Adsorption of gold ions onto sericin and alginate particles chemically crosslinked by proanthocyanidins : a complete fixed-bed column study
Nilza Tatiane das Graças Santos, Richard Landers, Meuris Gurgel Carlos da Silva, and Melissa Gurgel Adeodato Vieira
ARTIGO
Inglês
Abstract: In this study, we evaluated the adsorption of gold ions onto sericin and alginate particles chemically crosslinked by proanthocyanidins (SAPAS) in a fixed-bed column aiming at establishing a new profitable application for sericin. The effects of the feed flow rate and the gold inlet...
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Abstract: In this study, we evaluated the adsorption of gold ions onto sericin and alginate particles chemically crosslinked by proanthocyanidins (SAPAS) in a fixed-bed column aiming at establishing a new profitable application for sericin. The effects of the feed flow rate and the gold inlet concentration on the breakthrough curve behavior were investigated. A breakthrough time of more than four and a half days with a removal efficiency of 98.39% (maximum removal capacity of 57.91 mg/g) was obtained for the breakthrough curve performed at the lowest feed flow rate and the lowest gold inlet concentration (0.4 mL/min and 53.18 mg/L, respectively). All breakthrough curves were best described by the Yan et al. model. The two adsorption/desorption cycles performed using thiourea (0.5 M)/hydrochloric acid (0.5 M) as the eluent resulted in low values of gold recovery percentage (recoveries of 24.98 and 22.6% for the first and second cycle, respectively), which indicated predominance of chemical interactions between SAPAS and gold. On the other hand, an efficient recovery of gold (89.00%) was achieved from the association between the adsorption and incineration processes. X-ray photoelectron spectroscopy and X-ray diffraction analyses indicated that gold was reduced from Au(III) to metallic gold during the adsorption process
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COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
001
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2017/18236-1
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
301401/2016-0
Fechado
Adsorption of gold ions onto sericin and alginate particles chemically crosslinked by proanthocyanidins : a complete fixed-bed column study
Nilza Tatiane das Graças Santos, Richard Landers, Meuris Gurgel Carlos da Silva, and Melissa Gurgel Adeodato Vieira
Adsorption of gold ions onto sericin and alginate particles chemically crosslinked by proanthocyanidins : a complete fixed-bed column study
Nilza Tatiane das Graças Santos, Richard Landers, Meuris Gurgel Carlos da Silva, and Melissa Gurgel Adeodato Vieira
Fontes
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Industrial and engineering chemistry research Vol. 59, n. 1 (Jan., 2020-01), p. 318-328 |