Imogolite prepared from cement kiln dust removes arsenite from water

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datacite.alternateIdentifier.citationENVIRONMENTAL TECHNOLOGY & INNOVATION,Vol.31,,2023
datacite.alternateIdentifier.doi10.1016/j.eti.2023.103142
datacite.creatorGonzalez, Aixa
datacite.creatorManquian Cerda, Karen
datacite.creatorMaldonado, Tamara
datacite.creatorCalderon, Raul
datacite.creatorSarkar, Binoy
datacite.creatorArancibia Miranda, Nicolas
datacite.date2023
datacite.subject.englishCement kiln dust
datacite.subject.englishAlkali-dissolution
datacite.subject.englishImogolite
datacite.subject.englishArsenic
datacite.subject.englishAdsorption
datacite.subject.englishWaste valorization
datacite.titleImogolite prepared from cement kiln dust removes arsenite from water
dc.date.accessioned2023-06-08T15:48:10Z
dc.date.available2023-06-08T15:48:10Z
dc.description.abstractImogolite belongs to the family of nanotubular metal oxides which are useful for the construction of new materials in nanotechnology. This study aims to develop a simple waste valorization method to obtain imogolite from cement kiln dust (CKD) via solubilization of CKD and subsequent precipitation of imogolite (Imo-CKD) in a hydrothermal process. The newly synthesized Imo-CKD and a conventional imogolite (Imo) showed similar diameter (0) and length (L) of nanotubes [0 similar to= 1.9 nm and L similar to= 200 nm] and crystallinity grade but different values of isoelectric point (IEP) [IEPImo-CKD = 8.86 and IEPImo = 9 .92]. The shift in the IEP value of Imo-CKD to a lower value was attributed to the presence of allophane as a subproduct during Imo-CKD synthesis. Arsenite [As(III)] removal from water by both the imogolites was a rapid (t <= 20 min) and spontaneous process. The kinetic As(III) removal data obeyed the pseudo-second order model, while surface diffusion also controlled the As(III) adsorption process. The activation energy (Ea > 40 kJ mol-1) suggested a chemical adsorption of As(III) in both materials. The Imo-CKD (0.377 mmol g-1) removed As(III) from water more efficiently than Imo (0.334 mmol g-1), despite the formation of allophane byproduct in the synthesis process. Results of this study can promote the reuse of inexpensive CKD as a viable alternative to replace costly tetraethyl orthosilicate for imogolite synthesis and use of imogolite for water pollutant removal.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.identifier.urihttps://repositoriodigital.uct.cl/handle/10925/5263
dc.language.isoen
dc.publisherELSEVIER
dc.sourceENVIRONMENTAL TECHNOLOGY & INNOVATION
oaire.resourceTypeArticle
uct.indizacionSCI
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