ORBi: Páez Martínez Carlos - Improvement in the methylene blue adsorption capacity and photocatalytic activity of H2-reduced rutile-TiO2 caused by Ni(II)porphyrin preadsorption

Reference : Improvement in the methylene blue adsorption capacity and photocatalytic activity of H2-...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Chemistry Engineering, computing & technology : Chemical engineering Engineering, computing & technology : Materials science & engineering
	To cite this reference:	http://hdl.handle.net/2268/112092

Title :	Improvement in the methylene blue adsorption capacity and photocatalytic activity of H2-reduced rutile-TiO2 caused by Ni(II)porphyrin preadsorption
Language :	English
Author, co-author :	Páez Martínez, Carlos [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Lambert, Stéphanie [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 [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Heinrichs, Benoît [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces >]
Publication date :	2011
Journal title :	Applied Catalysis B : Environmental
Publisher :	Elsevier Science
Volume :	106
Pages :	220-227
Audience :	International
ISSN :	0926-3373
City :	Amsterdam
Country :	The Netherlands
Keywords :	[en] Reduced TiO2 ; Rutile ; Ni(II)-porphyrin ; Methylene blue photodegradation ; Visible irradiation ; Sol–gel process
Abstract :	[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.
Funders :	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)
Permalink :	http://hdl.handle.net/2268/112092
DOI :	10.1016/j.apcatb.2011.05.029

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