Transforming residual biomass of Irish red seaweed Asparagopsis taxiformis and Palmaria palmata into biosorbents for methylene blue adsorption
文献类型： 外文期刊
作者： Weihao Meng;Ruipeng Zhang;Siwei Gu;Ming Zhao;Jiani Luo;Colm P. O'Donnell;Yuan Li;Hongnan Sun;Taihua Mu;Marco Garcia-Vaquero
作者机构：
关键词： Biosorbent;Circular economy;Dye adsorption;Residue;Seaweed
期刊名称： Algal Research
ISSN： 2211-9264
年卷期： 2025 年 92 卷
页码：
收录情况： SCIE（2025版）
摘要： This study explores the valorization of residual biomass from red seaweed (Asparagopsis taxiformis and Palmaria palmata) after the extraction of bioactive compounds as efficient biosorbents for methylene blue (MB) removal. MB adsorption was investigated under different conditions (including contact time, initial dye concentration, pH, ionic strength, temperature, and regeneration cycles). The results revealed that adsorption kinetics followed a pseudo-second order model, and isotherms were best described by the Freundlich model, indicating multilayer chemisorption. The residue after ultrasonic extraction of bioactive components had a higher adsorption of MB than the intact biomass. A. taxiformis residue had the highest equilibrium adsorption (161.43 mg/g) at pH 10, surpassing many traditional adsorbents. Thermodynamic analysis confirmed the spontaneity of the adsorption process. The adsorption of MB by At-Dried and At-Residue was endothermic, while the adsorption of MB by Pp-Dried and Pp-Residue was exothermic. The biomass surface was characterized by scanning electron microscopy, fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and zeta potential analyser. It was found that that the ultrasonic effect caused more porous structures to appear in the residue, increasing the surface area and possible adsorption sites, and enhancing the adsorption of MB. The adsorption MB onto the macroalgal biomass follows a multi-step mechanism primarily governed by hydrogen bonding, π-π interactions, electrostatic interaction, and diffusion. These findings confirm the potential of macroalgal processing residues as high-value adsorbents, contributing to a zero-waste paradigm model of seaweed industry and offering a sustainable strategy for wastewater treatment within the circular bioeconomy.
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