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Magnetite impregnation effects on the sorbent properties of activated carbons and biochars

Title data

Han, Zhantao ; Sani, Badruddeen ; Mrozik, Wojciech ; Obst, Martin ; Beckingham, Barbara ; Karapanagioti, Hrissi K. ; Werner, David:
Magnetite impregnation effects on the sorbent properties of activated carbons and biochars.
In: Water Research. Vol. 70 (2015) . - pp. 394-403.
DOI: https://doi.org/10.1016/j.watres.2014.12.016

Abstract in another language

This paper discusses the sorbent properties of magnetic activated carbons and biochars produced by wet impregnation with iron oxides. The sorbents had magnetic susceptibil- ities consistent with theoretical predictions for carbon-magnetite composites. The high BET surface areas of the activated carbons were preserved in the synthesis, and enhanced for one low surface area biochar by dissolving carbonates. Magnetization decreased the point of zero charge. Organic compound sorption correlated strongly with BET surface areas for the pristine and magnetized materials, while metal cation sorption did not show such a correlation. Strong sorption of the hydrophobic organic contaminant phenanthrene to the activated carbon or biochar surfaces was maintained following magnetite impreg- nation, while phenol sorption was diminished, probably due to enhanced carbon oxidation. Copper, zinc and lead sorption to the activated carbons and biochars was unchanged or slightly enhanced by the magnetization, and iron oxides also contributed to the composite metal sorption capacity. While a magnetic biochar with 219 ± 3.7 m2/g surface area nearly reached the very strong organic pollutant binding capacity of the two magnetic activated carbons, a magnetic biochar with 68 ± 2.8 m2/g surface area was the best metal sorbent. Magnetic biochars thus hold promise as more sustainable alternatives to coal-derived magnetic activated carbons.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER135367
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 29 Jul 2016 07:07
Last Modified: 29 Jul 2016 07:07
URI: https://eref.uni-bayreuth.de/id/eprint/33688