Adsorption of Gold Ions onto Sericin and Alginate Particles Chemically Crosslinked by Proanthocyanidins: a Complete Fixed-Bed Column Study

Autor(es)

das Gracas Santos, Nilza Tatiane ^[1] ; Landers, Richard ^[2] ; Carlos da Silva, Meuris Gurgel ^[1] ; Adeodato Vieira, Melissa Gurgel ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Sch Chem Engn, Cidade Univ Zeferino Vaz, BR-13083852 Campinas, SP - Brazil

^[2] Univ Campinas UNICAMP, Inst Phys Gleb Wataghin, Cidade Univ Zeferino Vaz, BR-13083852 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Industrial & Engineering Chemistry Research; v. 59, n. 1, p. 318-328, JAN 8 2020.
• Citações Web of Science: 0

Resumo

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. (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