scholarly journals Photocatalytic degradations of JWS-type kinetics

2021 ◽  
Author(s):  
C. L. Wang
Keyword(s):  
Experimental Data ◽  
Fractional Calculus ◽  
Photocatalytic Degradation ◽  
Chemical Kinetics ◽  
Relaxation Function ◽  
Degradation Kinetics ◽  
Material Parameters ◽  
Kinetics Of ◽  
Fitting Parameters

Photocatalytic degradation kinetics of Jurlewicz–Weron–Stanislavsky (JWS) type has been identified. Experimental data are taken from previous published works, and fitted with the JWS relaxation function as well as that of the Havriliak–Negami (HN) model. All experimental data can fit with either model fairly good. From the fitting parameters, the Jonscher indices are calculated and Jonscher diagram is plotted for the chemical kinetics of photocatalytic degradations. This work suggests that material parameters of photocatalysts can be well defined in the sense of fractional calculus.

scholarly journals Photocatalytic degradation as Davidson–Cole relaxation in time domain

2019 ◽  
Vol 09 (01) ◽  
pp. 1950006 ◽  
Author(s):  
C. L. WANG
Keyword(s):  
Experimental Data ◽  
Differential Equations ◽  
Photocatalytic Degradation ◽  
Gamma Function ◽  
Time Domain ◽  
Degradation Kinetics ◽  
Incomplete Gamma Function ◽  
Response Functions ◽  
Degradation Processes

Photocatalytic degradation processes of different materials are fitted with Mittag-Leffler function and incomplete gamma function, which are response functions for Cole–Cole relaxation and Davidson–Cole relaxation. The fitting results show that both functions can fit experimental data fairly well. The order of derivative in the kinetic differential equations can be either less, or greater than one. In the case of the order of derivative is greater than one, only incomplete gamma function is reasonable for describing the photocatalytic degradation. This work further confirms the existence of the universality in photocatalytic degradation kinetics.

scholarly journals Synthesis and degradation kinetics of TiO2/GO composites with highly efficient activity for adsorption and photocatalytic degradation of MB

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ruifen Wang ◽  
Kaixuan Shi ◽  
Dong Huang ◽  
Jing Zhang ◽  
Shengli An
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Adsorption Capacity ◽  
Degradation Kinetics ◽  
Removal Rate ◽  
Strong Adsorption ◽  
Degradation Activity ◽  
Kinetics Of ◽  
Stacking Structure ◽  
Synthesis And Degradation

AbstractPoriferous TiO2/GO (denoted as TGO-x%) photocatalysts with ultrathin grapheme oxide (GO) layer were prepared by a hydrothermal method, the adsorption and photocatalytic degradation and its kinetics about Methylene blue(MB) were studied systematically. All the TGO-x% showed improved adsorption and photodegradation performance. TGO-25% had excellent adsorptivity while TGO-20% exhibit the highest visible light photocatalytic degradation activity. The adsorption capacity for TGO-25% was 20.25 mg/gcatalyst along with the k1 was about 0.03393 min·gcatalyst/mg, this enhancement was mainly owing to the strong adsorption capacity of GO and the stacking structure of sheets and nanoparticles. GO sheets prevented the agglomeration of TiO2 particles and TiO2 nanoparticles also prevented the agglomeration of GO sheets, which could provides greater surface area. Besides, the remarkably superior photodegradation activity of TiO2/GO composites is mainly attribute to the strong absorption of visible light and the effective charge separation revealed by the photoluminescence, the total removal rate of MB is 97.5% after 35 min adsorption and 140 min degradation, which is 3.5 times higher than that of TiO2.

Impact of the kind of ultraviolet light on the photocatalytic degradation kinetics of the TiO2/UV process

2011 ◽  
Vol 30 (3) ◽  
pp. 318-325 ◽  
Author(s):  
J.A. Cortés ◽  
M.T. Alarcón-Herrera ◽  
M. Villicaña-Méndez ◽  
J. González-Hernández ◽  
J.F. Pérez-Robles
Keyword(s):  
Photocatalytic Degradation ◽  
Ultraviolet Light ◽  
Degradation Kinetics ◽  
Kinetics Of

Photocatalytic Degradation of Bisphenol AF in TiO2 Suspension

2014 ◽  
Vol 955-959 ◽  
pp. 2334-2339
Author(s):  
Pin Wen Wang
Keyword(s):  
Photocatalytic Degradation ◽  
Reaction Rate ◽  
Degradation Kinetics ◽  
Fluoride Concentration ◽  
Reaction Rate Constant ◽  
Rate Model ◽  
Initial Concentration ◽  
Fluoride Pollution ◽  
Kinetics Of ◽  
Bisphenol Af

The photodegradation behavior of bisphenol AF (BPAF) in TiO2 suspension was investigated. The influence of dissolved oxygen, TiO2 dosage, fluoride, and initial BPAF concentration on the degradation of BPAF was studied and described in details. The main purposes were to clarify the degradation kinetics of BPAF and quantify the fluoride concentration during the degradation. At an initial concentration of 40 mol/L, more than 97% of TOC was removed efficiency was achieved within 540 min irradiation, and the concentration of fluoride was 0.98 mg/L. Degradation of BPAF followed the Langmuir–Hinshelwood kinetics rate model and the reaction rate constant kre was 1.21 μM/min. The results obtained indicated that TiO2 photocatalytic degradation is a highly effective way to remove BPAF without any generation of more toxic products or fluoride pollution.

Adsorption and Photocatalytic Degradation Kinetics of Pharmaceuticals by TiO2 Nanowires During Water Treatment

2012 ◽  
Vol 3 (4) ◽  
pp. 443-449 ◽  
Author(s):  
A. Hu ◽  
X. Zhang ◽  
D. Luong ◽  
K. D. Oakes ◽  
M. R. Servos ◽  
...  
Keyword(s):  
Water Treatment ◽  
Photocatalytic Degradation ◽  
Degradation Kinetics ◽  
Tio2 Nanowires ◽  
Kinetics Of
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