Organic leaching and metal removal with Sargassum filipendula/Lixiviacao organica e remocao de metais usando Sargassum filipendula

• Published in: Acta scientiarum. Technology Vol. 36; no. 3; p. 429
• Main Authors: Veit, Marcia Teresinha, Goncalves, Gilberto da Cunha, Fagundes-Klen, Marcia Regina, da Silva, Edson Antonio, Tavares, Celia Regina Granhen, Honorio, Jacqueline Ferandin
• Format: Journal Article
• Language: Spanish
• Published: Universidade Estadual de Maringa 01.07.2014
• Subjects: Analysis; Chromium; Leaching; Machining
• ISSN: 1806-2563; 1807-8664
• DOI: 10.4025/actascitechnol.v36i3.18269

The biosorption process with algae is usually carried out with a concomitant alginate leaching process. Alginate is identified as the main functional group, responsible for generating the most active sites. Biomass chemical and thermal pretreatment is an alternative process for reducing organic leaching. Experiments with different pH rates were performed to analyze the leaching process of pretreated (contact time: 24, 48 and 72 hours) and non-pretreated biomass of Sargassum filipendula. The concentrations of calcium, magnesium, sodium and potassium ions, as well as total organic carbon, were determined to evaluate the biomass sorption capacity. Capacities of native and pretreated biomass to remove the heavy metal ions Cr and/or Ni from solutions of different concentrations were compared. The ion competition effect on removal capacity was studied. The biosorbent had a higher affinity with chromium ion. Keywords: biosorption, chromium, nickel, seaweed, total organic carbon. A biossorcao, utilizando algas marinhas, geralmente e acompanhada do processo de lixiviacao de alginatos, identificado como o principal grupo funcional responsavel por disponibilizar a maior parte dos sitios ativos. Uma alternativa para reduzir a lixiviacao e o pre-tratamento quimico e termico da biomassa. Experimentos em diferentes pH foram realizados para analisar a lixiviacao da biomassa de Sargassum filipendula pre-tratada (tempo contato: 24, 48 e 72-h) e in natura. As concentracoes dos ions calcio, magnesio, sodio e potassio bem como do carbono organico total foram determinados para avaliar a capacidade de sorcao da biomassa. A capacidade da biomassa in natura e pre-tratada em remover os ions cromo e/ou niquel nas diferentes concentracoes de solucoes foram comparadas. O efeito de competicao entre os ions foi estudado em relacao a capacidade de remocao, apresentando o biossorvente maior afinidade pelo ion cromo em solucao. Palavras-chave: biossorcao, cromo, niquel, alga marinha, carbono organico total.