Photocatalytic degradation kinetics and mechanisms of antibacterial triclosan in aqueous TiO2suspensions under simulated solar irradiation

2014 ◽  
Vol 89 (8) ◽  
pp. 1145-1154 ◽  
Author(s):  
Nikolaos Stamatis ◽  
Maria Antonopoulou ◽  
Dimitra Hela ◽  
Ioannis Konstantinou
Keyword(s):  
Photocatalytic Degradation ◽  
Degradation Kinetics ◽  
Solar Irradiation ◽  
Simulated Solar Irradiation

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

2007 ◽  
Vol 20 (2) ◽  
pp. 163-172 ◽  
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).

scholarly journals Photocatalytic Degradation of Tobacco Tar Using CsPbBr3 Quantum Dots Modified Bi2WO6 Composite Photocatalyst

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2422
Author(s):  
Runda Huang ◽  
Menglong Zhang ◽  
Zhaoqiang Zheng ◽  
Kunqiang Wang ◽  
Xiao Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Degradation ◽  
Solar Irradiation ◽  
Composite Photocatalyst ◽  
Polycyclic Aromatic ◽  
Cigarette Paper ◽  
Novel Applications ◽  
Simulated Solar Irradiation ◽  
First Time ◽  
Cspbbr3 Quantum Dots

Polycyclic aromatic hydrocarbons (PAHs) in tobacco tar are regarded as a significant threat to human health. PAHs are formed due to the incomplete combustion of organics in tobacco and cigarette paper. Herein, for the first time, we extended the application of CsPbBr3 quantum dots (CsPbBr3) to the photocatalytic degradation of tobacco tar, which was collected from used cigarette filters. To optimize the photoactivity, CsPbBr3 was coupled with Bi2WO6 for the construction of a type-II photocatalyst. The photocatalytic performance of the CsPbBr3/Bi2WO6 composite was evaluated by the degradation rate of PAHs from tobacco tar under simulated solar irradiation. The results revealed that CsPbBr3/Bi2WO6 possesses a large specific surface area, outstanding absorption ability, good light absorption and rapid charge separation. As a result, in addition to good stability, the composite photocatalyst performed remarkably well in degrading PAHs (over 96% were removed in 50 mins of irradiation by AM 1.5 G). This study sheds light on promising novel applications of halide perovskite.

Photocatalytic Degradation of Acrylic Acid, Acrolein and Hydroquinone Using TiO2 under Simulated Solar Irradiation

2013 ◽  
Vol 781-784 ◽  
pp. 2129-2132 ◽  
Author(s):  
Yan Wen Gong ◽  
Xue Ni Cheng ◽  
Hong Xun Zhang
Keyword(s):  
Acrylic Acid ◽  
Photocatalytic Degradation ◽  
Nitrogen Doping ◽  
Solar Irradiation ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order ◽  
Simulated Solar Irradiation

Nitrogen doping TiO2was prepared and used to degrade acrolein wastewater under simulated solar irradiation acrylic acid. The results showed that the removal of acrolein, hydroquinone and acrylic acid were 0.73, 0.64, 0.26 after 4 hour degradation by TiO2/UV system. The degradation of acrolein, hydroquinone and acrylic acid using TiO2/UV system followed pseudo first-order kinetics. It results indicated that this proposed method can be useful for the pretreatment acrolein wastewater.

scholarly journals Photodegradation of selected pesticides: Photocatalytic activity of bare and PANI-modified TiO2 under simulated solar irradiation

2019 ◽  
Vol 84 (12) ◽  
pp. 1455-1468
Author(s):  
Marina Lazarevic ◽  
Vesna Despotovic ◽  
Daniela Sojic-Merkulov ◽  
Nemanja Banic ◽  
Nina Fincur ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Electron Acceptors ◽  
Solar Irradiation ◽  
Distilled Water ◽  
Intermediate Species ◽  
Environmental Waters ◽  
Starting Compound ◽  
River Danube ◽  
Simulated Solar Irradiation

In this paper the efficiency of photocatalytic degradation of different pesticides was investigated using bare TiO2 and TiO2 nanoparticles modified with polyaniline under simulated solar irradiation. Sulcotrione showed the highest percentage degradation and further experiments were related to this herbicide. Mineralization and cytotoxicity of the starting compound and intermediate species formed during the decomposition in double distilled water (DDW), as well as the efficiency of removal from various environmental waters were studied. The contents of the most abundant ions present in the River Danube were simulated in DDW and their influence was evaluated. It was found that cytotoxicity was in all cases below 11 % and the efficiency of photocatalytic degradation in environmental waters was decreased compared with DDW. Furthermore, addition of different scavengers revealed that the main path of degradation is through holes, while the presence of H2O2 decreased and KBrO3 increased the efficiency of photocatalytic degradation compared with the system without the mentioned electron acceptors.

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