Abstract
The nanozyme-based colorimetric strategy for heavy metal detection has broad application prospects nowadays. However, the inefficient recognition capabilities of nanozyme sensors for targets hinder its further application. Herein, the authors synthesize bare nickel selenide (NiSe2) via a one-step hydrothermal reaction, in which the Se element possesses a strong binding ability with mercury (Hg). As expected, NiSe2 exhibits oxidase-like activity in the presence of Hg2+, that is, Hg2+ can enhance the oxidase-like activity of NiSe2. The enhanced mechanism is the accelerated electron transfer between NiSe2–Hg2+ and substrate caused by the formation of Hg–Se bonds. Besides, the oxidase-like activity of NiSe2 exhibits excellent selectivity, sensitivity and stability in response to Hg2+, which enables NiSe2–Hg2+ to efficiently oxidize colorless TMB to blue TMB even in harsh environments. Based on this, a dual-mode colorimetric sensor integrating solution reaction and test paper is developed for the detection of Hg2+. In the Hg2+ concentration range of 10–700 nM, the colorimetric platform presents a liner response to Hg2+, which can reach a low LOD of 5.18 nM in solution reaction and 8.42 nM in the test paper. The proposed strategy can also be applied to real water samples with good recovery and excellent self-calibration capability.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
