期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 49, 页码 58522-58531出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c16661
关键词
CaCO3; lignin; biocatalysis; photocatalysis; artificial photosynthesis
资金
- National Research Foundation (NRF) via the Creative Research Initiative Center, Republic of Korea [NRF-2015R1A3A2066191]
This study reported the successful encapsulation of photosensitizer and redox enzyme using lignin-induced stable vaterite as a support matrix for integrated artificial photosynthesis under visible light. The lignin-vaterite structure showed the ability to protect active components for extended periods while facilitating the photosynthesis reaction.
The vaterite phase of CaCO3 exhibits unique characteristics, such as high porosity, surface area, dispersivity, and low specific gravity, but it is the most unstable polymorph. Here, we report lignin-induced stable vaterite as a support matrix for integrated artificial photosynthesis through the encapsulation of key active components such as the photosensitizer (eosin y, EY) and redox enzyme (L-glutamate dehydrogenase, GDH). The lignin-vaterite/EY/GDH photobiocatalytic platform enabled the regeneration of the reduced nicotinamide cofactor under visible light and facilitated the rapid conversion of alpha-ketoglutarate into L-glutamate (initial conversion rate, 0.41 mM h(-1); turnover frequency, 1060 h(-1); and turnover number, 39,750). The lignin-induced vaterite structure allowed for long-term protection and recycling of the active components while facilitating the photosynthesis reaction due to the redox-active lignin. Succession of stability tests demonstrated a significant improvement of GDH's robustness in the lignin-vaterite structure against harsh environments. This work provides a simple approach for solar-to-chemical conversion using a sustainable, integrated light-harvesting system.
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