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Carbon dots based dual-emission silica nanoparticles as ratiometric fluorescent probe for chromium speciation analysis in water samples

Xiang, Guoqiang ; Ren, Yue ; Zhang, Heng ; Fan, Huanhuan ; Jiang, Xiuming ; He, Lijun ; Zhao, Wenjie

Canadian journal of chemistry, 2018, Vol.96 (1), p.72-77 [Periódico revisado por pares]

Ottawa: NRC Research Press

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Título:
Carbon dots based dual-emission silica nanoparticles as ratiometric fluorescent probe for chromium speciation analysis in water samples
Autor: Xiang, Guoqiang ; Ren, Yue ; Zhang, Heng ; Fan, Huanhuan ; Jiang, Xiuming ; He, Lijun ; Zhao, Wenjie
Assuntos: Acetic acid ; analyse de spéciation ; analyse d’échantillons d’eau ; Carbon ; Carbon dots ; Chemical properties ; Chemistry ; Chromium ; Chromium (Metal) ; Control ; Cr(VI) ; Emission analysis ; Emissions ; Environmental aspects ; Extinction ; Fluorescence ; Fluorescent indicators ; Investigations ; Linearity ; Measurement ; Methods ; Nanoparticles ; nanoparticules de silice ; Organic acids ; Oxidation ; Potassium ; Potassium bromate ; Quality control ; ratiometric fluorescent probe ; Sensors ; Silica ; silica nanoparticles ; Silicon dioxide ; sonde fluorescente ratiométrique ; Speciation ; speciation analysis ; Studies ; Trivalent chromium ; Water ; Water analysis ; Water quality ; water samples analysis ; Water sampling
É parte de: Canadian journal of chemistry, 2018, Vol.96 (1), p.72-77
Descrição: A simple and effective strategy for designing a ratiometric fluorescent nanosensor was described. A carbon dots (CDs) based dual-emission nanosensor for chromium speciation analysis was developed by coating CDs on the surface of dye-doped silica nanoparticles. The fluorescence of the resulting dual-emission silica nanoparticles was quenched in acetic acid through potassium bromate (KBrO 3 ) oxidation. Cr(VI) was able to catalyze KBrO 3 oxidation, resulting in ratiometric fluorescence accelerated quenching response of the dual-emission silica nanoparticles. Several important parameters affecting the nanosensor performance, including acid type, concentrations of KBrO 3 , and reaction temperature and time were examined. Under the optimized conditions, the detection limit of the nanosensor towards Cr(VI) reached 1.3 ng mL −1 , and pretty good linearity was obtained between 20 to 500 ng mL −1 . More importantly, the sensor was found suitable for speciation analysis of both Cr(III) and Cr(VI) in different water samples with satisfactory results.
Editor: Ottawa: NRC Research Press
Idioma: Inglês

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Carbon dots based dual-emission silica nanoparticles as ratiometric fluorescent probe for chromium speciation analysis in water samples

Xiang, Guoqiang ; Ren, Yue ; Zhang, Heng ; Fan, Huanhuan ; Jiang, Xiuming ; He, Lijun ; Zhao, Wenjie

Ottawa: NRC Research Press

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