Highly Hydrophilic ZIF-8 as a Carbonic Anhydrase Mimetic Catalyst for Promoting CO 2 Absorption

作者：Yuchen Zhou, Yu Wang, Zezhi Chen, Huijuan Gong, Lu Chen, Huiqiang Yu · 发表于：The Journal of Physical Chemistry C · 年份：2023 · DOI：10.1021/acs.jpcc.3c00345 · 被引用次数：32 · 研究领域：Enzyme function and inhibition、Nanomaterials for catalytic reactions、Carbon dioxide utilization in catalysis

Carbonic anhydrase (CA) is an enzyme with unparallele d catalytic activity in CO 2 hydration. However, its high cost and low stability seriously restrict its industrial application in CO 2 absorption. Constructing CA mimics is a promising strategy to overcome the above limitations. However, to date, a majority of mimics reported are suffering from laborious synthetic processes, harsh synthetic conditions, and costly ligand materials. Therefore, developing novel CA mimics with higher applicability remains a high priority. Due to the structural similarity between zeolite imidazolate framework (ZIF)-8 and natural carbonic anhydrase (CA), ZIF-8 may be considered as a potential CA-mimetic catalyst for CO 2 absorption. To validate this assumption, ZIF-8 and hydrophilic ZIF-8-TA were synthesized and the results from subsequent CO 2 absorption experiments indicated that the synthesized catalysts could significantly enhance CO 2 absorption in water and common alkaline solutions. The addition of 1.0 wt % ZIF-8 in water and different alkaline solutions respectively increased the average CO 2 absorption rate by 42.35 and 6.78–24.51%, while the addition of 1.0 wt % of ZIF-8-TA increased the CO 2 absorption rate by 81.80 and 18.16–34.39%, respectively. Besides, both catalysts possessed excellent reusability that they retained high performance even after five cycles of absorption and regeneration. Through esterase experiments, it was confirmed that ZIF-8 and ZIF-8-TA exhibited higher CA-mim...