Highly sensitive and specific uranyl ion detection by a fluorescent sensor containing uranyl-specific recognition...

Area of Science:

• Environmental Science
• Analytical Chemistry
• Materials Science

Background:

• Uranium pollution poses significant risks to human health and ecosystems.
• Accurate detection of uranyl ions is vital for environmental safety.
• Existing detection methods may lack sensitivity or specificity.

Purpose of the Study:

• To develop a novel fluorescent sensor for sensitive and selective detection of uranyl ions.
• To investigate the sensing mechanism based on aggregation-induced emission (AIE) and intramolecular charge transfer (ICT).
• To evaluate the sensor's performance for environmental uranium contamination monitoring.

Main Methods:

• Synthesis of a novel fluorescent sensor TPE-EDC using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and 1,1,2,2-tetra(4-carboxylphenyl)ethylene (TPE-(COOH)4).
• Characterization of the sensor's fluorescent properties in aqueous environments, leveraging AIE and ICT effects.
• Quantification of uranyl ion concentration by measuring the fluorescence intensity reduction due to uranyl ion binding.

Main Results:

• The TPE-EDC sensor demonstrated significant fluorescence in aqueous solutions due to AIE and ICT effects.
• Uranyl ion binding caused a decrease in ICT, leading to reduced fluorescence intensity.
• An excellent linear relationship was observed between fluorescence attenuation and uranyl ion concentration.
• The sensor achieved an ultra-low detection limit of 69 pmol/L and a rapid response time of 30 seconds.

Conclusions:

• TPE-EDC is a highly sensitive and selective fluorescent sensor for uranyl ions.
• The sensor's performance makes it a promising tool for early warning of uranium pollution.
• This development contributes to advanced environmental monitoring techniques for toxic heavy metals.