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Hexavalent chromium removal by nanocomposite adsorbents comprised of layered double hydroxides and biopolymers (chitosan or lignin)
Two different Double Layered Hydroxides (LDH) were synthesized; the first one Al3+/Mg2+ with Cl- as interlayer anion, and the second Al3+/Zn2+ with NO3- as interlayer anion. Two different biopolymers (Organosolv lignin or Chitosan) were intercalated by the coprecipitation method on each of the LDH’s to obtain nano-biocomposites. The capacities of these materials to adsorb Chromium (VI) from contaminated water was tested. Adsorption studies show that the Al /Mg Cl LDH- chitosan nanocomposite removed more Cr (VI) than the other adsorbents. The maximum adsorption capacity for this material was 90.64 mg/g at 25°C and pH 4. Factors influencing chromium removal by the adsorbents such as contact time, initial pH and Cr (VI) concentration are reported. These adsorbents were further characterized by XRD and FTIR spectroscopy.