Decomposition of a Di Azo Dye in aqueous solutions by
This study examined the photolytic degradation of C.I. Acid Red 73 AR73 diazo dye, in aqueous solution by combined UV, hydrogen peroxide and KMnO4. A continuous circulated photoreactor equipped with a low pressure mercury lamp 15 W, emission 253.7 nm was used. In the first step, potassium permanganate was used for decolourisation of AR73 dye solution. The effect of the key operating variables such as initial dye concentration, permanganate amount, pH and temperature were studied. In order to avoid the overdose of KMnO4, the stoichiometric amount of permanganate required for 1 mol of AR73 complete colour removal was determined 2.79 mol. Dye degradation efficiency was studied by monitoring Total Organic Carbon TOC at different UV irradiation times. In the acidic solution, 100 of AR73 colour removal and near 10 dye mineralization have been observed in no more than 5 minutes. In the second step, after decolourisation period, UV/H2O2 system was applied for mineralization of the dye solution. In the best operational conditions, after 180 minutes of UV irradiation time, we have observed 90 of dye mineralization. In the third step, the results of this method were compared with which obtained by using UV/H2O2 system without KMnO4 oxidative pre-treatment. It was found that under the same irradiation time 180 min, KMnO4/UV/H2O2 process is about 10 more effective for mineralization of AR73 dye solution.
Oxidation of commercial reactive azo dye aqueous solutions by the photo-Fenton and Fenton-like processes
This paper evaluates the degradation of two azo reactive dyes, C.I. Reactive Yellow 84 (RY84) and C.I. Reactive Red 120 (RR120) by photo-Fenton and Fenton-like oxidation. All experiments were performed on a laboratory scale set-up. The effects of different reaction parameters such as initial pH, contact time, effect of light and hydrogen peroxide concentrations on the oxidation of the dye aqueo...متن کامل
Background & Aims of the Study: Azo Dyes are the most hazardous materials in different industries. Dyes and pigments used in industries for applications such as textiles, leathers, papers, foodstuffs, additives, etc. Application amounts of azo dyes in industries which can cause severe health problems in human and environmental pollutant problems. So, color wastewaters decomposition plan are...متن کامل
The feasibility of employing nanofiltration (NF) in the decolorization of ionic (direct blue 86) and nonionic (disperse blue 56) dye aqueous solutions was investigated. The effects of feed concentration (60- 180 mg/l), pressure (0.5- 1.1 MPa) and pH (6- 10) were studied. Experiments were performed in a laboratory- scale set up by using a TFC commercial spiral wound polyamide nanofilter. The res...متن کامل
Adsorption of Acid blue 92 dye on modified diatomite by nickel oxide nanoparticles in aqueous solutions
Adsorbent prepared from waste plants for the treatment of dyeing effluents have high significance in environmental sustainability. In this research, adsorption of Acid Blue 92AB 92 dye from aqueous solutions on raw and modified diatomite nickel oxide nanoparticles was studied. The effect of different operation parameters such as pH, contact time, initial dye concentration, calcinations and sorb...متن کامل
Optimization of significant factors on the microbial decolorization of azo dye in an aqueous medium by Design of Experiments
Currently, the reduction of reactive dyes present in the textile effluent is a big challenge due to the threat to the environment. Existing physical and chemical methods contains many drawbacks. In the present scenario microbial reduction pays much attention and current focus of research. Therefore, the present study isolated dye decolorizing bacterium Exiguiobacterium aurantiacum (TSL7) from a...متن کامل
دوره 5 شماره 1
صفحات 41- 46
تاریخ انتشار 2012-02-18
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