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A dual stable MOF constructed through ligand exchange for enzyme immobilization with improved performance in biodiesel production

Author

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  • Zou, Zhiqiang
  • Zhou, Hao
  • Dai, Lingmei
  • Liu, Dehua
  • Du, Wei

Abstract

The poor stability of metal-organic frameworks (MOFs) limits their practical applications in many fields. Zeolitic imidazolate frameworks (ZIF-8) has been widely studied as an enzyme immobilization carrier. In this paper, the stability of ZIF-8-immobilized lipase in methanolysis for biodiesel production was studied. Fatty acids as conventional substances involved in lipase-mediated natural acylation were found to destroy the structure of ZIF-8 through ligand exchange mechanism. A new MOF was successfully constructed by using phthalic acid (pKa much smaller than 2-methylimidazole) as the exchange ligand. This novel MOF (abbreviated as LeZIF-8-PAX, X represents reaction hours) had dual stability in water and even in pure oleic acid. Lipase immobilized on LeZIF-8-PA0.5 showed higher specific activity. FTIR analysis showed that enzyme molecule immobilized on Le-ZIF-8-PA0.5 had higher conformational flexibility than that with ZIF-8 as the carrier. When applied to methanolysis for biodiesel production, ET 2.0/LeZIF-8-PA0.5 maintained intact morphology while ET 2.0/ZIF-8 almost lost its original morphology, with enzyme activity of 81.5% and 60.2% retained respectively after 5 batch reactions. This work is anticipated to provide new ideas for constructing stable MOFs and promoting the application of MOFs-immobilized enzymes in many chemical and pharmaceutical industrial processes.

Suggested Citation

  • Zou, Zhiqiang & Zhou, Hao & Dai, Lingmei & Liu, Dehua & Du, Wei, 2023. "A dual stable MOF constructed through ligand exchange for enzyme immobilization with improved performance in biodiesel production," Renewable Energy, Elsevier, vol. 208(C), pages 17-25.
    • Handle: RePEc:eee:renene:v:208:y:2023:i:c:p:17-25
    DOI: 10.1016/j.renene.2023.03.072
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    References listed on IDEAS

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    1. Zailan, Zarifah & Tahir, Muhammad & Jusoh, Mazura & Zakaria, Zaki Yamani, 2021. "A review of sulfonic group bearing porous carbon catalyst for biodiesel production," Renewable Energy, Elsevier, vol. 175(C), pages 430-452.
    2. Zhou, Junhui & Yu, Senshen & Kang, Helong & He, Rui & Ning, Yuxin & Yu, Yingyue & Wang, Meng & Chen, Biqiang, 2020. "Construction of multi-enzyme cascade biomimetic carbon sequestration system based on photocatalytic coenzyme NADH regeneration," Renewable Energy, Elsevier, vol. 156(C), pages 107-116.
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