Back to Search Start Over

Marine waste upcycling—recovery of nylon monomers from fishing net waste using seashell waste-derived catalysts in a CO2-mediated thermocatalytic process.

Authors :
Kim, Soosan
Kim, Yong Tae
Oh, Lee Seul
Kim, Hyung Ju
Lee, Jechan
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