Recrystallization and coalescence kinetics of TiO2 and ZnO nano-catalysts towards enhanced photocatalytic activity and colloidal stability within slurry reactors

2020 ◽  
Vol 252 ◽  
pp. 123235 ◽  
Author(s):  
Mouna Messaoud ◽  
Fatma Trabelsi ◽  
Priyanka Kumari ◽  
Andrea Merenda ◽  
Ludovic F. Dumée
Keyword(s):  
Photocatalytic Activity ◽  
Colloidal Stability ◽  
Slurry Reactors ◽  
Nano Catalysts ◽  
Kinetics Of

Effect of Rb+ -Doping on the Crystallization, Phase Transition and Photocatalytic Activity of Nanosized TiO2 Catalyst

2012 ◽  
Vol 476-478 ◽  
pp. 954-957 ◽  
Author(s):  
Zhao Hui Ni ◽  
Xiao Li Kou ◽  
Xin Yu Ding ◽  
Cun Wang Ge ◽  
Xiao Hui Jing
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Surface Area ◽  
Sol Gel ◽  
Rutile Phase ◽  
Bet Surface Area ◽  
X Rays ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Kinetics Of

In order to study the ion effect on titania phase structure, crystallite size, and photocatalytic activity, Rb+-doped TiO2 nanoparticles were prepared via a modified sol-gel method and characterized by means of X-ray diffraction, Energy Dispersive X-rays spectroscopy and transmission electron microscopy. The photocatalytic activity of the elaborated powders was studied following the degradation of methyl orange. The results indicate that doping Rb+ increases the BET surface area of TiO2 crystals, decreases the crystal size, reduces the diminishing rates of surface area with increasing calcinations temperature, raises the temperature at which anatase changes into rutile phase, and so significantly increases the photocatalytic activity of TiO2. The kinetics of the methyl orange degradation fits Langmuir-Hinshelwood kinetics model well.

scholarly journals Photocatalytic BiFeO3Nanofibrous Mats for Effective Water Treatment

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Parmiss Mojir Shaibani ◽  
K. Prashanthi ◽  
Amirreza Sohrabi ◽  
Thomas Thundat
Keyword(s):  
Photocatalytic Activity ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Sem Images ◽  
One Dimensional ◽  
First Order Kinetics ◽  
Vis Spectroscopy ◽  
Kinetics Of ◽  
Effective Water ◽  
Successful Production

One-dimensional BiFeO3(BFO) nanofibers fabricated by electrospinning of a solution of Nylon6/BFO followed by calcination were used for photocatalytic degradation of contaminants in water. The BFO fibers were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-Vis spectroscopy. The SEM images of the as-spun samples demonstrated the successful production of nanofibers and the SEM images of the samples after calcination confirmed the integrity of the continuous BFO nanofibers. XRD analysis indicated the dominant presence of BFO phase throughout the calcinated nanofibers. Photocatalytic activity of the nanofibers and their application in water purification were investigated against 4-chlorophenol (4CP) as a model water contaminant. The results of the UV-Vis spectroscopy show the degradation of the 4CP by means of the photocatalytic activity of the BFO nanofibers. The kinetics of the photodegradation of 4CP is believed to be governed by a pseudo-first-order kinetics model.

scholarly journals Kinetics of reduction of a resazurin-based photocatalytic activity ink

2017 ◽  
Vol 281 ◽  
pp. 14-20 ◽  
Author(s):  
Andrew Mills ◽  
Nathan Wells ◽  
John MacKenzie ◽  
Grant MacDonald
Keyword(s):  
Photocatalytic Activity ◽  
Kinetics Of ◽  
Kinetics Of Reduction

Electrokinetic properties, colloidal stability and aggregation kinetics of polymer colloids

1996 ◽  
Vol 67 ◽  
pp. 1-118 ◽  
Author(s):  
R. Hidalgo-Álvarez ◽  
A. Martín ◽  
A. Fernández ◽  
D. Bastos ◽  
F. Martínez ◽  
...  
Keyword(s):  
Colloidal Stability ◽  
Aggregation Kinetics ◽  
Electrokinetic Properties ◽  
Polymer Colloids ◽  
Kinetics Of

Influence of Electrolytes and Humic Acid on Aggregation Behavior of C60 Nanoparticles in Aquatic System

2013 ◽  
Vol 448-453 ◽  
pp. 48-51
Author(s):  
Hua Fang ◽  
Bing Bing Shen ◽  
Yu Xin Sun ◽  
Yuan Wang ◽  
Ji Lai Lu
Keyword(s):  
Humic Acid ◽  
Colloidal Stability ◽  
Dlvo Theory ◽  
Aquatic Environments ◽  
Aggregation Kinetics ◽  
Time Resolved ◽  
Diffusion Limited ◽  
Wide Range ◽  
Kinetics Of ◽  
And Diffusion

The aggregation kinetics of C60 nanoparticles have been investigated over a wide range of monovalent and divalent electrolyte concentrations by employing time-resolved dynamic light scattering (DLS). The results showed that the presence of electrolyte made a dramatic decrease in the surface zeta potential and increase in the particle size. The aggregation kinetics of C60 nanoparticles exhibited reaction-limited and diffusion-limited regimes, which was found to be consistent with the classic Derjaguin-Landau-Verwey-Overbeek (DLVO) theory of colloidal stability. The critical coagulation concentration (CCC) values of C60 nanoparticles were estimated as 321mM Na+, 295mM K+, 9.6mM Ca2+and 6.7mM Mg2+, which were far higher than the electrolyte concentrations in natural water. The enhanced C60 stability in the presence of humic acid was attributable to steric repulsion. Therefore C60 nanoparticles can be relatively stable in typical aquatic environments.

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