纳米花
沸石咪唑盐骨架
甲酸脱氢酶
吸附
涂层
格式化
固定化酶
咪唑酯
化学
介孔材料
化学工程
介孔二氧化硅
材料科学
组合化学
纳米技术
酶
金属有机骨架
无机化学
有机化学
催化作用
工程类
作者
Yaoxuan Li,Lihang Yan,Guanhua Liu,Huaxun Chen,Hao Zhao,Lihui Wang,Jing Gao,Yunting Liu,Xiaobing Zheng,Yanjun Jiang
标识
DOI:10.1016/j.cej.2023.143198
摘要
Carbon capture, utilization and storage have become a hot topic in recent years, and enzymatic CO2 reduction benefits from high selectivity, high efficiency and mild conditions making it promising. However, the low solubility of CO2, poor stability of free enzyme and high cost of coenzyme limit the application. Therefore, mesoporous silica nanoflower (SNF) was used to immobilize formate dehydrogenase (FDH) by electrostatic adsorption followed by the coating of a multifunctional zeolitic imidazolate framework (ZIF-8) layer by sequential coating of Zn2+ and 2-methylimidazole (2-MeIm), thus obtaining a novel integrated nanocatalyst [email protected]@SNF. Regulated by controlling the ratio of ligands, the ZIF-8 coating layer not only protected the enzyme and prevented leakage, but also increased the local CO2 concentration using the imidazole group of ZIF-8 which improved the CO2 adsorption by 34.5% compared with SNF. And the expensive NADH was regenerated by the coupled electrocatalysis. The optimized integrated nanocatalyst showed excellent stability and reusability. Highly efficient electroenzymatic CO2 reduction was achieved with 1.38 mM formate yield after 3 h, 48.4% higher than that without ZIF-8 layer.
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