Rhodamine-based fluorescent polyacrylic nanoparticles: A highly selective and sensitive chemosensor for Fe (II) and Fe (III) cations in water
Rhodamine-based fluorescent polyacrylic nanoparticles: A highly selective and sensitive chemosensor for Fe (II) and Fe (III) cations in water
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DOI：
10.1016/j.jece.2021.105082
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发表时间：
2021-01-21
影响因子：
7.7
通讯作者：
Mahdavian, Ali Reza
中科院分区：
文献类型：
--
作者：
Ghezelsefloo, Sara;Rad, Jaber Keyvan;Mahdavian, Ali Reza
Fe 2+，特别是Fe 3+在我们的日常生活中很重要，它们的缺乏或过量可能导致严重的疾病和传染病。现有的荧光传感器大多由小分子组成，并且可能在有机介质中工作，具有较长的响应时间和不足的检测限，这限制了它们的广泛应用。采用半连续乳液聚合法制备了罗丹明B乙二胺丙烯酸酯（RhAcL-3）荧光聚（甲基丙烯酸甲酯-甲基丙烯酸缩水甘油酯）纳米粒子。采用FTIR、1H NMR、UV-Vis、SEM和DLS等技术对所制备的RhAcL-3聚丙烯酸纳米粒的化学结构进行了表征，结果表明，所制备的纳米粒具有光滑的球形形貌，平均粒径为46 nm，粒径分布窄（多分散指数为0.09）。RhAcL-3纳米颗粒的水分散体表现出立即和明显的颜色变化，以及在590 nm处的荧光发射增强后，添加Fe 2+和Fe 3+离子分别高达2倍和2.2倍。这是由于这些离子与罗丹明B中的螺内酰胺部分螯合，从而形成开环酰胺形式。发现其它金属离子的存在对上述亲和性和传感作用无干扰。RhAcL-3传感器对Fe ~（2+）和Fe ~（3+）的线性动态检测范围（4-320 μ M）和检测限分别为2.63和2.5 μ M。结果表明，该纳米粒子具有响应快、线性检测范围宽、灵敏度高、检测限低等特点，可作为Fe 2+和Fe 3+离子的比色和荧光传感器，具有广阔的应用前景。
Fe2+ and specially Fe3+ are important in our daily life and their deficiency or excess amounts may cause serious disorders and infectious diseases. Most of their existing fluorescent sensors consist of small molecules and may operate in organic media with prolonged response time and inadequate detection limit which restrict their widespread applications. Fluorescent poly(methyl methacrylate-co-glycidyl methacrylate) nanoparticles bearing Rhodamine B ethylenediamine acrylate (RhAcL-3) were prepared through semi-continues emulsion polymerization. Chemical structure of the prepared RhAcL-3 polyacrylic nanoparticles with smooth spherical morphology, average particle size of 46 nm and narrow size distribution (polydispersity index of 0.09) were completely characterized by FTIR, H-1 NMR, UV-Vis, SEM and DLS techniques. Water dispersion of RhAcL-3 nanoparticles demonstrated an immediate and apparent color change together with enhancement in fluorescence emission at 590 nm after addition of Fe2+ and Fe3+ ions up to 2 and 2.2-folds, respectively. This was attributed to chelation of these ions to spirolactam moiety in Rhodamine B to consequate open-ring amide form. It was found that the presence of some other metal cations had no interference on the above affinity and sensing role. Linear dynamic detection range (4-320 mu M) and detection limit of RhAcL-3 sensor toward Fe2+ and Fe3+ were estimated 2.63 and 2.5 mu M, respectively. The results suggest that these prepared nanoparticles could be utilized as colorimetric and fluorescent sensor with instant responsivity, wide linear detection range, high sensitivity and low detection limit for Fe2+ and Fe3+ ions in future advances and applications.