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Degradation of organic water pollutants through sonophotocatalysis in the presence of TiO(2).
Ultrason Sonochem. 2003 Jul; 10(4-5):247-54.US

Abstract

The degradation of 2-chlorophenol and of the two azo dyes acid orange 8 and acid red 1 in aqueous solution was investigated kinetically under sonolysis at 20 kHz and under photocatalysis in the presence of titanium dioxide particles, as well as under simultaneous sonolysis and photocatalysis, i.e. sonophotocatalysis. The influence on the degradation and mineralisation rates of the initial substrate concentration and of the photocatalyst amount was systematically investigated to ascertain the origin of the synergistic effect observed between the two degradation techniques. The evolution of hydrogen peroxide during kinetic runs was also monitored. Small amounts of Fe(III) were found to affect both the adsorption equilibria on the semiconductor and the degradation paths. Ultrasound may modify the rate of photocatalytic degradation by promoting the deaggregation of the photocatalyst, by inducing the desorption of organic substrates and degradation intermediates from the photocatalyst surface and, mainly, by favouring the scission of the photocatalytically and sonolytically produced H(2)O(2), with a consequent increase of oxidising species in the aqueous phase.

Authors+Show Affiliations

Dipartimento di Chimica Fisica ed Elettrochimica, Università di Milano, Via Golgi 19, I-20133 Milano, Italy.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12818390

Citation

Mrowetz, Marta, et al. "Degradation of Organic Water Pollutants Through Sonophotocatalysis in the Presence of TiO(2)." Ultrasonics Sonochemistry, vol. 10, no. 4-5, 2003, pp. 247-54.
Mrowetz M, Pirola C, Selli E. Degradation of organic water pollutants through sonophotocatalysis in the presence of TiO(2). Ultrason Sonochem. 2003;10(4-5):247-54.
Mrowetz, M., Pirola, C., & Selli, E. (2003). Degradation of organic water pollutants through sonophotocatalysis in the presence of TiO(2). Ultrasonics Sonochemistry, 10(4-5), 247-54.
Mrowetz M, Pirola C, Selli E. Degradation of Organic Water Pollutants Through Sonophotocatalysis in the Presence of TiO(2). Ultrason Sonochem. 2003;10(4-5):247-54. PubMed PMID: 12818390.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Degradation of organic water pollutants through sonophotocatalysis in the presence of TiO(2). AU - Mrowetz,Marta, AU - Pirola,Carlo, AU - Selli,Elena, PY - 2003/6/24/pubmed PY - 2003/6/24/medline PY - 2003/6/24/entrez SP - 247 EP - 54 JF - Ultrasonics sonochemistry JO - Ultrason Sonochem VL - 10 IS - 4-5 N2 - The degradation of 2-chlorophenol and of the two azo dyes acid orange 8 and acid red 1 in aqueous solution was investigated kinetically under sonolysis at 20 kHz and under photocatalysis in the presence of titanium dioxide particles, as well as under simultaneous sonolysis and photocatalysis, i.e. sonophotocatalysis. The influence on the degradation and mineralisation rates of the initial substrate concentration and of the photocatalyst amount was systematically investigated to ascertain the origin of the synergistic effect observed between the two degradation techniques. The evolution of hydrogen peroxide during kinetic runs was also monitored. Small amounts of Fe(III) were found to affect both the adsorption equilibria on the semiconductor and the degradation paths. Ultrasound may modify the rate of photocatalytic degradation by promoting the deaggregation of the photocatalyst, by inducing the desorption of organic substrates and degradation intermediates from the photocatalyst surface and, mainly, by favouring the scission of the photocatalytically and sonolytically produced H(2)O(2), with a consequent increase of oxidising species in the aqueous phase. SN - 1350-4177 UR - https://www.unboundmedicine.com/medline/citation/12818390/Degradation_of_organic_water_pollutants_through_sonophotocatalysis_in_the_presence_of_TiO_2__ DB - PRIME DP - Unbound Medicine ER -
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