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Mesoporous Organic–Inorganic Hybrid Aerogels Through Ultrasonic Assisted sol–gel Intercalation of Silica–PEG in Bentonite for Effective Removal of Dyes, Volatile Organic Pollutants and Petroleum Products from Aqueous Solution

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dc.contributor.author Suchithra, P S
dc.contributor.author Linsha Vazhayal
dc.contributor.author Peer Mohamed, A
dc.contributor.author Ananthakumar, S
dc.date.accessioned 2016-07-27T11:31:31Z
dc.date.available 2016-07-27T11:31:31Z
dc.date.issued 2012-06-19
dc.identifier.citation Chemical Engineering Journal:200-202:589-600 en_US
dc.identifier.uri http://hdl.handle.net/123456789/2368
dc.description.abstract Hybrid mesoporous materials with high surface area (1144 m 2 /g) and enhanced thermal stability were achieved through ultrasonication assisted sol–gel-intercalation technique using bentonite clay and PEG grafted sol gel silica. Solvent extraction with mixed solvents showed efficient aerogel formation of the hybrids. The products were characterised by small angle X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, zeta potential measurement and BET surface area analysis. The XRD analysis showed interlayer spacing of 43.28 Å. The increasing spacing is interesting in a way that the available interior pore volume can be tailored for the enhanced adsorption of different pollutants. Clay-hybrid porous materials showed hydrophobic nature with high adsorption capacities for organic dyes (methylene blue and malachite green), volatile organic pollutants (phenol and toluene) and petrochemical derivatives (kerosene, engine oil and diesel). The contact time necessary to attain adsorption equilibrium and the optimum pH were found to be 2 h and 5.0–6.0, respectively. Kinetics of adsorption was rapid film diffusion with a pseudo-second-order rate constant. The best interpretation for the equilibrium data was given by the Langmuir isotherm indicative of homogenous surface and maximum adsorption capacity of clay-hybrid towards methylene blue, malachite green, phenol and toluene from aqueous solution was found to be 101.55, 98.42, 116.75 and 114.10 mg/g, respectively, and was found to be greater than commercial adsorbents like activated carbon, zeolite and activated alumina. Thermal regeneration studies were carried out by calcinating the exhausted adsorbents. Clay-hybrid aerogels were then demonstrated using different petroleum products to exhibit excellent oil absorption properties en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Mesoporous en_US
dc.subject Polymer/clay hybrid en_US
dc.subject Sol–gel intercalation en_US
dc.subject Adsorption en_US
dc.subject Organic pollutants en_US
dc.subject Thermal regeneration en_US
dc.title Mesoporous Organic–Inorganic Hybrid Aerogels Through Ultrasonic Assisted sol–gel Intercalation of Silica–PEG in Bentonite for Effective Removal of Dyes, Volatile Organic Pollutants and Petroleum Products from Aqueous Solution en_US
dc.type Article en_US
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