Preliminary study on desorption of gold Ions on self- flocculating microalga and its regeneration potential

Show simple item record Shen, Na Chirwa, Evans M.N. 2018-09-21T07:43:42Z 2018-09-21T07:43:42Z 2018
dc.description.abstract Microalga, possessing high binding affinity to different metals, has been considered as a promising biosorbent. Precious metals recovery and adsorbent regeneration are important for the financial competitiveness of biosorption with other processes. In this study, the desorbing agent thiourea was studied at different concentrations, contact time, pH and temperatures to optimize gold elution from the self-flocculating microalgae Scenedesmus obliquus AS-6-1. The variation in desorption performance with the adsorption time was also investigated. The gold-loaded biomass of S. obliquus AS-6-1 was regenerated efficiently by 0.2 M of thiourea at 25 ℃ and pH of 1.0 within 15 minutes. The adsorption time had significant effect on subsequent desorption, with a decrease in desorption efficiency with an increase in adsorption time. S. obliquus AS-6-1 as biosorbent remained efficient biosorption and desorption potential for gold(III) recovery in the first two adsorption/desorption cycles. The microalga cells could be harvested/separated from solutions by their gravity sedimentation. However, more studies are still required to enhance the regeneration of S. obliquus AS-6-1 by improving its flocculating property. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.librarian am2018 en_ZA
dc.description.sponsorship The Sedibeng Water, South Africa and the Water Utilization and Environmental Engineering Division at the University of Pretoria. en_ZA
dc.description.uri en_ZA
dc.identifier.citation Shen N., Chirwa E., 2018, Preliminary study on desorption of gold ions on self-flocculating microalga and its regeneration potential, Chemical Engineering Transactions, 65, 829-834 DOI: 10.3303/CET1865139. en_ZA
dc.identifier.issn 2283-9216 (online)
dc.identifier.other 10.3303/CET1865139
dc.language.iso en en_ZA
dc.publisher The Italian Association of Chemical Engineering en_ZA
dc.rights © 2018, AIDIC Servizi S.r.l. en_ZA
dc.subject Metals en_ZA
dc.subject Microalga en_ZA
dc.subject Adsorption time en_ZA
dc.subject Gold compounds en_ZA
dc.subject Scenedesmus obliquus en_ZA
dc.subject Gravity sedimentation en_ZA
dc.subject Financial competitiveness en_ZA
dc.subject Desorption potentials en_ZA
dc.subject Desorption efficiency en_ZA
dc.subject Binding affinities en_ZA
dc.subject Adsorbent regeneration en_ZA
dc.subject Thioureas en_ZA
dc.subject Metal recovery en_ZA
dc.subject Flocculation en_ZA
dc.subject Biosorption en_ZA
dc.subject Binding energy en_ZA
dc.subject Algae en_ZA
dc.title Preliminary study on desorption of gold Ions on self- flocculating microalga and its regeneration potential en_ZA
dc.type Article en_ZA

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