Photocatalytic degradation intrinsic kinetics of gaseous cyclohexane in a fluidized bed photocatalytic reactor

A photocatalytic reactor has been designed to study the kinetics of photocatalytic degradation of phenol and methylene blue dye present in water stream on immobilized Ti02 catalyst. The principal part of the reactor consisted of a cylindrical pyrex glass tube whose outer surface was coated with the synthetic Ti02 film catalyst prepared from sol-gel technique. An ultraviolet light lamp of 365 nm wavelength was set longitudinally in the center of the tube. The synthetic Ti02 film formulation with the molar ratio of 1 titanium isopropoxide : 8 isopropanol: 1.1 H20: 3 acetyl acetone: 0.05 acetic acid was used to develop the immobilized Ti02 film catalyst deposited over the glass support. The performance of the immobilized photocatalytic reactor was evaluated by studying the decomposition kinetics of phenol and methylene blue dye present in the aqueous stream. The kinetics of photocatalytic degradation of phenol and methylene blue obeyed first order heterogeneous equation. The kinetic parameters were evaluated from the kinetic data using the Langmuir"Hinshelwood-Hougen-Watson (LHHW) model. Keywords: Kinetics, methylene blue, phenol, photocatalytic reactor, and Ti02 film catalyst.

Download Full-text

Photocatalytic Degradation of Toluene in Air Using a Fluidized Bed Photoreactor

International Journal of Photoenergy ◽

10.1155/2007/32859 ◽

2007 ◽

Vol 2007 ◽

pp. 1-8 ◽

Cited By ~ 16

Author(s):

O. Prieto ◽

J. Fermoso ◽

R. Irusta

Keyword(s):

Mass Transfer ◽

Photocatalytic Degradation ◽

Fluidized Bed ◽

Particle Surface ◽

Methanol Solution ◽

Transfer Coefficients ◽

Photocatalytic Reactor ◽

Degussa P25 ◽

Ft Ir ◽

Regeneration Processes

The photocatalytic degradation of toluene in air was carried out on particles ofTiO2in a photocatalytic reactor that had been developed to study the treatment of organic pollutants in a gaseous phase. Hypothetically, the fluidized bed technology of this reactor could make it possible to increase the mass transfer coefficients in comparison with those of conventional photoreactors. The photocatalytic particles used were prepared by mixingTiO2(Degussa P25) and starch in a methanol solution. The XRD and SEM results of these aggregates confirm the titanium dioxide (Degussa P25) characteristics, such as the presence of anatase on the particle surface and spongy and wrinkled morphology. Toluene concentrations varied from 0.9 to 199ppmv, and all the experiments were carried out with a flow rate of 300 NL/h. Toluene conversions from 77%to 100%were obtained in the range studied. In this work, the regeneration processes of deactivatedTiO2photocatalysts have been investigated using FT-IR and GC/MS techniques. Benzoic acid, benzaldehyde, and benzyl alcohol were the three major intermediate products identified.

Download Full-text

Intrinsic kinetics of clofibric acid photocatalytic degradation in a fixed-film reactor

Chemical Engineering Journal ◽

10.1016/j.cej.2015.08.060 ◽

2016 ◽

Vol 283 ◽

pp. 1384-1391 ◽

Cited By ~ 9

Author(s):

Agustina Manassero ◽

Silvia Mercedes Zacarías ◽

María Lucila Satuf ◽

Orlando Mario Alfano

Keyword(s):

Photocatalytic Degradation ◽

Clofibric Acid ◽

Intrinsic Kinetics ◽

Fixed Film ◽

Film Reactor ◽

Kinetics Of

Download Full-text

Adsorption and Photocatalytic Degradation of Reactive Brilliant Red K-2BP by TiO2/AC in Bubbling Fluidized Bed Photocatalytic Reactor

Industrial & Engineering Chemistry Research ◽

10.1021/ie101533x ◽

2010 ◽

Vol 49 (22) ◽

pp. 11321-11330 ◽

Cited By ~ 17

Author(s):

Qijin Geng ◽

Wenwen Cui

Keyword(s):

Photocatalytic Degradation ◽

Fluidized Bed ◽

Photocatalytic Reactor ◽

Bubbling Fluidized Bed

Download Full-text

Photocatalytic Degradation of Phenol Using a Nanocatalyst: The Mechanism and Kinetics

Journal of Catalysts ◽

10.1155/2013/364275 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6 ◽

Cited By ~ 8

Author(s):

Y. Tao ◽

Z. L. Cheng ◽

K. E. Ting ◽

X. J. Yin

Keyword(s):

Photocatalytic Degradation ◽

Solid Phase ◽

Degradation Mechanism ◽

Aqueous System ◽

Nano Zno ◽

Photocatalytic Reactor ◽

Headspace Spme ◽

Mechanism And Kinetics ◽

Photocatalytic Degradation Mechanism ◽

Kinetics Of

The study of photocatalytic degradation of phenol was exploited with nano-ZnO as immobilized photocatalysts in a laboratory scale photocatalytic reactor. The photocatalytic degradation mechanism and kinetics of phenol in water were studied using the solid-phase microextraction (SPME) technique. Based on optimized headspace SPME conditions, phenol in water was first extracted by the fibre, which was subsequently inserted into an aqueous system with immobilized photocatalysts (nano-ZnO) exposed to an irradiation source (i.e., ultraviolet A (UVA) lamps). After different irradiation times (5–80 min), four main intermediates of photocatalytic degradation generated on the fibre were determined by GC-MS.

Download Full-text