A Highly Selective Economical Sensor for 4-Nitrophenol
A Highly Selective Economical Sensor for 4-Nitrophenol
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DOI：
10.3390/suschem2030028
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发表时间：
2021-08
影响因子：
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通讯作者：
Thuy Le;Y. Khan;N. Speller;Mujeebat Bashiru;Samantha Macchi;I. Warner;Noureen Siraj
中科院分区：
文献类型：
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作者：
Thuy Le;Y. Khan;N. Speller;Mujeebat Bashiru;Samantha Macchi;I. Warner;Noureen Siraj
本文提出了一种廉价的市售传感器用于检测4-硝基苯酚（4 NP）污染物。使用荧光素钠（NaFl）作为传感器来检测乙腈（MeCN）中的痕量4 NP。使用紫外-可见吸收和荧光分光光度法研究了NaFl在两种不同溶剂MeCN（非质子）和水（质子）中的物理性质，其中具有不同浓度的不同硝基芳烃。在水性介质中，NaFl的物理化学性质在硝基芳族化合物的存在下没有改变。然而，在MeCN中的光动力学的检查表明，NaFl对4 NP极其敏感（检测限：0.29 μg/mL）。与其他硝基芳族化合物相比，当溶解在MeCN中时，NaFl对4 NP的这种极端特异性归因于4 NP与NaFl在不存在水的情况下的氢键合，导致静态和动态淬灭过程。因此，NaFl被证明是用于4 NP的简单、廉价、灵敏和鲁棒的光学关闭传感器。
Herein, an inexpensive commercially available sensor is presented for the detection of 4-nitrophenol (4NP) pollutant. Sodium fluorescein (NaFl) is used as a sensor to detect trace amounts of 4NP in acetonitrile (MeCN). The photophysical properties of NaFl were studied in two different solvents, MeCN (aprotic) and water (protic), with varying concentrations of different nitroaromatics using UV-visible absorption and fluorescence spectrophotometry. In an aqueous medium, photophysical properties of NaFl did not change in the presence of nitroaromatics. However, examination of the photodynamics in MeCN demonstrated that NaFl is extremely sensitive to 4NP (limit of detection: 0.29 µg/mL). This extreme specificity of NaFl towards 4NP when dissolved in MeCN, as compared to other nitroaromatics, is attributed to hydrogen bonding of 4NP with NaFl in the absence of water, resulting in both static and dynamic quenching processes. Thus, NaFl is demonstrated as a simple, inexpensive, sensitive, and robust optical turn off sensor for 4NP.