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基于MoS2量子点荧光内滤作用测定环境水样中对硝基苯酚
Determination of p-Nitrophenol in Environmental Water Samples Based on MoS2 Quantum Dots by Fluorescence Inner Filter Effect

DOI: 10.12677/AAC.2019.93022, PP. 168-174

Keywords: 二硫化钼量子点，对硝基苯酚，内滤作用
Molybdenum Disulfide Quantum Dots, p-Nitrophenol, Inner Filter Effect

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Abstract:

以钼酸钠和L-半胱氨酸为原料，聚(4-苯乙烯磺酸钠)为修饰剂，通过一步水热反应法成功制备了二硫化钼量子点(MoS2 QDs)。所制备的MoS2 QDs在390 nm处有较强荧光发射(激发波长300 nm)，由于在碱性条件下，对硝基苯酚(p-NP)在390 nm处有明显吸收峰，因此p-NP对MoS2 QDs荧光具有较强内滤作用(IFE)，基于这种内滤作用建立了p-NP的分析新方法。该方法检出限(3σ)为0.13 μM，相对标准偏差RSD为1.2% (c = 15 μM, n = 11)。线性范围为1~20 μM。该方法成功应用于环境水样中p-NP的测定。
Molybdenum disulfide quantum dots (MoS2 QDs) were successfully prepared by one-step hydro-thermal reaction using sodium molybdate and L-cysteine as raw materials and poly (4-styrenesul- fonate) as a modifier. The prepared MoS2QDs have a strong fluorescence emission at 390 nm (ex-citation wavelength is 300 nm); p-NP is observed at 390 nm under alkaline conditions. Therefore, p-NP has a strong inner filter effect (IFE) on the fluorescence of MoS2 QD and a new analytical method for p-NP is established based on this IFE. The detection limit (3σ) of this method was 0.13 μM, and the relative standard deviation RSD is 1.2% (c = 15 μM, n = 11). The linear range is 1 - 20 μM. This method is successfully applied to the determination of p-NP in environmental water samples.

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