NiS2-Integrated Cd-Oxalate MOF: A Multifunctional Platform for Selective 2,4-D Amine Sensing and Efficient NR/EBT Photodegradation

Abstract

The excessive use of agrochemicals and synthetic dyes poses major environmental and health risks, requiring efficient detection and remediation strategies. Here, we report the synthesis and characterization of a cadmium-based metal-organic framework, [Cd(oxalate)0.5(H2O)2].H2O] (Cd-MOF), and its nickel disulfide-doped composite (NiS2/Cd-MOF). Structural analysis (PXRD, FTIR, SEM-EDS, SCXRD) confirmed the formation of a two-dimensional framework. Fluorescence sensing studies demonstrated selective detection of 2,4-D amine salt (DAS) with detection limits of 0.665 ppm (Cd-MOF) and 0.510 ppm (NiS2/Cd-MOF), attributed to improved electron transfer and active site availability. Both materials demonstrated remarkable photocatalytic efficiency under UV irradiation, with Cd-MOF achieving 87.61% degradation of Neutral Red, while NiS2/Cd-MOF reached 93.33% degradation of Eriochrome Black T. These findings underscore their promise as versatile candidates for environmental remediation and pollutant detection applications.