Smart app-based on-field colorimetric quantification of mercury via analyte-induced enhancement of the photocatalytic activity of TiO2–Au nanospheres

Smart app-based on-field colorimetric quantification of mercury via analyte-induced enhancement... We have devised a unique strategy for highly sensitive, selective, and colorimetric detection of mercury based on analyte-induced enhancement of the photocatalytic activity of TiO –Au nanospheres (TiO –Au NSs) toward degradation of methylene blue 2 2 (MB). Through electrostatic interactions, Au nanoparticles are attached to poly-(sodium 4-styreneulfonate)/ poly(diallyldimethylammonium chloride) modified TiO nanoparticles, which then form an Au shell on each TiO core through 2 2 3+ 2+ + reduction of Au with ascorbic acid. Notably, the deposition of Hg species (Hg /CH Hg )onto TiO –Au NSs through strong 3 2 Au–Hg aurophilic interactions speeds up catalytic degradation of MB. The first-order degradation rates of MB by TiO –Au NSs −2 −1 −2 −1 and TiO –Au–Hg NSs are 1.4 × 10 min and 2.1 × 10 min , respectively. Using a commercial absorption spectrometer, the 2 2+ TiO –Au NSs/MB approach provides linearity (R = 0.98) for Hg over a concentration range of 10.0 to 100.0 nM, with a limit of detection (LOD) of 1.5 nM. On the other hand, using a low-cost smartphone app that records the color changes (ΔRGB) of MB solution based on the red–blue–green (RGB) component values, the TiO –Au NSs/MB approach provides http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Analytical and Bioanalytical Chemistry Springer Journals

Smart app-based on-field colorimetric quantification of mercury via analyte-induced enhancement of the photocatalytic activity of TiO2–Au nanospheres

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2018 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Chemistry; Analytical Chemistry; Biochemistry, general; Laboratory Medicine; Characterization and Evaluation of Materials; Food Science; Monitoring/Environmental Analysis
ISSN
1618-2642
eISSN
1618-2650
D.O.I.
10.1007/s00216-018-1114-7
Publisher site
See Article on Publisher Site

Abstract

We have devised a unique strategy for highly sensitive, selective, and colorimetric detection of mercury based on analyte-induced enhancement of the photocatalytic activity of TiO –Au nanospheres (TiO –Au NSs) toward degradation of methylene blue 2 2 (MB). Through electrostatic interactions, Au nanoparticles are attached to poly-(sodium 4-styreneulfonate)/ poly(diallyldimethylammonium chloride) modified TiO nanoparticles, which then form an Au shell on each TiO core through 2 2 3+ 2+ + reduction of Au with ascorbic acid. Notably, the deposition of Hg species (Hg /CH Hg )onto TiO –Au NSs through strong 3 2 Au–Hg aurophilic interactions speeds up catalytic degradation of MB. The first-order degradation rates of MB by TiO –Au NSs −2 −1 −2 −1 and TiO –Au–Hg NSs are 1.4 × 10 min and 2.1 × 10 min , respectively. Using a commercial absorption spectrometer, the 2 2+ TiO –Au NSs/MB approach provides linearity (R = 0.98) for Hg over a concentration range of 10.0 to 100.0 nM, with a limit of detection (LOD) of 1.5 nM. On the other hand, using a low-cost smartphone app that records the color changes (ΔRGB) of MB solution based on the red–blue–green (RGB) component values, the TiO –Au NSs/MB approach provides

Journal

Analytical and Bioanalytical ChemistrySpringer Journals

Published: Jun 4, 2018

References

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