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Removal of Perchlorate in Water by Calcined MgAl-CO3 Layered Double Hydroxides

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Perchlorate is widely known as an inorganic endocrine disruptor. In this study, MgAl-CO3 layered double hydroxides with different Mg/Al molar ratios were prepared using a coprecipitation method and followed by a calcination process at a temperature range of 300 to 700°C. Results showed that the best synthesis conditions were a calcination temperature of 550°C and Mg/Al molar ratio of 3. Further, the adsorbent and its adsorption product were characterized by x-ray diffraction, Fourier transform‐infrared spectroscopy, and thermogravimetric‐differential thermal analysis. The layered double hydroxides structures in the adsorbent were lost during calcination at 550°C but were reconstructed subsequent to adsorption of perchlorate, indicating that the “memory effect” appeared to play an important role in perchlorate adsorption. The perchlorate adsorption pattern was best described by the pseudo-second-order kinetics model, while the Freundlich isotherms appropriately explained perchlorate adsorption data.
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Keywords: calcination; layered double hydroxides; perchlorate removal

Document Type: Research Article

Affiliations: 1: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China. 2: Department of Earth and Environmental Studies, Montclair State University, Montclair, New Jersey, United States.

Publication date: 2013-04-01

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    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

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