Color And COD Degradation of Procion Red Synthetic Dye by Using Fenton-TiO2 Method (original) (raw)
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Degradation of Reactive Dyes Using Advanced Oxidation Method
CLEAN – Soil, Air, Water, 2015
In this study, the photo‐Fenton process was used to identify degradation conditions of Reactive Blue 19 (RB19) and Reactive Red 21 (RR21). The effects of pH, initial H2O2 and FeSO4 concentrations, time, and UV light intensity in determining the degradation rate were studied. The optimal conditions for the degradation of 0.156 mmol L−1 RB19 and 0.036 mmol L−1 RR21 in water were found to be: pH 4, 0.1 mL 30% H2O2 for RB19 and RR21, 0.2 mL 0.5% FeSO4 for RB19 and 0.1 mL 0.5% FeSO4 for RR21, 20 mL volume, and a temperature of 20°C. Optimal conditions were applied to synthetic dye wastewater using small amounts of H2O2 in 1 L for degradation. The degree of degradation efficiency of synthetic wastewater by the photo‐Fenton process was found to be >95% within 10 min.
IOP Conference Series: Materials Science and Engineering
One area that is developing in Indonesia is in the area of textile industry. These industries absorb a lot of labor and contribute to the country's foreign exchange but have a negative impact in the form of wastewater produced. The wastewater produced generally contains synthetic dyes such as Reactive Red 2 (RR2). This synthetic coloring material will pollute the environment if it is not well treated first before being discharged into the environment. In this study, RR2 will be used as a pollutant model. RR2 will be treated by several methods. Pollutant concentration is an important parameter in determining the most appropriate treatment method. The purpose of this research was to study the effect of RR2 initial concentration on reducing COD and color using Fenton, Fenton/TiO2, Fenton/UV, and Fenton/TiO2/UV methods. RR2 concentration was varied between 150-300 ppm. As the results, RR2 concentration from 150-300 ppm does not significantly affect the percentage of color degradation. However, at high concentration of 250 and 300 ppm, the percentage of COD degradation decrease by increasing concentration of RR2. When using 150 ppm of RR2, the highest COD and color degradation of 98.8 % and 89.5 %, respectively were achieved by using the Fenton/TiO2/UV methods.
Removal of Terasil Red R dye by using Fenton oxidation: a statistical analysis
Desalination and Water Treatment, 2013
The Fenton oxidation is one of the advanced oxidation processes (AOPs) that produce hydroxyl radicals with the aid of ferrous ions as catalyst. This treatment method was used to study the treatment efficiency of 100 mg/L synthetic dye wastewater comprises of a disperse dye commercially named as Terasil Red R. The treatment efficiency was determined in terms of percentage chemical oxygen demand (COD) removal and percentage color removal. Statistical design of experiment was employed to obtain optimal operating parameters. The optimal parameters were pH 3.5 and H 2 O 2 /Fe(II) molar ratio of 4. With this optimal condition, the Fenton oxidation was capable to achieve 93% of COD removal and more than 99% of color removal. The process was optimized with 3 2 factorial design and the interaction (dependent) between pH and molar ratio were found to be significant from the analysis of variance (ANOVA).
Degradation of Azo Dye Reactive Black 5 and acid orange 7 by Fenton-like mechanism
Colored wastewater is one of the most important sources of environmental pollution and because of their visibility and bearing toxic chemicals, it is very important to be treated before released into the environment. In recent years, several methods have been used for treatment of dyestuff effluents. In this work, removal of two azo dyes, Acid Orange 7 and Reactive Black 5 as an indicator of synthetic dyes by Fenton-like reaction were studied. In this process, 0 OH radicals will be generated by using 0 Fe and UV light, so it can occur without the addition of hydrogen peroxide. Various parameters such as pH, amount of iron powder, initial dye concentration, UV light and contact time were studied in terms of their effect on the reaction progress. It is observed that high removal of dyes for UV system was obtained at pH=11, while in the 0 Fe and 0 Fe /UV system, high removal occurred at pH=3. Removal of dye was increased by increasing the iron mass and contact time. High removal of dye was the at time equivalent of 120 min and reached equilibrium. Initial dye concentration has different effect for Acid Orange 7 and Reactive Black 5 removal. Increasing the initial dye concentration of
2016
In this study Advanced oxidation process using Fenton reagents is considered for the application of textile dye-house wastewater treatment. A representative basic dye-house wastewater sample has been brought from K.K. Textile Factory and its characteristic is analyzed and the result shows that dye-house wastewaters, containing basic dyes, are hazardous to the environment since their COD & BOD values are higher than the free discharge limit values and also they are highly colored even at the lower dye concentration operation cases. After characterizing the wastewater, advanced oxidation of a Basic Blue 41 dyes using solar -Fenton treatment was investigated in batch experiments using Box–Behnken statistical experiment design and the response surface analysis. Dyestuff, H2O2 and Fe2+ concentrations were selected as independent variables in Box– Behnken design while color and COD removal were considered as the response functions. Color removal increased with increasing H2O2 and Fe2+ con...
Journal of Hazardous Materials, 2007
In this study advanced oxidation processes (AOPs), UV/TiO 2 , UV/ZnO and photo-Fenton, were applied in order to degrade C.I. Reactive Red 45 (RR45) dye in aqueous solution. The effects of key operating parameters, such as initial pH, catalyst and hydrogen peroxide dosage as well as the effect of initial dye concentration on decolorization and mineralization extents were studied. Primary objective was to determine the optimal conditions for each of the processes. The influence of added zeolite on the process efficiency was also studied. UV/vis spectrophotometric and total organic carbon (TOC) measurements were performed for determination of decolorization and mineralization extents. It has been found that photo-Fenton process was the most efficient with 74.2% TOC removal and complete color removal achieved after a 1 h treatment.
Catalytic Oxidation Process for the Degradation of Synthetic Dyes: An Overview
International Journal of Environmental Research and Public Health
Dyes are used in various industries as coloring agents. The discharge of dyes, specifically synthetic dyes, in wastewater represents a serious environmental problem and causes public health concerns. The implementation of regulations for wastewater discharge has forced research towards either the development of new processes or the improvement of available techniques to attain efficient degradation of dyes. Catalytic oxidation is one of the advanced oxidation processes (AOPs), based on the active radicals produced during the reaction in the presence of a catalyst. This paper reviews the problems of dyes and hydroxyl radical-based oxidation processes, including Fenton’s process, non-iron metal catalysts, and the application of thin metal catalyst-coated tubular reactors in detail. In addition, the sulfate radical-based catalytic oxidation technique has also been described. This study also includes the effects of various operating parameters such as pH, temperature, the concentration ...
Catalysis Today, 2005
The aim of this work was to study the possibility of treating an industrial semiconductor wastewater by combining physical and chemical methods. The combined treatment consisted of pH adjustment to 2 followed by filtration and then chemical oxidation with Fenton reagent over the resulting filtered wastewater. In chemical oxidation treatment, the isolated effect of the variables on the degradation of the organic compounds -measured by chemical oxygen demand (COD) removal -was first studied: pH (3 to 5), reaction time (0.25 to 5 hours), hydrogen peroxide concentration (2.1 to 5.9 M) and FeSO 4 : H 2 O 2 mass ratio (1:5 to 3:2). Higher COD removal (75%) was obtained when a pH value of 3, reaction time of 4 hours, hydrogen peroxide concentration of 4.2 M and FeSO 4 : H 2 O 2 mass ratio of 1:5 were used. The global efficiency of COD removal by combination of the two treatments was 80%. The influence of three variables and their interactions was evaluated, using an experimental design of the type 2 3 . The design also allowed the conclusion that reaction time has a statistical meaning.