A Simple Fluorescence Sensor Based on Merocyanine 540-MnO2 System to Detect Hypochlorite

A. Şenol
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Abstract

Merocyanine 540 (MC540)-MnO2 system-based fluorescence sensor is reported as an anion sensor in aqueous solution. MnO2 was synthesized in the presence of KMnO4 and CTAB using MOPS buffer. The formation of MnO2 was first confirmed by a color change and characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and absorption spectroscopy techniques. Next, the interaction of MC540 with MnO2 in aqueous solution was investigated at various conditions by UV–Vis. absorption and fluorescence spectroscopy and the MC540-MnO2 system to use in fluorescence sensor studies was determined. The sensing ability of the MC540-MnO2 was tested to detect anions as a “Turn-off” fluorescent sensor. The MC540-MnO2 revealed to be high selectivity and sensitivity to detect ClO- ions without being affected by the other thirteen anions. The detection limits for ClO- were evaluated in two different concentration ranges and calculated to be 0.14 µM at 0.33-4.46 µM and 0.38 µM at 5.06-14.30 µM, respectively. Furthermore, interference experiments for ClO- in the presence of other anions were carried out, and it turned out that the system could detect ClO- without being affected by other anions.
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基于 Merocyanine 540-MnO2 系统的简易荧光传感器用于检测次氯酸盐
据报道,基于 Merocyanine 540 (MC540)-MnO2 系统的荧光传感器是水溶液中的阴离子传感器。MnO2 是在 KMnO4 和 CTAB 的存在下使用 MOPS 缓冲液合成的。首先通过颜色变化确认了 MnO2 的形成,并使用 X 射线衍射 (XRD)、傅立叶变换红外光谱 (FTIR) 和吸收光谱技术对其进行了表征。接着,通过紫外可见吸收光谱和荧光光谱研究了 MC540 与水溶液中二氧化锰在不同条件下的相互作用,并确定了用于荧光传感器研究的 MC540-MnO2 系统。测试了 MC540-MnO2 作为 "关闭 "荧光传感器检测阴离子的传感能力。结果表明,MC540-MnO2 在检测 ClO- 离子方面具有很高的选择性和灵敏度,而不受其他 13 种阴离子的影响。在两个不同的浓度范围内对 ClO- 的检测限进行了评估,计算结果分别为 0.33-4.46 µM 时为 0.14 µM,5.06-14.30 µM 时为 0.38 µM。此外,还进行了其他阴离子对 ClO- 的干扰实验,结果表明该系统可以检测 ClO-,而不受其他阴离子的影响。
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