期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 284, 期 -, 页码 171-181出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.10.054
关键词
3D Ag2O-Ag/TiO2; Cooperative effects; Photocatalytic adsorption; Radioactive iodide; Cyclic regeneration
资金
- National High Technology Research and Development Program of China (863 Program) [2012AA063504]
- National Natural Science Foundation of China [21276193]
- Tianjin Municipal Science and Technology Commission of China [2013F1-0033]
- Project of Ocean with Scientific Technology in Tianjin [KJXH2011-10]
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 (I-). The photocatalytic adsorption capacity (207.6 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 Cl- is up to 590 times that of I-. The capability of the composites to remove even trace amounts of I- 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 I- 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 I-, the photocatalytic ability of Ag/TiO2 for oxidation of I-, and the readsorption performance of AgI for I-2. (C) 2014 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据