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Cationic and anionic clays as potential adsorbents for Cr(VI) | Katjonske i anjonske gline kao moguci adsorbenti za Cr(VI)
2009
Marjanovic, V., Visoka poslovna-tehnicka skola, Uzice (Serbia) | Petrovic, R., Univerzitet u Beogradu, Beograd (Serbia). Tehnolosko-metalurski fakultet | Aksentijevic, S., Visoka poslovno-tehnicka skola, Uzice (Serbia)
Anionic clays (layered double hydroxides) comprise positively charged layers with at least two different metal cations, octahedrally coordinated by hydroxyl groups. The positive charges of layered double hydroxides are counterbalanced by interlayer anions. The interlayer anions and water, which fill the interlayer space, are often labile. Therefore, anionic clays exhibit anion exchange capacity (AEC). Anionic clays which have a high surface area and a high anion exchange capacity, are potential adsorbents for anionic contanimants, such as the oxyanion of chrome. The adsorption study of chromium (VI) from aqueous solutions by natural cationic clay mineral (kaolinite, montmorillonite, etc.) was not given much attention, perhaps due to the fact cationic clays have negatively charged layers and clay mineral surface shows no affinity for oxyanion of chrome.
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