scholarly journals Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

2019 ◽  
Author(s):  
Antonio Zuorro ◽  
Roberto Lavecchia ◽  
Marika Michela Monaco ◽  
Giuseppina Iervolino ◽  
Vincenzo Vaiano
Keyword(s):  
Hydrogen Peroxide ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Textile Industry ◽  
Azo Dye ◽  
Preliminary Screening ◽  
Textile Effluents ◽  
Effects Of Ph ◽  
Potential Impact ◽  
Doped Titania

The presence of azo dyes in textile effluents is an issue of major concern due to their potential impact on the environment and human health. In this study we investigate the photocatalytic degradation under visible light of Reactive Violet 5 (RV5), an azo dye widely used in the textile industry. A preliminary screening of different titania-based catalysts was carried out to identify the best candidate for RV5 removal. The selected catalyst was then tested in a stirred and aerated lab-scale reactor illuminated with a light LED source (λmax = 460 nm). The effects of pH, catalyst load and hydrogen peroxide additions on the efficiency of dye removal were evaluated. Under the best conditions (pH 10, 3 g/L of catalyst and 60 mM hydrogen peroxide), the dye solution was completely decolorized in about 2 h. Overall, the results obtained suggest that the proposed process may represent a suitable method for the removal of RV5 from textile effluents.

scholarly journals Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 645 ◽  
Author(s):  
Antonio Zuorro ◽  
Roberto Lavecchia ◽  
Marika Michela Monaco ◽  
Giuseppina Iervolino ◽  
Vincenzo Vaiano
Keyword(s):  
Hydrogen Peroxide ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Textile Industry ◽  
Azo Dye ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Textile Effluents ◽  
Effects Of Ph ◽  
Doped Titania

The presence of azo dyes in textile effluents is an issue of major concern due to their potential impact on the environment and human health. In this study we investigate the photocatalytic degradation under visible light of Reactive Violet 5 (RV5), an azo dye widely used in the textile industry. A preliminary screening of different titania-based catalysts was carried out to identify the best candidate for RV5 removal. The selected catalyst was then tested in a stirred and aerated lab-scale reactor illuminated with a blue light-emitting diode (LED) source emitting in the wavelength range of 460–470 nm. The effects of pH, catalyst load, and hydrogen peroxide additions on the efficiency of dye removal were evaluated. Under the best conditions (pH 10, 3 g/L of catalyst, and 60 mM hydrogen peroxide), the dye solution was completely decolorized in about 2 h. Overall, the results obtained suggest that the proposed process may represent a suitable method for the removal of RV5 from textile effluents.

Fabrication of a novel ZnO/MMO/CNT nanohybrid derived from multi-cationic layered double hydroxide for photocatalytic degradation of azo dye under visible light

RSC Advances ◽  
2015 ◽  
Vol 5 (25) ◽  
pp. 19675-19685 ◽  
Author(s):  
Fatemeh Khodam ◽  
Zolfaghar Rezvani ◽  
Ali Reza Amani-Ghadim
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Layered Double Hydroxide ◽  
Azo Dye ◽  
Double Hydroxide ◽  
Degradation Of Azo Dye

A facile and effective approach for assembling ZnO/MMO/CNT nanohybrid with excellent photodegradation performance under visible light is reported.

Photocatalytic Degradation of 2,4,5–TCP in TiO2/UV/H2O2 System

2012 ◽  
Vol 518-523 ◽  
pp. 2649-2652
Author(s):  
Yan Ping Zong ◽  
Xian Hua Liu ◽  
Xi Wen Du ◽  
Yi Ren Lu ◽  
Xiao Xuan Shi
Keyword(s):  
Hydrogen Peroxide ◽  
Photocatalytic Degradation ◽  
Absorption Spectroscopy ◽  
Degradation Mechanism ◽  
Analysis Method ◽  
Photocatalytic System ◽  
Initial Ph ◽  
Effects Of Ph

The photocatalytic degradation of 2,4,5–Trichlorophenol(2,4,5–TCP) in TiO2/UV/ H2O2 photocatalytic system was examined using absorption spectroscopy and GC-MS. It was found that 2,4,5–TCP could be degraded almost completely within 100 min under the conditions of initial pH 3, C(H2O2) = 0.08 mol/L and C(TiO2) = 0.5 g/L. The effects of pH and the concentration of hydrogen peroxide on the degradation of 2,4,5–TCP were also studied. Besides, the degradation mechanism was concluded accorrding to convertional analysis method too.

Modeling and Optimization of Photocatalytic Degradation of Methylene Blue Using Lanthanum Vanadate

2020 ◽  
Vol 1008 ◽  
pp. 97-103
Author(s):  
Mahmoud Samy ◽  
Mona G. Ibrahim ◽  
Mohamed Gar Alalm ◽  
Manabu Fujii
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Removal Efficiency ◽  
Textile Industry ◽  
Degradation Process ◽  
Optimum Conditions ◽  
Photo Degradation ◽  
Operational Conditions ◽  
Degradation Rates ◽  
Effects Of Ph

Methylene blue (MB) is one of the commonly used dyes in the textile industry and can be used as a model pollutant for the textile industry wastewater. In this work, the photocatalytic degradation of MB by synthesized nanoparticles of lanthanum vanadate (LaVO4) was assessed. The effects of pH, initial MB concentration and catalyst dose on the removal performance of MB were investigated and measuring the optimum values of these operational conditions was performed using response surface methodology (RSM). Catalyst dose of 0.43 g/L, initial MB concentration of 5.0 mg/L, and pH of 6.86 were found to be the optimum conditions in reaction time of 60 min. A mathematical model was formed to relate the removal efficiency of MB to the aforementioned operating parameters. The removal efficiency of MB was 91% without any scavengers at a catalyst dose of 0.3 g/L, pH of 7 and initial MB concentration of 10 mg/L. The trapping experiments confirmed the participation of different reactive species in the photo-degradation process. The degradation rates of MB were 91%, 86%, 81%, 77.70% and 72% in five successive runs using LaVO4.

Photocatalytic degradation of selected herbicides in aqueous suspensions of doped titania under visible light irradiation

2010 ◽  
Vol 179 (1-3) ◽  
pp. 49-56 ◽  
Author(s):  
Daniela V. Šojić ◽  
Vesna N. Despotović ◽  
Nadica D. Abazović ◽  
Mirjana I. Čomor ◽  
Biljana F. Abramović
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Aqueous Suspensions ◽  
Doped Titania

Anomalous behavior of visible light active TiO2for the photocatalytic degradation of different Reactive dyes

2015 ◽  
Vol 14 (11) ◽  
pp. 2024-2034 ◽  
Author(s):  
Navneet Kaur ◽  
Satwant Kaur Shahi ◽  
Vasundhara Singh
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Reactive Dyes ◽  
Structural Features ◽  
Anomalous Behavior ◽  
Light Irradiation ◽  
Textile Effluents ◽  
Degradation Of Dyes ◽  
Visible Light Active

This article illustrates important substrate–catalyst interaction studies using Reactive dyes and various modified TiO2powders under visible light irradiation and demonstrates the need for developing new catalysts for the degradation of dyes having different structural features present in textile effluents.

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