article · Applied Organometallic Chemistry
A chemical sensor based on a functionalised zirconium metal-organic framework has been developed to detect cadmium and mercury ions in water. The material was synthesised by reacting an amino-functionalised framework with 2-hydroxyacetophenone, creating a sensor with a predominantly mesoporous structure. Analytical characterisation confirmed the successful chemical modification of the framework. Testing established the optimal conditions for dual colorimetric and fluorometric detection of both metal ions. The sensor delivers rapid performance, achieving a stable spectroscopic signal in under 30 seconds. Validation following International Conference on Harmonisation guidelines confirmed high sensitivity, precision, and linearity. When evaluated on various tap water samples, the sensor demonstrated high selectivity and sensitivity in identifying cadmium and mercury contaminants.
Cadmium and mercury are hazardous heavy metals that pose serious risks to human health and water security. Fast and reliable methods to monitor drinking water are essential for environmental protection and public safety. This sensor provides a dual-mode detection technique that produces clear optical and fluorescent signals in under half a minute, offering an effective tool for water quality monitoring.
The technology could enable rapid water testing kits and real-time monitoring devices for municipal water authorities, utility companies, and environmental testing laboratories. Having been validated on tap water samples following standard regulatory guidelines, the research represents an applied and tested laboratory-scale sensor. Further commercialisation would require scalable framework synthesis, field durability testing, and integration into portable diagnostic instruments.
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Chemical sensor based on NH 2 ‐UiO‐66(Zr) have been developed for rapid detection of Cd 2+ and Hg 2+ ions. The developed 2HA = N‐UiO‐66(Zr) sensor was prepared by the condensation of the Zr‐metal–organic framework (MOF) with 2‐hydroxyacetophenone. The NH 2 ‐UiO‐66(Zr) and 2HA = N‐UiO‐66(Zr) sensor were characterized by scanning electron microscopy (SEM), X‐ray diffractometer (XRD), Fourier transform infrared (FT‐IR), X‐ray photoelectron spectroscopy (XPS), and Brunner–Emmet–Teller (BET). The characterization results shown that 2‐hydroxyacetophenone was successfully introduced on the Zr‐based MOF and that the pore structure of 2HA = N‐UiO‐66(Zr) sensor mainly contains mesopores. Many experimental studies have been conducted to find out the optimum conditions for colorimetric and fluorometric determining of the Cd 2+ and Hg 2+ ions by the 2HA = N‐UiO‐66(Zr) sensor. The response time, for the sensor, that is necessary to achieve a steady spectroscopic signal was less than 30 s. The suggested methods were validated in terms of the lowest limit of detection (LOD), the lowest limit of quantification (LOQ), linearity, and precision according to International Conference on Harmonization (ICH) guidelines. As a result, the 2HA = N‐UiO‐66(Zr) sensor was successfully used to determine Cd 2+ and Hg 2+ ions in a variety of tap water samples with great sensitivity and selectivity.
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DOI: 10.1002/aoc.7070
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