Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 7, Pages 2119-2128Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta13526h
Keywords
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Funding
- National Key Scientific Program-Nanoscience and Nanotechnology [2011CB933700]
- Chinese Academy of Sciences, China
- National Natural Science Foundation of China [21103198, 61273066, 21073197, 11205204]
- China Postdoctoral Science Foundation [20110490386, 2011M501073]
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Mg-Al-LDH nanoflake impregnated magnetic alginate beads (LDH-n-MABs) were successfully synthesized and their defluoridation performance was systematically evaluated. Batch experiments showed that the LDH-n-MABs outperformed many other reported adsorbents with higher adsorption capacities. The effects of various limiting factors including pH, contact time, initial fluoride concentration, temperature, and co-existing substances were investigated. XPS and FT-IR measurements evidenced the complex uptake mechanism of fluoride onto the LDH-n-MABs. The advantages of this adsorbent are as follows: (1) Mg-Al-LDH nanoflakes with a higher adsorption capacity for F- were immobilized into alginate beads without leaching, taking the safety issues concerning nanomaterials into consideration; (2) the prepared beads had a high magnetic sensitivity to an external magnetic field providing an easy and efficient way to separate them from aqueous solution; (3) the bio-based sorbents offer advantages such as biodegradability, hydrophilic properties, natural origin and a high abundance. Furthermore, the results from the real fluoride contaminated groundwater study confirmed the feasibility of LDH-n-MABs for fluoride removal.
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