Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology (VIT), Vellore, Tamil Nadu, 632014, India.
Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology (VIT), Vellore, Tamil Nadu, 632014, India.
Environ Res. 2023 Dec 15;239(Pt 1):117399. doi: 10.1016/j.envres.2023.117399. Epub 2023 Oct 12.
The escalating predicament of water pollution has spurred the development of new chromogenic materials for the efficient detection/screening of toxic mercuric (Hg) ions. In this study, we report a simple and efficient detection stratagem by infusing a chromogenic ion-receptor (BTDA), i.e., 4-(benzothiazol-2-yl)-N, N-dimethylaniline onto a structurally intertwined meso-/macro-pore polymer template for the target-specific sensing of ultra-trace Hg. The structural/surface features of the monolithic polymer template, prepared from glycidyl methacrylate (GMA) monomer crosslinked with ethylene glycol dimethacrylate (EGDMA), facilitate voluminous infusion and uniform decoration of ion-receptor molecules across the continuous porous poly(GMA-co-EGDMA) framework, resulting in a solid-state colorimetric sensory system. The bimodal polymer network's intriguing surface and structural morphology of the chromogenic sensor material are interpreted using scanning/transmission electron microscopy, X-ray diffraction, photoelectron spectroscopy, energy dispersive X-ray spectrometry, optical spectroscopy, surface area, porosity and thermal analysis. The proposed Hg sensor offers a linear response range of 1-150 μg/L, with a detection and quantification limit of 0.29 and 0.97 μg/L, respectively. The poly(GMA-co-EGDMA)-BTDA sensor exhibits a quick ion-sensing response (40 s) with distinct color transitions from pastel yellow to olive as a function of increasing Hg concentration. The matrix tolerance studies for the proposed sensory system reveal high selectivity for Hg, with a recovery of ≥99.2% in on-site environmental samples. The sensor material exhibits excellent data reproducibility and reliability up to seven cycles of reusability.
水污染问题日益严峻，这促使人们开发新型显色材料，以实现对有毒汞离子的高效检测/筛选。在本研究中，我们报告了一种简单而高效的检测策略，即将显色离子受体（BTDA），即 4-（苯并噻唑-2-基）-N，N-二甲基苯胺注入到结构交织的介孔/大孔聚合物模板中，用于超痕量 Hg 的目标特异性传感。由甲基丙烯酸缩水甘油酯（GMA）单体与乙二醇二甲基丙烯酸酯（EGDMA）交联制备的整体聚合物模板的结构/表面特征有利于大量注入和均匀装饰离子受体分子穿过连续多孔聚（GMA-co-EGDMA）骨架，从而形成固态比色传感系统。使用扫描/透射电子显微镜、X 射线衍射、光电子能谱、能量色散 X 射线光谱、光谱学、表面积、孔隙率和热分析对显色传感器材料的双模态聚合物网络的有趣表面和结构形态进行了解释。所提出的 Hg 传感器具有 1-150μg/L 的线性响应范围，检测限和定量限分别为 0.29 和 0.97μg/L。聚（GMA-co-EGDMA）-BTDA 传感器具有快速的离子传感响应（40s），随着 Hg 浓度的增加，颜色从柔和的黄色到橄榄色发生明显的转变。对所提出的传感系统的基质容忍性研究表明，该传感器对 Hg 具有高选择性，在现场环境样品中的回收率≥99.2%。传感器材料在七个循环的可重复使用中表现出出色的数据重现性和可靠性。
