scholarly journals The cobalt(II) salt of the azo dye Orange G

2010 ◽  
Vol 66 (10) ◽  
pp. m1330-m1331 ◽  
Author(s):  
Alan R. Kennedy ◽  
Scott C. McKellar ◽  
Maurice O. Okoth
Keyword(s):  
Azo Dye ◽  
Orange G

Photocatalytic degradation of azo dye in TiO2 suspended solution

2001 ◽  
Vol 43 (2) ◽  
pp. 313-320 ◽  
Author(s):  
C.-H. Hung ◽  
P.-C. Chiang ◽  
C. Yuan ◽  
C.-Y. Chou
Keyword(s):  
Reaction Time ◽  
Light Intensity ◽  
Photocatalytic Degradation ◽  
Azo Dye ◽  
Batch Reactor ◽  
Reaction Rates ◽  
Pseudo First Order Reaction ◽  
Degradation Rates ◽  
Orange G ◽  
Degradation Of Azo Dye

The photocatalysis of azo dye, Orange G, by P-25 anatase TiO2 was investigated in this research. The experiments were conducted in a batch reactor with TiO2 powder suspension. Four near-UV lamps were used as the light source. The experimental variables included solution pH level, amount of TiO2, illumination light intensity, and reaction time. A pseudo-first order reaction kinetic was proposed to simulate the photocatalytic degradation of Orange G in the batch reactor. More than 80% of 10 mg/L Orange G decomposition in 60-minute reaction time was observed in this study and fast decomposition of Orange G only occurred in the presence of both TiO2 and suitable light energy. Faster degradation of Orange G was achieved under acid conditions. The degradation rates of Orange G at pH = 3.0 were about two times faster than those at pH = 7.0. Faster degradation of azo dye was observed for greater irradiated light intensity and more TiO present during the reaction. The reaction rates were proportional to TiO2concentration and light intensity with the power order of 0.726 and 0.734, respectively.

Highly efficient degradation of azo dye Orange G using laterite soil as catalyst under irradiation of non-thermal plasma

2019 ◽  
Vol 246 ◽  
pp. 211-220 ◽  
Author(s):  
Jean-Baptiste Tarkwa ◽  
Elie Acayanka ◽  
Bo Jiang ◽  
Nihal Oturan ◽  
Georges Y. Kamgang ◽  
...  
Keyword(s):  
Thermal Plasma ◽  
Azo Dye ◽  
Laterite Soil ◽  
Highly Efficient ◽  
Orange G ◽  
Non Thermal Plasma ◽  
Degradation Of Azo Dye

scholarly journals Decolorization of Orange-G Aqueous Solutions over C60/MCM-41 Photocatalysts

2019 ◽  
Vol 9 (9) ◽  
pp. 1958 ◽  
Author(s):  
John Kyriakopoulos ◽  
Eleana Kordouli ◽  
Kyriakos Bourikas ◽  
Christos Kordulis ◽  
Alexis Lycourghiotis
Keyword(s):  
Ascorbic Acid ◽  
Azo Dye ◽  
Dye Degradation ◽  
Dye Adsorption ◽  
Fullerene C60 ◽  
Ordered Mesoporous Silica ◽  
Semiconducting Materials ◽  
Ordered Mesoporous ◽  
Orange G ◽  
Mcm 41

The majority of the photocatalysts studied for azo-dye degradation are based on semiconductor materials. Studies reported on non-semiconducting materials are very scarce. In the present work, we studied the fullerene (C60) ability to accelerate photodegradation of the dye’s azo bond in the presence of ascorbic acid. A series of C60 supported on ordered mesoporous silica (MCM-41) catalysts, containing 1, 3, 6, 9, and 12 wt % of fullerene C60, was studied using Orange G (OG) as representative azo-dye. This study showed that partial decolorization is achieved in the dark by simple adsorption of the dye on the bare surface of the carrier. The extent of decolorization increases with the irradiation of the suspension due to photocatalytic degradation of the azo-bond. This is maximized over the sample containing 3 wt % of C60 and it has been attributed to the best combination of the extent of the dye adsorption with the high intrinsic photocatalytic activity of small C60 clusters predominated in this sample. This catalyst proved to be quite stable upon five subsequent photocatalytic cycles, losing less than 5% of its initial activity. No degradation of OG takes place in the absence of ascorbic acid.

scholarly journals Supported Zinc Oxide Photocatalyst for Decolorization and Mineralization of Orange G Dye Wastewater under UV365 Irradiation

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Ming-Chin Chang ◽  
Hung-Yee Shu ◽  
Tien-Hsin Tseng ◽  
Hsin-Wen Hsu
Keyword(s):  
Reaction Time ◽  
Azo Dye ◽  
Textile Wastewater ◽  
Color Removal ◽  
Fluorescent Light ◽  
Preparation Temperature ◽  
Steel Mesh ◽  
Toc Removal ◽  
Photocatalytic System ◽  
Orange G

To solve the environmental challenge of textile wastewater, a UV/ZnO photocatalytic system was proposed. The objective of this study was to prepare a photocatalytic system by utilizing both cold cathode fluorescent light (CCFL) UV irradiation and steel mesh supported ZnO nanoparticles in a closed reactor for the degradation of azo dye C.I. Orange G (OG). Various operating parameters such as reaction time, preparation temperature, mixing speed, ZnO dosage, UV intensity, pH, initial dye concentration, and service duration were studied. Results presented efficient color and total organic carbon (TOC) removal of the OG azo dye by the designed photocatalytic system. The optimal ZnO dosage for color removal was 60 g m−2. An alkaline pH of 11.0 was sufficient for photocatalytic decolorization and mineralization. The rate of color removal decreased with the increase in the initial dye concentration. However, the rate of color removal increased with the increase in the UV intensity. The steel mesh supported ZnO can be used repeatedly over 10 times without losing the color removal efficiency for 120 min reaction time. Results of Fourier transform infrared (FTIR) and ion chromatography (IC) indicated the breakage of N=N bonds and formation of sulfate, nitrate, and nitrite as the major and minor products. The observation indicated degradation of dye molecules.

PHYSICAL-CHEMICAL PARAMETERS INFLUENCING ELEMENTAL IRONMEDIATED REDUCTION OF THE AZO DYE ORANGE G

2003 ◽  
Vol 2003 (5) ◽  
pp. 221-233
Author(s):  
Jennie Perey Saxe ◽  
Brian L. Lubenow ◽  
Pei C. Chiu ◽  
Chin-Pao Huang ◽  
Daniel K. Cha
Keyword(s):  
Azo Dye ◽  
Chemical Parameters ◽  
Physical Chemical ◽  
Orange G

Degradation of the azo dye Orange G in a fluidized bed reactor using iron oxide as a heterogeneous photo-Fenton catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (56) ◽  
pp. 45276-45283 ◽  
Author(s):  
Yan Wang ◽  
Ricky Priambodo ◽  
Hui Zhang ◽  
Yao-Hui Huang
Keyword(s):  
Iron Oxide ◽  
Fluidized Bed ◽  
Azo Dye ◽  
Fluidized Bed Reactor ◽  
Uva Irradiation ◽  
Fenton Catalyst ◽  
Orange G

Waste iron oxide could activate H2O2efficiently under UVA irradiation to degrade Orange G in a novel fluidized bed reactor.

Decolourization of the azo dye Orange G in aqueous solution via a heterogeneous Fenton-like reaction catalysed by goethite

2012 ◽  
Vol 33 (14) ◽  
pp. 1545-1552 ◽  
Author(s):  
Honghai Wu ◽  
Xiaowen Dou ◽  
Dayi Deng ◽  
Yufeng Guan ◽  
Liguo Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Azo Dye ◽  
Heterogeneous Fenton ◽  
Orange G

scholarly journals Electrochemical degradation of Orange G in K2SO4 and KCl medium

2019 ◽  
Vol 25 (4) ◽  
pp. 571-578
Author(s):  
Hanene Hamous ◽  
Aicha Khenifi ◽  
Zohra Bouberka ◽  
Zoubir Derriche
Keyword(s):  
Electric Current ◽  
Azo Dye ◽  
Oxidation Process ◽  
Platinum Electrode ◽  
Electrochemical Degradation ◽  
Degradation Mechanisms ◽  
Visible Spectra ◽  
Orange G ◽  
Uv Visible ◽  
Degradation Time

In this work, a detailed study on the electrochemical degradation of an azo dye, Orange G is performed using a platinum electrode. Indeed, the influence of the dye concentration (50-150 mg/L), the pH of the medium and the density of the electric current is studied on the rate of discoloration, the rate of mineralization, the efficiency of the electric current and the energy consumption. The UV-visible spectra of OG plotted against the degradation time show the decrease of the intensity of the characteristic dye peaks. In an environment rich in chlorides, all peaks disappear after 15 min of degradation. However, the peaks at wavelengths of 200 and 290 nm appeared after one hour of treatment. In K<sub>2</sub>SO<sub>4</sub>, the eliminated percentages are respectively 46, 54 and 61% for wavelengths of 245, 330 and 480 nm. This suggests that the degradation mechanisms in K<sub>2</sub>SO<sub>4</sub> and KCl environments are not the same. In the middle rich in chlorides, the eliminated percentage of OG did not seem to be affected by the concentrations increase. These results confirm the hypothesis that electrochemical oxidation process is very favorable for concentrated pollutants discharge.

Studies on decolourisation of azo dye Orange G by bacterium isolated from dye contaminated sites

2021 ◽  
pp. 1-17
Author(s):  
Joan Chebet ◽  
Ramesh S. Masarbo ◽  
T. B. Karegoudar ◽  
Anand S. Nayak ◽  
Sathisha J. Gonchigar ◽  
...  
Keyword(s):  
Azo Dye ◽  
Contaminated Sites ◽  
Orange G
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