کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5009149 | 1462043 | 2017 | 11 صفحه PDF | دانلود رایگان |
- New dual-mode chemosensor A3TA was developed for detection of Fe3+ and Hg2+.
- A3TA displayed off-on fluorescence detection of Fe3+ and Hg2+ based on CHEF.
- A3TA could selectively sense Hg2+ by color change from khaki to reddish brown.
- Sensor A3TA displayed high association constants and low DLs.
- Sensor A3TA has been used to quantify Fe3+ and Hg2+ in real water samples.
A novel oligothiophene-based dual-mode chemosensor A3TA was designed and synthesized for Fe3+ and Hg2+ in aqueous media. The sensor A3TA showed high selectivity and sensitivity toward Fe3+ and Hg2+ over other competitive metal ions. Hg2+ was detected by changing color from khaki to reddish brown, could be easily distinguished by bare eyes. Moreover, the sensor also acted as a “turn-on” type fluorescent sensor toward Fe3+ and Hg2+. The detection limits for Fe3+ and Hg2+ were found to be as low as 3.52Â ÃÂ 10â8 and 5.0Â ÃÂ 10â8Â M, respectively. The stoichiometric ratio of the sensor toward Fe3+/Hg2+ ions was obtained to be 1:2. Furthermore, the proposed sensor A3TA was also found to have high association constants (105Â Mâ2), wide pH range (4-12) and short response time (3-5Â min). In addtion, the sensing mechanism was proposed based on chelation-enhanced fluorescence (CHEF) and investigated in detail by fluorescence spectroscopy, 1H NMR titrations, FT-IR and HRMS spectra analysis. Importantly, the proposed sensor A3TA has been successfully used to quantify trace amounts of Fe3+ and Hg2+ in real samples.
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Journal: Sensors and Actuators B: Chemical - Volume 248, September 2017, Pages 24-34