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dc.contributor.author
Litter, Marta Irene
dc.date.available
2018-07-03T14:45:08Z
dc.date.issued
2015-06
dc.identifier.citation
Litter, Marta Irene; Mechanisms of removal of heavy metals and arsenic from water by TiO2-heterogeneous photocatalysis; De Gruyter; Pure and Applied Chemistry; 87; 6; 6-2015; 557-567
dc.identifier.issn
0033-4545
dc.identifier.uri
http://hdl.handle.net/11336/51000
dc.description.abstract
This article is an overview of recent work performed in our laboratory on TiO2 heterogeneous photocatalysis of aqueous systems containing toxic forms of chromium, arsenic, lead, uranium and mercury. The cases of chromium and arsenic are treated in profundity. Photocatalytic treatments can convert the ionic species into their metallic solid form and deposit them over the semiconductor surface, or transform them into less toxic soluble species. When a transformation to the zerovalent state is possible, this allows the recovery of the metal from the waters, with an important economical return. Three types of mechanisms can be considered, all of them taking place through successive thermodynamically allowed monoelectronic electron transfer steps: (a) direct reduction by photogenerated electrons; (b) indirect reduction by intermediates generated by hole or hydroxyl radical oxidation of electron donors (reducing radicals); (c) oxidative removal by holes or hydroxyl radicals. Fundamentals of oxidative or reductive heterogeneous photocatalysis are described, with special emphasis on the role of organic donors present in the medium acting as synergists. This indicates the possibility of simultaneous treatment of pollutants of different chemical structure and properties present in the same medium.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
De Gruyter
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Arsenic
dc.subject
Chromium
dc.subject
Heavy Metals
dc.subject
Metalloids
dc.subject
Photocatalysis
dc.subject
Xxv Iupac Photochemistry
dc.subject.classification
Otras Ciencias Químicas
dc.subject.classification
Ciencias Químicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Mechanisms of removal of heavy metals and arsenic from water by TiO2-heterogeneous photocatalysis
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-07-03T13:50:58Z
dc.identifier.eissn
1365-3075
dc.journal.volume
87
dc.journal.number
6
dc.journal.pagination
557-567
dc.journal.pais
Alemania
dc.description.fil
Fil: Litter, Marta Irene. Universidad Nacional de San Martín. Instituto de Investigación en Ingeniería Ambiental; Argentina. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Pure and Applied Chemistry
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1515/pac-2014-0710
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.degruyter.com/view/j/pac.2015.87.issue-6/pac-2014-0710/pac-2014-0710.xml
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