Abstract
The capacity of organically modified Montmorillonite (MMT) clay to adsorb nonpolar organic compound (benzene) in an aqueous solution, was investigated under the batch process. MMT was pretreated (centrifuged) and then functionalized with green intercalating agent i.e. 1-hexyl-3-methyl imadazolium chloride [HMim][Cl]. The characterization through Fourir Transoform Infrared Spectroscopy (FTIR), Differential Scanning Calorimeter (DSC) and Field Emission Scanning Electron Microscope (FE-SEM) confirmed the presence of the oxygen containing functional groups, changes in melting point and variation in the morphological properties. The governing parameters for the sorption of benzene such as the effect of contact time, pH, adsorbent dose and rotation were studied. The kinetic data conformed to pseuodo 2ndorder kinetic model and the isotherm experimental data were a better fit to Langmuir model with maximum adsorption capacity of 588.23mg/g under experimental conditions. Overall, MMT intercalated with 1-hexyl-3-methyl imadazolium chloride is a promising environmental friendly adsorbent for the abatement of benzene in an aqueous solution.
Highlights
In the last few years, the application of energy and power sources has been increased in the world
Fourir Transoform Infrared Spectroscopy (FTIR) analysis of MMT before and after the modification was performed to identify the functional groups over the surface of clay in confirms the presence of oxygen containing functional groups at 3200 cm-1, 3000 cm-1, C-H stretch at 2892 cm-1, C=C stretching vibration at 1550 cm-1, 1440cm-1 that can not be found in Pure MMT
The thermal behavior of MMT before and after the surface modification is measured by Differential Scanning Calorimeter (DSC) Q2000 V24.11 build 124, with a heating and cooling ramp of 10 K/min from 0oC to 300oC under nitrogen flow and the values were recorded during the second heating scan
Summary
In the last few years, the application of energy and power sources has been increased in the world. Clay adsorbent with large electron donor/acceptor group tends to remove the hazardous material by partitioning as the big structures occupy a large number of active sites of the interlamellar spaces of the clay [18] It was approved by Jaynes et al (1999) in which they concluded that SWy-TMA and SWy-Adam (small groups) removed benzene through partitioning process while SWyHDTMA (bulky group) followed the surface adsorption path [19].Since the ordered structure with large molecular weight lead towards higher sorption capacity. While working with bentonite clays, Bertagnolli et al (2012) deduced that organophilization altered the hydrophilic character of clay structure into hydrophobic channels by replacing inorganic cations with organic cations that in turn, caused basal spacing to increase 15.2 to 23.9 Å This factor was solely, responsible for the strong interactions between BTX and organoclay framework [20]. The equilibrium isotherms and kinetics adsorption models were investigated
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