聚亚乙基亚胺/水杨醛改性纤维素希夫碱用于选择性和灵敏的 Fe 检测。
A polyethylenimine/salicylaldehyde modified cellulose Schiff base for selective and sensitive Fe detection.
机构信息
Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Shaanxi University of Science and Technology, Xian 710021, China.
Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Shaanxi University of Science and Technology, Xian 710021, China.
出版信息
Carbohydr Polym. 2020 Jan 15;228:115379. doi: 10.1016/j.carbpol.2019.115379. Epub 2019 Sep 24.
We describe a new solid-state colorimetric sensor synthesized by micro-crystalline cellulose (MCC) in the presence of polyethylenimine (PEI) and salicylaldehyde (SA) via an oxidation process and two successive Schiff base reactions. The formation of the Fe complex led to color change detectable by eye, as well as an absorption peak at 501 nm causing fluorescence quenching. The signal was linear with the concentration ranging from 4 to 20 ppm; the detection limit is 0.01 ppm, making this a sensitivity and reliable monitoring platform for Fe detection. Orbital electron distribution and computational studies were also carried out using density functional theory (DFT) to better supplement the sensor's detection performance. Finally, the sensing mechanism is discussed in detail.
我们描述了一种新的固态比色传感器，它是通过微结晶纤维素（MCC）在聚亚乙基亚胺（PEI）和水杨醛（SA）的存在下通过氧化过程和两个连续的希夫碱反应合成的。Fe 配合物的形成导致颜色变化可通过肉眼检测，并且在 501nm 处出现吸收峰导致荧光猝灭。信号与浓度在 4 至 20ppm 之间呈线性关系；检测限为 0.01ppm，这使其成为 Fe 检测的灵敏度和可靠监测平台。还使用密度泛函理论（DFT）进行了轨道电子分布和计算研究，以更好地补充传感器的检测性能。最后，详细讨论了传感机制。
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