Nonlinear Modelling of Data Obtained from Photocatalytic Mineralisation of 2,4-Dichlorophenol on a Titanium Dioxide Membrane
Articolo
Data di Pubblicazione:
2009
Citazione:
Nonlinear Modelling of Data Obtained from Photocatalytic Mineralisation of 2,4-Dichlorophenol on a Titanium Dioxide Membrane / I.R. Bellobono, R. Scotti, M. D'Arienzo, F. Morazzoni, R. Bianchi, R. Stanescu, C. Costache, L. Bobirica, G. Cobzaru, P.M. Tozzi. M. Rossi, M.L. Bonardi, F. Groppi, L. Gini. - In: INTERNATIONAL JOURNAL OF PHOTOENERGY. - ISSN 1110-662X. - 2009(2009), pp. 631768.1-631768.10. [10.1155/2009/631768]
Abstract:
Photomineralisation of 2,4-dichlorophenol (DCP) in aqueous solutions (10.0–100.0mg/L of C) was systematically studied at
318 ± 3 K, in an annular laboratory-scale reactor, by photocatalytic membranes immobilizing titanium dioxide, as a function
of substrate concentration, and absorbed power per unit length of membrane. Kinetics of both substrate disappearance, to
yield intermediates, and total organic carbon (TOC) disappearance, to yield carbon dioxide, were followed (first series of
experiments). At a fixed value of irradiance (1.50W cm−1), other series ofmineralization experiments were repeated (second series
of experiments) by carrying out only analyses of chemical oxygen demand (COD), in order to comparemodelling results of the two
sets of experiments. In both sets of experiments, stoichiometric hydrogen peroxide was used as oxygen donor. For the first series
of experiments, a kinetic model was employed, already validated in previous work, from which, by a set of differential equations,
four final optimised parameters, k1 and K1, k2 and K2, were calculated. By these parameters, the whole kinetic profile could be
fitted adequately. The influence of irradiance on k1 and k2 could be rationalised very well by this four-parameter kinetic model.
Modelling of quantum yields, as a function of irradiance, could also be carried out satisfactorily. As has been found previously
for other kinds of substrates, modelling of quantum yields for DCP mineralization is consistent with kinetics of hydroxyl radicals
reacting between themselves, leading to hydrogen peroxide, other than with substrate or intermediates leading finally to carbon
dioxide, paralleled by a second competition kinetics involving superoxide radical anion. For the second series of experiments, on
the contrary, the Langmuir-Hinshelwood model was employed. Uncertainties of COD analyses, coupled with discrepancies of this
model and with its inability to reproduce kinetics up to complete mineralization, are underlined.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Photocatalysis ; Photocatalytic Membranes ; TiO2 Immobilisation ; 2,4-Dichlorophenol Mineralisation ; Nonlinear Modelling ; Mineralisation Kinetics
Elenco autori:
I.R. Bellobono, R. Scotti, M. D'Arienzo, F. Morazzoni, R. Bianchi, R. Stanescu, C. Costache, L. Bobirica, G. Cobzaru, P.M. Tozzi. M. Rossi, M.L. Bonardi, F. Groppi, L. Gini
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