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Carbon nanoflake hybrid for biohydrogen CO 2 capture: Breakthrough adsorption test
Author(s) -
Anuar Siti A.,
Wan Isahak Wan N. R.,
Masdar Mohd S.
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5169
Subject(s) - adsorption , x ray photoelectron spectroscopy , fourier transform infrared spectroscopy , microporous material , materials science , chemical engineering , bet theory , mesoporous material , scanning electron microscope , carbon fibers , specific surface area , oxide , nuclear chemistry , nanotechnology , chemistry , catalysis , organic chemistry , composite number , composite material , engineering , metallurgy
Summary Biohydrogen gas is a hot topic for H 2 fuel at present. However, removal of the unwanted CO 2 through adsorption is required before any system is supplied with high‐purity H 2 gas. Herein, we prepared a novel carbon nanoflake hybrid for efficient biohydrogen CO 2 capture by combining the advantages of carbon, metal oxide, and amine. Among the samples, SH800 showed a remarkable high CO 2 adsorption capacity of 29.8 wt.% (6.77 mmol/g) at 25°C and 1 atm, the highest ever reported at low pressure and temperature. The regeneration experiment also demonstrated robust reversibility over five cycles in the absence of heat treatment. Moreover, it displayed a highly accessible adsorption site with a Brunauer‐Emmett‐Teller (BET) surface area of 600 m 2 /g and an optimal 6.6‐nm average mesopore structure. Another hybrid named SH500 was also developed. This hybrid showed a comparable CO 2 uptake of 27.8 wt.%, being competitive to SH800 but with entirely different chemical properties. Both samples were analyzed by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET, Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy, (XPS) and were tested for CO 2 capture through a breakthrough experiment. A highly porous solid adsorbent was also produced via soft‐template synthesis. In summary, the correct amount of dynamic factors, such as high surface area, mesopore‐micropore morphology, activation temperature, metal hybridization, and N moieties, played a major role in the carbon engineering of CO 2 adsorbent.