Removal of arsenic and mercury species from water by covalent triazine framework encapsulated γ-Fe 2 O 3 nanoparticles.

The covalent triazine framework, CTF-1, served as host material for the in situ synthesis of Fe2 O3 nanoparticles. The composite material consisted of 20 ± 2 m% iron, mainly in γ-Fe2 O3 phase. The resulting γ-Fe2 O3 @CTF-1 was examined for the adsorption of AsIII , AsV and HgII from synthetic solutions and real surface-, ground- and wastewater. The material shows excellent removal efficiencies, independent from the presence of Ca2+ , Mg2+ or natural organic matter and only limited dependency on the presence of phosphate ions. Its adsorption capacity towards arsenite (198.0 mg g-1 ), arsenate (102.3 mg g-1 ) and divalent mercury (165.8 mg g-1 ) belongs amongst the best-known adsorbents, including many other iron-based materials. Regeneration of the adsorbent can be achieved for use over multiple cycles without a decrease in performance by elution at 70 °C with 0.1 M NaOH, followed by a stirring step in a 5 m% H2 O2 solution for As or 0.1 M thiourea and 0.001 M HCl for Hg. In highly contaminated water (100 μg L-1 ), the adsorbent polishes the water quality to well below the current WHO limits.