Preparation and Application of Bismuth/MXene Nano-Composite as Electrochemical Sensor for Heavy Metal Ions Detection.

A nano-form composite of MXenes (TiCT, T = -O, -OH, -F) was synthesized through depositing bismuth-nanoparticle (BiNPs) onto TiCT sheets. Because of the preventive effect of the two-dimensional layered structure of TiCT, the nanoparticles of Bi were uniform and well attached on the TiCT. The obtained BiNPs/TiCT nano-composite was applied for sensors construction of electrochemical detecting of Pb and Cd heavy metal ions. The produced BiNPs@TiCT-based sensor showed high effective surface area and excellent conductivity. Also, the BiNPs were efficient for anodic-stripping voltammetric to detect heavy metal ions. After conditions optimization, the BiNPs@TiCT nano-sensor could detect Pb and Cd simultaneously and the detection limits were 10.8 nM for Pb and 12.4 nM for Cd. The BiNPs@TiCT was promising for detecting heavy metal ions due to their high surface area, fast electron-transfer ability, environmental friendliness, and facial preparation.