Environmental photocatalytic processes with POM. The photodecomposition of atrazine and photoreduction of metal ions from aqueous solutions

Hiskia, A; Troupis, A; Papaconstantinou, E

dc.contributor.author	Hiskia, A	en
dc.contributor.author	Troupis, A	en
dc.contributor.author	Papaconstantinou, E	en
dc.date.accessioned	2014-03-01T01:17:48Z
dc.date.available	2014-03-01T01:17:48Z
dc.date.issued	2002	en
dc.identifier.issn	1110-662X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14679
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-52649146952&partnerID=40&md5=fdc467e732645a0b4c260ed40f76bf73	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Optics	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.title	Environmental photocatalytic processes with POM. The photodecomposition of atrazine and photoreduction of metal ions from aqueous solutions	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	Polyoxometalate anions (POM), resulting from the condensation of tungstate anions in strongly acidified solutions, can absorb efficiently light in the UV-near Vis region. The produced excited state is a very powerful oxidative reagent which can, mainly via OH radical attack, oxidize and mineralize a great variety of organic pollutants in aqueous solutions, while the photocatalytic circle is closed by reoxidation of the reduced POM, mainly, by O-2. Metal ions can also serve as oxidants and close the photocatalytic cycle. In the process metal ions are reduced, precipitated and removed from the solution. Thus photocatalytic treatment for decontamination of waste waters from both organic and inorganic pollutants ( metal ions) can be, in principle, achieved. POM + S (hv)under right arrow POMred + S-ox, POMred + Mn+ --> POM + M-red. Atrazine, a widely used herbicide with s-triazine structure, is photodecomposed to cyanuric acid in presence of SiW12O404- in aqueous solutions. However, no precipitation of metal ions is obtained when atrazine is the sole organic substrate in aqueous solutions. The low solubility of atrazine produces insufficient concentration of reduced POM to cause precipitation.	en
heal.publisher	PHOTOENERGY CENTER AIN SHAMS UNIV,	en
heal.journalName	International Journal of Photoenergy	en
dc.identifier.isi	ISI:000178757200006	en
dc.identifier.volume	4	en
dc.identifier.issue	1	en
dc.identifier.spage	34	en
dc.identifier.epage	40	en