Highly sensitive detection of chromium (VI) by photoelectrochemical sensor under visible light based on Bi SPR-promoted BiPO4/BiOI heterojunction
•Bi surface plasmon resonance (SPR)-promoted BiPO4/BiOI is synthesized by hydrothermal method.•The Bi-BiPO4/BiOI composites have excellent PEC performance.•The PEC sensor shows outstanding performances for hexavalent chromium detection. In this work, Bi surface plasmon resonance (SPR)-promoted BiPO4...
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Published in | Sensors and actuators. B, Chemical Vol. 305; p. 127449 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
15.02.2020
Elsevier Science Ltd |
Subjects | |
Online Access | Get full text |
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Summary: | •Bi surface plasmon resonance (SPR)-promoted BiPO4/BiOI is synthesized by hydrothermal method.•The Bi-BiPO4/BiOI composites have excellent PEC performance.•The PEC sensor shows outstanding performances for hexavalent chromium detection.
In this work, Bi surface plasmon resonance (SPR)-promoted BiPO4/BiOI heterostructures (Bi-BPI) are synthesized through a one-step hydrothermal method. The structure and morphology have been measured by a series of physical characterizations. Furthermore, the photoelectrochemical (PEC) experiments show that the PEC properties of BiPO4/BiOI are higher than those of pure BiPO4 and BiOI, while BiPO4/BiOI-6 % has the best PEC performance. At the same time, it is found that Bi metal could improve the PEC properties of BiPO4/BiOI-6 %, and that 0.05-Bi-BiPO4/BiOI-6 % has the highest performance among all materials. Ultraviolet-visible diffuse reflection spectra (DRS) and photoluminescence (PL) also prove that 0.05-Bi-BiPO4/BiOI-6 % features excellent visible light absorption and a lower electron recombination rate than the other composites. Therefore, PEC sensors based on 0.05-Bi-BiPO4/BiOI-6 % have been fabricated for the detection of hexavalent chromium (Cr (VI)). They exhibit a wide linear range from 0.5–180 μM with high stability for sensing Cr (VI). Thus, the PEC sensor has a great potential application in Cr (VI) detection. |
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ISSN: | 0925-4005 1873-3077 |
DOI: | 10.1016/j.snb.2019.127449 |