Mercury ion (Hg2 +) is a heavy metal pollutant that can compromise water quality and harm human health. Therefore, the accurate detection of Hg2 + has become an important area of research. The development of a unique “OFF-ON” fluorescence detection technique for Hg2 + based on synthesized gold nanoparticles (GNP) is the subject of a recent study published in the journal Chemosphere.
Study: A new “OFF-ON” fluorescent detection strategy for Hg (II) in water based on functionalized gold nanoparticles. Image credit: BeataGFX / Shutterstock.com
Mercury ions (Hg2 +): a water pollutant and a major health concern
Exposure to heavy metals can have serious biological toxic effects, such as lead, arsenic, mercury and copper, and can be carcinogenic and dangerous to human health.
Mercury ions (Hg2 +) can cause serious health problems. Even tiny levels of mercury ions can induce serious disorders, such as brain damage and cognitive impairment.
The danger of mercury pollution for the stability of the aquatic ecosystem has become a serious problem that must be addressed immediately. Hg2 + penetrates and is rapidly deposited in many habitats, especially in aquatic environments and aquatic species, and can therefore easily accumulate in humans through food supply.
As a result, the introduction of a rapid and sensitive technique for identifying traces of Hg2 + in aquatic ecosystems is not only consistent with the notion of sustainable socio-economic growth, but is also critical to public welfare and environmental preservation.
Limitations of conventional Hg2 + detection methods
Atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), atomic fluorescence spectroscopy (AFS) and inductive coupled plasma emission spectroscopy (ICP-AES) are the techniques to evaluate and monitor mercury ions in water.
However, these methods require expensive equipment, can only be used in laboratories, and cannot be used for real-time or in-situ monitoring, making them unsuitable for the realistic detection of mercury ions (Hg2 +) in aquatic environments.
Fluorescent sensors: the future of Hg2 + detection technology
Electrolytic and fluorescent detectors have gained popularity due to their many benefits: low cost, ease of processing, environmentally friendly and remarkable real-time detection features.
Fluorescence sensors, unlike AFS, usually detect and recognize objects by increasing the fluorescence or turning off the detector itself. In contrast, AFS detects the fluorescence emission levels created by the atomic vaporization of the target object under stimulation of radiant radiation.
To enhance the functional characteristics of these sensors, typical fluorescence detection systems are often constructed with materials such as nanomaterials, fluorescent nanocrystals, quantum dots, and sustainably grown fluorescent dyes.
Gold nanoparticles (GNP) for the manufacture of fluorescent sensors
Nanomaterials have shown exceptional promise for fluorescent detection, drug delivery, biomedical imaging, and other domains. Gold nanoparticles (PNBs) are distinguished from other nanomaterials by their different qualities, such as durability, surface texture, conduction, optical properties, and water solubility.
PNBs can be made using easy, environmentally friendly procedures, and the size and shape of PNB particles can be modified using various approaches to alter photoelectric properties. Because of these properties, GNPs can be mixed with a number of ligands to build a particular detection substrate to identify multiple harmful objects.
A new “OFF-ON” fluorescence detection strategy for Hg2 +
In this study, researchers created a new “OFF-ON” detection technique for the sensitive and selective identification of Hg2 +. This was determined by the distinctive optical properties of GNPs and the principle of fluorescence of an organic dye called a derivative of rhodamine 6G (Rh6G2).
GNP and Rh6G2 were linked by the self-assembly approach and the Schiff base process by the sulfhydryl and amino groups. The suggested detection approach was applied to detect mercury ions in real water samples to further investigate their practical applicability.
Important results of the study and future perspective
Various characterization techniques indicated that the suggested Hg2 + detection technology had high dispersion, restricted size variation, and exceptional fluorescence characteristics. The active molecules at the interface play a role in the stability of GNPs in a complex environment and provide a specialized pathway for catalytic degradation of the target.
When the detection technique was used to detect Hg2 + in various complex water environments, the results were satisfactory, with average recoveries ranging from 93.4 to 103.0 percent.
More environmentally friendly materials, improved biocompatibility, a higher detection limit and more accurate detection capability are limitations that need to be addressed in the long run. In conclusion, the detection system created is likely to pave the way for new applications, such as biological imaging and fluorescence visualization technologies, and has a high potential for detecting mercury in a variety of situations.
Reference
Li, G. et al. (2022). A new “OFF-ON” fluorescent detection strategy for Hg (II) in water based on functionalized gold nanoparticles. Chemosphere. Available at: https://www.sciencedirect.com/science/article/pii/S0045653522016678?via%3Dihub
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