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Recovery of gold from aqueous solutions by taurine modified cellulose: An adsorptive-reduction pathway

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Title
Recovery of gold from aqueous solutions by taurine modified cellulose: An adsorptive-reduction pathway
Author
Dwivedi, Amarendra DharDubey, Shashi PrabhaHokkanen, SannaFallah, Rahimeh NaviriSillanpaa, Mika
Keywords
Adsorptive-reduction; Cellulose; Desorption; Gold; Green recovery
Issue Date
201411
Publisher
ELSEVIER SCIENCE SA
Citation
CHEMICAL ENGINEERING JOURNAL, v.255, no., pp.97 - 106
Abstract
The aim of the study was to develop green techniques to recover precious gold by the taurine-modified cellulose (TDAC samples) from the aqueous solution. Adsorption, followed by reduction offered a method for the recovery of ionic and zerovalent gold. The spherical gold nanoparticles (5. nm average size) were investigated in the nanoparticle-embedded gel. Potential rate controlling steps of chemical reactions are modeled by the best-fit of thermodynamic (an endothermic process), kinetic curve (pseudo second order), and isotherm (Sips and 34.5. mg/g Langmuir adsorption capacity) parameters. The pH (2-6) and competing heavy metals (Cd, Co, Cr, Ni, and As) showed least interference, however, gold recovery altered at the high ionic strength (as NaCl). A complexing agent (acidic thiourea) desorbed 86% of ionic gold and pyro-crystallization technique yielded 90% metallic gold. The characterization including X-ray photoelectron spectroscopy detected metallic gold on the surface of TDAC, supporting the adsorptive-reduction mechanism. Performance characteristic of TDAC to concentrate gold in various forms can be viewed as a controllable technique in the water treatment applications.
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DOI
http://dx.doi.org/10.1016/j.cej.2014.06.017
ISSN
1385-8947
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