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

V. Marjanović | Zendy; Slavica Lazarević | Zendy; Ivona JankovićČastvan | Zendy; Bojan Jokić | Zendy; Andjelika Bjelajac | Zendy; Djordje Janaćković | Zendy; Rada Petrović | Zendy

Open Access

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

Author(s) -

V. Marjanović,

Slavica Lazarević,

Ivona JankovićČastvan,

Bojan Jokić,

Andjelika Bjelajac,

Djordje Janaćković,

Rada Petrović

Publication year - 2012

Publication title -

hemijska industrija

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.147

H-Index - 19

eISSN - 2217-7426

pISSN - 0367-598X

DOI - 10.2298/hemind121026117m

Subject(s) - sepiolite , silane , adsorption , thermogravimetric analysis , surface modification , aqueous solution , silanes , chemistry , fourier transform infrared spectroscopy , desorption , inorganic chemistry , chromium , amine gas treating , nuclear chemistry , materials science , chemical engineering , organic chemistry , raw material , engineering

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

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