Sensitive, selective and simultaneous electrochemical detection of multiple heavy metals in environment and food using a lowcost FeO nanoparticles/fluorinated multi-walled carbon nanotubes sensor.

Multiple heavy metals pollution in environment and food has become an ever-increasing concern and poses a serious threat towards humans and animals. To broad the multiple heavy metals detection, FeO nanoparticles, FeO/multi-walled carbon nanotubes (FeO/MWCNTs) and FeO/fluorinated multi-walled carbon nanotubes (FeO/F-MWCNTs) nanocomposites were synthesized by hydrothermal method and constructed as a simultaneous electrochemical sensor, respectively. Compared the catalytic performances of the three electrochemical sensors for the simultaneous detection of Cd, Pb, Cu, and Hg, the results showed that the FeO/F-MWCNTs sensor demonstrated preponderant performance. It showed the sensitivity of 108.79, 125.91, 160.85, and 312.65 μA mM cm toward Cd, Pb, Cu, and Hg, respectively, which was obviously higher than that of FeO/MWCNTs and FeO. Additionally, the FeO/F-MWCNTs sensor exhibited the wider linear detection ranges of 0.5-30.0, 0.5-30.0, 0.5-30.0, and 0.5-20.0 μM for Cd, Pb, Cu, and Hg, respectively. The limit of detections of the FeO/F-MWCNTs sensor were 0.05, 0.08, 0.02, and 0.05 nM (signal to noise ratio of 3) for Cd, Pb, Cu, and Hg, respectively, fulfilling the governmental requests of the World Health Organization, China and Indian. The excellent agreement was recorded between the lowcost FeO/F-MWCNTs sensor and typical methods (inductively coupled plasma mass spectrometry or atomic fluorescence spectrometry) in river water and soybean samples. Additionally, the sensor also exhibited excellent performances in selectivity, recovery, stability, and reproducibility. This proposal sensor provides a promising strategy to monitor multiple targets in the environment and food.