Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
576225 | Journal of Hazardous Materials | 2015 | 11 Pages |
Abstract
Three-dimensional Ag2O and Ag co-loaded TiO2 (3D Ag2O-Ag/TiO2) composites have been synthesized through a facile method, characterized using SEM, EDX, TEM, XRD, XPS, UV-vis DRS, BET techniques, and applied to remove radioactive iodide ions (Iâ). The photocatalytic adsorption capacity (207.6Â mg/g) of the 3D Ag2O-Ag/TiO2 spheres under visible light is four times higher than that in the dark, which is barely affected by other ions, even in simulated salt lake water where the concentration of Clâ is up to 590 times that of Iâ. The capability of the composites to remove even trace amounts of Iâ from different types of water, e.g., deionized or salt lake water, is demonstrated. The composites also feature good reusability, as they were separated after photocatalytic adsorption and still performed well after a simple regeneration. Furthermore, a mechanism explaining the highly efficient removal of radioactive Iâ has been proposed according to characterization analyses of the composites after adsorption and subsequently been verified by adsorption and desorption experiments. The proposed cooperative effects mechanism considers the interplay of three different phenomena, namely, the adsorption performance of Ag2O for Iâ, the photocatalytic ability of Ag/TiO2 for oxidation of Iâ, and the readsorption performance of AgI for I2.
Keywords
Related Topics
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Authors
Shuaishuai Liu, Na Wang, Yuchang Zhang, Yaru Li, Zhuo Han, Ping Na,