University of Oulu

Zhang, R., Leiviskä, T., Taskila, S., Tanskanen, J. (2018) Iron-loaded Sphagnum moss extract residue for phosphate removal. Journal of Environmental Management, 218 (), 271-279. doi:10.1016/j.jenvman.2018.04.055

Iron-loaded Sphagnum moss extract residue for phosphate removal

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Author: Zhang, Ruichi1; Leiviskä, Tiina1; Taskila, Sanna1;
Organizations: 1University of Oulu, Chemical Process Engineering
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
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Language: English
Published: Elsevier, 2018
Publish Date: 2020-04-21


Sphagnum moss extract residue (SMER), obtained after pressurized hot water extraction, was modified with Fe(III) and investigated for phosphate sorption. Although moss extract contains value-added compounds, SMER is considered to be waste until suitable uses can be developed. The effect of modification conditions were investigated, i.e. different initial Fe(III) concentrations (0.024, 0.048 and 0.072 mol/L Fe3+) and modification pH values (5, 7 and 9). A modification pH of 5 and the highest initial Fe(III) concentration (0.072 mol/L Fe3+) resulted in the highest phosphate removal efficiency, and thus was selected for further study. The removal efficiency was found to decrease with increasing pH in the range of 3–9. Maximum removal efficiency (82%) for phosphate sorption was observed at pH 3 after 24 h contact time (dosage 2 g/L, initial concentration 15 mg P/L). With increased contact time, the phosphate removal efficiency improved and reached equilibrium within 48 h. The Elovich model was found to provide the best fit to the kinetic data. A capacity of 9–13 mg P/g was obtained with a 24-h contact time at pH 4. A good fit was achieved with the Redlich–Peterson equation. FTIR analysis confirmed that carboxylic acid groups were involved in the modification process. X-ray diffraction analyses showed that amorphous two-line ferrihydrite was precipitated onto SMER, which was supported by X-ray photoelectron spectroscopy analyses.

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Series: Journal of environmental management
ISSN: 0301-4797
ISSN-E: 1095-8630
ISSN-L: 0301-4797
Volume: 218
Pages: 271 - 279
DOI: 10.1016/j.jenvman.2018.04.055
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
218 Environmental engineering
Funding: The research was funded by Maa- ja vesitekniikan tuki ry. and the European Regional Development Fund (as part of the SuoBio project, “Sustainable refining of peatland biomasses into valuable products”).
Copyright information: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license