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dc.contributor.author | Igboamalu, Tony Ebuka![]() |
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dc.contributor.author | Nyakale, Atlegang![]() |
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dc.contributor.author | Matsena, Mpumelelo Thomas![]() |
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dc.contributor.author | Chirwa, Evans M.N.![]() |
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dc.date.accessioned | 2021-06-18T13:28:00Z | |
dc.date.available | 2021-06-18T13:28:00Z | |
dc.date.issued | 2020 | |
dc.description.abstract | Biocatalytic oxidation of Arsenite (As3+) to arsenate (As5+) in a mobilized and immobilized chemoautotrophic bacterium has been a challenging area of metallic bioremediation research. This is because arsenic in its trivalent form (As(III)) is a major water pollutant and a threat to the human health and the environment. Previous studies have shown that Gram-positive species: Bacillus sp., and Exiguobacterium sp, has the tendency to biologically catalyse or mediate the oxidation of As3+ to As5+. The redox process is believed to be thermodynamic feasible because of the Mo6+ content of the microbial cell sub unit, acting as an electron acceptor for As3+ oxidation with adequate amount of energy generated for cell growth and metabolism. The changes in arsenic oxidation state (i.e. +3 to +5) is a natural process, and it is not well understood. However, the current study investigates or validate the changes in oxidation state of arsenic from +3 to +5 in a mobilized cell at various Oxidation Reduction Potential (ORP) and pH subjected to different arsenic concentrations ranging from 50 mg/L to 100 mg/L. It was observed that there exists a proportional relationship between increasing the arsenic concentration and achieving high ORP values. The maximum ORP achieved in the anaerobic batch experiment increased from -15.9 mV at 50 mg/L, to -14.8 mV at 80 mg/L and to -12.5 mV at 100 mg/L. It was evident that the ORP increased at 100 mg/L from -16.1 mV to -12.5 mV, indicating possible electron switch. Arsenic oxidation was highly favoured in anaerobic conditions than in aerobic conditions. | en_ZA |
dc.description.department | Chemical Engineering | en_ZA |
dc.description.librarian | pm2021 | en_ZA |
dc.description.uri | https://www.cetjournal.it/index.php/cet | en_ZA |
dc.identifier.citation | Igboamalu T.E., Nyakale A., Matsena M., Chirwa E.M., 2020, Effect of Oxidation Reduction Potential (eh) on the Biocatalytic Oxidation of As3+ to As5+ in a Mixed Culture of Chemoautotrophic Bacteria, Chemical Engineering Transactions, 79, 301-306. DOI:10.3303/CET2079051. | en_ZA |
dc.identifier.issn | 2283-9216 (online) | |
dc.identifier.other | 10.3303/CET2079051 | |
dc.identifier.uri | http://hdl.handle.net/2263/80376 | |
dc.language.iso | en | en_ZA |
dc.publisher | Italian Association of Chemical Engineering | en_ZA |
dc.rights | © 2020, AIDIC Servizi S.r.l. | en_ZA |
dc.subject | Biocatalytic oxidation | en_ZA |
dc.subject | Arsenite (As3+) | en_ZA |
dc.subject | Arsenate (As5+) | en_ZA |
dc.subject | Chemoautotrophic bacterium | en_ZA |
dc.subject | Metallic bioremediation | en_ZA |
dc.subject | Oxidation reduction | en_ZA |
dc.title | Effect of oxidation reduction potential (Eh) on the biocatalytic oxidation of As3+ to As5+ in a mixed culture of chemoautotrophic bacteria | en_ZA |
dc.type | Article | en_ZA |