Reference : Improvement in the methylene blue adsorption capacity and photocatalytic activity of H2-...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Chemical engineering
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/112092
Improvement in the methylene blue adsorption capacity and photocatalytic activity of H2-reduced rutile-TiO2 caused by Ni(II)porphyrin preadsorption
English
Páez Martínez, Carlos 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 >]
Poelman, Dirk [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 >]
2011
Applied Catalysis B : Environmental
Elsevier Science
106
220-227
Yes (verified by ORBi)
International
0926-3373
Amsterdam
The Netherlands
[en] Reduced TiO2 ; Rutile ; Ni(II)-porphyrin ; Methylene blue photodegradation ; Visible irradiation ; Sol–gel process
[en] H2-reduced rutile-TiO2 xerogel (Ti-700), obtained via the sol–gel process, was found to strongly adsorb the Ni(II)-5,10,15,20-tetrakis(4-carboxyphenyl)-porphyrin (NiTCPP) from a methanolic solution, despite its
very low specific surface area (SBET ≈ 2 m2 g−1). UV/vis spectroscopy analysis showed that after calcination
at 700 ◦C and reduction under H2 flow at 400 ◦C, the TiO2-xerogel increased its NiTCPP-adsorption capacity
by surface area unit by up to 120 times. The effect of the porphyrin presence in the catalytic performances
of TiO2-xerogels was studied through three kinetics models: (i) the pseudo-first-order kinetic model;
(ii) the pseudo-second-order kinetic model, which are used to describe the adsorption rate based on
the adsorption capacity of the catalysts; and (iii) the Langmuir–Hinshelwood kinetic model which is
used to describe the photocatalytic degradation rate of methylene blue (MB). A significant improvement
in the efficiency of Ti-700 was observed after the porphyrin-adsorption process (NiTCPP/Ti-700): MB-adsorption
capacity at equilibrium and the apparent MB-photoconversion constant, kapp, of NiTCPP/Ti-700 were both up to 2 times higher than those observed for the Ti-700.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Fonds de la Recherche Fondamentale Collective - FRFC ; Ministère de la Région Wallonne ; Fonds Wetenschappelijk Onderzoek - FWO ; Belgian Interuniversity Attraction Pole INANOMAT (IAP-P6/17)
http://hdl.handle.net/2268/112092
10.1016/j.apcatb.2011.05.029

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