Fabrication of MOF@MXene Based Electrochemical Sensor for Sensitive Detection of Environmental Pollutant

Abstract

Heavy metallic ions (HMIs) are some of the riskiest environmental pollutants because they're non-biodegradable, very poisonous, and have the tendency to bioaccumulate in residing organisms. Their incidence in water supplies is an extreme risk to human fitness and ecosystems. (Bi-S)n MOF@MXene composite was synthesized for sensitive detection of HMIs in aqueous media. The (Bi-S)n MOF was prepared through a microwave method using bismuth nitrate pentahydrate and 6,6-dithiodinicotinic acid. Using a combination of LiF and HCl, the aluminum layer from the MAX phase was selectively etched to create MXene. (Bi-S)n MOF and MXene were acquired to prepare a hybrid composite, which were solidified on a GCE. The conductivity, adsorption capacity, and sensing range of MOF were all enhanced by MXene. FTIR, XRD, CV, and EIS characterization approaches validated the structural integrity and excellent electrochemical behavior of the composite. The sensor indicated extremely excessive sensitivity with detection limits (LODs) of 1.9233 nM, 2.0927 nM and 2.2104 nM for Pb²⁺ Cu²⁺ and Hg²⁺ in single detection. During co-detection, modest LOD expanded of Pb²⁺, Cu²⁺and Hg²⁺ have been noticed due to competition among the ions.