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Selective recognition of Cr (VI) ion as Cr 2 O 7 2− in aqueous medium using CTAB‐capped anthracene‐based nanosensor: Application to real water sample analysis
Author(s) -
Suryawanshi Sonali B.,
Mahajan Prasad G.,
Kolekar Govind B.,
Bodake Anita J.,
Patil Shivajirao R.
Publication year - 2019
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.3923
Subject(s) - chemistry , detection limit , fluorescence , aqueous solution , analytical chemistry (journal) , anthracene , quenching (fluorescence) , nanoparticle , titration , ammonium bromide , inorganic chemistry , nuclear chemistry , pulmonary surfactant , nanotechnology , photochemistry , chromatography , materials science , biochemistry , physics , quantum mechanics
Surfactant‐capped nanoparticles of 9, 10‐diphenyl anthracene prepared by reprecipitation method found highly fluorescent due to aggregation‐induced enhanced emission (AIEE). Cetyltrimethyl ammonium bromide (CTAB) surfactant not only generated positive zeta potential on the surface of nanoparticles to attract anions of interest but also stabilized nanoparticles into brick‐shape morphology. The fluorescence of nanoparticles is quenched by Cr 2 O 7 2‐ ion very significantly in comparison with other diverse ions, namely, MnO 4 ‐ , S 2 O 8 2‐ , HCO 3 ‐ , and Cr 2 O 4 2‐ . Though S 2‐ and IO 3 ‐ showed increase in the fluorescence of nanoparticles, the interference found is negligible in the Cr (VI) analysis. The selectivity and sensitivity of nanoparticles for recognition of Cr 2 O 7 2− were explored by systematic fluorescence titration. The fluorescence quenching data fits into the usual Stern‐Volmer equation. A calibration curve constructed by plotting quenching of fluorescence (∆F) against concentration of Cr (VI) exhibiting a linear fit in the equation, ∆F = 3070x, is used for the estimation of chromium concentration (x). The correlation coefficient value R 2 = 0.998 obtained from curve is nearly equal to 1 indicates linear fit between quenching data and concentration of Cr (VI). The estimated values of limit of detection (LOD) in the method 0.01392 μg.mL −1 is far below the permissible value of Cr (VI) 0.05 μg.mL −1 in drinking water approved by world health organization (WHO) and United State Environmental Protection Agency (USEPA). The proposed method of Cr (VI) detection is applied for real sample collected from hard chrome deposition industry from nearby region. The amount of Cr (VI) estimated by present method is comparable with AAS determination for the same samples.