Journal
ANALYTICAL METHODS
Volume 14, Issue 12, Pages 1239-1245Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ay00151a
Keywords
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Funding
- National Natural Science Foundation of China [21804050]
- Natural Science Foundation of Fujian Province of China [2019J05098, 2020J05201]
- Longyan University Scientific Research Fund for the Doctoral Young Scholars [LB2020007]
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This study demonstrates a colorimetric approach for the detection of hydrogen sulfide in water samples with high sensitivity. A practical portable device for on-site detection was designed, and a simple colorimetric method based on a smartphone was developed.
In this study, we demonstrate a colorimetric approach for the detection of hydrogen sulfide (H2S) in water samples with high sensitivity. Firstly, copper-metal-organic frameworks (Cu-MOFs) were synthesized by ultrasonic-assisted hydrothermal method, presenting a maximum absorption peak at 700 nm. It was found that Cu-MOFs could react with H2S to form a copper-sulfur complex along with a decrease of the absorption peak at 700 nm and a visible color change from blue to tan. Under the optimal reaction conditions, the absorption intensity at 700 nm was linear with H2S concentration in a range of 0.05-2 mM (R-2 = 0.9928), providing a detection limit of 22 mu M. Furthermore, the method was successfully applied to the detection of H2S in lake water samples with a recovery rate between 94.4% and 112.6%. In addition, a practical and portable device for on-site H2S detection was designed by using agarose hydrogels, and a simple colorimetric detection method based on a smartphone was developed. This analytical method showed good selectivity for H2S compared to other interfering substances, and the feasibility of the agarose hydrogel-based device was proved by the determination of H2S in real lake water samples.
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