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...

Full description

Saved in:
Bibliographic Details
Published inSensors and actuators. B, Chemical Vol. 305; p. 127449
Main Authors Li, Mengyin, Zhang, Guangxue, Feng, Chuanqi, Wu, Huimin, Mei, He
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.02.2020
Elsevier Science Ltd
Subjects
Chromium
Detection
Electromagnetic absorption
Electron recombination
Heterojunctions
Heterostructure
Heterostructures
Hexavalent chromium
Morphology
Photoelectrochemical
Photoluminescence
Surface plasmon resonance
Ultraviolet reflection
Ultraviolet spectra
Heterostructure
Hexavalent chromium
Surface plasmon resonance
Detection
Photoelectrochemical
Online AccessGet full text

Cover

More Information
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.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2019.127449