Metal Nanostructures for Environmental Pollutant Detection Based on Fluorescence

We propose a portable sensor, obtained by embedding luminol into the tetraethylorthosilicate/trietoxymethylsilane (TEOS/MTEOS) composite, for the quantitative determination of organic amino nitrogen and ammonium in water with the goal of achieving low levels of concentration. The method is based on the reaction between amino nitrogen compounds and hypochlorite to produce chloramino derivatives. Then, the remaining hypochlorite reacts with luminol sensor by producing a luminescence signal, which was measured by using a portable luminometer, being inversely proportional to nitrogen concentration. The liberation of the luminol from sensor is higher than 90% and the sensor is stable for at least a week at room temperature. This portable method was successfully validated and applied to the analysis of several real waters: fountain, river transition, lagoon, and seawater with recovery values between 92% and 112%, which indicated that the matrix effect was absent. The achieved limit of detection was around 10 µg·L−1, expressed as N. This sensor allows in situ monitoring owing to its simplicity, rapidity, and portability.

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“…[3] Environmental pollutants/2021/Updated guide on fluorescent metallic nanosystems used as optical sensors. [4] Separations…”

Section: Analytes/publication Year/covered Topic Referencementioning

confidence: 99%

Luminol Doped Silica-Polymer Sensor for Portable Organic Amino Nitrogen and Ammonium Determination in Water

2021

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“…In a previous study, Some scholars have described the effect of photophysics on the fluorescence of metal nanomaterials, and provide an updated guide on fluorescent metallic nano-systems used as optical sensors of heavy metal ions and pesticides in water [13]. Rapid Mercury determination with graphene-based sensors by OPEN ACCESS RECEIVED some authors, research directions of Mercury sensors are discussed, which will guide future research of Hg(II) sensors in biomedical and environmental monitoring applications [14].…”

Section: Introductionmentioning

confidence: 99%

ZnO-CNT/Nano-Au modified electrodes for the detection of trace Hg(II) in coastal seawater

Wang

Qu²,

Qiu³

et al. 2023

Mater. Res. Express

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Mercury (Hg) in seawater enters the body through the food chain, causing damage to organs and the nervous system. Thus, there is an urgent need to explore a rapid and convenient sensor for the detection and monitoring of Hg(II) in seawater. Herein, a ZnO-CNTs/Nano-Au modified glassy carbon electrode was prepared by the dropping method. The structure of the composite membrane is mainly observed by scanning electron microscopy (SEM), and the results show that the composite has a larger specific surface area. Moreover, the composite can increase the ion adsorption of the surface electrode and enhance the conductivity. Differential pulse voltammetry (DPV) was applied to determine trace amounts of Hg(II) in seawater. The optimized conditions were as follows: accumulation potential, accumulation time, pH value, film thickness and concentration. Under the optimal experimental conditions, the linear relationship between the values of the oxidation peak current and concentration was kept in the range of 1.49~5.97 μM, with a linear correlation coefficient R2=0.97443 and a detection limit of Hg(II) of 0.0156 μM. The proposed method was applied to the analysis of coastal water of the Maowei Sea, giving values of recovery in the range of 94.2%~98.4%. The ZnO-CNTs/Nano-Au-modified electrode has high sensitivity, convenient operation and good practical application value.

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“…The fabrication of fluorescent sensors relies on intramolecular processes such as photoinduced electron transfer (PET), and photoinduced charge transfer (PCT) or intermolecular processes, including the fluorescence resonance energy transfer (FRET), and inner filter effect (IFE); these intermolecular processes relate to energy transfer between at least two independent molecules [ 13 , 14 ]. In this study, we fabricated a GSH fluorescent sensor using a nitrogen and phosphorus co-doped carbon dot (NPCD)-MnO 2 nanocoral composite.…”

Section: Introductionmentioning

confidence: 99%

Glutathione Fluorescence Sensing Based on a Co-Doped Carbon Dot/Manganese Dioxide Nanocoral Composite

Le¹,

Lee²,

Tran³

2022

Materials

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Glutathione (GSH) is an antioxidant thiol that has a vital role in the pathogenesis of various human diseases such as cardiovascular disease and cancer. Hence, it is necessary to study effective methods of GSH evaluation. In our work, an effective GSH sensor based on a nitrogen and phosphorus co-doped carbon dot (NPCD)-MnO2 nanocoral composite was fabricated. In addition to utilizing the strong fluorescence of the NPCDs, we utilized the reductant ability of the NPCDs themselves to form MnO2 and then the NPCD-MnO2 nanocoral composite from MnO4−. The characteristics of the nanocoral composite were analyzed using various electron microscopy techniques and spectroscopic techniques. The overlap between the absorption spectrum of MnO2 and the fluorescence emission spectrum of the NPCDs led to effective fluorescence resonance energy transfer (FRET) in the nanocoral composite, causing a decrease in the fluorescent intensity of the NPCDs. A linear recovery of the fluorescent intensity of the NPCDs was observed with the GSH level raising from 20 to 250 µM. Moreover, our GSH sensor showed high specificity and sensing potential in real samples with acceptable results.

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Metal Nanostructures for Environmental Pollutant Detection Based on Fluorescence

Cited by 18 publications

References 121 publications

Luminol Doped Silica-Polymer Sensor for Portable Organic Amino Nitrogen and Ammonium Determination in Water

Luminol Doped Silica-Polymer Sensor for Portable Organic Amino Nitrogen and Ammonium Determination in Water

ZnO-CNT/Nano-Au modified electrodes for the detection of trace Hg(II) in coastal seawater

Glutathione Fluorescence Sensing Based on a Co-Doped Carbon Dot/Manganese Dioxide Nanocoral Composite

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