Novel Approach to Synthetic Mg(II)Fe(III) Layered Double Hydroxide Using Waste Serpentine Tailings
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 21, Issue 3
Abstract
Layered double hydroxides (LDHs) are usually synthesized by a conventional coprecipitation using inorganic salts. In this study, waste serpentine tailings (WSTs), including MgO and with contents of 34 and 4.27%, were used to prepare Mg(II)Fe(III) LDHs. Firstly, WSTs were leached in a nitric acid solution at 90°C using a refluxing process in the presence of a ratio of . By a countercurrent leaching process, the acidity of the leaching solution not only was decreased but Mg and Fe were also enriched. Subsequently, waste iron was put into the leaching solution, which was used to adjust molar ratio of magnesium to ferrum. Finally, 30% NaOH solution was slowly put into the described solution to synthesize Mg(II)Fe(III)LDHs. The structure and surface morphology of the LDHs were characterized by an X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed typical structure of Mg(II)Fe(III) brucitelike sheets with exchangeable capability in an interlayer space. This study indicated that it was feasible to synthesize Mg(II)Fe(III) LDHs using WSTs and waste iron.
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Acknowledgments
The authors are grateful for support from the Program of Innovative Research Team in University (IRT13078), the Innovation Program of Shanghai Municipal Education Commission (14YZ002), and Shanghai Cooperative Centre for WEEE (B50ZS120003).
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 21 • Issue 3 • July 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 12, 2016
Accepted: Jul 19, 2016
Published online: Sep 7, 2016
Discussion open until: Feb 7, 2017
Published in print: Jul 1, 2017
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