Fe3O4@MIL‐101 – A Selective and Regenerable Adsorbent for the Removal of As Species from Water. Issue 27 (21st April 2016) - Folens, Karel
Abstract : The chromium‐based metal–organic framework MIL‐101(Cr) served as a host for the in situ synthesis of Fe3 O4 nanoparticles. This hybrid nanomaterial was tested as an adsorbent for arsenite and arsenate species in groundwater and surface water and showed excellent affinity towards As III and As V species. The adsorption capacities of 121.5 and 80.0 mg g –1 for arsenite and arsenate species, respectively, are unprecedented. The presence of Ca 2+, Mg 2+, and phosphate ions and natural organic matter does not affect the removal efficiency or the selectivity. The structural integrity of the hybrid nanomaterial was maintained during the adsorption process and even after desorption through phosphate elution. Additionally, no significant leaching of Cr or Fe species was observed. Abstract : MIL‐101(Cr) serves as a host for the in situ synthesis of Fe3 O4 nanoparticles. The resulting material shows excellent affinity towards As III and As V species in water. Ca 2+, Mg 2+, and phosphate ions as well as natural organic matter do not affect the removal efficiency or selectivity. The structural integrity of the host is maintained during the adsorption and desorption process.