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Title
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Removal of arsenic and mercury species from water by covalent triazine framework encapsulated nanoparticles
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Author
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Abstract
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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 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. |
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Language
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English
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Source (journal)
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Journal of hazardous materials. - Amsterdam
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Publication
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Amsterdam
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2018
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ISSN
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0304-3894
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DOI
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10.1016/J.JHAZMAT.2018.04.027
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Volume/pages
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353
(2018)
, p. 312-319
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ISI
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000438002800035
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Pubmed ID
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29679891
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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