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Lu Y, Song Y, Peng L, Rao X, Tan KB, Zhou SF, Zhan G. Construction of Immobilized Enzymes with Yeast and Metal-Organic Frameworks for Enhanced Biocatalytic Activities. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37437263 DOI: 10.1021/acsami.3c07088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
Metal-organic frameworks (MOFs) have become promising host materials for enzyme immobilization and protection. Herein, ZIF-8 nanocubes were successfully self-assembled onto yeast as a biological template to obtain hybrid Y@ZIF-8. The size, morphology, and loading efficiency of ZIF-8 nanoparticles assembled on yeast templates can be well-regulated by adjusting the various synthetic parameters. Particularly, the amount of water significantly affected the particle size of ZIF-8 assembled on yeast. Through using a cross-linking agent, the relative enzyme activity of Y@ZIF-8@t-CAT could be greatly enhanced and remained the highest even after seven consecutive cycles, with improved cycling stability, as compared to that of Y@ZIF-8@CAT. In addition to the effect of the physicochemical properties of Y@ZIF-8 on the loading efficiency, the temperature tolerance, pH tolerance, and storage stability of Y@ZIF-8@t-CAT were also systematically investigated. Importantly, the catalytic activity of free catalase was decreased to 72% by 45 days, while the activity of the immobilized catalase remained above 99%, suggesting good storage stability. The present work demonstrates that yeast-templated ZIF-8 nanoparticles have a high potential to be used as biocompatible immobilization materials and are promising candidates for the preparation of effective biocatalysts in biomedicine applications.
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Affiliation(s)
- Yuting Lu
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Academy of Advanced Carbon Conversion Technology, Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian 361021, P. R. China
| | - Yibo Song
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Academy of Advanced Carbon Conversion Technology, Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian 361021, P. R. China
| | - Lingling Peng
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Academy of Advanced Carbon Conversion Technology, Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian 361021, P. R. China
| | - Xiaoping Rao
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Academy of Advanced Carbon Conversion Technology, Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian 361021, P. R. China
| | - Kok Bing Tan
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Academy of Advanced Carbon Conversion Technology, Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian 361021, P. R. China
| | - Shu-Feng Zhou
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Academy of Advanced Carbon Conversion Technology, Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian 361021, P. R. China
| | - Guowu Zhan
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Academy of Advanced Carbon Conversion Technology, Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian 361021, P. R. China
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Cha X, Wang X, Huang M, Cai D, Sun K, Jiang J, Zhou SF, Zhan G. Fabrication of supported Pt/CeO 2 nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies. Dalton Trans 2023; 52:3661-3670. [PMID: 36847219 DOI: 10.1039/d3dt00181d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
Supported Pt/CeO2 catalysts have been widely used in carbon monoxide (CO) oxidation; however, the high oxygen vacancy formation energy (Evac) in the process leads to the poor performance of these catalysts. Herein, we explored different element (Pr, Cu, or N) doped CeO2 supports using Ce-based metal-organic frameworks (MOFs) as precursors via calcination treatment. The obtained CeO2 supports were used to load Pt nanoparticles. These catalysts were systematically characterized by various techniques, and they showed superior catalytic activity for CO oxidation compared to undoped catalysts which could be attributed to the formation of Ce3+, and high amounts of Oads/(Oads + Olat) and Ptδ+/Pttotal. Moreover, density functional theory calculations with on-site Coulomb interaction correction (DFT+U) were performed to provide atomic-scale insights into the reaction process by the Mars-van Krevelen (M-vK) mechanism, which revealed that the element-doped catalysts could simultaneously reduce the adsorption energies of CO and lower reaction energy barriers in the *OOCO associative pathway.
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Affiliation(s)
- Xingwen Cha
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Xueying Wang
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Mingzhen Huang
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Dongren Cai
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Kang Sun
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry (CAF), 16 Suojin Five Village, Nanjing, Jiangsu, 210042, P. R. China
| | - Jianchun Jiang
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry (CAF), 16 Suojin Five Village, Nanjing, Jiangsu, 210042, P. R. China
| | - Shu-Feng Zhou
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Guowu Zhan
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
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Long L, Xu K, Bing Tan K, Cai D, Yang Y, Zhou SF, Zhan G. Highly Active Mn-Cu Bimetallic Oxide Catalyst Assembled as 3D-printed Monolithic Agitating Paddles for Advanced Oxidation Process. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.118278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Effects of the Crystalline Properties of Hollow Ceria Nanostructures on a CuO-CeO2 catalyst in CO Oxidation. MATERIALS 2022; 15:ma15113859. [PMID: 35683157 PMCID: PMC9181753 DOI: 10.3390/ma15113859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/16/2022] [Accepted: 05/23/2022] [Indexed: 01/25/2023]
Abstract
The development of an efficient and economic catalyst with high catalytic performance is always challenging. In this study, we report the synthesis of hollow CeO2 nanostructures and the crystallinity control of a CeO2 layer used as a support material for a CuO-CeO2 catalyst in CO oxidation. The hollow CeO2 nanostructures were synthesized using a simple hydrothermal method. The crystallinity of the hollow CeO2 shell layer was controlled through thermal treatment at various temperatures. The crystallinity of hollow CeO2 was enhanced by increasing the calcination temperature, but both porosity and surface area decreased, showing an opposite trend to that of crystallinity. The crystallinity of hollow CeO2 significantly influenced both the characteristics and the catalytic performance of the corresponding hollow CuO-CeO2 (H-Cu-CeO2) catalysts. The degree of oxygen vacancy significantly decreased with the calcination temperature. H-Cu-CeO2 (HT), which presented the lowest CeO2 crystallinity, not only had a high degree of oxygen vacancy but also showed well-dispersed CuO species, while H-Cu-CeO2 (800), with well-developed crystallinity, showed low CuO dispersion. The H-Cu-CeO2 (HT) catalyst exhibited significantly enhanced catalytic activity and stability. In this study, we systemically analyzed the characteristics and catalyst performance of hollow CeO2 samples and the corresponding hollow CuO-CeO2 catalysts.
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