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Characterization of selectively etched halloysite nanotubes by acid treatment

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Characterization of selectively etched halloysite nanotubes by acid treatment

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dc.contributor.author Garcia-Garcia, D. es_ES
dc.contributor.author Ferri, J.M. es_ES
dc.contributor.author Ripoll, L. es_ES
dc.contributor.author Hidalgo, M. es_ES
dc.contributor.author López-Martínez, Juan es_ES
dc.contributor.author Balart, Rafael es_ES
dc.date.accessioned 2018-06-07T04:31:33Z
dc.date.available 2018-06-07T04:31:33Z
dc.date.issued 2017 es_ES
dc.identifier.issn 0169-4332 es_ES
dc.identifier.uri http://hdl.handle.net/10251/103510
dc.description.abstract [EN] Halloysite nanotubes (HNTs) are a type of naturally occurring inorganic nanotubes that are characterized by a different composition between their external and internal walls. The internal walls are mainly composed of alumina whilst external walls are composed of silica. This particular structure offers a dual surface chemistry that allows different selective surface treatments which can be focused on increasing the lumen, increasing porosity, etc. In this work, HNTs were chemically treated with different acids (sulphuric, acetic and acrylic acid), for 72 h at a constant temperature of 50 °C. As per the obtained results, the treatment with sulphuric acid is highly aggressive and the particular shape of HNTs is almost lost, with a remarkable increase in porosity. The BET surface area increases from 52.9 (untreated HNTs) up to 132.4 m2 g−1 with sulphuric acid treatment, thus showing an interesting potential in the field of catalysis. On the other hand, the treatment with acetic acid led to milder effects with a noticeable increase in the lumen diameter that changed from 13.8 nm (untreated HNTs) up to 18.4 nm which the subsequent increase in the loading capacity by 77.8%. The aluminium content was measured by X-ray fluorescence (XRF) and laser induced breakdown spectroscopy (LIBS). The final results using two systems, suggest a good correlation between the acid strength and the aluminium reduction. Consequently, is possible to conclude that new applications for HNTs can be derived from selective etching with acids. Sulphuric acid widens the potential of HNTs in the field of catalysis while weak acids such as acetic and acrylic acids give a controlled and homogeneous lumen increase with the corresponding increase in the loading capacity. es_ES
dc.description.sponsorship This work was supported by the Ministry of Economy and Competitiveness - MINECO [MAT2014-59242-C2-1-R]. D. Garcia-Garcia wants to thanks the Spanish Ministry of Education, Culture and Sports for their financial support through an FPU grant [FPU13/06011].
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation MINISTERIO DE ECONOMIA INDUSTRIA Y COMPETITIVIDAD /MAT2014-59242-C2-1-R-AR es_ES
dc.relation MINISTERIO DE EDUCACION /AP2013-06011 es_ES
dc.relation.ispartof Applied Surface Science es_ES
dc.rights Reconocimiento - No comercial - Sin obra derivada (by-nc-nd) es_ES
dc.subject Halloysite nanotubes es_ES
dc.subject Lumen enlargement es_ES
dc.subject Acid treatment es_ES
dc.subject Catalysis es_ES
dc.subject LIBS. es_ES
dc.subject.classification CIENCIA DE LOS MATERIALES E INGENIERIA METALURGICA es_ES
dc.title Characterization of selectively etched halloysite nanotubes by acid treatment es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.apsusc.2017.06.104 es_ES
dc.rights.accessRights Embargado es_ES
dc.date.embargoEndDate 2019-11-15 es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto de Tecnología de Materiales - Institut de Tecnologia de Materials es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ingeniería Mecánica y de Materiales - Departament d'Enginyeria Mecànica i de Materials es_ES
dc.description.bibliographicCitation Garcia-Garcia, D.; Ferri, J.; Ripoll, L.; Hidalgo, M.; López-Martínez, J.; Balart, R. (2017). Characterization of selectively etched halloysite nanotubes by acid treatment. Applied Surface Science. 422:616-625. doi:10.1016/j.apsusc.2017.06.104 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://doi.org/10.1016/j.apsusc.2017.06.104 es_ES
dc.description.upvformatpinicio 616 es_ES
dc.description.upvformatpfin 625 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 422 es_ES
dc.relation.pasarela 338753 es_ES
dc.contributor.funder MINISTERIO DE EDUCACION es_ES
dc.contributor.funder MINISTERIO DE ECONOMIA INDUSTRIA Y COMPETITIVIDAD es_ES


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