Characterization and biosorption of silver by biomass waste from the alginate industry

Autor(es)

de Freitas, Geovani Rocha ; Adeodato Vieira, Melissa Gurgel ; Carlos da Silva, Meuris Gurgel

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CLEANER PRODUCTION; v. 271, p. 8-pg., 2020-10-20.

Resumo

In this work, biosorption of silver by a waste product from the alginate production industry was investigated. The biosorbent was submitted to treatment with nitric acid and experiments were performed using the non-acidified and acidified biosorbent. The results showed that the acidification was a successful step to enhance the silver biosorption. SEM micrographs showed the presence of diatoms in the outer structure of the biosorbent, and the sodium ion concentration was reduced after silver uptake. The kinetic experiments revealed that stationary phase was reached after 300 min, while the kinetic curves presented a hump of Ag(I) removal, which is related to the presence of the ion exchange mechanism. The silver biosorption capacity verified for the acidified biosorbent at 293 K was 2.92 mmol g(-1), and the isotherms at 313 K could be described by the Ion Exchange model. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• 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
• Processo FAPESP: 16/06173-2 - Remoção de íons prata e cobre por bioadsorção em resíduo da extração de alginato de alga marinha
• Beneficiário: Geovani Rocha de Freitas
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• 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