Marine waste upcycling—recovery of nylon monomers from fishing net waste using seashell waste-derived catalysts in a CO2-mediated thermocatalytic process,Journal of Materials Chemistry A

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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
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-08-02 , DOI: 10.1039/d2ta02060b
Soosan Kim ₁ , Yong Tae Kim ₂ , Lee Seul Oh ₂ , Hyung Ju Kim ₂ , Jechan Lee ₃

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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 N₂ and CO₂ environments (denoted as SSWC-N₂ and SSWC-CO₂, respectively); here, the basicity of SSWC-CO₂ was two-fold more than that of SSWC-N₂. The thermocatalytic conversion of FNW was also conducted under N₂ and CO₂ atmospheres. Using SSWC-CO₂ in the thermocatalytic conversion conducted under a CO₂ 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 CO₂. SSWC-CO₂ was reused for at least three cycles. In conclusion, SSWC-CO₂ 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.

中文翻译：

海洋废物升级循环——在二氧化碳介导的热催化过程中使用贝壳废物衍生催化剂从渔网废物中回收尼龙单体

许多渔网被遗弃、丢失或丢弃在海上。在这里，我们的目标是将贝壳废料衍生的催化材料应用于热催化过程，以从由聚酰胺 6 制成的渔网废料 (FNW)中回收有价值的商品化学品（例如己内酰胺）。对于催化剂合成，贝壳废料在 N ₂中碳化和CO ₂环境（分别表示为SSWC-N ₂和SSWC-CO ₂）；在这里，SSWC-CO _{2的碱度是SSWC-N}₂的两倍。FNW的热催化转化也在N ₂和CO ₂气氛下进行。使用 SSWC-CO ₂在 CO ₂气氛下进行的热催化转化中，己内酰胺回收率最大化（80 wt% 的 FNW 原料，迄今为止报道的最高产率）可能是因为聚酰胺 6 的碱催化分解通过在一氧化碳₂。SSWC-CO ₂至少重复使用三个循环。总之，SSWC-CO ₂是一种很有前途的替代催化剂，可用于从 FNW 中回收己内酰胺。这项研究的结果为开发一种新的热催化升级循环工艺用于海洋废物（如 FNW 和贝壳废物）提供了见解。这有助于减少微塑料污染并增加海洋废物增值的经济潜力。

更新日期：2022-08-02

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