AI Article Synopsis
- - A new colorimetric method using iodide ions and Cu-MOF catalysis has been created for easy and low-cost detection of iron (Fe) that can be visually observed.
- - The combination of iodide and Cu-MOF enhances the system's catalytic efficiency, improving the detection limit for Fe from about 10 μM to 200 nM.
- - The sensing system shows strong selectivity against other metal ions and has potential for practical application in analyzing Fe in real samples.
Article Abstract
In this paper, a novel colorimetric strategy based on iodide ion (I) and Cu-MOF catalysis was developed for simple, low-cost, and naked-eye detection of Fe. Both I and MOFs display catalytic activity toward peroxidase substrate 3,3',5,5'-tetramethylbenzidine (TMB). Adsorption and embedding of I in Cu-MOF generates Cu-MOF/I with a three-dimensional porous structure that exhibits higher specific surface area, providing more active sites to facilitate interaction with TMB, resulting in enhanced catalytic efficiency. Reports have shown that Fe can oxidize TMB in the absence of HO. We found that as Fe concentration increases, the color of the system gradually deepens and the UV absorption peak gradually increases, thus providing a colorimetric sensor for quantitative Fe detection. The detection limit (LOD) obtained in the presence of I is 200 nM; however, in the absence of I, the LOD is approx. 10 μM. Thus, the sensing system is ideal for signal amplified analysis of Fe. In the presence of various interfering metal ions, the developed sensing system displays excellent selectivity. Additionally, the practical application to Fe detection in real samples is explored.
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| http://dx.doi.org/10.1039/d1ay01612a | DOI Listing |
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