A series of novel zeolitic imidazolate framework (ZIF) decorated superparamagnetic graphene oxide hybrid nanoadsorbents were synthesized, characterized, and tested for their As(III) adsorbed amount in simulated drinking water. A series of three ZIFs with zinc (ZIF-8), cobalt (ZIF-67) and mixed zinc/cobalt cores (ZIF-Zn/Co) was studied. The three composite nanomaterials, namely C-1 C-2 and C-3, and their parent materials were characterized through pXRD, TEM, FTIR, BET and magnetometry methods (SQUID), and were tested as adsorbents in a representative drinking water matrix containing arsenite (As(III)) at an initial concentration of 35 ppb. The nanoadsorbents were magnetically removed after use in batch or continuous-flow reactors. Out of the three composites, C-2 shows the highest As(III) adsorbed amount at an initial concentration of 35 ppb (q0) of  202 µg/g, followed by C-3 with 102 µg/g and C-1 with 82 µg/g. After magnetic recovery, residual dissolved Fe, and Zn were quantified in order to assess the leaching of the nanomaterials.

Magnetic composite nanomaterials for water treatment applications

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