Montmorillonite-supported nanoscale zero-valent iron for removal of arsenic from aqueous solution: Kinetics and mechanism
dc.contributor.author
dc.date.accessioned
2016-01-25T13:28:48Z
dc.date.available
2016-01-25T13:28:48Z
dc.date.issued
2014-05-01
dc.identifier.issn
1385-8947
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dc.description.abstract
Montmorillonite-supported nanoscale zero-valent iron (Mt-nZVI) has been synthesized to remove inorganic arsenic (As) from aqueous solutions. BET, SEM, EDX, XRD and XPS were used to characterize the clay-supported material which consists mainly of core shell Fe(0) structure with an outer oxide/hydroxide shell. The dispersion of nZVI onto montmorillonite was found to be increased with decreasing tendency to agglomerate into larger particles. Batch experiments revealed that adsorption kinetics followed pseudo-second order rate equation with high affinity towards both As(III) and As(V) over a wide pH range (4-8) which was decreased at pH>9. The maximum adsorption capacity calculated from the Langmuir adsorption isotherm was found to be 59.9 and 45.5mgg-1 for As(III) and As(V) respectively at pH 7.0. Although the presence of competing anions like SO42-, HCO3- and NO3- did not show pronounced effect, PO43- had an inhibitory action on the adsorption. The XPS analyses of As-reacted Mt-nZVI indicated the occurrence of surface catalyzed oxidation of As(III) to As(V). The possible regeneration using 0.1M NaOH and performance of Mt-nZVI was investigated by repeating adsorption-elution process. This study has great significance for demonstrating Mt-nZVI as potential adsorbent to reduce elevated levels of As in groundwater
dc.description.sponsorship
panish National Research Programme supported this work through Project CGL2010-22168-C03-03
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application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.relation
info:eu-repo/grantAgreement/MICINN//CGL2010-22168-C03-02/ES/APLICACION DE AGUA NO CONVENCIONAL (TRATADA-DESALADA) Y FANGOS PROCEDENTES DE DEPURADORAS URBANAS Y SU IMPACTO EN EL MEDIO ACUIFERO Y SUELOS. ETUDIOS DE CAMPOY LABORATORIO/
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Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.cej.2013.12.049
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© Chemical Engineering Journal, 2014, vol. 243, p. 14-23
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Articles publicats (D-Q)
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Tots els drets reservats
dc.subject
dc.title
Montmorillonite-supported nanoscale zero-valent iron for removal of arsenic from aqueous solution: Kinetics and mechanism
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/embargoedAccess
dc.embargo.terms
Cap
dc.date.embargoEndDate
info:eu-repo/date/embargoEnd/2026-01-01
dc.type.version
info:eu-repo/semantics/publishedVersion
dc.identifier.doi
dc.identifier.idgrec
023353
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dc.relation.ProjectAcronym