REDUCTIVE/OXIDATIVE TREATMENT WITH SUPERIOR PERFORMANCE RELATIVE TO OXIDATIVE TREATMENT DURING THE DEGRADATION OF 4-CHLOROPHENOL (Articolo in rivista)

Type
Label
  • REDUCTIVE/OXIDATIVE TREATMENT WITH SUPERIOR PERFORMANCE RELATIVE TO OXIDATIVE TREATMENT DURING THE DEGRADATION OF 4-CHLOROPHENOL (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.apcatb.2005.02.014 (literal)
Alternative label
  • RAJA P., BOZZI A., JARDIM W.F., MASCOLO G., RENGANATHAN R., KIWI J. (2005)
    REDUCTIVE/OXIDATIVE TREATMENT WITH SUPERIOR PERFORMANCE RELATIVE TO OXIDATIVE TREATMENT DURING THE DEGRADATION OF 4-CHLOROPHENOL
    in Applied catalysis. B, Environmental (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • RAJA P., BOZZI A., JARDIM W.F., MASCOLO G., RENGANATHAN R., KIWI J. (literal)
Pagina inizio
  • 249 (literal)
Pagina fine
  • 257 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 59 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • a Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology, Lausanne 1015, Switzerland b Institute of Chemistry, UNICAMP, State University of Campinas, Campinas, Sau Paulo, Brazil cWater Research Institute, CNR-IRSA, Via F de Blasio 5, Bari 70123, Italy d Department of Chemistry, Bharathidasan University, Tiruchirappalli, Tamilnadu, India (literal)
Titolo
  • REDUCTIVE/OXIDATIVE TREATMENT WITH SUPERIOR PERFORMANCE RELATIVE TO OXIDATIVE TREATMENT DURING THE DEGRADATION OF 4-CHLOROPHENOL (literal)
Abstract
  • This study obtained information on the effectiveness of the photo-assisted Fenton oxidation of 4-chlorophenol (4-CP) combined with zero-valent pretreatment. The kinetic rate parameters of the process as well as the operating conditions were determined. Homogeneous photo-assisted Fenton enhanced processes lead to ?33% mineralization of 4-chlorophenol (1.25 mM) in solutions containing Fe-ions (2- 10 mg/l) and H2O2 (10 mM) within 2 h under visible light irradiation. When this solution was pretreated with zero-valent Fe (14 g/70 ml) in Ar atmosphere, the mineralization attained levels of >80% after the second stage photo-assisted Fenton process. Intermediates that could be effectively degraded by photo-Fenton reactions were not attained in the absence of zero-valent Fe pretreatment. The pretreatment by zero-valent Fe under light lead to about 70% of the stoichiometric amount of chloride contained in 4-CP. Partial recovery of chloride ions indicated the formation of chloro-intermediates. These intermediates were experimentally detected by high-pressure liquid chromatograph (HPLC)-MS and the most important intermediates were identified. Fenton photo-assisted processes were effective employing very low concentrations of Fe2+(2-5 mg/l) after the pretreatment stage that do not need to be separated after the 4-CP degradation process. This is important for the practical application of the novel combined heterogeneous-homogeneous process. Evidence for the stable catalytic performance of the coupled process to degrade 4-CP is presented. The effect on the 4-CP degradation of Fe-ion, H2O2, 4-CP concentration and gas atmosphere was systematically investigated. The activation energy (Ea) of 2.66 kJ/mol was found for the abatement of 4-CP. (literal)
Prodotto di
Autore CNR

Incoming links:


Prodotto
Autore CNR di
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
data.CNR.it