A bifunctional anionic Zn(II)-organic framework for adsorption and fluorescence sensing of Pb2 + in rice

The design of advanced functional materials that integrate multiple properties into a single platform represents a significant challenge in materials science. Herein, a three-dimensional anionic Zn-based metal-organic framework ( Zn-MOF ) was designed and synthesized. This material capable of both adsorption and fluorescence sensing of Pb 2+ ions. The removal process is achieved through a multi-mechanism synergy, including electrostatic interaction, ion exchange, and coordination. Concurrently, the adsorption process thereby causes a fluorescence response that is correlated to the Pb 2+ concentration, facilitating its quantification. Furthermore, the framework exhibits excellent fluorescence quenching response towards nitrobenzene (NB), demonstrating its extended application potential for detecting a broader spectrum of hazardous pollutants. This work highlights the significant promise of anionic MOFs in designing integrated materials for environmental remediation and monitoring. A zinc-based metal–organic framework (Zn-MOF) with an anionic framework was developed. This material integrates both adsorption and sensing functions, enabling the simultaneous efficient removal and sensitive detection of heavy metals Pb 2+ from rice and water. ● A Bifunction material for lead removes and detects heavy metal Pb 2+ ● Effectively attract and capture Pb 2+ via electrostatic interactions and coordination. ● The Zn-MOF was also highly sensitive to NB with strong fluorescence quenching.