Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 36, Pages 36354-36366Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-019-06731-5
Keywords
Silver; Biosorption; Sargassum; Waste; Acidification; Porosity
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Funding
- Foundation for Research Support of Sao Paulo State, FAPESP [2016/06173-2, 2017/18236-1]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES) [001]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [16/06173-2] Funding Source: FAPESP
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This work investigated the use of acidified dealginated residue from Sargassum filipendula algae for biosorption of silver in fixed bed column. This biosorbent was esterified for carboxyl and sulfonate groups to investigate the influence of these groups on silver removal percentage. Potentiometric titration was also evaluated on acidified and esterified biosorbents. Porosity and specific weight were determined by helium picnometry and mercury porosimetry techniques. The results showed that carboxyl and sulfonate groups were significant on silver biosorption. Potentiometric titration showed that esterified and acidified biosorbents presented different acid groups. The porosity of the acidified biosorbent was around 40%. Fixed bed assays were conducted to evaluate the influence of inlet concentration and feed flow rate of silver. Higher percentage removal of silver was obtained at 1.0 mmol center dot L-1 and 0.5 mL center dot min(-1). Modified dose-response model obtained the best prediction of experimental data among breakthrough curve models.
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