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Synthesis and Adsorption Properties of Ca-Al Layered Double Hydroxides for the Removal of Aqueous Fluoride

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Abstract

Ca-Al layered double hydroxides (LDHs) with different Ca/Al molar ratios were composited at pH ranges, using a co-precipitation method, and were experimented to remove fluoride from wastewater and studied in terms of isotherm models such as Langmuir and Freundlich reactions. The composite LDHs were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and Thermogravimetric analysis (TGA). The results showed that different synthesis conditions of Ca-Al LDHs had an influence on their morphology, layered structure, and particle size distribution, which substantially affected the uptake capacity for aqueous fluoride. LDHs with the Ca/Al molar ratio of 2 and synthesized at the pH of 12 had the highest capacity for the fluoride removal (e.g., 146.6 mg/g) and such reaction reached an equilibrium within 1 h. The Freundlich model was a better fit for this study. The high adsorption method of Ca-Al LDHs can be favorable to removing fluoride from wastewater streams.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China

    Zhaowei Sun, Wenqi Zhang, Runkai Wang & Pinhua Rao

  2. Department of Environmental Engineering, Kangwon National University, Gangwon-do, Samcheok, 25913, South Korea

    Joon-Seok Park

  3. EST and ES, Inc., 5532 E. La Palma Ave., Anaheim, CA, 92807, USA

    Daeik Kim

  4. Seohae Environment Science Institute, Jeonju, 54817, South Korea

    Chul-Ho Shin

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  1. Zhaowei Sun
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  2. Joon-Seok Park
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  3. Daeik Kim
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  4. Chul-Ho Shin
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  5. Wenqi Zhang
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  6. Runkai Wang
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  7. Pinhua Rao
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Correspondence to Runkai Wang or Pinhua Rao.

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Sun, Z., Park, JS., Kim, D. et al. Synthesis and Adsorption Properties of Ca-Al Layered Double Hydroxides for the Removal of Aqueous Fluoride. Water Air Soil Pollut 228, 23 (2017). https://doi.org/10.1007/s11270-016-3160-0

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