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ACS Sens. 2018 Aug 24;3(8):1569-1575. doi: 10.1021/acssensors.8b00388. Epub 2018 Jul 31.

Fast and Selective Detection of Cr(III) in Environmental Water Samples Using Phosphovanadate Y(V0.2P0.8O4):Eu3+ Fluorescence Nanorods.

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Engineering Technology Research Center for Environmental Protection Materials and Equipment of Jiangxi Province, Jiangxi Key Laboratory of Industrial Ceramics , Pingxiang University , Pingxiang 337055 , China.
College of Chemistry , Nanchang University , Nanchang 330031 , China.


Phosphovanadate Y(V0.2P0.8O4):Eu3+ nanorods have been created via a simple hydrothermal method and used for the highly sensitive and selective fluorescence detection of Cr3+ over other common heavy metal ions within a 10 min period. It was found that the fluorescence intensity of Y(V0.2P0.8O4):Eu3+ linearly decreases with Cr3+ concentrations ranging from 1 × 10-9 to 1.2 × 10-6 M. The sensing mechanism for Cr3+ is ascribed to the aggregation of Y(V0.2P0.8O4):Eu3+ nanorods triggered by Cr3+ ions owing to the high affinity of phosphate groups to metal ions. The excellent chemical stability, photostability over a wide pH range of 3-12, and high salt-tolerance performance with ionic strength from 1× 10-3 to 12 M of Y(V0.2P0.8O4):Eu3+ allow these nanorods to successfully overcome the photobleaching and pH-dependent fluorescence property of traditional organic fluorescence probes. These characteristics ensure their applicability to environmental monitoring of Cr3+. The sensitive determination of Cr3+ in different environmental water samples demonstrated the potential application of Y(V0.2P0.8O4):Eu3+ as a practical environmental probe. With the help of a UV lamp (254 nm), the visual Cr3+ values for dynamic monitoring in industrial wastewater further verified that this method can even exhibit on-site visible features in daytime and night easily. This allows for the direct monitoring of environmental Cr3+.


Cr3+; fluorescence; heavy metal ions; phosphovanadate; visual; wastewater


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