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Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study
Author(s) -
Nagpal Mudita,
Kakkar Rita
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201904740
Subject(s) - adsorption , chemical engineering , materials science , fourier transform infrared spectroscopy , exothermic reaction , porosity , scanning electron microscope , oxide , chemistry , organic chemistry , metallurgy , composite material , engineering
Abstract The potential of hierarchically porous calcium oxide (Hr−CaO) as a destructive adsorbent for organophosphate pesticides has been explored in this work. Hr−CaO has been synthesized via an environment friendly precipitation method using water/ glycerol as the solvent system and gelatin as a template. As‐prepared CaO exhibits a hierarchically porous structure with a high surface area of 74.8 m 2 g −1 . The adsorption of phosmet on Hr−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 Hr−CaO after phosmet adsorption and the fragmentation pattern of phosmet obtained through mass spectrometric studies suggest chemical interaction of phosmet with Hr−CaO. Density functional theory (DFT) studies further confirm highly exothermic destructive phosmet adsorption and degradation products matching the peaks obtained in the mass spectrum.