Fluorescence quenching studies of CTAB stabilized perylene nanoparticles for the determination of Cr(VI) from environmental samples: spectroscopic approach

摘要

Cetyl trimethyl ammonium bromide (CTAB) stabilized perylene nanoparticles (PNPs) were prepared by a modified reprecipitation method in aqueous solution under ultrasonic treatment. A spectrofluorimetric method for the quantitative determination of hexavalent chromium (Cr(VI), dichromate species) based on the fluorescence (FL) quenching of CTAB-stabilized PNPs (CTAB-PNPs) in aqueous solution was proposed. Under the most favourable conditions, the FL intensity of PNPs monitored at an excitation wavelength of λ_(ex) = 382 nm was quenched by the successive addition of increasing concentrations of dichromate ions. The FL quenching results were found to fit the Stem-Volmer (S-V) relationship in the range of 0.5-50 μg mL~(-1) with a correlation coefficient of 0.9997. The limit of detection (LOD) was 0.008 μg mL~(-1). The method based on FL quenching was successfully applied for the quantitative analysis of Cr(VI) in water samples collected from different environments.