Photocatalytic degradation of pentachlorophenol by N–F–TiO2: identification of intermediates, mechanism involved, genotoxicity and ecotoxicity evaluation

2015 ◽  
Vol 14 (3) ◽  
pp. 520-527 ◽  
Author(s):  
M. Antonopoulou ◽  
D. Vlastos ◽  
I. Konstantinou
Keyword(s):  
Photocatalytic Degradation ◽  
Aqueous Phase ◽  
Heterogeneous Photocatalysis

Heterogeneous photocatalysis using N–F codoped TiO2 was successfully applied for degradation, mineralization as well as for genotoxicity and ecotoxicity elimination of PCP in the aqueous phase.

Aqueous‐Phase Photocatalytic Degradation of Emerging Forever Chemical Contaminants

2021 ◽  
Vol 6 (21) ◽  
pp. 5225-5240
Author(s):  
John N. Kuhn ◽  
Yetunde Oluwatosin Sokefun
Keyword(s):  
Photocatalytic Degradation ◽  
Aqueous Phase ◽  
Chemical Contaminants

Modeling of a Flat Plate, Slurry Reactor for the Photocatalytic Degradation of 4-Chlorophenol

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
María Lucila Satuf ◽  
Rodolfo J Brandi ◽  
Alberto E Cassano ◽  
Orlando M Alfano
Keyword(s):  
Photocatalytic Degradation ◽  
Flat Plate ◽  
Radiation Effects ◽  
Heterogeneous Photocatalysis ◽  
Slurry Reactor ◽  
Catalyst Loading ◽  
Wide Range ◽  
Laboratory Scale Reactor ◽  
Uv Lamps ◽  
Intrinsic Kinetic

Heterogeneous photocatalysis employing titanium dioxide has emerged as an efficient method to remove a wide range of toxic compounds from polluted waters. In particular, chlorophenols constitute an important group of aquatic contaminants that have been successfully degraded by photocatalysis. In this work, the modeling of a slurry reactor for the photocatalytic degradation of 4-chlorophenol (4-CP) is presented. The experimental reactor is a thin rectangular parallelepiped limited by two parallel windows made of borosilicate glass. It is illuminated from one side by two tubular UV lamps (UV Philips TLK40/09N) located at the focal axis of cylindrical reflectors of a parabolic cross-section. The flat plate reactor is placed inside the loop of an isothermal, batch recycling system. The model describes the degradation of 4-CP as well as the formation and disappearance of the main intermediate products: 4-chlorocatechol (4-CC) and hydroquinone (HQ). Intrinsic kinetic expressions, previously obtained in a laboratory scale reactor, were employed to solve the mass balance for each species. To take account of the radiation effects on the reaction rate, the radiative transfer equation was solved in the flat plate reactor. The radiation model involves two spatial variables and two angular variables in the direction of radiation propagation.To validate the model, experimental runs were conducted by varying the catalyst loading (0.05, 0.1, 0.5, 1.0 x 10-3 g/cm3) and the 4-CP initial concentration (0.7 and 1.4 x 10-7 mol/cm3). Good agreement was found between simulation results and experimental data. Based on the experimental and predicted concentrations of 4-CP and 4-CC, the root mean square error (RMSE) of the model was 9.9 %.

Photocatalytic degradation of trichloroethylene in aqueous phase using nano-ZNO/Laponite composites

2013 ◽  
Vol 263 ◽  
pp. 569-574 ◽  
Author(s):  
Jin Chul Joo ◽  
Chang Hyuk Ahn ◽  
Dae Gyu Jang ◽  
Young Han Yoon ◽  
Jong Kyu Kim ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Aqueous Phase ◽  
Nano Zno

Titanium Dioxide Catalyzed Photocatalytic Degradation of Carboxylic Acids from Waste Water: A Review

2012 ◽  
Vol 712 ◽  
pp. 175-189 ◽  
Author(s):  
Vimal Gandhi ◽  
Manish Mishra ◽  
P.A. Joshi
Keyword(s):  
Waste Water ◽  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Carboxylic Acids ◽  
Chemical Process ◽  
Basic Mechanism ◽  
Heterogeneous Photocatalysis ◽  
Catalyst Loading ◽  
Process Industries ◽  
Chemical Process Industries

Among the new oxidation methods in advanced oxidation processes, heterogeneous photocatalysis based on UV/ titanium dioxide is one of the emerging technologies for degrading and totally mineralizing toxic and highly stable carboxylic acids from waste water has attracted great attention in last decade. The aliphatic and aromatic carboxylic acids are widely used as reactants or produced as main products or byproducts in various chemical process industries. These chemical process industries generates waste water containing significant amount of carboxylic acids, which need to be removed from waste water before disposal to natural water bodies due to the environmental restrictions and their hazardous effects on flora and fauna. This paper reviews photocatalytic degradation (PCD) process for various carboxylic acids in detail, including basic mechanism of titanium dioxide, effect of carboxylic acid structure and various reaction parameters like effect of initial concentration and kinetic study, catalyst loading, pH, adsorption and deactivation of the photocatalyst. A critical analysis of the available literature has been made and some general conclusions have been drawn related to the above mentioned parameters. The photocatalytic degradation pathways for carboxylic acids are also discussed to understand this process thoroughly.

scholarly journals Photocatalytic Degradation of Two Commercial Reactive Dyes in Aqueous Phase Using Nanophotocatalysts

2009 ◽  
Vol 4 (7) ◽  
pp. 709-716 ◽  
Author(s):  
Sushil Kumar Kansal ◽  
Navjeet Kaur ◽  
Sukhmehar Singh
Keyword(s):  
Photocatalytic Degradation ◽  
Aqueous Phase ◽  
Reactive Dyes

Titanium dioxide mediated photocatalytic degradation of monochlorobenzene in aqueous phase

Chemosphere ◽  
2008 ◽  
Vol 71 (2) ◽  
pp. 398-405 ◽  
Author(s):  
Hsin-Hsu Huang ◽  
Dyi-Hwa Tseng ◽  
Lain-Chuen Juang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Aqueous Phase

Comparison of UV- and UV/VUV-Induced Photolytic and Heterogeneous Photocatalytic Degradation of Phenol, with Particular Emphasis on the Intermediates

2008 ◽  
Vol 11 (3) ◽  
Author(s):  
Tünde Alapi ◽  
Krisztina Gajda-Schrantz ◽  
István Ilisz ◽  
Károly Mogyorósi ◽  
Pál Sipos ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Heterogeneous Photocatalysis ◽  
Uv Photolysis ◽  
Vuv Photolysis

AbstractThe application of UV photolysis (254 nm), UV/VUV photolysis (254/185 nm) and heterogeneous photocatalysis (TiO

Photocatalytic degradation of levofloxacin in aqueous phase using Ag/AgBr/BiOBr microplates under visible light

2017 ◽  
Vol 88 ◽  
pp. 148-155 ◽  
Author(s):  
Girish Gupta ◽  
Amandeep Kaur ◽  
A.S.K. Sinha ◽  
Sushil Kumar Kansal
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Aqueous Phase

scholarly journals Photocatalytic Degradation of Mixed Dyes in Aqueous Phase by MgAlTi and ZnAlTi Mixed Oxides

2020 ◽  
Author(s):  
Laura V. Castro ◽  
E. Ortíz-Islas ◽  
Ma. E. Manríquez ◽  
E. Albiter ◽  
Román Cabrera-Sierra ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Aqueous Phase ◽  
Mixed Oxides
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