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

JOURNAL OF HAZARDOUS MATERIALS

卷:353

Article

Leus, Karen¹  Folens, Karel²  Nicomel, Nina Ricci²  Perez, Jeffrey Paulo H.^1,2,5  Filippousi, Maria³  Meledina, Maria³  Dirtu, Marinela M.⁴  Turner, Stuart³  Van Tendeloo, Gustaaf³  Garcia, Yann⁴  Du Laing, Gijs²  Van Der Voort, Pascal¹ 

[1] Univ Ghent, Fac Sci, COMOC, Dept Chem, Krijgslaan 281,S3, B-900 Ghent, Belgium

[2] Univ Ghent, Fac Biosci Engn, Lab Analyt Chem & Appl Ecochem, Coupure Links 653, B-9000 Ghent, Belgium

[3] Univ Antwerp, EMAT, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

[4] Catholic Univ Louvain, Inst Condensed Matter & Nanosci, IMCN MOST, Mol,Solids,React, Pl Louis Pasteur 1, B-1348 Louvain La Neuve, Belgium

[5] GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, D-14473 Potsdam, Germany

关键词: Arsenic;    Mercury;    Covalent organic frameworks;    Iron oxide nanoparticles;    Water treatment;   

DOI  :  10.1016/j.jhazmat.2018.04.027

来源: Elsevier

【 摘 要 】

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 gamma-Fe2O3@CTF-1 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.

【 授权许可】

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