Journal
DESALINATION
Volume 259, Issue 1-3, Pages 228-234Publisher
ELSEVIER
DOI: 10.1016/j.desal.2010.03.054
Keywords
Magnesium silicate; Adsorption; Heavy metals; Thermal stability
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Laboratory-prepared magnesium silicate (MgSi-I) was modified with HNO3, H3PO4 and NaOH to give MgSi-II, -III and -IV, respectively. The modified products were examined in respect to structure, thermal stability and ion exchange properties. The investigations indicated that MgSi-I has strong tendency to react with alkaline and acid media, especially with the phosphate group. The sorption performance of the materials for Cu2+, Cd2+, Ni2+ and Fe3+ transition metal ions was studied as a function of pH. The modified materials offer excellent potential for heavy metals removal compared to the unmodified one. Magnesium silicate that treated with HNO3 (MgSi-II) revealed the higher silica content, thermal stability and sorption efficiency relative to the other series. Besides, it retains 62.8% of its ion exchange capacity after heating up to 400 degrees C. (C) 2010 Elsevier B.V. All rights reserved.
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