Aerobic decolorization of azo dye orange g by a new yeast isolate Candida cylindracea SJL6

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.

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

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2019.01.066 ◽

2019 ◽

Vol 246 ◽

pp. 211-220 ◽

Cited By ~ 12

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

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

Applied Sciences ◽

10.3390/app9091958 ◽

2019 ◽

Vol 9 (9) ◽

pp. 1958 ◽

Cited By ~ 5

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.

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

Acta Crystallographica Section E Structure Reports Online ◽

10.1107/s1600536810037360 ◽

2010 ◽

Vol 66 (10) ◽

pp. m1330-m1331 ◽

Cited By ~ 1

Author(s):

Alan R. Kennedy ◽

Scott C. McKellar ◽

Maurice O. Okoth

Keyword(s):

Azo Dye ◽

Orange G

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

International Journal of Photoenergy ◽

10.1155/2013/595031 ◽

2013 ◽

Vol 2013 ◽

pp. 1-12 ◽

Cited By ~ 5

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.

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