Sodium lignosulfonate as an extracting agent of methylene blue dye using a polymer-enhanced ultrafiltration technique

• Published in: International journal of biological macromolecules 2024-08, Vol.275 (Pt 1), p.133567, Article 133567
• Main Authors: Sotelo, Sebastián, Oyarce, Estefanía, Roa, Karina, Boulett, Andrés, Pizarro, Guadalupe, Sánchez, Julio
• Format: Article
• Language: English
• Subjects: adsorbents; Biopolymer; Dye; industrial wastes; Lignin; lignosulfonates; liquids; methylene blue; molecular weight; sodium; textile industry; Ultrafiltration; Water treatment
• ISSN: 0141-8130; 1879-0003; 1879-0003
• DOI: 10.1016/j.ijbiomac.2024.133567

The purpose of this research was to evaluate the efficacy of sodium lignosulfonate (LS) as a dye adsorbent in the removal of methylene blue (MB) from water by polymer-enhanced ultrafiltration. Various parameters were evaluated, such as membrane molecular weight cut-off, pH, LS dose, MB concentration, applied pressure, and the effect of interfering ions. The results showed that the use of LS generated a significant increase in MB removal, reaching an elimination of up to 98.0 % with 50.0 mg LS and 100 mg L−1 MB. The maximum MB removal capacity was 21 g g−1 using the enrichment method. In addition, LS was reusable for up to four consecutive cycles of dye removal-elution. The removal test in a simulated liquid industrial waste from the textile industry was also effective, with a MB removal of 97.2 %. These findings indicate that LS is highly effective in removing high concentrations of MB dye, suggesting new prospects for its application in water treatment processes. [Display omitted]