Comparison of different chelating agents to enhance reductive Cr(VI) removal by pyrite treatment procedure

Basit Öğe Kaydı
dc.authoridKantar, Cetin/0000-0001-9747-9115
dc.contributor.authorKantar, Cetin
dc.contributor.authorAri, Cihan
dc.contributor.authorKeskin, Selda
dc.date.accessioned2025-01-27T20:35:11Z
dc.date.available2025-01-27T20:35:11Z
dc.date.issued2015
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractNew technologies involving in-situ chemical hexavalent chromium [Cr(VI)] reduction to trivalent chromium [Cr(III)] with natural Fe(II)-containing minerals can offer viable solutions to the treatment of wastewater and subsurface systems contaminated with Cr(VI). Here, the effects of five different chelating agents including citrate, EDTA, oxalate, tartrate and salicylate on reductive Cr(VI) removal from aqueous systems by pyrite were investigated in batch reactors. The Cr(VI) removal was highly dependent on the type of ligand used and chemical conditions (e.g., ligand concentration). While salicylate and EDTA had no or little effect on Cr(VI) removal, the ligands including citrate, tartrate and oxalate significantly enhanced Cr(VI) removal at pH < 7 relative to non-ligand systems. In general, the efficiency of organic ligands on Cr(VI) removal decreased in the order: citrate >= oxalate tartrate approximate to EDTA > salicylate approximate to non-ligand system. Organic ligands enhanced Cr(VI) removal by 1) removing surface oxide layer via the formation of soluble Fe-Cr-ligand complexes, and 2) enhancing the reductive iron redox cycling for the regeneration of new surface sites. While citrate, oxalate and tartrate eliminated the formation of surface Cr (III) Fe(III)-oxides, the surface phase Cr (III) species was observed in the presence of EDTA and salicylate indicating that Cr(III) complexed with EDTA and salicylate sorbed or precipitated onto pyrite surface, thereby blocking the access of Cr-4(2-) to pyrite surface. The binding of Fe(III) with the disulfide reactive sites (equivalent to Fe-S-S-Fe(III)) was essential for the regeneration of new surface sites through pyrite oxidation. Although Fe(III)-S species was detected at the pyrite surface in the presence of citrate, oxalate and tartrate, Fe(III) complexed with EDTA and salicylate did not strongly interact with the disulfide reactive sites due to the formation of non-sorbing Fe(III)-ligand complexes. The absence of surface Fe(III)-S species indicated that no new reactive sites were generated through Fe redox cycling in the presence of salicylate and EDTA. (C) 2015 Elsevier Ltd. All rights reserved.
dc.description.sponsorshipScientific and Technological Research Council of Turkey [110Y293]
dc.description.sponsorshipWe'd like to thank the Scientific and Technological Research Council of Turkey (Project No: 110Y293) for the financial support.
dc.identifier.doi10.1016/j.watres.2015.02.058
dc.identifier.endpage75
dc.identifier.issn0043-1354
dc.identifier.pmid25792435
dc.identifier.scopus2-s2.0-84925015147
dc.identifier.scopusqualityQ1
dc.identifier.startpage66
dc.identifier.urihttps://doi.org/10.1016/j.watres.2015.02.058
dc.identifier.urihttps://hdl.handle.net/20.500.12428/23592
dc.identifier.volume76
dc.identifier.wosWOS:000354341500007
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofWater Research
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectPyrite
dc.subjectChromium
dc.subjectOrganic ligands
dc.subjectComplexation
dc.subjectTreatment
dc.subjectOxidation
dc.titleComparison of different chelating agents to enhance reductive Cr(VI) removal by pyrite treatment procedure
dc.typeArticle

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu
PubMed İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu