AI Article Synopsis
- Pollution from hexavalent chromium ions is a serious health risk, prompting the creation of a novel two-dimensional (2D) Ni-MOF designed to trap these harmful ions.
- This Ni-MOF features flexible layers that can swap nitrate ions for chromium oxide (CrO) without compromising its structure, thanks to strong electrostatic and hydrogen bonding interactions.
- The study finds that the Ni-MOF effectively captures and senses hexavalent chromium, achieving a sensitivity of 2.091 μA/μM and a detection limit of 0.07 μM.
Article Abstract
Pollution of surface water by heavy metal hexavalent chromium ions poses a serious threat to human health; herein, a two-dimensional (2D) cationic breathing Ni-MOF with free nitrate ions between the layers was designed and synthesized according to the characteristics of hexavalent chromium ions, {[Ni(L)](NO)·5HO} (L = 1,3,5-tris[4-(imidazol-1-yl)phenyl]benzene). The flexible layer spacing of the 2D breathing Ni-MOF allows the exchange of NO by CrO without destroying the original structure. Electrostatic and hydrogen bonding interactions between CrO and Ni-MOF facilitate its exchange with NO. Moreover, CrO exhibits a higher binding energy with Ni-MOF compared to NO, and the hydrophobic channels of Ni-MOF favor CrO trapping due to its lower hydration energy. Consequently, Ni-MOF demonstrates both effective sorption and electrochemical sensing of Cr(VI), achieving a sensitivity of 2.091 μA μM and a detection limit of 0.07 μM.
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| http://dx.doi.org/10.1021/acs.inorgchem.4c03396 | DOI Listing |
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