Persistent Link:
http://hdl.handle.net/10150/625349
Title:
Chemical and Microbial Processes for Rhodium Recovery
Author:
Zhu, Kechen
Issue Date:
2017
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Embargo:
Release after 15-Jul-2018
Abstract:
This is the first report that demonstrates the ability of anaerobic methanogenic granular sludge to reduce Rh(III) to Rh(0). Recovery of rhodium(Rh) during anaerobic incubations under abiotic and biotic condition with different electron donors was studied. H2 and formate reduced Rh(III) to Rh(0) nanoparticles(NPs) in the absence of microorganisms. However, the presence of microorganism was crucial for Rh(III) reduction with ethanol. Results of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) confirmed the formation of Rh(0) NPs and indicated the localization and morphology of the formed Rh(0) NPs varied with electron donor utilized. Rh(III) reduction with H2 and ethanol obeyed 1st order kinetics. Rh(III) caused a moderate inhibition to methanogenesis. Rh(III) reduction often ceased before coming to completion but this effect is not due to unfavorable thermodynamics. A hypothesis was developed which ascribes the biological reduction of Rh(III) with ethanol as being due to the biological formation of H2 (that subsequently chemically reacts with Rh). The results obtained indicate the potential of utilizing anaerobic granular sludge bioreactor technology as a practical and promising option in Rh(III) recovery.
Type:
text; Electronic Thesis
Keywords:
bio-recovery; rhodium
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Environmental Engineering
Degree Grantor:
University of Arizona
Advisor:
Field, James A.; Sierra-Alvarez, Reyes

Full metadata record

DC FieldValue Language
dc.language.isoen_USen
dc.titleChemical and Microbial Processes for Rhodium Recoveryen_US
dc.creatorZhu, Kechenen
dc.contributor.authorZhu, Kechenen
dc.date.issued2017-
dc.publisherThe University of Arizona.en
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en
dc.description.releaseRelease after 15-Jul-2018en
dc.description.abstractThis is the first report that demonstrates the ability of anaerobic methanogenic granular sludge to reduce Rh(III) to Rh(0). Recovery of rhodium(Rh) during anaerobic incubations under abiotic and biotic condition with different electron donors was studied. H2 and formate reduced Rh(III) to Rh(0) nanoparticles(NPs) in the absence of microorganisms. However, the presence of microorganism was crucial for Rh(III) reduction with ethanol. Results of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) confirmed the formation of Rh(0) NPs and indicated the localization and morphology of the formed Rh(0) NPs varied with electron donor utilized. Rh(III) reduction with H2 and ethanol obeyed 1st order kinetics. Rh(III) caused a moderate inhibition to methanogenesis. Rh(III) reduction often ceased before coming to completion but this effect is not due to unfavorable thermodynamics. A hypothesis was developed which ascribes the biological reduction of Rh(III) with ethanol as being due to the biological formation of H2 (that subsequently chemically reacts with Rh). The results obtained indicate the potential of utilizing anaerobic granular sludge bioreactor technology as a practical and promising option in Rh(III) recovery.en
dc.typetexten
dc.typeElectronic Thesisen
dc.subjectbio-recoveryen
dc.subjectrhodiumen
thesis.degree.nameM.S.en
thesis.degree.levelmastersen
thesis.degree.disciplineGraduate Collegeen
thesis.degree.disciplineEnvironmental Engineeringen
thesis.degree.grantorUniversity of Arizonaen
dc.contributor.advisorField, James A.en
dc.contributor.advisorSierra-Alvarez, Reyesen
dc.contributor.committeememberField, James A.en
dc.contributor.committeememberSierra-Alvarez, Reyesen
dc.contributor.committeememberArnold, Robert G.en
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