奥斯特瓦尔德成熟
热稳定性
材料科学
脂肪酶
化学工程
动力学分辨率
共价键
催化作用
纳米技术
产量(工程)
生物催化
结晶度
化学
有机化学
复合材料
反应机理
对映选择合成
酶
工程类
作者
Hao Zhao,Guanhua Liu,Yunting Liu,Liya Zhou,Li Ma,Ying He,Xiaobing Zheng,Jing Gao,Yanjun Jiang
出处
期刊:Nano Research
[Springer Nature]
日期:2022-08-27
卷期号:16 (1): 281-289
被引量:25
标识
DOI:10.1007/s12274-022-4769-5
摘要
The hollow spherical covalent organic frameworks (COFs) have a wide application prospect thanks to their special structures. However, the controllable synthesis of uniform and stable hollow COFs is still a challenge. We herein propose a self-templated method for the preparation of hollow COFs through the Ostwald ripening mechanism under ambient conditions, which avoids most disadvantages of the commonly used hard-templating and soft-templating methods. A detailed time-dependent study reveals that the COFs are transformed from initial spheres to hollow spheres because of the inside-out Ostwald ripening process. The obtained hollow spherical COFs have high crystallinity, specific surface area (2,036 m2·g−1), stability, and single-batch yield. Thanks to unique hollow structure, clear through holes, and hydrophobic pore environment of the hollow spherical COFs, the obtained immobilized lipase (BCL@H-COF-OMe) exhibits higher thermostability, polar organic solvent tolerance, and reusability. The BCL@H-COF-OMe also shows higher catalytic performance than the lipase immobilized on non-hollow COF and free lipase in the kinetic resolution of secondary alcohols. This study provides a simple approach for the preparation of hollow spherical COFs, and will promote the valuable research of COFs in the field of biocatalysis.
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