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Removal of arsenic and mercury species from water by covalent triazine framework encapsulated γ -Fe2O3 nanoparticles

  • Leus, Karen
  • Folens, Karel
  • Nicomel, Nina Ricci
  • Perez, Jeffrey Paulo
  • Filippousi, Maria
  • Meledina, Maria
  • Dîrtu, Marinela M
  • Turner, Stuart
  • Van Tendeloo, Gustaaf
  • Garcia, Yann
  • Du Laing, Gijs
  • Van Der Voort, Pascal
Publication Date
Jan 01, 2018
Ghent University Institutional Archive
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The covalent triazine framework, CTF-1, served as host material for the in situ synthesis of Fe2O3 nanoparticles. The composite material consisted of 20 +/- 2 m% iron, mainly in gamma-Fe2O3 phase. The resulting [email protected] was examined for the adsorption of As-III, As-V and H-II 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 degrees C with 0.1 M NaOH, followed by a stirring step in a 5 m% H2O2 solution for As or 0.1 M thiourea and 0.001 M HCl for Hg. In highly contaminated water (100 mu gL(-1)), the adsorbent polishes the water quality to well below the current WHO limits.

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