Detection of Pb(II): Au Nanoparticle Incorporated CuBTC MOFs
Gajanan A. Bodkhe, Bhavna Hedau, Megha A. Deshmukh, Harshada K. Patil, Sumedh M. Shirsat, Devdatta M. Phase, K. K. Pandey, Mahendra D. Shirsat
Abstract
In the present investigation copper benzene tricarboxylate metal organic frameworks (CuBTC MOF) and Au nanoparticles incorporated CuBTC MOF (Au@CuBTC) was synthesized by conventional solvothermal method in round bottom flask at 105 oC kept in oil bath. The synthesized CuBTC MOF and Au@CuBTC MOFs were characterized by structural viz. X ray diffraction (XRD); spectroscopic methods viz. Fourier Transform Infrared spectroscopy, Raman Spectroscopy, X-ray Photoelectron Spectroscopy (XPS), Energy dispersive spectroscopy (EDS); morphological viz. Field emission scanning electron microscopy (FE-SEM); Electrochemical viz. cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS); thermal stability by thermogravimetric analysis (TG/DTA) and N2 adsorption – desorption isotherm by Brunauer-Emmett-Teller (BET) surface area method. Both the materials were tested for detection of lead (II) ions in aqueous media. Au nanoparticles incorporated CuBTC MOF shows great affinity, selectivity towards Pb2+ ions and achieved lower detection limit (LOD) of 1 nM/L by differential pulse voltammetry (DPV) technique which is far below the MCL for Pb2+ ions (0.03μM/L) as suggested by United States (U.S.) Environmental Protection Agency's (EPA) drinking water regulation.