scholarly journals STUDI PENURUNAN ZAT WARNA ACID ORANGE 7 DENGAN PROSES OKSIDASI MENGGUNAKAN FERRAT (FeO4)2-

Molekul ◽  
2011 ◽  
Vol 6 (1) ◽  
pp. 30
Author(s):  
Dian Windy Dwiasi ◽  
Suyata Suyata
Keyword(s):  
Textile Wastewater ◽  
Molar Ratio ◽  
Textile Dye ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
Oxidation Processes ◽  
Dye Pollutants ◽  
Receiving Waters ◽  
Physical And Chemical ◽  
Oxidation Degradation

Colour removal from textile wastewater has been a matter of considerable interest during the last two decades, not only because of the potential toxicity of certain dyes but often due to their visibility in receiving waters and to their low biodegradability. Due to the limited success of some physical and chemical techniques for the treatment of dye effluents it is necessary to develop destructive systems leading to complete mineralization or, at least, to less harmful or easy-to-treat compounds. Oxidation processes using ferrate (FeO4)2- have been found to be very effective in the degradation of dye pollutants and for the treatment of waste waters from the textile industry.Acid Orange 7 (AO7) commonly used as a textile dye and could be degraded by ferrate oxidation processes. In the oxidation degradation of dye by ferrate process, effect of some parameters such as time, pH, and molar ratio of dye was examined at experimental condition. AO7 removal by this process was calculated to be equal to 12 minute at experimental condition. Ferrate can oxidize acid orange 7 effectively at optimum pH of 9.8, with the molar ratio of ferrate : acid orange 7 at 4:1. The percentages of acid orange 7 degradation reached to 98.9%.

scholarly journals Study of C.I. Acid Orange 7 removal in contaminated water by photo oxidation processes

2013 ◽  
Vol 10 (1) ◽  
pp. 16-23 ◽  
Keyword(s):  
Removal Efficiency ◽  
Uv Irradiation ◽  
Rate Constant ◽  
Dye Removal ◽  
Irradiation Time ◽  
Inhibitory Effect ◽  
Textile Dye ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
First Order

C.I. Acid Orange 7 (AO7) commonly used as a textile dye and could be degraded by UV/ZnO, UV/H2O2 and UV/H2O2/Fe (III) (photofenton) processes. In the photocatalytic degradation of dye by UV/ZnO process, effect of some parameters such as UV irradiation time, presence of ZnO and UV irradiation, pH, concentrations of ZnO, dye, H2O2 and ethanol was examined and first order reaction rate constant was calculated equal to 2.39×10-2 min-1 at experimental condition. The semi-log plot of dye concentration versus time was linear, suggesting first order reaction. Efficiency of photodegradation process in the absence of ZnO photocatalyst and UV light was small. Increasing the UV irradiation time increased AO7 removal. Ethanol had inhibitory effect on this process. Maximum AO7 removal was seen at neutral pH area. In the UV/H2O2 process, effect of some parameters such as presence of H2O2 and UV irradiation, amount of H2O2, effect of pH and addition of bicarbonate on the efficiency of dye removal were examined. Absence of each of UV irradiation or H2O2 decreased AO7 removal efficiency near to zero. Increasing H2O2 concentration increased dye removal to some extent but at higher H2O2 concentrations, dye removal efficiency did not increase. Increasing pH to value about 9 increased the AO7 removal efficiency and increasing bicarbonate anion concentration decreased it. Rate constant of AO7 removal by this process was calculated to be equal to 4.221×10-1 min-1 at experimental condition. Also, the order of UV/ H2O2/Fe (III) > UV/ H2O2 > UV/Fe (III) > H2O2/Fe (III), was seen for AO7 removal efficiency of these processes. Increasing Fe (III) and oxalate concentration increased dye removal efficiency.

Enzymatic Treatment and Detoxification of Acid Orange 7 from Textile Wastewater

2011 ◽  
Vol 165 (5-6) ◽  
pp. 1274-1284 ◽  
Author(s):  
Fathollah Gholami-Borujeni ◽  
Amir Hossein Mahvi ◽  
Simin Nasseri ◽  
Mohammad Ali Faramarzi ◽  
Ramin Nabizadeh ◽  
...  
Keyword(s):  
Textile Wastewater ◽  
Enzymatic Treatment ◽  
Acid Orange 7 ◽  
Acid Orange

TiO2-assisted degradation of acid orange 7 textile dye under solar light

2007 ◽  
Vol 91 (15-16) ◽  
pp. 1492-1495 ◽  
Author(s):  
Susana Flores Villanueva ◽  
Susana Silva Martínez
Keyword(s):  
Solar Light ◽  
Textile Dye ◽  
Acid Orange 7 ◽  
Acid Orange

Enhanced decolourisation of acid orange 7 in a continuous UASB reactor with quinones as redox mediators

2001 ◽  
Vol 44 (4) ◽  
pp. 123-128 ◽  
Author(s):  
F. J. Cervantes ◽  
F. P. van de Zee ◽  
G. Lettinga ◽  
J. A. Field
Keyword(s):  
Model Compound ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Molar Ratio ◽  
Anaerobic Sludge ◽  
Redox Mediators ◽  
Acid Orange 7 ◽  
Colour Removal ◽  
Acid Orange ◽  
Anaerobic Sludge Blanket

The reductive biotransformation of acid orange 7 (AO7) was explored in a lab-scale upflow anaerobic sludge blanket (UASB) reactor at low hydraulic residence times (HRT). A colour removal of 85% was achieved when the reactor was operated at a HRT of 6 hours, but decreased up to 70% when the HRT was lowered to 2 hours. Addition of the quinone model compound, anthraquinone 2,6-disulfonate (AQDS), as redox mediator, allowed for a considerably higher decolourising efficiency (>90% at all the HRT evaluated). The results indicate that the use of catalytic concentrations of AQDS (AQDS/AO7 molar ratio about 0.01) can accelerate decolourising processes achieving satisfying extent of decolourisation.

Photocatalytic Degradation of a Textile Dye by Illuminated Tungsten Oxide Nanopowder

2015 ◽  
Vol 18 (1) ◽  
Author(s):  
Azita Mohagheghian ◽  
Seyydeh-Amene Karimi ◽  
Jae-Kyu Yang ◽  
Mehdi Shirzad-Siboni
Keyword(s):  
Photocatalytic Degradation ◽  
Tungsten Oxide ◽  
Uv Irradiation ◽  
Textile Dye ◽  
Acid Orange 7 ◽  
Acid Orange

AbstractIn this study, photocatalytic degradation of Acid Orange 7 (AO7) by tungsten oxide nanopowder under UV irradiation was investigated with variation of pH, WO

scholarly journals Magnetic iron oxide/clay nanocomposites for adsorption and catalytic oxidation in water treatment applications

2020 ◽  
Vol 18 (1) ◽  
pp. 1148-1166
Author(s):  
Ganjar Fadillah ◽  
Septian Perwira Yudha ◽  
Suresh Sagadevan ◽  
Is Fatimah ◽  
Oki Muraza
Keyword(s):  
Iron Oxide ◽  
Water Treatment ◽  
Photocatalytic Oxidation ◽  
Low Cost ◽  
Synthesis Method ◽  
Chemical Oxidation ◽  
Magnetic Iron Oxide ◽  
Oxidation Processes ◽  
Recent Developments ◽  
Physical And Chemical

AbstractPhysical and chemical methods have been developed for water and wastewater treatments. Adsorption is an attractive method due to its simplicity and low cost, and it has been widely employed in industrial treatment. In advanced schemes, chemical oxidation and photocatalytic oxidation have been recognized as effective methods for wastewater-containing organic compounds. The use of magnetic iron oxide in these methods has received much attention. Magnetic iron oxide nanocomposite adsorbents have been recognized as favorable materials due to their stability, high adsorption capacities, and recoverability, compared to conventional sorbents. Magnetic iron oxide nanocomposites have also been reported to be effective in photocatalytic and chemical oxidation processes. The current review has presented recent developments in techniques using magnetic iron oxide nanocomposites for water treatment applications. The review highlights the synthesis method and compares modifications for adsorbent, photocatalytic oxidation, and chemical oxidation processes. Future prospects for the use of nanocomposites have been presented.

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