Role of reactor type on Cr(VI) removal by zero-valent iron in the presence of pyrite: Batch versus sequential batch reactors

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dc.authoridKantar, Cetin/0000-0001-9747-9115
dc.contributor.authorOral, Ozlem
dc.contributor.authorYigit, Aynur
dc.contributor.authorKantar, Cetin
dc.date.accessioned2025-01-27T20:14:25Z
dc.date.available2025-01-27T20:14:25Z
dc.date.issued2022
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThis study was conducted to understand the role of application sequence of pyrite and zero-valent iron (Fe0) (simultaneous vs. sequential) on chromium (VI) removal by Fe0. In batch experiments, pyrite and Fe0 were homogeneously mixed in batch reactors maintained at a constant total solids loading of 2 g L-1. In sequential batch experiments, however, the first reactor containing variable doses of pyrite was operated for 20 min, and the liquid fraction from the first reactor was then subsequently loaded into the second reactor containing a fixed Fe0 dose of 1.2 g L-1. The batch reactors achieved much higher Cr(VI) removal efficiency than sequential batch reactors under similar operating conditions due to discrepancies in Fe redox cycling activities between these two systems. In batch reactors, the Fe0 particles deposited on pyrite surface due to electrostatic attraction between negatively charged pyrite and positively charged Fe0, thus, rendering the overall solids surface charge neutral at optimum pyrite and Fe0 doses. As a result, the whole system behaved like a composite material, with pyrite functioning as a support material for Fe0. This stimulated Fe redox cycling more effectively to generate new Fe(II) sites on Fe0 for enhanced Cr(VI) removal relative to Fe0 only system. In sequential batch reactors, however, the Fe redox cycling activity was limited, but significantly increased with increasing pyrite dose in the first reactor. Overall, our results indicate that the stimulatory effect of pyrite on Cr(VI) removal by Fe0 may be much higher if the reactors are operated in batch mode.
dc.description.sponsorshipScientific Research Division at Canakkale Onsekiz Mart University; [FYL-2021-3634]
dc.description.sponsorshipAcknowledgments This work was supported by the Scientific Research Division at Canakkale Onsekiz Mart University under the project number of FYL-2021-3634. We?d also like to thank Etibakir Co for providing us with the pyrite concentrate samples.
dc.identifier.doi10.1016/j.jenvman.2022.115854
dc.identifier.issn0301-4797
dc.identifier.issn1095-8630
dc.identifier.pmid35961140
dc.identifier.scopus2-s2.0-85135686498
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.jenvman.2022.115854
dc.identifier.urihttps://hdl.handle.net/20.500.12428/21085
dc.identifier.volume320
dc.identifier.wosWOS:000880015100006
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherAcademic Press Ltd- Elsevier Science Ltd
dc.relation.ispartofJournal of Environmental Management
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectZero-valent iron
dc.subjectPyrite
dc.subjectChromium
dc.subjectBatch reactor
dc.subjectSequential batch reactor
dc.titleRole of reactor type on Cr(VI) removal by zero-valent iron in the presence of pyrite: Batch versus sequential batch reactors
dc.typeArticle

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