Degradation of anthraquinone dye reactive blue 4 in pyrite ash catalyzed fenton reaction (original) (raw)
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Oxidative degradation of methylene blue dye from wastewater by Fenton process
International Journal of Applied Chemical and Biological Sciences , 2022
There is something intriguing and at the same time fascinating that a simple reaction (Fe 2+ ions with H202), which was observed by H.J.H. Fenton over 110 years ago, proves to be very difficult to describe and understand. Yet the nature of oxidizing species obtained in Fenton reaction is still a subject of deliberation, which may be explained by the fact that it is very common in both chemical and biological systems in natural environment. Advance oxidation process (AOPs) show great promise for application in many wastewater treatments areas. AOPs are emerging technology that may be employed for specific goals in wastewater treatment. The Application of Advance Oxidation process (AOPs) for dyes wastewater treatment is the focus. Fenton reagents as one of AOPs were applied for the minimization of organic content of coloured synthetic wastewater. Methylene Blue (MB) Dye was used as the model organic pollutants. Fenton type process was examined in orders to established optimal operating condition (pH, Hydrogen Peroxide (H202) concentration, ferrous ion catalyst concentration (Fe 2+) [Fe 2+ ] / [H202] Fenton ratio, dye concentration and temperature for maximum degradation of the investigated simulated coloured wastewater. It was found out that optimum conditions were obtained at pH of 3, hydrogen peroxide of concentration 70mM, Iron catalyst concentration of 4mM, the Fenton ratio [Fe 2+ ] / [H202] of 1: 17.5 and temperature of 45ᵒC. Degradation of Methylene blue dye from textile wastewater using Fentons reagent is very promising since the system achieved high reaction yield, compared to other and there is no needs for special treatment.
Acta Chimica Slovenica
Oxidative treatment of a cationic dye solution, methylene blue, was investigated using magnetite nanoparticles and goethite in heterogeneous Fenton-like reaction, and ferrous ions in homogeneous Fenton-reaction. The aim was to compare the degradation efficiencies of the studied catalysts for decolorization of methylene blue solution as the model organic pollutant. Response surface methodology (RSM) was applied to determine the optimal operational conditions for magnetite/H 2 O 2 and goethite/H 2 O 2 systems. The [H 2 O 2 ] of 0.2 M, catalyst dosage of 1 g/L, pH 9.0 and reaction time of 5h were chosen by RSM. The pH value of 3.0 was used in the case of Fe +2 /H 2 O 2 system. The experimental results showed that homogeneous Fenton oxidation system was the most effective system under both acidic and neutral conditions but decreased at pH value of 9.0 due to the decrease in available Fe 2+ ions in the solution and generation of ferric hydroxide sludge. Fe 3 O 4 /H 2 O 2 system represented better removal efficiency than FeO(OH)/H 2 O 2 system that could be attributed to the presence of Fe II cations in magnetite structure and its larger surface area.
ORIGINAL ARTICLE Introduction: Dyes are visible materials and are considered as one of the hazardous components that make up industrial waste. Therefore it is removed from bodies of water, using various methods. In this regard, the Fenton oxidation process is one of the most effective ways to remove colored contaminants in aquatic environments, which has many applications today. Materials and Methods: In this empirical study, the effect of the Fenton oxidation process in the removal of the soluble synthetic dye, Reactive Red 2 (RR2), has been studied. The color removal efficiency of the Fenton process in the presence of ferrous sulfate and hydrogen peroxide at different reaction variables were studied in the Jar Test when initial concentration of the dye was 10 mg/L at constant pH = 3 and lab temperature. Results: The results showed that concentrations of hydrogen peroxide and iron ions influence the maximum removal efficiency. Conclusion: According to the survey results, Fenton oxi...
Treatment of organic pollutants by homogeneous and heterogeneous Fenton reaction processes
Environmental Chemistry Letters, 2018
Nowadays, the water ecosystem is being polluted due to the rapid industrialization and massive use of antibiotics, fertilizers, cosmetics, paints, and other chemicals. Chemical oxidation is one of the most applied processes to degrade contaminants in water. However, chemicals are often unable to completely mineralize the pollutants. Enhanced pollutant degradation can be achieved by Fenton reaction and related processes. As a consequence, Fenton reactions have received great attention in the treatment of domestic and industrial wastewater effluents. Currently, homogeneous and heterogeneous Fenton processes are being investigated intensively and optimized for applications, either alone or in a combination of other processes. This review presents fundamental chemistry involved in various kinds of homogeneous Fenton reactions, which include classical Fenton, electro-Fenton, photo-Fenton, electro-Fenton, sono-electro-Fenton, and solar photoelectron-Fenton. In the homogeneous Fenton reaction process, the molar ratio of iron(II) and hydrogen peroxide, and the pH usually determine the effectiveness of removing target pollutants and subsequently their mineralization, monitored by a decrease in levels of total organic carbon or chemical oxygen demand. We present catalysts used in heterogeneous Fenton or Fenton-like reactions, such as H 2 O 2-Fe 3+ (solid)/nano-zero-valent iron/immobilized iron and electro-Fenton-pyrite. Surface properties of heterogeneous catalysts generally control the efficiency to degrade pollutants. Examples of Fenton reactions are demonstrated to degrade and mineralize a wide range of water pollutants in real industrial wastewaters, such as dyes and phenols. Removal of various antibiotics by homogeneous and heterogeneous Fenton reactions is exemplified.
Eskişehir Osmangazi Üniversitesi Mühendislik ve Mimarlık Fakültesi Dergisi, 2021
The unconscious use of surface and ground waters and the rapid pollution of water, which is the main source of life for all living creatures as a result of drought due to global warming, pose a serious problem. The rapidly increasing world population and the need for clean water have brought up a global water crisis. The textile industry is one of the largest producers of wastewater in the world. Textile industry wastewater contains high amounts of non-biodegradable organic compounds, high concentrations of dyestuffs, salt, detergent and soap. Therefore, it is of great importance to remove organic pollutants in this wastewater. Since traditional methods are insufficient to remove organic compounds in wastewater, advanced treatment methods are required. Advanced oxidation processes (AOPs) are one of the alternative treatment methods preferred in recent years. In this study, color removal from textile industry wastewater was researched by the heterogeneous Fenton process, which is an ...
2019
ORIGINAL ARTICLE Introduction: Dyes are visible materials and are considered as one of the hazardous components that make up industrial waste. Therefore it is removed from bodies of water, using various methods. In this regard, the Fenton oxidation process is one of the most effective ways to remove colored contaminants in aquatic environments, which has many applications today. Materials and Methods: In this empirical study, the effect of the Fenton oxidation process in the removal of the soluble synthetic dye, Reactive Red 2 (RR2), has been studied. The color removal efficiency of the Fenton process in the presence of ferrous sulfate and hydrogen peroxide at different reaction variables were studied in the Jar Test when initial concentration of the dye was 10 mg/L at constant pH = 3 and lab temperature. Results: The results showed that concentrations of hydrogen peroxide and iron ions influence the maximum removal efficiency. Conclusion: According to the survey results, Fenton oxi...
DESALINATION AND WATER TREATMENT
As the exploitation of industrial waste has regained interest in recent years for economic and environmental reasons, the valorization of by-products is now part of the sustainable development. This makes it possible to enhance the ethical image of companies and establish commitment towards nature and society. Replacing some chemicals by recovered waste can help in solving the problem partially. Thus, the present work studies the use of metallurgical waste FeSO 4 •7H 2 O as a catalyst in the degradation of the black azo dye eriochrome T (EBT) by the electro-Fenton process. The powder of the FeSO 4 •7H 2 O waste was characterized by X-ray diffraction and scanning electron microscopy. The study of the effect of operating parameters on the efficiency of the EF revealed optimal values for catalyst dose (0.038 g•L-1), supporting electrolyte concentration (8 × 10-3 M) and current density (15 mA•cm-2). The 60 min treatment of 50 mg•L-1 EBT solution under optimal operating conditions led to a color and COD removal efficiency of 86.79% and 83.01%, respectively. The results obtained were promising and are of great interest for the use of FeSO 4 •7H 2 O metallurgical waste as a catalyst in the electro-Fenton process.
A review on Fenton and improvements to the Fenton process for wastewater treatment
Journal of Environmental Chemical Engineering, 2014
The increase in the disposal of refractory organics demands for newer technologies for the complete mineralization of these wastewaters. Advanced oxidation processes (AOPs) constitute a promising technology for the treatment of such wastewaters and this study presents a general review on such processes developed to decolorize and/or degrade organic pollutants. Fundamentals and main applications of typical methods such as Fenton, electro-Fenton, photo-Fenton, sono-Fenton, sonophoto-Fenton, sono-electro-Fenton and photo-electro-Fenton are discussed. This review also highlights the application of nano-zero valent iron in treating refractory compounds.
Removal of Azo Dyes From Aqueous Solution Using Fenton and Modified Fenton Processes
Health Scope, 2014
Background: Fenton (Fe 2+ and H 2 O 2) and modified Fenton (Fe 3+ and H 2 O 2) are two popular methods used in advanced oxidation processes (AOP) and degradation of persistent organic pollutants (POPs), such as dye compounds. In these processes, Fe 2+ and Fe 3+ as catalysts and H 2 O 2 as the oxidizing agent are added to the reactor. Objectives: The aim of the current study is to assess the abovementioned methods for removal of Reactive Red 198 and Blue Reactive 19 from aqueous solutions. Materials and Methods: This research was carried out using lab-scale. After preparation of RB-19 and RR-198 stock solutions (1000 ppm), optimum pH and temperature were determined within the range of (3-11) and (15°C-40°C) respectively, and specific amounts of Fe 2+ and Fe 3+ (0.8, 1, 3, 7, 14 and 32 mM) were prepared by adding FeSo 4. 7H 2 O and FeCl 3 , and H 2 O 2 30% W/W (2, 5, 11, 23, 47 and 94 mM) were added to the solutions to establish the H 2 O 2 /Fe 2+ , Fe 3+ molar ratios. Standard jar tests were conducted using jar test apparatus. After sedimentation time, samples were filtered through a 0.45 µm fiber membrane, and then final dye concentrations were measured using a UV/VIS spectrophotometer. Results: The highest dye removal efficiency in both Fenton and modified Fenton methods were obtained at the optimum pH = 3, optimum reaction time of 10 minutes, optimum temperature at 25°C and H 2 O 2 /Fe 2+ and H 2 O 2 /Fe 3+ concentrations of 11.3 and 5.1 mM, respectively. In the Fenton reaction the maximum efficiency was obtained at 94.70% and 99.31% for reactive red 198 and reactive blue 19, respectively. Moreover, by the modified Fenton method the maximum removal efficiency for reactive red 198 and reactive blue 19 was 94.8% and 99.43%. Conclusions: Fenton and modified Fenton processes could be used as very effective methods for removal of reactive red 198 and blue reactive 19 from aqueous solutions.