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Diagram representing the 3D-printed monolithic biofilters based on a polylactic acid (PLA) – hydroxyapatite (HAp) biocomposite for heavy metal removal from an aqueous medium. (a) Reference PLA filter with a uniform porosity. (b) Corresponding PLA/Hap filter. (c) Reference PLA filter with gradient porosity. (d) PLA/Hap filter [188].
