Dye-Encapsulated Lanthanide-Based Metal–Organic Frameworks as a Dual-Emission Sensitization Platform for Alachlor Sensing
Meiling Li, Yan Gao, Weiting Yang, Chaowei Zhang, Yu Fang, Cong Wang, Shuyan Song, Qinhe Pan
Abstract
As an important factor affecting global agricultural output, pesticides have a significant impact on the ecosystem. It is an urgent task to accurately and conveniently detect pesticide residues after their application. Herein, a fluorescent dye@MOF platform was designed via the encapsulation of rhodamine B (RhB) into the MOF structure (named RhB@HNU-48), which can significantly enhance the sensing sensitivity of alachlor with an ultralow detection limit of 0.59 ppb. The improved sensitivity of RhB@HNU-48 to pesticides was attributed to the host–guest interactions that affect the excitation and emission spectra of the composites. Based on the sensing capability of RhB@HNU-48, a logic gate was built to evaluate the safety level of alachlor residues in rivers and soil. The preparation of photofunctionalized MOF composites through modulation of host–guest interactions offers a promising strategy for the construction of desired sensors for agricultural residues.