Removal of Toxic Oxyanion from Aqueous Solution Using Calcium Alumino-Zincate

Abstract:

Various problems related to pollution of soil and groundwater caused by toxic oxyanion have been actualized in recent years. In particular, the enlargement of the polluted area by diffusion of chromate ions has been a worry in Japan, and arsenic pollution of well water is also a serious problem in South Asia nations. Removal process of chromate and arsenic in aqueous solution using 14CaO·5Al₂O₃·6ZnO, which is an easy-to-use method technically, has been investigated in our laboratory. The results obtained are summarized as follows: 1) Oxyanion of chromium and arsenic such as CrO₄^2-, AsO₃^3- and AsO₄^3- ions are able to be removed from aqueous solution by addition of 14CaO·5Al₂O₃·6ZnO, however, the removal rate of those arsenic ions are much lower than that of CrO₄^2-. 2) Removal of CrO₄^2- from aqueous solution is caused by the immobilization to 3CaO·Al₂O₃·CaCrO₄·12H₂O, on the other hand, both AsO₃^3- and AsO₄^3- mainly occurred by the adsorption to unhydrated 14CaO·5Al₂O₃·6ZnO. 3) Simultaneous use of 14CaO·5Al₂O₃·6ZnO and calcium hydroxide is an effective method in the removal of CrO₄^2-, AsO₃^3- and AsO₄^3- from aqueous solution.

• Periodical: Key Engineering Materials (Volume 617)
• Pages: 40-45
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.617.40
• Online since: June 2014
• Authors: Hiroyuki Sango*, Masaya Hirano
• Keywords: Arsenic, Calcium Alumino-Zincate, Chromium, Ion Removal, Pollution, Toxic Oxyanion

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