Highly sensitive detection of Cr(vi) in groundwater by bimetallic NiFe nanoparticles

Abstract

Hexavalent chromium (Cr(VI)) is one of the most toxic heavy metal pollutants in groundwater, and thus the detection of Cr(VI) with high sensitivity, accuracy, and simplicity and low cost is of great importance. In this work, cheap bimetallic NiFe nanoparticles were synthesized and used for the electrochemical detection of Cr(VI). The reduction potential of Cr(VI) was negatively shifted to 0.00 V, and a wide linear concentration range for Cr(VI) from 0.025 to 98.3 μM with a detection limit of 0.01 μM was obtained. The results demonstrate that the NiFe nanoparticles have excellent sensing capability for Cr(VI). Their fast response and high reproducibility and stability, as well as great promise for the quantification of Cr(VI) in real samples, make the NiFe-based bimetallic catalysts promising candidates for sensing Cr(VI) in groundwater.