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A highly sensitive photoelectrochemical (PEC) sensing platform was constructed for Hg 2+ determination based on the Schottky heterojunction between an emerging 2D material Ti 3 C 2 T X MXene and a promising semiconductor material BiVO 4 . Through simply spin-coating the single-layer Ti 3 C 2 T X onto the surface of BiVO 4 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 Hg 2+ . Owing to the selective decrease in the photocurrent with the addition of Hg 2+ , the PEC sensor based on BiVO 4 /Ti 3 C 2 T X 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., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier B.V. All rights reserved.)