Photocatalytic decolorization kinetics of diazo dye Congo Red aqueous solution by UV/TiO2 nanoparticles

Ćurković, Lidija; Ljubas, Davor; Juretić, Hrvoje

doi:10.1007/s11144-009-0098-x

Cited by 15 publications

(14 citation statements)

References 26 publications

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“…Commercially available titania nanoparticles catalyst from P25-Degussa, with purity 99.9%, was used as received for the comparison of photocatalytic activity of prepared TiO 2 film on Al 2 O 3 foam substrate. The P25-Degussa was used without further modification, i.e., it is mostly in the anatase form (75-80% anatase and 20-25% rutile), nonporous, with a reactive surface (BET) area of 50 to 54 m 2 g −1 , corresponding to a mean particle size of around 30 nm [32].…”

Section: Chemicals and Reagentsmentioning

confidence: 99%

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

et al. 2020

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In the present work, alumina (Al2O3) foam was prepared by the replica method where a polyurethane (PU) foam (30 pores per inch (ppi)) template was impregnated with a 60 wt.% Al2O3 suspension. Sintered Al2O3 foam was used as substrate for the deposition of sol-gel derived titania (TiO2) film using dip coating. For the preparation of TiO2 sol, titanium(IV) isopropoxide (Ti-iPrOH) was used as the precursor. The common problem of qualification and quantification of a crystalline coating on a highly porous 3D substrate with an uneven surface was addressed using a combination of different structural characterization methods. Using Powder X-ray Diffraction (PXRD) and synchrotron Grazing Incidence X-ray Diffraction (GIXRD) on bulk and powdered Al2O3 foam and TiO2-coated Al2O3 foam samples, it was determined Al2O3 foam crystallizes to corundum and coating to anatase, which was also confirmed by Fourier Transformed Infrared Spectroscopy (FTIR). Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM/EDS) revealed the structural and microstructural properties of the substrate and coating. Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) were used to clarify the evolution of the porous microstructure. The Al2O3-TiO2 composite was evaluated as a photocatalyst candidate for the degradation of the micropollutant medication memantine. The degradation rate was monitored using a light-emitting diode (LED) lamp operating at electromagnetic (EM) wavelength of 365 nm. The photocatalytic activity of sol-gel-derived TiO2 film immobilized on the Al2O3 foam was compared with commercially available TiO2 nanoparticles, P25-Degussa, in the form of a suspension. The levels of memantine were monitored by High-Performance Liquid Chromatography–Tandem Mass Spectrometry (HPLC–MS/MS). The efficiency and rate of the memantine photodegradation by suspended TiO2 nanoparticles is higher than the TiO2-coated Al2O3 foam. But, from the practical point of view, TiO2-coated Al2O3 foam is more appropriate as a valuable photocatalytic composite material.

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Section: Chemicals and Reagentsmentioning

confidence: 99%

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

et al. 2020

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“…The comparison of this study and the results from literature survey was illustrated in Table 4. As can be seen from figure, the reported studies have been carried out for photocatalytic degradation of CR dye by using different photocatalysts such as, WO 3 -TiO 2 / AC, CuO, ZnO-CdS, Zn 1ÀX Cu X S, Zn 1ÀX Ni X S, Ag/TiO 2 and TiO 2 -Degussa P-25 [59][60][61][62][63][64]. Compared with all of photocatalysts used, Pd/ZnO photocatalyst has the highest photocatalytic activity.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Comparison of palladium/zinc oxide photocatalysts prepared by different palladium doping methods for congo red degradation

Güy

Çakar

Özacar

2016

Journal of Colloid and Interface Science

132

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“…In the case of dyes, there may be some problems to distinguish the adsorption of dyes on the photocatalyst surface from the photocatalytic decomposition of the dyes. There is no problems if the adsorption of the dye on the surface of TiO 2 is negligible [9,10]. For example, Zhu et al [10] remarked that the high adsorption capacity of photocatalyst PT/TiO 2 (a composite prepared by the in situ chemical oxidative polymerization of thiophene) could possibly increase the photocatalytic degradation rate of methyl orange.…”

Section: Introductionmentioning

confidence: 99%

Determination of the photocatalytic activity of TiO2 with high adsorption capacity

Janus

Kusiak-Nejman

Morawski

2011

Reac Kinet Mech Cat

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Photocatalysis is often used for the decomposition of organic compounds in water, e.g., for dye decomposition. There are many problems with calculating the photocatalytic activity of photocatalysts during dye decomposition, especially in the case of photocatalysts with a high adsorption capacity because it is difficult to say whether a dye is photocatalytically decomposed or whether it is only adsorbed on photocatalyst surface. In both cases, the dye disappears from the water, but the optimal situation is when the dye is both adsorbed and decomposed on photocatalyst surface. Moreover, it is problematic to compare the photocatalytic activity of different photocatalysts when they have strong adsorption capacity. In this study a new method of measuring photocatalytic activity of photocatalysts with high adsorption capacity is presented. Reactive Red (monoazo) and Direct Green (poliazo) dyes were used to determine adsorption capacity and photocatalytic activity of commercial TiO 2 Degussa P25, anatase TiO 2 and carbon modified anatase TiO 2 .

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Photocatalytic decolorization kinetics of diazo dye Congo Red aqueous solution by UV/TiO2 nanoparticles

Cited by 15 publications

References 26 publications

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

Comparison of palladium/zinc oxide photocatalysts prepared by different palladium doping methods for congo red degradation

Determination of the photocatalytic activity of TiO2 with high adsorption capacity

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