Photocatalytic degradation of chlorophenols in soil washing wastes containing Brij 35. Correlation between the degradation kinetics and the pollutants–micelle binding

Aims: The aim of this research work is to synthesise, study and analyse photocatalytic degradation, kinetics and microbial activity of new surfactant Copper (II) soya urea complex(CSU). Background: Photocatalytic degradation has attracted the attention of scientific community throughout the world due to its multiple applications in environment, energy, waste water treatment, pollution control, green chemistry, etc. Copper (II) soya urea complex has been synthesized and characterized through FT-IR, NMR, ESR studies. Objective: Present work deals with the study of photocatalytic degradation of Copper (II) soya urea complex by using ZnO as semiconductor. This study employs a semiconductor catalyst using non polar and non aqueous solvent in photocatalytic degradation. Reaction rate is chosen as the photocatalytic activity, which has been governed by several factors. Antibacterial activities of Copper (II) complex have also been studied against Staphylococcus aureus. Method: Optical density (O.D.) was measured after different time intervals spectrophotometrically to measure the degradation of complex. Mueller-Hinton agar medium was used for antimicrobial activity of synthesized compound at different concentrations by disk/ well diffusion susceptibility testing. Result: Plot of 2+log O.D. (absorbance) versus time was plotted and found linear. The heterogeneous photocatalysis followed pseudo-first-order reaction kinetics.The present study suggests that Copper (II) soya urea (CSU) complex shows antibacterial activity against Staphylococcus aureus at different concentrations. Conclusion: The results were used to determine the rate of photocatalytic degradation of CSU complex .It has been found that rate of degradation varies with different parameters like concentration of complex, amount of catalyst, light intensity, solvent polarity etc. CSU complex derived from soyabean oil has been shown an inhibitory effect on the growth of S. aureus which may causes skin disease.

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Photocatalytic Degradation and Antibacterial Study of Copper(II) Mustard Thiourea Complex

Current Physical Chemistry ◽

10.2174/1877946810666200221122053 ◽

2020 ◽

Vol 10 (3) ◽

pp. 229-242

Author(s):

Vandana Sukhadia ◽

Rashmi Sharma ◽

Asha Meena

Keyword(s):

Photocatalytic Degradation ◽

Skin Diseases ◽

Polar Solvent ◽

Degradation Kinetics ◽

Research Work ◽

Solvent Polarity ◽

Inhibitory Effect ◽

Mustard Oil ◽

Urea Complex ◽

Pseudo First Order Reaction

Aims: The aim of this research work is to synthesise, study and analyse photocatalytic degradation, kinetics. Background: Copper(II) mustard thio urea complex has been synthesized and characterized through FT-IR, NMR, ESR studies. Objective: Photocatalytic degradation of copper(II) mustard thio urea complex was studied in the presence of ZnO as a catalyst in the solution form, using a non polar solvent benzene and a polar solvent methanol with different compositions. Antibacterial activities of copper(II) complex have also been studied against Staphylococcus aureus. Method: O.D. was measured after different time intervals spectrophotometrically to measure the degradation of the complex. Result: Plot of 2+ log O.D. (absorbance) versus time was plotted and found to be linear. The heterogeneous photocatalysis followed pseudo-first-order reaction kinetics. The present study suggests that the CMT complex shows antibacterial activity at different concentrations. Conclusion: The rate of photocatalytic degradation of CMT complex was studied and analyzed. It has been found that the rate of degradation varies with different parameters like the concentration of complex, the amount of catalyst, light intensity, solvent polarity etc. The CMT complex derived from natural mustard oil has shown an inhibitory effect on the growth of S. aureus which may cause skin diseases.

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Immobilization of Nano-TiO2 on Expanded Perlite for Photocatalytic Degradation of Rhodamine B

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.110-116.3795 ◽

2011 ◽

Vol 110-116 ◽

pp. 3795-3800 ◽

Cited By ~ 1

Author(s):

Xiao Zhi Wang ◽

Wei Wei Yong ◽

Wei Qin Yin ◽

Ke Feng ◽

Rong Guo

Keyword(s):

Catalytic Activity ◽

Photocatalytic Degradation ◽

Rhodamine B ◽

Degradation Kinetics ◽

Irradiation Time ◽

Sol Gel ◽

Polluted Water ◽

Order Kinetic ◽

Expanded Perlite ◽

Initial Concentration

Expanded perlite (EP) modified titanium dioxide (TiO2) with different loading times were prepared by Sol-Gel method. Photocatalytic degradation kinetics of Rhodamine B (RhB) in polluted water by the materials (EP-nanoTiO2), as well as the effects of different loading times and the initial concentration of RhB on photocatalysis rate were examined. The catalytic activity of the regenerated photocatalyst was also tested. The results showed that photocatalyst modified three times with TiO2had the highest catalytic activity. Degradation ratio of RhB by EP-nanoTiO2(modified three times) under irradiation for 6 h were 98.0%, 75.6% and 63.2% for 10 mg/L, 20 mg/L and 30 mg/L, respectively.The photocatalyst activity has little change after the five times recycling, and the degradation rate of RhB decreased less than 8%. The reaction of photocatalysis for RhB with irradiation time can be expressed as first-order kinetic mode within the initial concentration range of RhB between 10mg/L and 30 mg/L. EP-nanoTiO2photocatalyst has a higher activity and stability to degrade RhB in aqueous solution.

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Photocatalytic degradation as Davidson–Cole relaxation in time domain

Journal of Advanced Dielectrics ◽

10.1142/s2010135x19500061 ◽

2019 ◽

Vol 09 (01) ◽

pp. 1950006 ◽

Cited By ~ 2

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.

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

Scientific Reports ◽

10.1038/s41598-019-54320-w ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 2

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.

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Photocatalytic degradation kinetics of Orange G dye over ZnO and Ag/ZnO thin film catalysts

Scientific Reports ◽

10.1038/s41598-019-54142-w ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 5

Author(s):

Derya Tekin ◽

Taner Tekin ◽

Hakan Kiziltas

Keyword(s):

Thin Film ◽

Kinetic Model ◽

Photocatalytic Degradation ◽

Degradation Kinetics ◽

Reaction Medium ◽

Rate Equations ◽

Zno Thin Film ◽

Model Studies ◽

Thin Film Catalysts ◽

Orange G

AbstractThe degradation of water pollutants with photocatalysts is one of the most studied subjects in the past 20 years. Although considerable studies have been completed in this field, kinetic model studies are still a major inadequacy. In this study, ZnO and Ag/ZnO thin film photocatalysts were synthesized and SEM-EDS, XRD and chronoamperometric measurements were used the characterization of photocatalysts. The network kinetic model was applied the photocatalytic degradation of Orange G using ZnO and Ag/ZnO thin film photocatalysts. The photocatalytic degradation of Orange G was investigated under the different reaction medium (initial dye concentrations, temperature, light intensity). It was found that the network kinetic model is the most appropriate model for the degradation of Orange G dye on the ZnO and Ag/ZnO thin film photocatalysts. The calculated adsorption equilibrium (KB) constant and activation energy of ZnO thin film photocatalyst are 0.0191 and 21.76 kj/mol, respectively. Additionally, the calculated values for Ag/ZnO thin film photocatalyst are 0.035 and 18.32 kj/mol. The general rate equations were determined for each photocatalysts.

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The study of the photocatalytic degradation kinetics for dichloroethylene in vapor phase

Chemosphere ◽

10.1016/s0045-6535(99)00038-7 ◽

1999 ◽

Vol 39 (9) ◽

pp. 1371-1384 ◽

Cited By ~ 15

Author(s):

Kuo-Hua Wang ◽

Yung-Hsu Hsieh ◽

Chung-Hsiang Lin ◽

Chen-Yu Chung

Keyword(s):

Photocatalytic Degradation ◽

Vapor Phase ◽

Degradation Kinetics

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Photocatalytic degradation of bentazone in soil washing wastes containing alkylpolyoxyethylene surfactants

Chemosphere ◽

10.1016/j.chemosphere.2011.09.011 ◽

2012 ◽

Vol 86 (4) ◽

pp. 335-340 ◽

Cited By ~ 22

Author(s):

M. Davezza ◽

D. Fabbri ◽

E. Pramauro ◽

A. Bianco Prevot

Keyword(s):

Photocatalytic Degradation ◽

Soil Washing

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Photocatalytic Degradation of Monolinuron and Linuron in an Aqueous Suspension of Titanium Dioxide Under Simulated Solar Irradiation

Revue des sciences de l eau ◽

10.7202/015810ar ◽

2007 ◽

Vol 20 (2) ◽

pp. 163-172 ◽

Cited By ~ 3

Author(s):

Razika Zouaghi ◽

Abdennour Zertal ◽

Bernard David ◽

Sylvie Guittonneau

Keyword(s):

Photocatalytic Degradation ◽

Degradation Rate ◽

Ph Value ◽

Degradation Kinetics ◽

Aqueous Suspension ◽

Operating Conditions ◽

Solar Irradiation ◽

Point Of Zero Charge ◽

Degradation Rates ◽

Simulated Solar Irradiation

Abstract The photocatalytic degradation of two phenylurea herbicides, monolinuron (MLN) and linuron (LN), was investigated in an aqueous suspension of TiO2 using simulated solar irradiation. The objective of the study was to compare their photocatalytic reactivity and to assess the influence of various parameters such as initial pesticide concentration, catalyst concentration and photonic flux on the photocatalytic degradation rate of MLN and LN. A comparative study of the photocatalytic degradation kinetics of both herbicides showed that these two compounds have a comparable reactivity with TiO2/simulated sun light. Under the operating conditions of this study, the photocatalytic degradation of MLN and LN followed pseudo first-order decay kinetics. The kobs values indicated an inverse dependence on the initial herbicide concentration and were fitted to the Langmuir-Hinshelwood equation. Photocatalytic degradation rates increased with TiO2 dosage, but overdoses did not necessarily increase the photocatalytic efficiency. The degradation rate of MLN increased with radiant flux until an optimum at 580 W m‑2 was reached and then decreased. Under these conditions, an electron-hole recombination was favored. Finally, the photocatalytic degradation rate depended on pH, where an optimum was found at a pH value close to the pH of the point of zero charge (pH = 6).

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PHOTOCATALYTIC DEGRADATION OF PYRENE IN POROUS Pt/TiO2–SiO2 PHOTOCATALYST SUSPENSION UNDER UV IRRADIATION

NANO ◽

10.1142/s1793292008001143 ◽

2008 ◽

Vol 03 (05) ◽

pp. 317-322 ◽

Cited By ~ 5

Author(s):

ZHAOHUI LUO ◽

KEIKO KATAYAMA-HIRAYAMA ◽

KIMIAKI HIRAYAMA ◽

TETSUYA AKITSU ◽

HIDEHIRO KANEKO

Keyword(s):

Molecular Weight ◽

Photocatalytic Degradation ◽

High Molecular Weight ◽

Uv Irradiation ◽

Degradation Kinetics ◽

Degradation Process ◽

Bet Surface Area ◽

Experimental Conditions ◽

Initial Concentration ◽

X Ray

Pyrene is a high molecular weight polycyclic aromatic hydrocarbon (PAH) that is found in water systems worldwide. It is harmful to living organisms, even when taken in very small amounts. The photocatalytic degradation of pyrene in porous Pt / TiO 2– SiO 2 photocatalyst (PPtPC) suspension under UV irradiation was investigated in this study. PPtPC was prepared by a simple heat treatment of the compacted powder mixtures of anatase TiO 2 and amorphous SiO 2 with camphor as a pore directing template, followed by coating platinum by the dip-coating method. X-ray diffraction (XRD), scanning electron microscopy (SEM) with an integrated energy-dispersive analysis of the X-ray (EDX) system, and Brunauer–Emmett–Teller (BET) were used to characterize PPtPC. The degradation kinetics of pyrene in different experimental conditions, such as initial concentration of pyrene, oxygen concentrations, pH, and temperature, were investigated. The durability of PPtPC was also tested. The results indicate that the structure of TiO 2 in PPtPC is anatase. The aggregated size of PPtPC is in the range of 10–100 μm, the mean pore diameter is 3 nm, and the BET surface area is 109 m2 g-1. The photocatalytic degradation process of pyrene follows pseudo-first-order kinetics. The rate constants increase as the initial concentration of pyrene and pH decrease. Higher temperature slightly enhances the rate constant. The dissolved oxygen in the photocatalytic degradation process is not as important as in the photolysis process. The recovered PPtPC still shows high photoactivity. This work suggests that PPtPC offers a promising method for high molecular weight PAH removal.

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