Biochar from olive mill solid waste as an eco-friendly adsorbent for the removal of polyphenols from olive mill wastewater

[Display omitted] •Olive mill solid wastes were transformed into low-cost biochar by slow pyrolysis.•Biochar was used for the removal of polyphenols via batch adsorption.•Hydroxytyrosol appeared to have high adsorption affinity for the biochar.•Central composite design was applied to model polypheno...

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