The potential of hierarchically porous calcium oxide (HrÀ CaO) as a destructive adsorbent for organophosphate pesticides has been explored in this work. HrÀ CaO has been synthesized via an environment friendly precipitation method using water/ glycerol as the solvent system and gelatin as a template. Asprepared CaO exhibits a hierarchically porous structure with a high surface area of 74.8 m 2 g À 1 . The adsorption of phosmet on HrÀ CaO obeys pseudo-second order kinetics and is described well by the Langmuir adsorption isotherm model. Thermodynamic studies further explain the adsorption process to be exothermic and spontaneous. Fourier transform infrared (FTIR), Scanning electron microscopy (SEM) and Xray diffraction (XRD) analysis of HrÀ CaO after phosmet adsorption and the fragmentation pattern of phosmet obtained through mass spectrometric studies suggest chemical interaction of phosmet with HrÀ CaO. Density functional theory (DFT) studies further confirm highly exothermic destructive phosmet adsorption and degradation products matching the peaks obtained in the mass spectrum.
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