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Marine waste upcycling—recovery of nylon monomers from fishing net waste using seashell waste-derived catalysts in a CO2-mediated thermocatalytic process.
- Source :
- Journal of Materials Chemistry A; 10/7/2022, Vol. 10 Issue 37, p20024-20034, 11p
- Publication Year :
- 2022
-
Abstract
- A lot of fishing nets have been abandoned, lost, or discarded at sea. Herein, we aimed at applying seashell waste-derived catalytic materials to a thermocatalytic process to recover a valuable commodity chemical (e.g., caprolactam) from fishing net waste (FNW) made of polyamide 6. For catalyst synthesis, seashell waste was carbonized in N<subscript>2</subscript> and CO<subscript>2</subscript> environments (denoted as SSWC-N<subscript>2</subscript> and SSWC-CO<subscript>2</subscript>, respectively); here, the basicity of SSWC-CO<subscript>2</subscript> was two-fold more than that of SSWC-N<subscript>2</subscript>. The thermocatalytic conversion of FNW was also conducted under N<subscript>2</subscript> and CO<subscript>2</subscript> atmospheres. Using SSWC-CO<subscript>2</subscript> in the thermocatalytic conversion conducted under a CO<subscript>2</subscript> atmosphere maximized the caprolactam recovery (80 wt% of FNW feedstock, the highest yield reported to date) possibly because the base-catalyzed decomposition of polyamide 6 was enhanced by more reactive cleavage of the amide linkage in CO<subscript>2</subscript>. SSWC-CO<subscript>2</subscript> was reused for at least three cycles. In conclusion, SSWC-CO<subscript>2</subscript> is a promising alternative catalyst to recover caprolactam from FNW. The findings from this study offer insights into developing a new thermocatalytic upcycling process for marine waste such as FNW and seashell waste. This aids in reducing microplastic pollution and increasing economic potential for marine waste valorization. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 10
- Issue :
- 37
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 159346443
- Full Text :
- https://doi.org/10.1039/d2ta02060b