Electrokinetic and adsorption properties of sepiolite modified by 3-aminopropyltriethoxysilane

Surface modification of clay minerals has become increasingly important for improving the practical applications of clays such as fillers and adsorbents. An investigation was carried out on the surface modification of sepiolite with aminopropylsilyl groups in 3-aminopropyltriethoxysilane (3-APT). Th...

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Bibliographic Details
Published in:Journal of hazardous materials 2007-11, Vol.149 (3), p.650-656
Main Authors: Demirbaş, Özkan, Alkan, Mahir, Doğan, Mehmet, Turhan, Yasemin, Namli, Hilmi, Turan, Pınar
Format: Article
Language:English
Subjects:
3-Aminopropyltriethoxysilane
Adsorption
Applied sciences
Chemical engineering
Chemistry, Physical - methods
Decontamination. Miscellaneous
Electrolytes
Exact sciences and technology
Hydrogen-Ion Concentration
Industrial Waste
Ions
Kinetics
Magnesium Silicates - chemistry
Metal ions
Metals - chemistry
Models, Chemical
Modification
Pollution
Propylamines
Sepiolite
Silanes - chemistry
Soil and sediments pollution
Surface Properties
Temperature
Water Purification - methods
Zeta potential
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Summary:Surface modification of clay minerals has become increasingly important for improving the practical applications of clays such as fillers and adsorbents. An investigation was carried out on the surface modification of sepiolite with aminopropylsilyl groups in 3-aminopropyltriethoxysilane (3-APT). The zeta potential of the modified sepiolite suspensions was measured as a function of initial electrolyte concentration and equilibrium pH using a Zeta Meter 3.0 for modified sepiolite. The utility of the 3-APT-modified sepiolite was investigated as an adsorbent for removal of various heavy metal ions such as Fe, Mn, Co, Zn, Cu, Cd and Ni from aqueous solutions. The effects of various factors on the adsorption, such as pH, ionic strength and temperature of the solution were studied. The results showed that the amount adsorbed increases with solution pH in the pH range of 1.5 and 7.0; indicated that the modified sepiolite adsorbed Fe and Mn ions more than other metal ions such as Co, Zn, Cu, Cd and Ni. It was found that the temperature had an important effect on metal ion adsorption by the modified sepiolite. The adsorption isotherm has been determined and data have been analyzed according to the Langmuir and Freundlich models.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2007.04.036