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

Author(s)

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

• Document type: Journal article
• Source: JOURNAL OF CLEANER PRODUCTION; v. 271, p. 8-pg., 2020-10-20.

Abstract

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)

• FAPESP's process: 17/18236-1 - RECOVERY OF NOBLE METALLIC IONS AND RARE-EARTH IONS FROM AQUEOUS SOLUTIONS BY BIOADSORTION IN PARTICLES PRODUCED FROM SERICINE AND ALGINATE BLENDS
• Grantee: Melissa Gurgel Adeodato Vieira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/06173-2 - Removal of silver and copper ions by biosorption residue of marine alginate extraction
• Grantee: Geovani Rocha de Freitas
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 14/04050-5 - Evaluation of the residue of the extraction of alginate from the seaweed Sargassum filipendula as bioadsorbent forremoval of toxic metals
• Grantee: Meuris Gurgel Carlos da Silva
• Support Opportunities: Regular Research Grants