Comparison of the efficiency of immobilized and suspended systems in photocatalytic degradation

Dijkstra, Marcel; Michorius, A.; Buwalda, H.; Panneman, H.J.; Winkelman, Jozef G. M.; Beenackers, A.A.C.M.

doi:10.1016/s0920-5861(01)00257-7

Cited by 131 publications

(81 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Even if coagulation, flocculation or centrifugation is used, the supernatant may not be clear. In the past decade, much effort was devoted to photocatalyst immobilization on Raschig rings, glass tubes, glass beads, glass fiber, zeolites and activated carbon [8][9][10]. However, immobilized TiO 2 was less active due to lower specific surface area in such systems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and Application of Magnetic Photocatalysts for Water Treatment. The Effect of Particle Charge on Surface Functionality

et al. 2017

View full text Add to dashboard Cite

Core-interlayer-shell Fe 3 O 4 /SiO 2 /TiO 2 , CoFe 2 O 4 /SiO 2 /TiO 2 and BaFe 12 O 19 /SiO 2 /TiO 2 magnetic photocatalysts were obtained. A water-in-oil microemulsion system with suitable surfactants was used for functionalization of the magnetic core with silica interlayer and TiO 2 -based photocatalyst. Uncoated and coated particles were characterized by electrophoretic measurements, X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area (BET) measurements, diffuse reflectance spectroscopy (DRS) and vibrating sample magnetometer (VSM) analysis. The pH of the solution and corresponding zeta potential was found to be essential for appropriate formation of ferrite core/silica interlayer/TiO 2 shell nanocomposite, since the electrical charge controls interactions during functionalization of the magnetic core particles. Thus, the development of multilayer structure in the isoelectric point (IEP) region enhanced adhesion of ferrite, silica and titania particles. The obtained Fe 3 O 4 /SiO 2 /TiO 2 , CoFe 2 O 4 /SiO 2 /TiO 2 and BaFe 12 O 19 /SiO 2 /TiO 2 nanocomposites revealed superparamagnetic behavior. The decomposition rate of phenol and carbamazepine allowed to estimate their photocatalytic activity. Progress of photocatalytic mineralization of organic compounds was evaluated by total organic carbon (TOC) measurements. Photocatalytic activity measured in four subsequent cycles showed good reusability as no loss of efficiency of phenol degradation was observed.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Catalysts 2017, 7, 360 2 of 18 glass beads, glass fiber, zeolites and activated carbon [8][9][10]. However, immobilized TiO2 was less active due to lower specific surface area in such systems.…”

Section: Introductionmentioning

confidence: 99%

Design and Application of Magnetic Photocatalysts for Water Treatment. The Effect of Particle Charge on Surface Functionality

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In fact, the radical species are able to decompose virtually all organic materials such as pollutants or other reactants finally to CO 2 and H 2 O. To achieve a high turnover rate, a high specific surface area of the TiO 2 material is desired and thus, for most conventional applications, TiO 2 nanoparticles are used either suspended in the solution or as immobilized compacted powder layers in various types of reactors [7,8]. Nanoparticle layers that are coated on a conductive substrate can also be used as electrodes for photoelectrochemical applications, i.e., the photocatalytic activity can additionally be influenced with an applied electrochemical potential [1,9,10].…”

Section: Introductionmentioning

confidence: 99%

Some critical factors for photocatalysis on self-organized TiO2 nanotubes

Liu

Paramasivam

Yang

et al. 2012

J Solid State Electrochem

View full text Add to dashboard Cite

In the present work, different intrinsic and extrinsic parameters are investigated that affect the photocatalytic activity of self-organized TiO 2 nanotube layers. Particularly, the influence of annealing temperature and annealing atmosphere, the influence of different gas purging in the electrolyte, and the effect of applied voltage on the photocatalytic degradation rates of acid orange (AO7) are discussed. We find that the effect of the reducing gas atmosphere dominates over the anatase/rutile ratio in activating the nanotube layers. Moreover, we show that the effect of different gas purging (Ar and O 2 ) of the electrolyte affects the reaction rate twofold: (1) by providing electron acceptor states and also by (2) a different change in the red-ox potential, i.e., the band bending in TiO 2 . By an external anodic voltage, the reaction rates can be increased drastically due to increased band bending. Nevertheless, the magnitude of the effect is also affected by the presence or absence of O 2 in the electrolyte.

show abstract

“…Put simply, observation has shown that the apparent first-order rate equation can describe successfully the photodegradation of numerous organic compounds (De Heredia et al 2001;Lachheb et al 2002;Guettaï and Amar 2005;Chen et al 2007;Caliman et al 2007) even if it could not directly give adequate fitting (Demeestere et al 2004). It is possible nonetheless, especially at saturation coverage to come across consistence with pseudo-zeroeth order kinetics (Dijkstra et al 2001).…”

Section: Photocatalytic-controlled Processmentioning

confidence: 99%

Mechanistic Principles of Photocatalytic Reaction

Gaya¹

2013

Heterogeneous Photocatalysis Using Inorganic Semiconductor Solids

View full text Add to dashboard Cite

As developments in semiconductor photocatalysis flourish, profound success is being recorded in the elucidation of reactivity vis-à-vis mechanism. The mechanism of photocatalytic reactions lies between two limits. From viewpoint of photochemical kinetics, the reaction mechanism will be controlled by the properties of light and consequences of light absorption. However as mass transfer dominates, the process will be controlled by the non-catalytic diffusion mechanism. This chapter highlights both diffusion and photocatalytically controlled kinetics in semiconductor-based heterogeneous regimes. In the final place, some conventional analytical methods for validation of photocatalytic reaction mechanism are discussed.

show abstract

Comparison of the efficiency of immobilized and suspended systems in photocatalytic degradation

Cited by 131 publications

References 12 publications

Design and Application of Magnetic Photocatalysts for Water Treatment. The Effect of Particle Charge on Surface Functionality

Design and Application of Magnetic Photocatalysts for Water Treatment. The Effect of Particle Charge on Surface Functionality

Some critical factors for photocatalysis on self-organized TiO2 nanotubes

Mechanistic Principles of Photocatalytic Reaction

Contact Info

Product

Resources

About