Removal of iron from aqueous solution using phytolith-aided aggregation

Removal of iron from aqueous solution using phytolith-aided aggregation

[Display omitted] •Phytolith-based material shows its highly-variable charge surface upon pH change.•Aggregation of Fe oxides was favored by the phytolith-based material.•The clearest effect was observed at pH 4–6, where they carry opposite charges.•The finding is applicable to treatment of Fe-rich...

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Bibliographic Details
Published in:Journal of water process engineering Vol. 25; pp. 39 - 44
Main Authors: Mai, Nga T., Tran, Chinh T., Lai, Trung Q., Nguyen, Linh T.K., Nguyen, Huan X., Luong, Van T.T., Nguyen, Khai M., Nguyen, Minh N.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-10-2018
Subjects:
Aggregation
Fe oxide
Oxidation
Phytolith
Removal
Removal
Aggregation
Phytolith
Oxidation
Fe oxide
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Summary:[Display omitted] •Phytolith-based material shows its highly-variable charge surface upon pH change.•Aggregation of Fe oxides was favored by the phytolith-based material.•The clearest effect was observed at pH 4–6, where they carry opposite charges.•The finding is applicable to treatment of Fe-rich drainage. Phytoliths are common biogenic silica materials which can be derived from heat-treatment of Si-rich plant residues. However, there have been few studies identifying its environmental applications. This work, based on the batch experiments with quantification of surface charge and determination of colloidal properties, is an attempt to evaluate the ability of phytolith-based material (PBM) for removing Fe from aqueous solution. Oxidation and aggregation of a synthetic Fe-rich solution were examined under the presence of a PBM sample (obtained from fern Dicranopteris linearis) as functions of pH and ionic strength. Obtained results showed that through electrostatic interaction, the PBM can affect oxidation and aggregation of newly-formed Fe oxides at different extents depending on pH change. The fastest aggregation of the newly-formed Fe oxides was found at the pH range from 4 to 6 and in the presence of phytolith. As the PBM can make the newly-formed Fe oxides less dispersive and less transportable in aqueous solution, it suggests that practices for treatment of Fe-rich drainage or remediation of Fe-contaminated groundwater by supporting aggregation need to consider this effect.
ISSN:2214-7144
2214-7144
DOI:10.1016/j.jwpe.2018.06.006