A Simple Colorimetric Probe for Sensitive Detection of Hg²⁺ Based on MnO₂ Nanosheets and Monothioglycerol

Abstract

It is of great significance to develop efficient platforms for the detection of hypertoxic Hg 2 +. Colorimetric probes have received much attention for the detection of Hg 2 + in the last decades. In this work, a colorimetric probe composed of MnO 2 nanosheets and monothioglycerol (MTG) was rationally designed for Hg 2 + detection, which was facially prepared via onestep reaction at room temperature. The formation of HgÀ S bond between Hg 2 + and MTG inhibited the decomposition ability of MTG toward MnO 2 nanosheets, thus resulting in a color change from colorless to brown. On this basis, the probe quantified Hg 2 + in the concentration range from 2 to 60 μM with a low detection limit of 0.75 μM. The probe was applied to the detection of Hg 2 + in tap water successfully, and was further fabricated into test strips for the convenience of use. Thereby, a simple and sensitive colorimetric probe for Hg 2 + is developed in this work, which holds future promise for monitoring Hg 2 + in the environment.

Porous Ag-Chitosan Nanospheres Bridged by Cysteine Residues for Colorimetric Sensing of Trace Hg2+

“…The Hg 2+ contents obtained from the proposed AgNPs-cys-CS system agree well with those from our previous reports that used fluorescent or electrochemical sensors. , Importantly, the detection limit or linear range is better than those from other nanomaterial-based sensors reported previously (Table ). ,,,− The AgNPs-cys-CS from the present study is an efficient sensor for Hg 2+ detection with excellent reliability and practicality.…”

Colorimetric and Photocurrent-Polarity-Switching Photoelectrochemical Dual-Mode Sensing Platform for Highly Selective Detection of Mercury Ions Based on the Split G-Quadruplex–Hemin Complex

“…In order to overcome these shortcomings, several methods with low cost including colorimetric, electrochemical, and photoelectrochemical (PEC) techniques were developed for the detection of Hg 2+ . − Thereinto, PEC method has received much attention with many advantages including low background signal, easy operation, miniaturization, and so forth. − However, the current PEC methods for detecting mercury ions are still limited because many excellent photoactive materials (such as CoSx@CdS, ZnS@Ag 2 S, CdS, etc − which results in false-negative or false-positive results.…”