Application of a dealginated seaweed derivative for the simultaneous metal ions removal from real and synthetic effluents

Autor(es)

Dias Costa, Camila Stefanne ; Bertagnolli, Caroline ; Boos, Anne ; Carlos da Silva, Meuris Gurgel ; Adeodato Vieira, Melissa Gurgel

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF WATER PROCESS ENGINEERING; v. 37, p. 11-pg., 2020-10-01.

Resumo

In this study, the alginate extraction residue (RES) from Sargassum filipendula was employed as biosorbent for the simultaneous removal of Cr3+ , Ni2+ and Zn2+ from ternary synthetic solutions and for the decontamination of industrial (leather industry) and urban real effluents that were collected from different areas of Strasbourg (France). For this purpose, biosorption experiments in batch mode, multimetals equilibrium isotherms fitting and biosorbent characterization were carried out. In synthetic effluents, RES exhibited a greater affinity for Cr3+ ions, while a still unknown affinity for Al3+ and Pb2+ was verified for real conditions, reaching up to 80 % removal in some cases. At equilibrium, the higher sorption capacities were found at 50 degrees C as 0.864, 0.302 and 0.347 mmol/g for Cr3+, Zn2+ and Ni2+, respectively. Regarding the equilibrium models fitting, just the Extended Langmuir equation was able to describe the experimental data, showing an increase in q(max) as the temperature rose, besides a decay in K-L,K-1,K- K(L,2 )and K-L,K-3 at the higher temperatures that indicates a weakening of adsorbent-adsorbate interactions. The characterization analyzes revealed a complex biosorption with a depth participation of carboxylic and hydroxyl groups was revealed by the characterization analyses, whereas the ion exchange mechanism played a really important role. The cation exchange capacity of RES was quantified as 34.12 mg/g(RES) with main exchangeable position of Ca2+ and Na+ ions. Based on these results, RES could be used as a novel and efficient biosorbent for toxic metals removal even from quite diluted real effluents, contributing to its valorization. (AU)

• Processo FAPESP: 14/04050-5 - Avaliação de resíduo da extração de alginato da alga Sargassum filipendula como bioadsorvente em processo de remoção de metais tóxicos
• Beneficiário: Meuris Gurgel Carlos da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/18236-1 - Recuperação de íons metálicos nobres e íons terras-raras presentes em soluções aquosas por bioadsorção em partículas de blenda de sericina e alginato
• Beneficiário: Melissa Gurgel Adeodato Vieira
• Modalidade de apoio: Auxílio à Pesquisa - Regular