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Статті в журналах з теми "Fenton-like reaction"
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Dugandzic, Ana, Andjelka Tomasevic, Dunja Dabic, et al. "Degradation of nicosulfuron using fenton and fenton-like reactions." Chemical Industry and Chemical Engineering Quarterly 24, no. 3 (2018): 201–8. http://dx.doi.org/10.2298/ciceq170617032d.
Повний текст джерелаАнотація:
Nicosulfuron, a sulfonylurea herbicide, was subjected to different Fenton reactions at pH of a nicosulfuron aqueous solution (pH 5). Usually, the optimal pH for the Fenton reaction is between 3 and 4, but the addition of acids is not environmentally acceptable. This is the reason why the reactions were performed at a higher pH value than usual. So, classical Fenton and Fenton-like reactions were applied as well as photo-Fenton and photo-Fenton-like reactions. In addition, microwave Fenton and Fenton-like reactions were used in nicosulfuron degradation. Influences of Fe2+ and Fe3+ concentrations, as well as hydrogen peroxide concentrations, were studied. The Fenton reaction was much faster and more efficient than the Fenton-like reaction, while the photo- Fenton reaction proceeded much faster and more efficiently than the Fenton reaction. The microwave-Fenton and microwave-Fenton-like reactions proceeded with increased efficiency in comparison to the Fenton and Fenton-like reactions. The phytotoxicity and acute toxicity of the reaction products of nicosulfuron oxidation by the photo-Fenton reaction were analyzed. The toxicity testing of nicosulfuron treatment by photo-Fenton process showed a decrease in phytotoxicity, while the acute toxicity tests showed that the samples after treatment had lower toxicity.
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Zhang, Min Dong, Yan Fei Wei, and Mei Huang. "Treatment of Dye Wastewater by Nano-Ferrous Modified Bentonite Assisted Advanced Oxidation Processes." Advanced Materials Research 486 (March 2012): 104–7. http://dx.doi.org/10.4028/www.scientific.net/amr.486.104.
Повний текст джерелаАнотація:
Degradation of dye wastewater was studied by using nanoferrous modified bentonite as the heterogeneous catalyst for a Fenton-like oxidation. By comparing the effect of homogeneous Fenton reactions as well as heterogeneous Fenton-like process for nanomodified bentonite, it is found that the advanced oxidation processes assisted by nanoferrous/bentonite complexes exhibit the stronger degradation capacity. And the removal rate of Fenton-like reaction increased from 23.6% to 75.5% when the ferrous concentration increasing from 20 to 100mmol/L. Being compared with homogeneous Fenton reactions, 20% increased degradation efficiencies is obtained by Fenton-like oxidation process for nanomodified bentonite under 6g nanoferrous/bentonite complexes in 100mL dye wastewater.
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Prousek, Josef. "Fenton chemistry in biology and medicine." Pure and Applied Chemistry 79, no. 12 (2007): 2325–38. http://dx.doi.org/10.1351/pac200779122325.
Повний текст джерелаАнотація:
Various aspects of the participation of Fenton chemistry in biology and medicine are reviewed. Accumulated evidence shows that both hydroxyl radical and ferryl [Fe(IV)=O]2+ can be formed under a variety of Fenton and Fenton-like reactions. Some examples of metal-independent hydroxyl radical production are included. Extracellular Fenton reaction is illustrated by the white rot and brown rot wood-decaying fungi. The natural and practical utilization of catechol-driven Fenton reaction is also presented.
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Luo, Cong, and De Li Wu. "Heterogenous Fenton-Like Oxidation of Reactive Black 5 in Water Using Pyrite Cinder." Advanced Materials Research 726-731 (August 2013): 1867–71. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1867.
Повний текст джерелаАнотація:
As the Fenton-like oxidation reaction based on iron-bearing minerals could solve some problems of the traditional Fenton oxidation reaction, it became a talking point in academic circles worldwide recently. For the Fenton-like reaction, catalyst selection is an important research parameter. The new Fenton-like reaction uses iron-bearing cinder as catalyst by employing Reactive Black 5 (RB5), the object of investigation, as the target pollutant. By examining the dosage of catalyst, hydrogen peroxide, initial pH, reaction time, concentration of pollutants, optimized reaction conditions can be obtained. Results show that pyrite cinder gives rise to high catalytic activity in the Fenton-like reaction. When 5ml/L of hydrogen peroxide and 10g/L of cinder were added to 75mg/L of dye, the removal rate of RB5 was found to be 96% in 4 hours. Compared to the traditional Fenton reaction, it has a wider pH range and higher catalytic oxidation activity, especially under alkaline condition.
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Wang, Dianzhan, Ye Gu, Zhaoshun Yang, and Lixiang Zhou. "Synthesis and assessment of schwertmannite/few-layer graphene composite for the degradation of sulfamethazine in heterogeneous Fenton-like reaction." Royal Society Open Science 7, no. 7 (2020): 191977. http://dx.doi.org/10.1098/rsos.191977.
Повний текст джерелаАнотація:
Schwertmannite (sch), an iron oxyhydrosulfate mineral, can catalyse a Fenton-like reaction to degrade organic contaminants, but the reduction of Fe(III) to Fe(II) on the surface of schwertmannite is a limiting step for the Fenton-like process. In the present study, the sch/few-layer graphene (sch–FLG) composite was synthesized to promote the catalytic activity of sch in a Fenton-like reaction. It was found that sch can be successfully carried by FLG in sch–FLG composite, mainly via the chemical bond of Fe–O–C on the surface of sch–FLG. The sch–FLG exhibited a much higher catalytic activity than sch or FLG for the degradation of sulfamethazine (SMT) in the heterogeneous Fenton-like reaction, which resulted from the fact that the FLG can pass electrons efficiently. The degradation efficiency of SMT was around 100% under the reaction conditions of H 2 O 2 200–500 mg l −1 , sch–FLG dosage 1–2 g l −1 , temperature 28–38°C, and initial solution pH 1–9. During the repeated uses of sch–FLG in the Fenton-like reaction, it maintained a certain catalytic activity for the degradation of SMT and the mineral structure was not changed. In addition, SMT may be finally mineralized in the Fenton-like reaction catalysed by sch–FLG, and the possible degradation pathways were proposed. Therefore, the sch–FLG is an excellent catalyst for SMT degradation in a heterogeneous Fenton-like reaction.
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Yan, Peng, Lin Bo Gao, and Wei Tao Li. "Microwave-Enhanced Fenton-Like System, Fe3O4/H2O2 for Rhodamine B Wastewater Degradation." Applied Mechanics and Materials 448-453 (October 2013): 834–37. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.834.
Повний текст джерелаАнотація:
Fenton reactions have been increasingly applied to emergent pollutants degradation. Although homogeneous reaction by classical Fenton enables organic wastewater degradation, long treatment time and high iron catalyst concentrations are needed, raising environmental concerns. This paper proposed an innovative and cheap solution to degrade Rhodamine B (RmB) by combining magnetic nanomaterials of Fe3O4as the catalyst with microwave-enhanced fenton-like system. The main operational parameters were optimized systematically (hydrogen peroxide concentration; Fe3O4dosage; catalyst cycles; reaction time and reaction temperature). The degradation rate of Rhodamine B was increased and accelerated due to the assistance of microwave irradiation, with value of 99% after heated for only 5 min, even higher than that of treated by traditional Fenton process for 20 min. Moreover, six cyclic tests for Rhodamine B degradation showed that the magnetic catalyst was very stable, recoverable, highly active, and easy to separate using an external magnet. Hence, microwave-enhanced Fenton-like system with magnetic nanomaterials of Fe3O4as the catalyst has potential use in organic pollutant removal.
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Sarmento, Antover Panazzolo, Alisson Carraro Borges, Antonio Teixeira de Matos, and Lincoln Lucílio Romualdo. "Sulfamethoxazole and Trimethoprim Degradation by Fenton and Fenton-Like Processes." Water 12, no. 6 (2020): 1655. http://dx.doi.org/10.3390/w12061655.
Повний текст джерелаАнотація:
In this work, the degradation of sulfamethoxazole (SMX) and trimethoprim (TMP) via Fenton and Fenton-like processes was evaluated using Mn2+ as supporting catalyst in the Fenton reaction. The optimum conditions of degradation were also evaluated. Besides that, the effect of independent factors pH, [H2O2], [Fe2+], [Mn2+] and reaction time (t) on the efficiency of the SMX and TMP degradation were assessed. Box–Behnken was the experimental design adopted, delineating the relative concentration (C/Co) of antibiotics after treatments as response variable. The inferences were conducted using variance analysis, Pareto chart, response surface methodology, and desirability function. Due to the lack of adjustment of the SMX degradation model, there are no more inferences about it. The significant variables (p ≤ 0.05) on TMP degradation were: reaction time quadratic and linear effect, [Fe2+] linear effect, [Mn2+] linear effect, interaction pH vs. [Mn2+]. The Mn2+ addition aided TMP degradation in environments with lower pH values. However, the addition may harm the efficiency of the antibiotic degradation at higher pH. The optimum condition for TMP degradation in the conventional process (without the addition of Mn2+) is: pH 5, [H2O2] equal to 4.41 mmol L−1, [Fe2+] equal to 0.81 mmol L−1 and 90 min reaction time.
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Kuo, Chao-Yin, and Chueh-Ying Pai. "Application of cuprous oxide synthesized from copper-containing waste liquid to treat aqueous reactive dye." Water Science and Technology 65, no. 9 (2012): 1557–63. http://dx.doi.org/10.2166/wst.2012.047.
Повний текст джерелаАнотація:
Cuprous oxide that was prepared from Cu-containing waste liquid from a printed circuit board manufacturer was used to carry out Fenton-like and photo-Fenton-like oxidation reactions to decolorize a reactive dye (RB19). A microwave hydrothermal method was applied in the synthesis. The highest recovery rate of Cu from wastewater was 87% and was obtained when the synthesis was performed at a power of 200 W for 15 min. An RB19 decolorization efficiency of 99.9% was achieved when the Fenton-like reaction was conducted with 50 mmol/L H2O2 and 0.9 g/L of Cu2O. The decolorization of RB19 was more effective when the system was irradiated with visible light than with UV light. Under irradiation, the decolorization rate was the highest when the decolorization was performed in the RB19 solution that contained 50 mmol/L H2O2 and 0.9 g/L CuO2 in the Fenton-like and the 365 nm-irradiated photo-Fenton-like reactions. In the case of irradiation under 410 nm visible light, the system was operated with lower H2O2 (30 mmol/L) and Cu2O (0.5 g/L) to achieve a decolorization rate higher than 365 nm-irradiated photo-Fenton-like reactions.
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You, Junqing, Xihui Zhang, and Jinglei Chen. "Degradation of Antibiotics by Fenton-like Reaction Catalyzed by Iron Oxide." Advances in Materials Science and Engineering 2022 (July 30, 2022): 1–11. http://dx.doi.org/10.1155/2022/6849818.
Повний текст джерелаАнотація:
In recent years, antibiotics have been widely used in the treatment of human and animal diseases due to their effectiveness. Most antibiotics enter the environment in the form of primitive or metabolites, making them new environmental pollutants, destroying the ecological environment, and endangering human health. The Fenton method is one of the advanced oxidation technologies including the traditional Fenton method and various Fenton methods. It has a good effect on the degradation of antibiotics in wastewater. Among them, the Fenton-like method has been widely studied by scholars because of its wide pH reaction conditions and better degradation efficiency. This article takes the Fenton-like reaction as the research object to study the catalytic and promotion effect of iron oxide as a catalyst on the degradation of antibiotics in the Fenton-like reaction. The experimental results show that the iron oxide catalytic system is much better than the traditional ferrous ion-catalyzed Fenton system to degrade antibiotics. Under certain experimental conditions, the degradation rate of ofloxacin in the Fe3O4-H2O2 reaction system for 72 hours reached 79.3%.
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Xin, Ling, Jiwei Hu, Yiqiu Xiang, et al. "Carbon-Based Nanocomposites as Fenton-Like Catalysts in Wastewater Treatment Applications: A Review." Materials 14, no. 10 (2021): 2643. http://dx.doi.org/10.3390/ma14102643.
Повний текст джерелаАнотація:
Advanced oxidation (e.g., fenton-like reagent oxidation and ozone oxidation) is a highly important technology that uses strong oxidizing free radicals to degrade organic pollutants and mineralize them. The fenton-like reactions have the characteristics of low cost, simple operation, thorough reaction and no secondary pollution. Fenton-like reagents refer to a strong oxidation system composed of transition metal ions (e.g., Fe3+, Mn2+ and Ag+) and oxidants (hydrogen peroxide, potassium persulfate, sodium persulfate, etc). Graphene and carbon nanotube possess a distinctive mechanical strength, flexibility, electrical and thermal conductivity and a very large specific surface area, which can work as an excellent carrier to disperse the catalyst and prevent its agglomeration. Fullerene can synergize with iron-based materials to promote the reaction of hydroxyl groups with organic pollutants and enhance the catalytic effect. Fenton-like catalysts influence the catalytic behavior by inducing electron transfer under strong interactions with the support. Due to the short lifespan of free radicals, the treatment effect is usually enhanced with the assistance of external conditions (ultraviolet and electric fields) to expand the application of fenton-like catalysts in water treatment. There are mainly light-fenton, electro-fenton and photoelectric-fenton methods. Fenton-like catalysts can be prepared by hydrothermal method, impregnation and coordination-precipitation approaches. The structures and properties of the catalysts are characterized by a variety of techniques, such as high-resolution transmission electron microscopy, high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption near-edge structure spectroscopy. In this paper, we review the mechanisms, preparation methods, characterizations and applications status of fenton-like reagents in industrial wastewater treatment, and summarize the recycling of these catalysts and describe prospects for their future research directions.
Дисертації з теми "Fenton-like reaction"
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Soltau, Carl Peter. "Nitroxide trapping of radical species formed from the reaction of sulfoxides with reactive oxygen species." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/210339/1/Carl_Soltau_Thesis.pdf.
Повний текст джерелаАнотація:
This project focussed on an in-depth evaluation of an established methodology that uses dimethyl sulfoxide (DMSO) as a reactive solvent with a profluorescent nitroxide (PFN) to detect and quantify particulate matter-derived ROS (Reactive Oxygen Species). Additionally, a novel approach which utilized cyclic sulfoxide tetrahydrothiophene-1-oxide (THTO) as the reactive solvent was investigated. The reactions of these sulfoxides with ROS generated from multiple sources in the presence of nitroxide radical scavengers were investigated. The results of these experiments show that nitroxides can display much broader reactivity than the simple radical scavenging processes that have previously been accepted.
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Mwebi, Nixon O. "Fenton & Fenton-like reactions the nature of oxidizing intermediates involved /." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/2935.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--University of Maryland, College Park, 2005.<br>Thesis research directed by: Chemistry. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Cruz, Gonzalo Angel. "Synthesis and performance of heterogeneous catalysts for Fenton-like and photo-Fenton-like reactions at circumneutral pH." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/404350.
Повний текст джерелаАнотація:
As an essential resource for life and most human activities, water resources protection have become one of the major focuses of scientific community, especially the increasing occurrence of emerging pollutants which have its origin in commonly used pharmaceuticals, personal care products, pesticides and some other anthropogenic origin compounds.
Fenton and photo-Fenton are advanced oxidation processes (AOPs) that have been widely proved on the removal of these compounds, but they are conventionally applied at acidic pH, below 3.0, because these processes involve the use of iron (II) salts, which are not soluble above. Also, the acidic effluents must be neutralized and high amounts of iron sludge are formed in the process.
Current research in the field tries to solve this drawback by focusing in two possible solutions: the use of chelating agents to keep iron soluble at circumneutral pH or the use of heterogeneous catalysts containing iron that can be easily removed and reused after its application.
This work is focused on the study, application and improvement of alginate-based heterogeneous catalysts for conducting photo-Fenton reactions at circumneutral pH.
Initially, the preparation process of the conventionally used Fe(III)/alginate catalyst was optimized by evaluating the effect of the parameters involved on its synthesis. Then, the synthetized catalyst was applied to the abatement of antibiotic sulfamethoxazole (SMX), which was used as reference compound. The reaction mechanism of alginate-based catalysts was proposed according to the results obtained. Also, a deep study about catalyst stability revealed a high dependence with water’s pH. Fe(III)/alginate catalyst proved to release iron when sample’s pH was below alginate’s pKa. Also, due to its organic nature, a significant HO· scavenging effect of alginate itself was observed, which reduced the effective amount of hydroxyl radicals available for the oxidation of the target compound.
Fe(III)/alginate was also tested for disinfection by adjusting the conditions to ensure a minimal iron release. Thus, the contribution of homogeneous reaction was significantly avoided. The catalyst proved being able to be used for disinfection of waters with low organic loads.
In order to improve the Fe(III)/alginate catalyst, some modifications were applied. The first one was the addition of a dehydration stage after its synthesis. The resulting catalyst was tested on the removal of SMX and had a similar effectiveness than the conventionally used Fe(III)/alginate but with a significantly lower iron release, which confirmed its improved stability. This more stable catalyst was also modified by including TiO2, zero valent iron (ZVI) particles or cerium on its structure with the aim of, not only increase its stability, but its
effectiveness. The TiO2 catalyst proved to increase the effectiveness of the overall removal of SMX while the other two modifications did not.
Red volcanic rocks, iron shavings from metallurgical industry, a commercial Fe/Mn/O catalyst and a self-synthetized Fe/Ce/O catalyst were also tested as heterogeneous catalysts for Fenton and photo-Fenton at acidic and neutral pH. These catalysts were selected as inorganic-based ones and were compared to the Fe(III)/alginate dehydrated catalyst when applied to photo- Fenton at neutral pH. Results proved that only volcanic rocks had a significant activity when applied for photo-Fenton at neutral pH, but the effectiveness on the removal of SMX was low in comparison to the alginate-based catalyst. All other catalysts presented too low activity or major drawbacks that made them not suitable for water purification through Fenton-like and photo-Fenton-like processes.<br>Los procesos Fenton y foto-Fenton son procesos de oxidación avanzada (POA) que se basan en la descomposición del peróxido de hidrógeno catalizada por sales de hierro (II), produciendo radicales hidroxilo que son altamente oxidantes. El segundo además incorpora la irradiación con luz ultravioleta en el rango A, cosa que permite acelerar el proceso debido a la recuperación del hierro (II), que durante la reacción principal pasa a hierro (III). Estos procesos se suelen llevar a cabo a pH ácido (pH<3) debido a la baja solubilidad y la poca actividad de las especies de hierro a pH cercanos a la neutralidad.
Este trabajo se centra en el estudio y aplicación de un catalizador heterogéneo de Fe/alginato formado gracias a la propiedad del alginato de formar geles sólidos en presencia de cationes di y trivalentes. En este caso, el Fe(III) actúan como enlace entre cadenas de alginato.
Inicialmente se estudió el proceso de fabricación de este catalizador y se propuso un proceso estándar optimizado para su uso aplicado a la reacción foto-Fenton.
Posteriormente se evaluó su aplicación a la eliminación del antibiótico sulfametoxazol y a la desinfección de bacterias Escherichia Coli. Basándose en los resultados obtenidos se propuso un mecanismo de reacción que además explicaba la inestabilidad observada experimentalmente que producía la liberación de hierro dependiendo del pH del medio de reacción, lo que desencadenaba la vía de reacción homogénea.
Con la intención de mejorar la estabilidad del catalizador, se modificó el proceso de síntesis añadiendo una etapa de deshidratación controlada al final del proceso. Los resultados en su prueba para la reacción foto-Fenton aplicada a la eliminación de sulfametoxazol mostraron que el rendimiento no empeoraba pero mejoraba significativamente su estabilidad.
Para aumentar su eficiencia se probó incorporar cerio, partículas de hierro monovalente y TiO2. Los resultados mostraron que solo el catalizador modificado con TiO2 mejoraba el rendimiento global de la reacción.
Por último, se probaron otros catalizadores heterogéneos (piedras volcánicas, Fe/Ce/O, Fe/Mn/O, limaduras de hierro) aplicados a la reacción foto-Fenton. Solo las piedras volcánicas mostraron actividad catalítica y ésta, en comparación con la del catalizador de alginato fue baja.
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Gao, Zhengfeng. "Multifunctional 2D nanomaterials for antibacterial and anticancer applications." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF033.
Повний текст джерелаАнотація:
L’oxyde de graphène (GO) et le δ-FeOOH, réputés pour leur biocompatibilité, leurs grandes surfaces spécifiques et leur facilité de fonctionnalisation, présentent un potentiel prometteur pour des applications biomédicales, notamment dans la lutte contre les infections bactériennes et le traitement du cancer.Cette thèse a exploré la synthèse, la fonctionnalisation et les applications de ces matériaux bidimensionnels (2D). Le premier projet a consisté à fonctionnaliser le GO avec des peptides antimicrobiens (AMPs) en utilisant la chimie Click pour améliorer son activité antibactérienne, une stratégie utilisant des polymères ramifiés s’étant avérée particulièrement efficace pour améliorer l’activité antibactérienne. Le deuxième projet a tenté d'accroître l’efficacité antibactérienne du GO en liant à sa structure des composés d'ammonium quaternaire (QACs). Cependant, cette approche n’a pas réussi à surpasser l’efficacité des composants individuels. Le troisième projet a exploré l’utilisation du δ-FeOOH et de ses dérivés dans des réactions de type Fenton pour des thérapies potentielles contre le cancer. Globalement, la recherche menée dans cette Thèse souligne la nécessité d'optimiser les stratégies de fonctionnalisation afin d'équilibrer la biocompatibilité et l’efficacité, tout en explorant les capacités des nouveaux matériaux ferreux 2D dans les applications biomédicales<br>Graphene oxide (GO) and δ-FeOOH, notable for their biocompatibility, high surface area, and ease of functionalization, show promising potential for biomedical applications, specifically in combating bacterial infections and treating cancer.This thesis explored the synthesis, functionalization, and applications of these two-dimensional (2D) materials. The first project concerned functionalizing GO with antimicrobial peptides (AMPs) using the Click chemistry to enhance its antibacterial activity, with one strategy using branched polymers proving to be particularly effective in enhancing the antibacterial efficacy. The second project attempted to improve the antibacterial effectiveness of GO by attaching to its structure quaternary ammonium compounds (QACs). However, this approach failed to exceed the efficacy of the single individual components. The third project explored the use of δ-FeOOH and its derivatives in Fentonlike reactions for potential cancer therapies. Overall, the research explored in this Thesis emphasizes the need to optimize the functionalization strategies to balance the biocompatibility and the efficiency, while also exploring the capabilities of novel iron-based 2D materials in biomedical application
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CHEN, WEI-YI, and 陳偉一. "The production of hydroxyl radicals during Fenton-like reaction." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/32475041077955707532.
Повний текст джерелаАнотація:
碩士<br>國立屏東科技大學<br>環境工程與科學系<br>90<br>In situ Fenton-like oxidation injects hydrogen peroxide to the subsurface to promote the production of hydroxyl radicals and oxidation of organic contaminants. The production of hydroxyl radicals, though the catalysis of H2O2 by iron oxyhyroxyl minerals, is the key of Fenton-like reaction.
In this research, the rate and yield of hydroxyl radicals produce during the Fenton-like oxidation catalyzed by different iron oxyhydroxyl materials was quantify. Nitrobenzene was used as a chemical probe for Fenton-like reaction. Equations and constants derived from reference papers were used to calculate the rate and yield of hydroxyl radicals production. The results from TEM, XRD, and chemical analysis indicate that the type of iron oxyhydroxyl minerals in test media A and B was goethite, while that in medium C was mainly ferrihydrite. The production rate of hydroxyl radicals did not increased proportional to the H2O2 depletion rates at low H2O2 doses. The highest hydroxyl radical production rate was 1.2×10-6 M/min at H2O2 of 0.01％. The production rate of hydroxyl radicals decreased when H2O2 concentrations were increased from 0.01％ to 0.5％, and then rebound slightly when the H2O2 concentration was farther increased. There were high hydroxyl radicals produce in low H2O2 concentration (0.01％), in other words, low H2O2 concentration has high useful efficiency each unit. Hence, the yield of hydroxyl radicals increased with nitrobenzene concentration when different iron minerals catalysis.
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陳韋舜. "The reaction constants between hydroxyl radicals and chlorinated ethylene during fenton-like reaction." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/81281940821919194909.
Повний текст джерелаАнотація:
碩士<br>國立屏東科技大學<br>環境工程與科學系<br>91<br>The contamination of groundwater and subsurface soils still poses a significant problem even after two decades of research and implementation. In situ Fenton-like oxidation injects hydrogen peroxide to produce hydroxyl (HO.) radicals to mineralize organic contaminants. The hydroxyl radical is the major oxidant in this process and each contaminant has it own reaction rate constant (KHO.,P) with HO. radicals. In this research, the Fenton-like oxidation catalyzed by synthetic goethite and an aquifer sand containing natural goethite was conducted. Equations and constants derived from reference papers were used to calculate the HO. production and KHO.,P for several chlorinated ethylene contaminants.
The results showed that the yield of HO. radicals was in the order of 10-12 mM for goethite, and irrelevant to the initial H2O2 doses. However, higher H2O2 doses were required in aquifer sand to produce the similar quantity of HO. radicals. The molar transformation ratios of H2O2 to HO. radicals for different iron oxides ranged from 10-15 to 10-13. The yield and production rate of HO. radicals would be better than the first order decay constant of H2O2 for evaluating the catalytic capability of iron oxides during Fenton-like reaction.
The H2O2 dose and characteristics of goethite did not affect the KHO.,P values of chlorinated ethylene compounds. The KHO.,P values for chlorinated ethylene were in the order of PCE＞TCE＞Trans 1,2-DCE＞1,1-DCE＞ Cis 1,2-DCE, and was found to be proportional to the octanol-water partition coefficient (Kow) of chlorinated ethylene contaminants.
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Fengyuan, Xie, and 謝豐遠. "Fenton-like reaction and adsorption of dyes by using Chungli laterite." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2jvam3.
Повний текст джерелаАнотація:
碩士<br>國立中央大學<br>環境工程研究所<br>106<br>The textile industry in Taiwan has been developed over 50 years, and it created high economic value for many years. Textiles plays an important role in apparel industry, because of the ability for moving towards high value-added products. Unfortunately, human appealing and wear glamorous clothes have ended up causing harm to the environment. The textile industry is one of the most pollutants releasing industries of the world. Most of primary and secondary treatment processes can deal with wastewaters. However, textile dyeing wastewater which containing versatile components, including many aerosols, high chroma, high BOD and COD, it lead difficult to remove textile dyeing wastewater only by use primary and secondary treatment. Therefore, it’s important to create a novel way to treat textile dyeing wastewater.
In this study we use Fenton-like reaction to create hydroxyl radicals which are among the strongest oxidizing agents and are able to decolourise a wide range of dyes. For Fenton-like reactions we selected Chungli laterite as the iron source, which has been recognized that Fe(OH)2+ can lead to the formation of hydroxyl radical (HO∙) and Fe(Ⅱ) through a ligand-to-metal charge transfer pathway. Our investigation reveals that dye in water not only decolourisation by Fenton-like reaction but also adsorption by laterite. Meanwhile, it was observed that dyes adsorped by laterite result in low Fenton-like reaction efficiency. Additional experiments were carried out using calcination laterite by 400 degrees Celsius and 700 degrees Celsius, where Fenton-like reactions were characterized with different pH, H2O2 dosage and reaction time. Results demonstrated that the 400 degrees Celsius calcination laterite was the most effective matrix for Fenton-like reaction. It’s also show that the most effective to dyes decolourise was crystal violet. We also pressed laterite as a cake for the re-use of Fenton-like reaction, and the effective to decolourise crystal violet is still more than 75% after four times reused. Our study may offer the possibility of the great potential applications of the calcination laterite in wastewater treatment areas especially for those containing compounds which are not easy to remove by traditional treatment processes.
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Liao, Cheng-Yu, and 廖正宇. "Formation of Nitrogen-Containing Compounds from Fenton- like Reaction of Acrylonitrile in Aqueous Solution." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/01844102035294596523.
Повний текст джерелаАнотація:
碩士<br>嘉南藥理科技大學<br>環境工程與科學系暨研究所<br>91<br>This research was to evaluate the treatment efficiency and formation of
nitrogen-containing compounds from Fenton-like reaction of acrylonitrile (AN)
in aqueous solution. HPLC, TC, IC and TKN were used for the evaluation.The
effects of pH value of solution, initial concentration of hydrogen peroxide
and ferric ions were examined. The efficiency of Fenton-like process was
measured by the decomposition of acrylonitrile, removal of dissolved organic
carbon (DOC). In addition, formation and variation of organic nitrogen,
ammonia nitrogen, nitrite and nitrate ions during the reaction were also
detected in this study.
In general, it is an effective method to remove acrylonitrile from the
aqueous solution using Fenton-like method. In this study, after 60 minutes
Fenton-like process treatment, the decomposition of acrylonitrile at the
condition of pH 2.5 was above 100%. On the other hand, acrylonitrile could not
be decomposed completely at pH 3. The result also showed that the removal
efficiencies of AN and DOC increased with increasing of hydrogen peroxide. The
same phenomenon was observed when the hydrogen peroxide concentration was
varied. The highest removal efficiency of 100% and 55% for AN and DOC,
respectively, was obtained in this study.
On the study of nitrogen mass balance, immediately after the Fenton-like
reagent addition, NO2－ rose rapidly up to a peak and followed by a slow
decline. The similar phenomenon of NH4+ was observed in this study. The
concentration of NO3－ increased with reaction time and then remained
approximately constant. Formation of NO2－ and NO3－ increased with increasing
of Fenton-like reagent dosage. Visible gas evolution from the reaction vessels
suggested gaseous byproducts. Nitrogen gas yields were calculated from the
nitrogen balance results. Nitrogen gas production accounted for about 90&#
12316;94% of nitrogen in AN. The ideal-gas law was used to calculate the
volume of nitrogen gas. The results showed that 40〜44mL of nitrogen gas
was produced during 1 hour Fenton-like reaction.
The kinetic of the decompositions of hydrogen peroxide and DOC followed the
pseudo-first order reaction, and the highest observed reaction constant value
of 0.070 min-1 and 0.096 min-1, respectively, was obtained in this study.
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Chang, Kuei-Chuan, and 張癸全. "The study of Fenton-like reaction catalyzed by a Fe(III)-organic acid B complex." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/88962310049789259381.
Повний текст джерелаАнотація:
碩士<br>國立屏東科技大學<br>環境工程與科學系所<br>96<br>The traditional Fenton oxidation method, when operated in the neutral pH range, will produce a large amount of sludge or sediments and clog aquifers. There are many new catalysts tested nowadays to replace the Fe(II) ions. These modified processes are one type of Fenton-like oxidation. The purpose of this study was to explore an organic acid B and Fe (III) complex as a new catalyst for Fenton-like reaction to (1) understand the effectiveness of Fe(III)-organic acid B complex in Fenton-like reaction, and to (2) develop a more friendly remediation technology for contaminated sites. This study used batch reaction systems to evaluate the catalytic efficiency of the Fe(III)-organic acid B complex.
The results revealed some (about 0.12 ~ 0.17 mg) of the added benzene (C0=0.4 mg) was adsorbed by the Fe(III)-organic acid B. The better degradation of benzene was found by increasing the concentration of organic acid B at 7-370 mg/L. The degradation of benzene increased to 50%. However, when the concentration of organic acid B in the solution was further increased to 478.3- 782.6 mg / L , it will inhibit the Fenton-like reaction. The best degradation efficiency for benzene removal occurred at Fe(III)-organic acid B complex weight ratio of 1:13.The oxidation of benzene at 0.8 mg by the Fenton-like reaction catalyzed by Fe(III)-organic acid B complex was about 0.46 mg. More benzene removal (up to 0.69 mg) was found at lower Fe (III)-organic acid B complex but the same initial benzene concentration and H2O2 dose. Also, at low concentrations of Fe(III)-organic acid B complex (w/w ratio=1:13 and organic acid B = 50 mg / L), the removal of benzene by 59 mM H2O2 was as high as 80 to 90 %, which was 40 to 60 percent better than that of 588 mM H2O2 . In addition, at 59 mM H202 and Fe(III)-organic acid B complex ratio= 1:13 and 1:35 (w / w) , the Fenton-like oxidation of benzene (0.8 mg) last four hours. The Fenton-like reaction catalyzed by iron minerals usually stops within 1 hr, and the data in this study showed a potential advantage in the field.
The kinetic result showed that the first order reaction rate constant k for Fenton-like reaction of benzene using the developed catalyst at Fe(III): organic acid B weight ratio=1:13 and benzene concentration = 0.1 mg was 0.3539 (1/min). At higher initial concentration of benzene (0.8 mg) , the k increased to 0.5026 (1/min). Thus, it appeared that the initial concentration of benzene affect the Fenton-like removal efficiency as well as the reaction constant.
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Hsu, Chi-Yu, and 許啟裕. "The Oxidation and Reaction Constants between Hydroxyl Radicals and Contaminant NAPLs During Fenton-like Oxidation." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/98901988122764904378.
Повний текст джерелаАнотація:
碩士<br>國立屏東科技大學<br>環境工程與科學系<br>93<br>NAPL-type contaminats are very diffcult to be removed from a contaminated groundwater site. The heterogeneity of aquifers usually results in NAPL droplets of different sizes trapped in aquifers. In this reserch, Fenton-like oxidations cataylzed by synthetic goethite for three DNAPLs of chlorinated ethylene and three LNAPLs of aromatic compounds were performed to evaluate the reaction constants (KHO.,P) between hydroxyl radicals and DNAPLs of chlorinated ethylene with with different droplet sizes. The oxdation efficiencies of different NAPL compounds were compared . The result showed that the soluble phase of contaminants was oxidized more effectively than the NAPLs, and so are the KHO.,P values for chlorinated ethylene and aromatics. The initial H2O2 dose didn’t affect either oxidation efficiency or the reaction constant. The droplet size of chlorinated DNAPLs didn’t significantly affect the oxidation efficiency. The KHO.,P for PCE DNAPLs seems to increase slightly with the total surface area of droplets, but the others were not so obvious. Because the aromatic group have more π-bonds than the chlorinated ethylenes, the aromatic compounds are better than the chlorinated ethylenes in the oxidation efficiency and the KHO.,P both for the soluble and NAPL phase. Although the oxidation efficiency of NAPLs was 10~20% less than that of the soluble form for all the six compounds, such a reduction would pose a more negative impact on the oxidation of cis 1,2-DCE and benzene due to their low reactivity to the hydroxyl radicals.
Книги з теми "Fenton-like reaction"
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Kakarla, Prasad K. C. Depth of Fenton-like reactions in soils for the oxidation of a sorbed hydrophobic contaminant. 1994.
Знайти повний текст джерелаЧастини книг з теми "Fenton-like reaction"
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Sriprom, Pongsert, Chitsan Lin, Arthit Neramittagapong, and Sutasinee Neramittagapong. "Investigation of Important Parameters for Lignin Degradation Using Fenton-Like Reaction via Cu Doped on Bagasses-MCM-41." In Springer Proceedings in Physics. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26324-3_9.
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Baragh, Fidâ, Khalid Draoui, Brahim El Bali, Abdelhak Kherbeche, and Mahfoud Agunaou. "Response Surface Methodology for the Optimization of 4-Nitrophenol Degradation by a Heterogeneous Fenton-Like Reaction on Moroccan Pillared Clays." In Advances in Intelligent Systems and Computing. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36671-1_50.
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Lee, Changha. "Use of High-Valent Metal Species Produced by the Fenton (-like) Reactions in Water Treatment." In Frontiers in Water-Energy-Nexus—Nature-Based Solutions, Advanced Technologies and Best Practices for Environmental Sustainability. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13068-8_21.
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Mohapatra, Titikshya, and Prabir Ghosh. "Degradation of Eosin Yellow Dye Solution by using Nanosized Copper Based Heterogenous Fenton-like Catalyst in a Fluidised Bed Reactor." In Environmental Degradation: Monitoring, Assessment and Treatment Technologies. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94148-2_10.
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Węgrzyn, Agnieszka. "Removal of Phenol from Wastewater Using Fenton-Like Reaction over Iron Oxide–Modified Silicates." In Physico-Chemical Wastewater Treatment and Resource Recovery. InTech, 2017. http://dx.doi.org/10.5772/65097.
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Li, T., G. Zhang, and P. Wang. "Removal of BPA through a goethite-photocatalyzed fenton-like reaction with the enhancement of oxalic acid." In Material Science and Environmental Engineering. CRC Press, 2015. http://dx.doi.org/10.1201/b19346-25.
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Chen, Hongdi, Changwei An, and Tong Liu. "Degradation of Rhodamine B by Fe Heteropoly Acid Hydrogen Peroxide Under Visible Light." In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230321.
Повний текст джерелаАнотація:
A light Fenton like system PW11O39Fe(III)(H2O)4- (PW11Fe/H2O) was constructed using Kegn type iron instead of heteropolyanion PW11Fe as the visible light active component, and was used for visible light catalytic degradation of model pollutant Rhodamine B (RhB). At the same time, the effects of H2O2 concentration, PW11Fe concentration, initial RhB concentration and pH value of solution on the visible light catalytic degradation rate of RhB were investigated, and the kinetic properties of RhB photocatalytic degradation were discussed. The experimental results showed that the system composed of 0.6mmol·L-1. PW11Fe and 4 mmol·L-1H2O2 had the best photocatalytic degradation effect on RhB when the pH of the solution was 4.5. RhB with 0.01mmol·L reacted for 60 minutes under 250W metal halide lamp irradiation, achieving a degradation rate of 100%. The reaction lasted for 240 minutes, and the total organic carbon (TOC) removal rate was about 48%. The hydroxyl radical quenching and electron paramagnetic resonance (EPR) experiments showed that the PW11Fe/H2O2 system produced hydroxyl radicals under visible light irradiation, which led to the rapid degradation of RhB. The apparent Reaction rate constant of the degradation reaction was 6.2 mmol·L-1·min-1.
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Du, Pham Dinh, and Pham Ngoc Hoai. "Effect of Some Synthetic Factors on the Metal-organic Framework Formation of MIL-53(Fe) and its Catalytic Activity in Fenton-like Reaction System." In Research Aspects in Chemical and Materials Sciences Vol. 5. B P International (a part of SCIENCEDOMAIN International), 2022. http://dx.doi.org/10.9734/bpi/racms/v5/9119f.
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Budiawan, Intan Cahaya Dani, Chrissy Fransisca Olivyana Rugian, and Sri Handayani. "In Vivo Study of DNA Adduct (8-OHdG) Formation of Rattus novergicus Using Bisphenol a through Fenton-Like Reaction and Nickel (II) as Cancer Risk Biomarker." In Bisphenols. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.99432.
Повний текст джерелаАнотація:
Bisphenol A (BPA) has been used in many consumer products including plastics, and food packaging. There is the evidence that Bisphenol A have potential to cause oxidative stress by disturbing the redox status in cells. We have conducted the in vivo study of BPA and Ni(II) exposure to Rattus novergicus and confirmed the formation of DNA adduct 8-OHdG as biomarker of oxidative stress and cancer risk. Subacute dose of BPA (2 mg/kg BW) and Ni (II) metals (0.1 μg/kg BW) have been exposed to animal test for 28 days. We collected the urine sample of animal samples every week. The formation of 8-OHdG found in urine of animal samples monitored by Liquid Chromatography–Mass Spectrometry (LC–MS/MS). The result of this study indicates that levels of 8-OHdG in animal samples exposed to BPA and BPA-Ni (II) increase every week. However, levels of 8-OHdG in animal samples exposed by BPA-Ni (II) is less than levels of 8-OHdG in animal samples exposed by BPA only. This can be happened because Ni (II) given to animal samples are not in the excessed levels, therefore the synergic effect of BPA and Ni (II) has not already been seen. The hydroxyl radical can cause oxidative DNA damage and interact with DNA guanine base by producing DNA adduct 8-hydroxy-2′-deoxyguanosine (8-OHdG). This book aimed to obtain information regarding in vivo study of BPA and metal ions exposure can generate hydroxyl radical as a dominant form of Reactive Oxygen Species (ROS) that can interact with macromolecules such as DNA and form DNA adduct as biomarker of oxidative stress and cancer risk.
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"Advanced Oxidation Processes for Wastewater Remediation: Fundamental Concepts to Recent Advances." In Materials Research Foundations. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901144-2.
Повний текст джерелаАнотація:
Industrialization and modernization in recent times have led to a water crisis across the world. Conventional methods of water treatment like physical, chemical and biological methods which comprise of many commonly used techniques like membrane separation, adsorption, chemical treatment etc. have been in use for many decades. However, problems like sludge disposal, high operating costs etc. have led to increased focus on Advanced Oxidation Processes (AOPs) as alternative treatment methods. AOPs basically involve reactions relying on the high oxidation potential of the hydroxyl (OH•) free radical. They have the potential to efficiently treat various toxic, organic pollutants and complete degradation of contaminants (mineralization) of emerging concern. Many different types of homogenous as well as heterogenous AOPs have been studied viz: UV/H2O2, Fenton, Photo-Fenton, Sonolysis, Photocatalysis etc. for treatment of a wide variety of organic pollutants. Different AOPs are suitable for different types of wastewater and hence proper selection of the right technique for a particular type of pollutant is required. The inherent advantages offered by AOPs like elimination of sludge disposal problems, operability under mild conditions, ability to harness sunlight, non selective nature (ability to degrade all organic and microbial contamination) etc. have made it one of the most actively researched areas in recent times for wastewater treatment. Despite the benefits and intense research, commercial applicability of AOPs as a practical technique for treating wastewater on a large scale is still far from satisfactory. Nevertheless, positive results in lab scale and pilot plant studies make them a promising water treatment technique for the future. In the present chapter, an attempt has been made to discuss all aspects of AOPs beginning with the fundamental concepts, classification, underlying mechanism, comparison, commercialization to the latest developments in AOPs.
Тези доповідей конференцій з теми "Fenton-like reaction"
1
CHENG, Peng, Marcello Brigante, Mohamed Sarakha, and Gilles Mailhot. "Kinetic analysis of the photo-Fenton/Fenton-like reaction by Ferrozine." In Goldschmidt2023. European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.20730.
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He, Liping, Chenghua Xu, Zhixiang Ye, Shengyu Liu, and Yingchun Yang. "2,4-Dichlorophenol Degradation by Heterogeneous Fenton Like Reaction Using carbon-Fe Catalysts." In 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5162135.
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Abdullah, N. H., N. A. Zubir, and H. Hassan. "Decolourization of methyl orange using iron- immobilize MKSF in UV assisted Fenton-like reaction." In 3RD ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2017 (EGM 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5002461.
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Hu, Sihai, Yaoguo Wu, Hairui Yao, Jianguo Wei, and Shuai Zhang. "Efficient Removal of Methylene Blue by Fenton-like Reaction using nZVI/GAC Composite as Catalyst." In 2nd International Conference on Green Materials and Environmental Engineering. Atlantis Press, 2015. http://dx.doi.org/10.2991/gmee-15.2015.10.
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Gvoić, Vesna, Miljana Prica, Đurđa Kerkez, et al. "Fenton-like oxidation of flexographic water-based key (black) dye: a definitive screening design optimization." In 10th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design,, 2020. http://dx.doi.org/10.24867/grid-2020-p25.
Повний текст джерелаАнотація:
Fenton oxidation process has obtained large applicative use for efficient water remediation, whereby overall reaction efficiency could be improved by developing advanced Fenton catalysts. In order to synthesize iron nanoparticles with higher catalytic activity, a simple and eco-friendly method using FeCl3 and aqueous plant extract (oak leaves) was applied in this paper. The nano zero valent iron particles were used as a catalyst in Fenton treatment to remove organic dye from aqueous solution. The objective of this study was to optimize Fenton-like process for the removal of black printing dye using a recently developed design of experiment method - definitive screening design. This novel design framework significantly reduces the number of experiments required to estimate the model parameters and to establish the optimum operation conditions. The experiments were carried out in a batch mode technique, investigating the influence of dye concentration (20 - 180 mgL-1), nanoparticles dosage (0.75 - 60 mgL-1), H2O2 concentration (1 - 11 mM) and pH value of the solution (2 - 10) on the decolorization efficiency. The Fenton-like process resulted with 79% of dye removal from aqueous solution under the optimal process conditions: dye concentration of 180 mgL-1, nanoparticles dosage of 0.75 mgL-1, H2O2 concentration of 1 mM and pH of 2. Increasing the pH value to slightly acidic or near neutral (5-7) medium resulted with slight decrease in the process efficiency (69.14 - 62.63%), but a limitation in the form of sludge generation is noticeable.
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Zhou, Dan, and Tao Zhang. "Notice of Retraction: Methylene Blue Degradation by Heterogeneous Fenton-Like Reaction Using Activated Carbon-Fe Catalysts." In 2011 5th International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2011. http://dx.doi.org/10.1109/icbbe.2011.5781099.
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Albqmi, Mha, Amani Belaiba, and Gassan Hodaifa. "VALORIZATION OF RED MUD AS A CATALYST IN THE TREATMENT OF OLIVE MILL WASTEWATER BY FENTON REACTION." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/4.2/s18.19.
Повний текст джерелаАнотація:
The worldwide olive oil sector is a strategic sector for olive oil producing countries due to olive oil nutrition and health benefits. With what is being produced of olive oil, it continues to produce wastewater with a significant environmental impact due to the high organic load and the biochemical composition of this wastewater, particularly, the presence of microbial growth inhibiting compounds such as phenolic compounds, which makes its biological treatment difficult. On other way, red mud, the main leaching residue resulting from the alkaline treatment of bauxite (Bayer process), can be used as catalyst in chemical processing. Bayer red mud reveals high alkalinity, strong water absorption, and a large content of iron. The presence of metals in the composition of the red mud, such as iron dioxide (hematite), titanium dioxide, etc. allows its use as a catalyst in advanced oxidation processes. In this work, red mud has been revalued as a catalyst in the treatment of olive mill wastewater (OMW) by Fenton reaction. All experiments were carried out at laboratory scale in reactor with capacity of 500 cm3. Experiments have been carried out at different concentrations of red mud 0.05, 0.10, 0.5, 1.0, 2.0, 4.0, 5.0, 20, and 30 g/L. In parallel, three control experiments were carried out using only hydrogen peroxide or hydrochloric acid or red mud without pH adjustment (adsorption experiment). Experimental results have determined that the introduction of red mud as a catalyst in the like Fenton reaction (H2O2/red mud) with concentrations higher than 0.05 g/L has allowed the increase of the degradation percentages until reaching stable values at red mud concentrations higher than 5 g/L. The removal percentages at 0.5 g/L of red mud were COD = 47.1 %, total organic carbon (TOC) = 58.1 %, total carbon (TC) = 66.8 %, total nitrogen = 44.1 %, and total phenolic compounds (TPCs) = 63.5 % versus 57.2 % for COD, 74.4 % for TOC, 79.9 % for TC, 70.7 % for TN, and 66.0 % for TPCs in Fenton like reaction with 5 g/L of red mud. The common operating conditions were initial COD of OMW = 6171.9 mg O2/L, initial TOC of OMW = 3253.7 mg/L, pH = 3, magnetic agitation speed = 460 rpm, environment temperature, and the H2O2 at 10 % (w/v) added to the OMW according to the stoichiometry of the reaction. Given these results, it can be concluded that red mud can be a promising catalyst in oxidation systems based on the Fenton reaction allowing the incorporation of wastes into new green processes leading to the achievement of circular economy in industrial processes.
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Gvoić, Vesna, Đurđa Kerkez, Aleksandra Kulić Mandić, et al. "Physico-chemical evaluation and kinetic study of coloured printing wastewater prior and post-fenton treatment." In 11th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design, 2022. http://dx.doi.org/10.24867/grid-2022-p87.
Повний текст джерелаАнотація:
The paper reports removal of organic Black (Key) dye from real printing wastewater using nano zero valent iron particles as a catalyst in Fenton-like treatment. The degradation efficiency of Black diazo dye via Fenton-like treatment is reported to be 61% under established optimal process conditions: [Fe2+] = 0.75 mgL-1, pH = 2, [H2O2] = 1 mM, within a reaction time of 75 min. The absorption spectra of Black dye clearly indicate that dye degradation is a slow process with difficult decomposition of aromatic structures, due to the cleavage of diazo bonds by hydroxyl radicals. The physico-chemical characterizations (measurements of pH, electrical conductivity, temperature, turbidity, chemical oxygen demand, biochemical oxygen demand, total organic carbon, anionic surface-active substances and phosphorus content) as well as toxicity study (Vibrio fischeri bacteria) revealed the complex nature of printing effluent. Increased conductivity and biochemical oxygen demand content after Fenton treatment imply the formation of various byproducts and intermediates, formed in a solution during dye degradation. The mineralization percentage of Black dye of 58% is followed with 47% of chemical oxygen demand reduction. Results of toxicity test on Vibrio fischeri bacteria indicate that both untreated and treated printing effluents belong to moderate toxic samples with 58% and 67% of toxicity inhibition, respectively. Among three evaluated kinetic models (the first-order, the second-order, and Behnajady– Modirshahla–Ghanbary), experimental results fitted very well to the Behnajady - Modirshahla - Ghanbary model, indicating high initial rate of Black dye degradation.
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Budiawan, B., S. Handayani, I. C. Dani, R. Bakri, S. Hannaa, and F. Irawati. "In vitro study of DNA adduct 8-hidroxy-2’-deoxyguanosine (8-OHdG) formation through Fenton-like reaction with butylated hydroxytoluene quinone (BHT quinone)." In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5064057.
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Budiawan, B., D. O. Putri, S. Handayani, I. C. Dani, and R. Bakri. "The study on in vitro formation of DNA adduct 8-hydroxy-2-deoxyduanosine (8-OHdG) from benzo[a]pyrene and Fenton-like reaction." In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5064107.
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