Journal
DESALINATION AND WATER TREATMENT
Volume 57, Issue 53, Pages 25830-25841Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/19443994.2016.1155173
Keywords
Layered double hydroxides; Sulfated -cyclodextrin; Magnetic iron oxide; Removal; Methylene blue
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Funding
- National Natural Science Foundation of China [21476269]
- Provincial Natural Science Foundation of Hunan [14JJ2014]
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Nanocage structures derived from sulfated -cyclodextrin (SCD) intercalated MgAl layered double hydroxides (MgAl-NO3 LDHs) were prepared through ion-exchange reactions. Coprecipitation method was used to prepare the composites of magnetic Fe3O4@sulfonated -cyclodextrin intercalated LDH (Fe/SCD-LDH), which was demonstrated having an efficient adsorption capability to cationic pollutants and an excellent reuseability. X-ray diffraction and Fourier transform infrared spectroscopy confirmed that SCD was intercalated successfully and the basal spacing was expanded to 1.63nm. N-2-adsorption/desorption and scanning electron microscopy displayed that the resulting Fe/SCD-LDH possessed high crystallinity, hierarchical structure as well as large specific surface area. Energy-dispersive X-ray spectroscopy was used to investigate the type and content of the elements in Fe/SCD-LDH. Batch adsorption experiments were carried out to investigate the removal of methylene blue (MB) from aqueous solution using Fe/SCD-LDH as the adsorbent. MB was selected owing to its toxic and carcinogenic features as a kind of cationic dye. The adsorption process could be well described by the pseudo-second-order kinetic model and fitted well with the Langmuir isotherm model.
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