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Photochemical reduction of chromium(VI) by phenol and its halogen derivatives

Photochemical reduction of chromium(VI) by phenol ...

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dc.contributor.author Mytych, Piotr pl
dc.contributor.author Stasicka, Zofia pl
dc.date.accessioned 2015-01-26T15:29:58Z
dc.date.available 2015-01-26T15:29:58Z
dc.date.issued 2004 pl
dc.identifier.issn 0926-3373 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/2759
dc.language eng pl
dc.title Photochemical reduction of chromium(VI) by phenol and its halogen derivatives pl
dc.type JournalArticle pl
dc.description.physical 167-172 pl
dc.abstract.en Photoreduction of chromium(VI) has been investigated in solutions containing phenol or monohalogenophenol (4-bromophenol, 4-chlorophenol and 3-chlorophenol) under conditions mimicking the environmental ones. The effects of radiation wavelength, pH and molecular oxygen are analysed. The results show that chromate(VI) in excited state is reduced by phenol in its ground state via photoinduced electron transfer (PET). Moreover, solvated electrons generated by the phenol photoreaction reduce the CrO42− anions in their ground state. Phenol oxidation in both processes is assumed to proceed via generation of the C6H5Oradical dot radicals, which participate in further redox processes. Acidic and anoxic conditions favour the Cr(VI) photoreduction, whereas alkaline oxygenated solutions are preferable for phenol photooxidation followed by Cr(VI) thermal reduction by means of esolv−. Bromophenol appears more readily photodegradated, whereas chlorophenols are more resistant to it than unsubstituted phenol. The system consisting of chromate(VI) and phenol demonstrates the synergetic photodegradation as the phenolic substance enables photoreduction of environmental Cr(VI) and vice versa the Cr(VI) pollutant enhances photooxidation of phenol and its derivatives. pl
dc.subject.en chromate(VI) pl
dc.subject.en phenol pl
dc.subject.en monohalogenophenols pl
dc.subject.en photoinduced electron transfer (PET) pl
dc.subject.en photoreduction pl
dc.subject.en photodegradation pl
dc.subject.en environmental self-cleaning pl
dc.description.volume 52 pl
dc.description.number 3 pl
dc.identifier.doi 10.1016/j.apcatb.2004.04.006 pl
dc.identifier.eissn 1873-3883 pl
dc.title.journal Applied Catalysis. B, Environmental pl
dc.language.container eng pl
dc.affiliation Wydział Chemii : Zakład Chemii Nieorganicznej pl
dc.subtype Article pl
dc.rights.original bez licencji pl


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