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Chromium(VI) adsorption from aqueous solutions onto thermo-acid activated   sepiolite functionalized with (3-mercaptopropyl)trimethoxy-silane and   [3-(2-aminoethylamino)pro-pyl]trimethoxy-silane, was investigated. Scanning   electron microscopy, X-ray diffraction, Fourier transform infrared   spectroscopy, thermogravimetric and differential thermal analysis, nitrogen   adsorption-desorption, and determination of the point of zero charge were   used to characterize the obtained adsorbents. It has been established that   the silanes were successfully grafted on the thermo-acid activated sepiolite   surfaces and that the structure of parent material was preserved during the   functionalization. The adsorption of Cr(VI) onto functionalized thermo-acid   activated sepiolite was tested as a function of initial pH values at 298 K.   The amine functionalized thermo-acid activated sepiolite showed a higher   adsorption capacity than the mercapto functionalized thermo-acid activated   sepiolite at all studied initial pH values, especially at the initial pH = 2.   [Projekat Ministarstva nauke Republike Srbije, br. III45019

Functionalization of thermo-acid activated sepiolite by amine-silane and mercapto-silane for chromium(VI) adsorption from aqueous solutions