2002
DOI: 10.1021/es011038u
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Photocatalytic Degradation of Aqueous 4-Chlorophenol by Silica-Immobilized Polyoxometalates

Abstract: The degradation of 4-chlorophenol with near-UV light by silica-immobilized polyoxometalate (POM-in-SiO2) catalysts has been studied. The silica-immobilized Na6W7O24 (SW7), H4W1032 (SW10), H3PW12O40 (SPW12), and H6P2W18O62 (SP2W18) were prepared by means of the sol-gel hydrothermal technique through the hydrolysis of tetraethoxysilane in aqueous solution of the corresponding polyoxometalate, respectively. The degradation of 4-chlorophenol was monitored by measuring Cl- and CO2 concentrations and analyzing react… Show more

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Cited by 118 publications
(55 citation statements)
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“…Though the free SiW 12 O 40 4− anion dissolved in aqueous solution is unstable and prone to hydrolyze stepwise to form SiO 4 4− and WO 4 2− under circumneutral and alkaline conditions [18], the immobilized SiW 12 O 40 4− anion in water-insoluble Fe III AspSiW seems to be more resistant to hydrolysis. Similar phenomenon was also observed in a silica-immobilized POM catalyst, in which heteropolyanion anchored in SiO 2 matrix was stable in circumneutral medium [24]. Compared with the iron-based materials reported previously, the excellent catalytic activity and reusability at neutral pH make Fe III AspSiW a potential alternative for practical application.…”
Section: Catalytic Performance Of Fe III Aspsiwsupporting
confidence: 78%
“…Though the free SiW 12 O 40 4− anion dissolved in aqueous solution is unstable and prone to hydrolyze stepwise to form SiO 4 4− and WO 4 2− under circumneutral and alkaline conditions [18], the immobilized SiW 12 O 40 4− anion in water-insoluble Fe III AspSiW seems to be more resistant to hydrolysis. Similar phenomenon was also observed in a silica-immobilized POM catalyst, in which heteropolyanion anchored in SiO 2 matrix was stable in circumneutral medium [24]. Compared with the iron-based materials reported previously, the excellent catalytic activity and reusability at neutral pH make Fe III AspSiW a potential alternative for practical application.…”
Section: Catalytic Performance Of Fe III Aspsiwsupporting
confidence: 78%
“…From the Fig.1 (i POMs could be supported as molecules or aggregates on the supports. Fig.1 (ii) [27,36].…”
Section: Catalyst Characterisationmentioning
confidence: 99%
“…[23][24][25] Desta forma, os compostos orgânicos poderão ser degradados pelos radicais hidroxila formados através da reação da lacuna fotogerada com a água adsorvida à superfície do semicondutor 26 e/ou da reação dos elétrons fotoinjetados com o O 2 que formará um ânion radical superóxida, que irá sofrer reações sucessivas até a formação de radicais hidroxila. 24,27 A aplicação de uma densidade de corrente ou de um potencial anódico constante ao fotoânodo, através de um circuito externo, irá permitir a fotogeração de elétrons que serão continuamente extraídos do fotoânodo, melhorando a eficiência do processo. 23 Os semicondutores TiO 2 e ZnO têm sido extensivamente estudados como fotocatalisadores [15][16][17][18][19]28 e fotoeletrocatalisadores 29-31 na degradação de poluentes orgânicos, devido ao seu baixo custo, alta eficiência, baixa toxicidade e alta estabilidade em meio aquoso.…”
Section: Introductionunclassified