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Synthesis and evaluation of Fe3O4-impregnated activated carbon for dioxin removal

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  • Yao Jen Tu
  • Gnanasiri S. Premachandra
  • Stephen A. Boyd
  • J. Brett Sallach
  • Hui Li
  • Brian J. Teppen
  • Cliff T. Johnston


Publication details

DateAccepted/In press - 2 Sep 2020
DateE-pub ahead of print - 6 Sep 2020
DatePublished (current) - Jan 2021
Number of pages9
Early online date6/09/20
Original languageEnglish


Polychlorinated dibenzo-p-dioxins and -furans (PCDD/PCDFs) are highly toxic organic pollutants in soils and sediments which persist over timescales that extend from decades to centuries. There is a growing need to develop effective technologies for remediating PCDD/Fs-contaminated soils and sediments to protect human and ecosystem health. The use of sorbent amendments to sequester PCDD/Fs has emerged as one promising technology. A synthesis method is described here to create a magnetic activated carbon composite (AC-Fe3O4) for dioxin removal and sampling that could be recovered from soils using magnetic separation. Six AC-Fe3O4 composites were evaluated (five granular ACs (GACs) and one fine-textured powder AC(PAC)) for their magnetization and ability to sequester dibenzo-p-dioxin (DD). Both GAC/PAC and GAC/PAC-Fe3O4 composites effectively removed DD from aqueous solution. The sorption affinity of DD for GAC-Fe3O4 was slightly reduced compared to GAC alone, which is attributed to the blocking of sorption sites. The magnetization of a GAC-Fe3O4 composite reached 5.38 emu/g based on SQUID results, allowing the adsorbent to be easily separated from aqueous solution using an external magnetic field. Similarly, a fine-textured PAC-Fe3O4 composite was synthesized with a magnetization of 9.3 emu/g.

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© 2020 Elsevier Ltd. All rights reserved. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.

    Research areas

  • activated carbon-FeO composite, Dibenzo-p-dioxin, FeO, Granular activated carbon, Magnetic separation

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