Journal
ANALYTICA CHIMICA ACTA
Volume 1119, Issue -, Pages 11-17Publisher
ELSEVIER
DOI: 10.1016/j.aca.2020.04.049
Keywords
Photoelectrochemical sensors; Schottky heterojunction; BiVO4/Ti3C2TX sensor; Hg2+ detection
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Funding
- self-determined research funds of CCNU from the colleges' basic research and operation of MOE [CCNU18JCXK07]
- Program of Introducing Talents of Discipline to Universities of China (111 program) [B17019]
- Recruitment Program of Global Youth Experts of China
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A highly sensitive photoelectrochemical (PEC) sensing platform was constructed for Hg2+ determination based on the Schottky heterojunction between an emerging 2D material Ti3C2TX MXene and a promising semiconductor material BiVO4. Through simply spin-coating the single-layer Ti3C2TX onto the surface of BiVO4 film, the modified electrode exhibited significantly enhanced PEC activity. However, the boost in photocurrent could be noticeably suppressed due to the consumption of hole-scavenging agents (reduced glutathione) by the added Hg2+. Owing to the selective decrease in the photocurrent with the addition of Hg2+, the PEC sensor based on BiVO4/Ti3C2TX displayed a wide linear range from 1 pM to 2 nM with the limit of detection down to 1 pM. Moreover, the PEC sensor also exhibited satisfactory accuracy and repeatability in practical sample water, the Yangtze River water, demonstrating the great potential for monitoring heavy metal ions in natural water resources. (C) 2020 Elsevier B.V. All rights reserved.
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