Synthesis, Ion Exchange Properties, and Applications of Amorphous Cerium(III) Tungstosilicate

Authors: Yavari, R.¹; Ahmadi, S. J.¹; Huang, Y. D.²; Bagheri, G.¹

Source: Separation Science and Technology, Volume 43, Number 15, November 2008 , pp. 3920-3935(16)

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Abstract:

A novel hetropolyacid-based cation exchanger cerium(III) tungstosilicate was synthesized in amorphous form by mixing tungstosilisic acid (TSA) solutions to cerium(III) nitrate solutions at different Ce:TSA ratios. The materials were precipitated from the liquid phase by raising the pH of the solutions using sodium hydroxide. The produced ion exchange powders were characterized using powder X-ray diffractometry, thermogravimetry, infrared spectrometry, inductively coupled plasma and atomic absorption elemental analysis. The materials which were dried at 50°C were found to be stable in water, dilute acids, alkaline solutions, and high temperature up to 1000°C. The Ion exchange properties of the synthesized samples were studied by measuring the distribution coefficients (Kd) for 29 metal ions in demineralized water and nitric acid media. On the basis of Kd values, some quantitative separations such as Co2+-Pb2+, Cr3+-Zr4+, and Mo6+- W6+ are achieved on their columns.

Keywords: cerium(III) tungstosilicate; distribution coefficients; hetropolyacids; inorganic ion exchanger; separation

Document Type: Research article

DOI: http://dx.doi.org/10.1080/01496390802215024

Affiliations: 1: Nuclear Science and Technology Research Institute, Nuclear Science Research School, Tehran, IRAN 2: Polymer Materials and Engineering Division, Department of Applied Chemistry, Faculty of Science, Harbin Institute of Technology, Harbin, Peoples Republic of China

Publication date: 2008-11-01