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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
das Gracas Santos, Nilza Tatiane [1] ; Landers, Richard [2] ; Carlos da Silva, Meuris Gurgel [1] ; Adeodato Vieira, Melissa Gurgel [1]
Total Authors: 4
Affiliation:
[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
Total Affiliations: 2
Document type: Journal article
Source: Industrial & Engineering Chemistry Research; v. 59, n. 1, p. 318-328, JAN 8 2020.
Web of Science Citations: 0
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. (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