Reference : Kinetic study of p-nitrophenol photodegradation with modified TiO2 xerogels
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Engineering, computing & technology : Chemical engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/118832
Kinetic study of p-nitrophenol photodegradation with modified TiO2 xerogels
English
Tasseroul, Ludivine mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces >]
Pirard, Sophie mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Lambert, Stéphanie mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Páez Martínez, Carlos mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Poelman, Dirk mailto [Ghent University > Department of Solid State Sciences > Lumilab > >]
Pirard, Jean-Paul mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Heinrichs, Benoît mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces >]
2012
Chemical Engineering Journal
Elsevier Science
191
441-450
Yes (verified by ORBi)
International
1385-8947
Lausanne
Switzerland
[en] TiO2 xerogels ; p-Nitrophenol photodegradation ; Porphyrin sensitization ; Sol–gel process ; Kinetic
[en] TiO2 xerogels were sensitized in one step by the in situ introduction of nickel (II) tetra(4-carboxyphenyl)porphyrin (TCPPNi) into the TiO2 matrix during sol–gel synthesis. Crystalline photoactive phase TiO2-anatase was obtained without high thermal treatments and was determined by X-ray diffraction. The presence of TCPPNi in TiO2 xerogels was established by DR-UV/Vis and FT-IR spectroscopy. The introduction of porphyrin led to a diminution of the specific surface area of TiO2 xerogels, and this diminution was analyzed by nitrogen adsorption–desorption. The particle size was estimated by SEM. The xerogel surface charge state, which influences the interactions between pollutant and TiO2, was determined by measurement of the point of zero charge. The photoactivity of xerogels was evaluated for p-nitrophenol degradation in aqueous medium at 20 ◦C. Results showed that porphyrin doped TiO2 degraded more than 40% of the p-nitrophenol whereas non doped TiO2 xerogel degraded only 10% of the compound. Moreover, porphyrin was found to improve the photoactivity of TiO2 xerogels in a similar way to UV-A pretreatment. A kinetic study of p-nitrophenol degradation was then performed. Results showed that one type of active site corresponding to the hole of electron–hole pairs was created at the TiO2 surface by light and that the rate determining step was the reaction between the adsorbed
p-nitrophenol molecule and the adsorbed OH• radical. The apparent activation energy was found to be equal to 12 kJ mol−1.
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Fonds de la Recherche Fondamentale Collective - FRFC ; Région Wallonne – Direction Générale des Technologies, de la Recherche et de l’Énergie ; Ministère de la Communauté Francaise – Direction de la Recherche Scientifique ; Fonds de Bay ; Fonds Wetenschappelijk Onderzoek - FWO ; Interuniversity Attraction Poles Program–Belgian State–Belgian Science Policy- P6/17
http://hdl.handle.net/2268/118832
10.1016/j.cej.2012.02.050

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