Removal of Selenium from Aqueous Sample Using Calcium Alumino-Zincate

Abstract:

Aiming to apply in removal of selenium from contaminated waste water, we have studied the immobilization of Se (IV) and Se (VI) into the hydrate of calcium alumino-zincate (14CaO.5Al₂O₃.6ZnO, shown as C₁₄A₅Z₆). By adding 2 g of C₁₄A₅Z₆ to 1 L of 5 mg/L Se (VI) solution, the concentration of Se (VI) was decreased to less than 0.01 mg/L within 60 minutes. In the case of using 1 g of calcium hydroxide with 2 g of C₁₄A₅Z₆, the Se (VI) concentration reached to 0.01 mg/L within 30 minutes. On the other hand, the concentration of Se (IV) was decreased from 5 mg/L to 0.16 mg/L in 60 minutes whilst it reached to 0.041 mg/L by adding calcium hydroxide in the same reaction period. The immobilization capacity of selenium were 222 and 127 mg/g for Se (IV) and Se (VI), respectively. By adding calcium hydroxide, the immobilization capacity of C₁₄A₅Z₆ was increased to 240 and 200 mg/g for Se (IV) and Se (VI), respectively.

• Periodical: Key Engineering Materials (Volume 617)
• Pages: 121-124
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.617.121
• Online since: June 2014
• Authors: Masaya Hirano*, Masahiko Murakami, Junichi Ohya, Hiroyuki Sango
• Keywords: Calcium Alumino-Zincate, Calcium Hydroxide, Immobilisation, Selenium

References

[1] S. Takahashi, M. Daimon and E. Sakai, Sorption of CrO42- for Cement Hydrates and the Leaching from Cement Hydrates after Sorption, Proceedings of 11th International Congress on the Chemistry of Cement, 2166-2173 (2003).

[2] M. Hirano, M. Murakami, M. Sugano and H. Sango, Removal of Hexavalent Chromium from Aqueous Sample by Calcium Alumino-zincate, Proceedings of 13th International Congress on the Chemistry of Cement, Paper ID. 91, M4-07. 4 (CD-ROM) (2011).

DOI: 10.4028/www.scientific.net/kem.617.121