A Comparative Study on Silica Sands as Absorbents for the Removal of Hexavalent Chromium Ions from Aqueous Solutions

Abstract:

Silica sand is the main material in glass production. It can also be used for water purification. In this work, two types of silica sand used for the glass production were directly applied in the removal of Cr⁶⁺ from aqueous solutions. The chemical composition, loss-on-ignition, acid solubility and surface area of the two sands are compared. The results indicate that both sands are quite similar in chemical and mineral compositions. However, sand B has a higher organic content, a smaller crystalline grain size, a larger surface area and acid solubility. As a result, sand B shows a larger absorption of Cr⁶⁺ than sand A. In addition, both sands exhibit declined absorption of Cr⁶⁺ with increasing the pH of the solution from 1 to 3. No absorption occurred when the pH was higher than 3.

• Periodical: Applied Mechanics and Materials (Volumes 670-671)
• Pages: 189-192
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.670-671.189
• Online since: October 2014
• Authors: Yun Zhang, Shi Quan Liu*
• Keywords: Absorption, Hexavalent Chromium Ions, Silica Sand

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