Enhanced luminescence sensing of pymetrozine pesticide in Cow milk using a Cd(ii) coordination network with sensitivity up to 0.448 ppm†

Abstract

This study presents the synthesis, structural characterization, and versatile applications of a novel cadmium-based coordination polymer (CP), [{Cd(Py)₂I₂}·{Cd₂(Py)₅(BTC)(H₂O)I}·{H₂O}]_n(CP-1), for the detection and degradation of the pesticide pymetrozine (PMZ). Detailed structural analysis using single-crystal X-ray diffraction, PXRD, SEM, EDAX, and FTIR confirmed the unique topology and chemical stability of CP-1. The MOF exhibited excellent luminescence properties, functioning as an efficient fluorescent probe with a high quenching constant (K_sv = 3.95 × 10⁴ M⁻¹) and a detection limit of 0.153 ppm in DMSO. Additionally, CP-1 showed strong photocatalytic performance, degrading 93.87% of PMZ under UV light within 120 minutes. A key highlight of the study is the ability of CP-1 to detect PMZ in milk samples, achieving an impressive quenching efficiency of 89.89% and a detection limit of 0.448 ppm, underscoring its practical utility in food safety monitoring. Furthermore, CP-1 demonstrated excellent recyclability with minimal loss of efficiency over multiple cycles, making it a highly promising material for sustainable environmental applications in pollutant sensing and remediation.