Municipality[JSGG20210713091810035];

ENGINEERING

2-s2.0-85167403916

Scopus

1.College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen,518060,China
2.School of Environment,Harbin Institute of Technology,Harbin,150090,China
3.China Electronic System Engineering Co.,Ltd,Beijing,100040,China
4.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Luo，Juan,Chen，Yi,Huang，Huimin,等. Microwave-coordinated KOH directionally modulated N/O co-doped porous biochar from Enteromorpha and its structure–effect relationships in efficient CO2 capture[J]. Chemical Engineering Journal,2023,473.

Luo，Juan.,Chen，Yi.,Huang，Huimin.,Ma，Rui.,Ma，Ning.,...&Sun，Shichang.(2023).Microwave-coordinated KOH directionally modulated N/O co-doped porous biochar from Enteromorpha and its structure–effect relationships in efficient CO2 capture.Chemical Engineering Journal,473.

Luo，Juan,et al."Microwave-coordinated KOH directionally modulated N/O co-doped porous biochar from Enteromorpha and its structure–effect relationships in efficient CO2 capture".Chemical Engineering Journal 473(2023).