Preparation and characterization of activated carbon from brown algae (Sargassum sp.) using phosphoric acid activation for heavy metal adsorption
Year: 2025
Type: article
Abstract: This study presents the successful preparation and evaluation of activated carbon derived from brown seaweed (Sargassum sp.) waste using chemical activation with zinc chloride (ZnCl₂) and thermal treatment. The resulting biosorbent was characterized by its iodine number, surface morphology, and adsorption efficiency for hexavalent chromium (Cr⁶⁺) ions in aqueous solutions. The activated carbons exhibited high microporosity, with iodine numbers reaching 290 mg/g at 800 °C, closely comparable to commercial activated carbon. SEM analysis revealed a porous surface structure, supporting its high adsorption capacity. Batch adsorption experiments demonstrated that Cr⁶⁺ removal efficiency was strongly influenced by solution pH, initial ion concentration, and contact time. Optimal removal (>90%) was achieved at pH 2, low metal concentrations, and a contact time of 120 minutes. The bio-based activated carbon showed promising potential as a cost-effective and environmentally friendly material for heavy metal remediation. This approach contributes to sustainable waste valorization and supports circular economy practices.
Authors: Sơn, Lê Xuân, Thuất, Nguyễn Đình, Cuong, Dang Xuan
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7106586225
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