Journal
APPLIED SURFACE SCIENCE
Volume 592, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153266
Keywords
Mesoporous structures; Cyano; Sulfur; Lignin; Functionalized aromatics
Categories
Funding
- National Natural Science Foundation of China [21966023, 21665018, 51568049]
- Natural Science Foundation of Jiangxi Province, China [20171ACB21035]
- Jiangxi Province Graduate Student Innovation Special Fund [YC2020-S513]
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In this study, mesoporous cyano and sulfur co-modified carbon nitride (MCSCN) was successfully synthesized for the first time. The mesoporous structure reduced the mass transfer resistance and the modified cyano groups and sulfur atoms improved the photocatalytic valorization of waste lignin. WCOS lignin could be efficiently transformed to functionalized aromatics with MCSCN, achieving a much higher yield compared to traditional g-C3N4 photocatalyst.
Herein, mesoporous cyano and sulfur co-modified carbon nitride (MCSCN) is one-step constructed for the first time by a simple strategy using urea and trithiocyanuric acid as precursors. Trithiocyanuric acid can act as pore-fabricating units to form mesopores, meanwhile introduce cyano groups and sulfur atoms into carbon nitride. The constructed mesoporous structures effectively reduce the mass transfer resistance of macromolecular lignin in the photocatalytic reaction process. The synergistic effect of the modified cyano groups and sulfur atoms significantly improves the photocatalytic valorization effect of waste lignin to functionalized aromatics. As a representative of waste lignin, waste Camellia oleifera shell (WCOS) lignin can be efficently photocatalytic transformed to monophenolic compounds by MCSCN, and each gram of WCOS lignin can harvest 116.2 mg of functionalized aromatics, which is about 7 times higher than that by traditional g-C3N4 photocatalyst (16.7 mg/g).
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