Abstract
Thallium as a highly dispersed and toxic heavy metal element, is distributed in soil and water due to a result of industrial activities. Thallium is extremely accumulative, which not only makes it harmful to the environment, but also enriches in living organisms and eventually poses a serious threat to human health. In order to detect thallium ions in water quickly and effectively, a PB@AuNPs nano-colorimetric probe based on gold nanoparticles coated with soluble prussian blue was proposed and characterized by UV–visible photometer, dynamic light scattering particle size distribution, Fourier transform infrared spectroscopy and X-ray diffraction. When Tl+ ions were present in the test sample, PB@AuNPs tended to adsorb Tl+ in the system and agglomerated, which exhibited a remarkable color change from wine red to blue. Meanwhile, the intensity and displacement of surface plasmon resonance (SPR) absorption peak changed. PB@AuNPs nanoprobe exhibited a 0.67 μM of limit of detection (LOD) for UV–vis spectra under the optimal pH being 6 with a good linear relationship between the absorbance ratios and the concentrations of Tl+ ions in the range of 10.0 ∼ 30.0 μM, y = 0.04239 x − 0.07483, R2 = 0.99137. The results showed that PB@AuNPs nanoprobe had high selectivity and good anti-interference, which could be used in the detection of actual water samples.
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