Mxene/carbon nanohorn/β-cyclodextrin-Metal-organic frameworks as high-performance electrochemical sensing platform for sensitive detection of carbendazim pesticide.

A novel electrochemical sensor for the detection of carbendazim was designed based on MXene/CNHs/β-CD-MOFs electrode. • MXene/CNHs was synthesized via electrostatic self-assembly strategy. • MXene/CNHs showed high specific surface area, conductivity and abundant active sites. • β-CD-MOF has the properties of host-guest system of β-CD and porous structure of MOF. • The MXene/CNHs/β-CD-MOF composite was applied to electrochemically detect CBZ. • The sensor demonstrated high sensitivity with a low detection limit of 1.0 nM. Pesticides play an important role in agricultural fields, but the pesticide residues pose strong hazardous to human health, thus designing sensitive and fast method for pesticides monitor is highly urgent. Herein, nanoarchitecture of Mxene/carbon nanohorns/β-cyclodextrin-Metal-organic frameworks (MXene/CNHs/β-CD-MOFs) was exploited as electrochemical sensing platform for carbendazim (CBZ) pesticide determination. β-CD-MOFs combined the properties of host-guest recognition of β-CD and porous structure, high porosity and pore volume of MOFs, enabling high adsorption capacity for CBZ. MXene/CNHs possessed large specific surface area, plenty of available active sites, high conductivity, which afforded more mass transport channels and enhances the mass transfer capacity and catalysis for CBZ. With the synergistic effect of MXene/CNHs and β-CD-MOFs, the MXene/CNHs/β-CD-MOFs electrode extended a wide linear range from 3.0 nM to 10.0 μM and a low limit of detection (LOD) of 1.0 nM (S/N = 3). Additionally, the prepared sensor also demonstrated high selectivity, reproducibility and long-term stability, and satisfactory applicability in tomato samples. [ABSTRACT FROM AUTHOR]