@article{Chen2022, 
author = {Changwei Chen and Mohammadreza Kosari and Meizan Jing and Chi He},
title = {Microwave-assisted synthesis of bimetallic NiCo-MOF-74 with enhanced open metal site for efficient CO2 capture},
year = {2022},
journal = {Environmental Functional Materials},
volume = {1},
number = {3},
pages = {253-266},
keywords = {CO2 capture, Microwave-assisted synthesis, Bimetallic metal–organic frameworks, NiCo-MOF-74, Open metal site},
url = {https://www.sciopen.com/article/10.1016/j.efmat.2023.01.002},
doi = {10.1016/j.efmat.2023.01.002},
abstract = {Metal–organic frameworks (MOFs) containing two different inorganic metal nodes (known as bimetallic MOFs) could exhibit enhanced CO2 adsorption compared to their monometallic counterparts. Herein, a series of bimetallic NiCo-MOF-74 synthesized by microwave-assisted method were investigated for CO2 adsorption. It was revealed that narrow micropore channel with open metal site (OMS) of the bimetallic NiCo-MOF-74 influence CO2 binding affinity and CO2/N2 adsorption. The CO2 uptake of Ni1Co1-MOF-74 at 0 ​℃ and 1 ​bar (100 ​kPa) was 8.30 ​mmol ​g−1 which is higher than those of Ni-MOF-74 (3.99 ​mmol ​g−1), Ni6Co1-MOF-74 (3.62 ​mmol ​g−1), Ni1Co6-MOF-74 (6.40 ​mmol ​g−1) and Co-MOF-74 (5.03 ​mmol ​g−1). While this could be related to the high specific surface area of Ni1Co1-MOF-74, Ni1CO2-MOF-74 with relatively low specific surface areas still shows good CO2 adsorption capacity up to 5.70 ​mmol/g, which is higher than those of adsorbents Ni-MOF-74, Ni6Co1-MOF-74 and Co-MOF-74, indicating that adsorption performance mainly relies on coordinated metals. Ni1Co1-MOF-74 showed remarkable recyclability performance, ranking selectivity of CO2/N2 reach up to 34, and suitable isosteric heat (31–23 ​kJ ​mol−1), manifesting a great probability for industrial CO2 capture. As revealed, incorporated Ni2+/Co2+ nodes within Ni1Co1-MOF-74, which are acting as active and open sites for CO2 capture, led to the synergetic effects comprising of micropores as well as dense dual-metal sites.}
}