Artigos de revistas: "Fenton-like reaction"

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Dugandzic, Ana, Andjelka Tomasevic, Dunja Dabic, Natasa Sekuljica, Marina Radisic, Slobodan Petrovic e Dusan Mijin. "Degradation of nicosulfuron using fenton and fenton-like reactions". Chemical Industry and Chemical Engineering Quarterly 24, n.º 3 (2018): 201–8. http://dx.doi.org/10.2298/ciceq170617032d.

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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 e Mei Huang. "Treatment of Dye Wastewater by Nano-Ferrous Modified Bentonite Assisted Advanced Oxidation Processes". Advanced Materials Research 486 (março de 2012): 104–7. http://dx.doi.org/10.4028/www.scientific.net/amr.486.104.

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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, n.º 12 (1 de janeiro de 2007): 2325–38. http://dx.doi.org/10.1351/pac200779122325.

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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, e De Li Wu. "Heterogenous Fenton-Like Oxidation of Reactive Black 5 in Water Using Pyrite Cinder". Advanced Materials Research 726-731 (agosto de 2013): 1867–71. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1867.

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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 e 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, n.º 7 (julho de 2020): 191977. http://dx.doi.org/10.1098/rsos.191977.

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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 e Wei Tao Li. "Microwave-Enhanced Fenton-Like System, Fe₃O₄/H₂O₂ for Rhodamine B Wastewater Degradation". Applied Mechanics and Materials 448-453 (outubro de 2013): 834–37. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.834.

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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 e Lincoln Lucílio Romualdo. "Sulfamethoxazole and Trimethoprim Degradation by Fenton and Fenton-Like Processes". Water 12, n.º 6 (9 de junho de 2020): 1655. http://dx.doi.org/10.3390/w12061655.

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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, e Chueh-Ying Pai. "Application of cuprous oxide synthesized from copper-containing waste liquid to treat aqueous reactive dye". Water Science and Technology 65, n.º 9 (1 de maio de 2012): 1557–63. http://dx.doi.org/10.2166/wst.2012.047.

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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 e Jinglei Chen. "Degradation of Antibiotics by Fenton-like Reaction Catalyzed by Iron Oxide". Advances in Materials Science and Engineering 2022 (30 de julho de 2022): 1–11. http://dx.doi.org/10.1155/2022/6849818.

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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, Caifang Li, Liya Fu, Qiuhua Li e Xionghui Wei. "Carbon-Based Nanocomposites as Fenton-Like Catalysts in Wastewater Treatment Applications: A Review". Materials 14, n.º 10 (18 de maio de 2021): 2643. http://dx.doi.org/10.3390/ma14102643.

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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.

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Yu, Shu Rong, Ting Zhang e Hui Xia Feng. "Characterization and Catalytic Activity of Fenton-Like Catalyst: Fe₂O₃/Attapulgite". Key Engineering Materials 501 (janeiro de 2012): 128–33. http://dx.doi.org/10.4028/www.scientific.net/kem.501.128.

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Fe2O3/attapulgite(ATP) catalyst was successfully prepared for Fenton reaction to degrade an anion surfactant, sodium dodecyl benzene sulfonate(SDBS)，in an aqueous solution. BET, SEM, FT-IR were performed to characterize Fe2O3/ ATP catalyst. Comparative studies indicated that the SDBS degradation ratios were much higher in presence of Fe2O3/ATP and H2O2 than those in presence of Fe2O3/ATP or H2O2 only, which suggested that the Fe2O3/ATP-catalyzed Fenton-like reaction governed the SDBS removal process. It also can be seen that Fe2O3/ATP-catalyzed Fenton-like reaction almost has the same efficiency as homogeneous Fenton reaction, while the former can be reused and has no secondary pollutants.

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Carmichael, Alasdair J. "Vanadyl-induced Fenton-like reaction in RNA". FEBS Letters 261, n.º 1 (12 de fevereiro de 1990): 165–70. http://dx.doi.org/10.1016/0014-5793(90)80662-3.

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An, Weiqin, Qinghe Wu, Mengfei Hou, Penli Zhang e Chunfu Zhang. "Self-assembled metal-polyphenol nanomedicines for tumor chemotherapy/chemokinetic synergistic therapy". Journal of Physics: Conference Series 2671, n.º 1 (1 de janeiro de 2024): 012019. http://dx.doi.org/10.1088/1742-6596/2671/1/012019.

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Abstract Chemodynamic therapy (CDT) converts endogenous H2O2 into highly toxic reactive oxygen species through the Fenton reaction or Fenton-like reaction. With the “one-pot” approach, the nanodrug EGCG-Cu-cisplatin NPs were created. The nanodrug has a particle size of approximately 150 nm and a homogeneous spherical shape. In vitro, results showed that the nanodrug degraded in a weakly acidic environment and released Cu2+ and cisplatin. Cisplatin raises intracellular H2O2 through a cascade reaction, Cu2+ consumes GSH while generating Cu+. Cu+ catalyzes H2O2 to generate •OH, which breaks the intracellular redox balance, induces ferroptosis, reduces tumor resistance, and promotes chemotherapy. CDT uses the Fenton /Fenton-like reaction to transform endogenous H2O2 into extremely hazardous reactive oxygen species.

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Zhang, Ting, Yi Wang, Shu Rong Yu e Hui Xia Feng. "Comparative Studies of Two Fenton-Like Catalysts: Fe₂O₃ and Fe₂O₃/Attapulgite". Advanced Materials Research 518-523 (maio de 2012): 696–700. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.696.

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Fe2O3 and Fe2O3/attapulgite(ATP) catalyst was used for Fenton reaction to degrade an anion surfactant, sodium dodecyl benzene sulfonate(SDBS)，in an aqueous solution. Comparative studies indicated that Fe2O3/ATP-catalyzed Fenton system and Fe2O3-catalyzed Fenton system have the same catalysis capability. These two systems all have a widely pH range (2-10), and the catalysts can be reused and have no secondary pollutants. It also can be seen that Fe2O3/ATP-catalyzed Fenton-like reaction has much efficiency than Fe2O3-catalyzed Fenton reaction.

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Yan, Peng, e Dong Bai. "Rapid Mineralization of Rhodamine B Wastewater by Microwave Synergistic Fenton-Like Oxidation Process". Advanced Materials Research 807-809 (setembro de 2013): 1384–87. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.1384.

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The coulpling method of microwave irradiation and Fenton-like reaction with magnetic nanomaterials of CuFe2O4 as the catalyst was used for degradation of Rhodamine B wastewater. Factors affecting the degradation rate of Rhodamine B such as H2O2 dosage, CuFe2O4 dosage, Rhodamine B initial concentration, reaction temperature and so on were investigated systematically. The experimental results showed that the microwave-assisted Fenton-like process using H2O2/CuFe2O4 was the most effective treatment process compared with other methods. Unlike the conventional Fenton reactions, which are catalyzed by homogeneous catalysts/promoters, the nanopowder CuFe2O4 catalyst is easily collected by an external magnetic field and remains efficient in reuse. The results showed that under the given conditions (80°C, pH = 4, Rhodamine B initial concentration = 100mg/L, CuFe2O4 dose = 0.375g/L, H2O2 dose = 2.5mL/L, Reaction time = 2min), the removal rate of Rhodamine B could reach nearly 100%. Moreover, the COD determination results showed that under above conditions, the COD value could reach zero.

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Yu, Guangfei, Lai Lyu, Fagen Zhang, Dengbiao Yan, Wenrui Cao e Chun Hu. "Theoretical and experimental evidence for rGO-4-PP Nc as a metal-free Fenton-like catalyst by tuning the electron distribution". RSC Advances 8, n.º 6 (2018): 3312–20. http://dx.doi.org/10.1039/c7ra12573a.

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Wei, Qian, Beibei Lu, Qing Yang, Can Shi, Yulan Wei, Minmin Xu, Chenjie Zhang e Yaxian Yuan. "MoS2/Au Heterojunction Catalyst for SERS Monitoring of a Fenton-like Reaction". Materials 16, n.º 3 (30 de janeiro de 2023): 1169. http://dx.doi.org/10.3390/ma16031169.

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Fenton technology is one of advanced oxidation process (AOP) methods to treat wastewater through chemical oxidation. Due to the limitations of classical iron-based catalysts, it is still challenging to find suitable catalysts for Fenton-like reactions. Here, MoS2/Au heterojunctions were successfully synthesized by reduction of chloroauric acid in the solution of layered MoS2 prepared by hydrothermal method. As a model molecule, methylene blue (MB) was used as the species to be degraded to evaluate the performance of the catalyst. It was determined by UV–visible spectra that the optimal catalyst can be obtained when MoS2 (mg): HAuCl4 (wt. % mL) is 2:2. The Fenton-like reaction process was monitored by introducing highly sensitive surface enhanced Raman spectroscopy (SERS). The results show that MB can be degraded by 83% in the first 10 min of the reaction, indicating that MoS2/Au has good catalytic performance. In addition, as a fingerprint spectrum, SERS was used to preliminarily analyze the molecular structure changes during the degradation process. The result showed that C-N-C bond was easier to break than the C-S-C bond. NH2 group and the fused ring were destroyed at the comparable speed at the first 30 min. In terms of application applicability, it was showed that MB degradation had exceeded 95% at all the three pH values of 1.4, 5.0, and 11.1 after the reaction was carried out for 20 min. The test and analysis of the light environment showed that the catalytic efficiency was significantly improved in the natural light of the laboratory compared to dark conditions. The possible mechanism based on ·OH and ·O2− from ESR data was proposed. In addition, it was demonstrated to be a first-order reaction from the perspective of kinetics. This study made a positive contribution to broaden of the applicable conditions and scope of Fenton-like reaction catalysts. It is expected to be used as a non-iron catalyst in practical industrial applications. From the perspective of detection method, we expect to develop SERS as a powerful tool for the in situ monitoring of Fenton-like reactions, and to further deepen our understanding of the mechanism.

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Khosravifarsani, Meysam, Ali Shabestani-Monfared, Mahdi Pouramir e Ebrahim Zabihi. "Hydroxyl Radical (ºOH) Scavenger Power of Tris (hydroxymethyl) Compared to Phosphate Buffer". Journal of Molecular Biology Research 6, n.º 1 (18 de setembro de 2016): 52. http://dx.doi.org/10.5539/jmbr.v6n1p52.

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Tris and phosphate buffer are regularly used in experimental investigations. These buffers might have radical scavenger properties toward different kinds of Reactive Oxygen Species (ROS) produced in solutions during chemical reactions like Fenton reaction and gamma radiolysis. Hydroxyl radicals (ºOH) are the most reactive and oxidizing agents having a great potential in oxidization of macromolecules like DNA and proteins. This in vitro study was aimed to evaluate radio-protective effects of Tris and phosphate buffer toward hydroxyl radicals generated by Fenton reaction. Hence, ºOH radicals were produced using a mixture of Hydrogen Peroxideand Ferrous Sulfate, called Fenton system. Human serum albumin (500µM) was prepared in Tris (10mM) and phosphate buffer (10mM), separately. These two samples were incubated with Fenton reaction (Ferrous Sulfate + Hydrogen peroxide) (10 mM) for 30 minutes and carbonyl groups were quantified by spectrophotometric carbonylation assay. The results of this study revealed the values of 1.04 ± 0.02 and 1.73 ± 0.03 for Tris and phosphate buffer treated samples, respectively. In conclusion, these findings confirmed that Tris buffer is a stronger radical scavenger toward ºOH radicals than phosphate buffer.

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Žabka, Dušan, Barbora Konečná, Peter Celec, Monika Janíková, Nadja Ivašková, Ľubomíra Tóthová, Michal Tamáš et al. "Ferrate (VI), Fenton Reaction and Its Modification: An Effective Method of Removing SARS-CoV-2 RNA from Hospital Wastewater". Pathogens 11, n.º 4 (9 de abril de 2022): 450. http://dx.doi.org/10.3390/pathogens11040450.

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The outbreak of the coronavirus disease 2019 (COVID-19) raises questions about the effective inactivation of its causative agent, Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) in medical wastewater by disinfectants. For this reason, our study of wastewater from a selected hospital evaluated several different advanced oxidation methods (Fenton reaction and Fenton-like reaction and ferrate (VI)) capable of effectively removing SARS-CoV-2 RNA. The obtained results of all investigated oxidation processes, such as ferrates, Fenton reaction and its modifications achieved above 90% efficiency in degradation of SARS-CoV-2 RNA in model water. The efficiency of degradation of real SARS-CoV-2 from hospital wastewater declines in following order ferrate (VI) > Fenton reaction > Fenton-like reaction. Similarly, the decrease of chemical oxygen demand compared to effluent was observed. Therefore, all of these methods can be used as a replacement of chlorination at the wastewater effluent, which appeared to be insufficient in SARS-CoV-2 removal (60%), whereas using of ferrates showed efficiency of up to 99%.

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Sriprom, Pongsert, Arthit Neramittagapong e Sutasinee Neramittagapong. "Synthesized BG-MCM-41 as Support Catalyst for Fenton-Like Reaction of Lignin Degradation". Advanced Materials Research 931-932 (maio de 2014): 12–16. http://dx.doi.org/10.4028/www.scientific.net/amr.931-932.12.

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Lignin was degraded by Fenton-like reaction using Cu-BG-MCM41, in which BG-MCM41 was synthesized by hydrothermal technique from Bagasse ash (BG) as a support. Cu was immobilized on BG-MCM41 by in situ hydrothermal and impregnation method and characterized by XRD and BET surface area. The Fenton-like reactions were carried out in a batch reactor using 5wt%CuO/SiO2, 10wt%CuO/SiO2, 5wt%Cu-BG-MCM41 and 10wt%Cu-BG-MCM41 at the pH of 3 and the temperature of 80°C. The Cu loading, pH, and temperature affected lignin degradation. The efficiency of lignin degradation obtained were 95% for 5wt%CuO/SiO2, 95% for 10wt%CuO/SiO2, 65% for 5wt%Cu-BG-MCM41 and 96% for 10wt%Cu-BG-MCM41 at the pH of 3 and 80°C for 30 min. The results show that pH and temperature affected the stability of Cu loading, in which it was leached into the aqueous solution and that the reaction will occur in the aqueous solution more than on the surface of catalyst. Thus, 5wt%Cu-BG-MCM41 has the highest stability for Fenton-like reactions.

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Jiang, Bin Hui, Yan Zhao, Yi Jin, Xiao Min Hu, Li Jiang e Xiao Ming Li. "Study on Coupled Oxidation and Microwave Process in Treating Urban Landfill Leachate by Fenton and Fenton-Like Reaction". Advanced Materials Research 393-395 (novembro de 2011): 1443–46. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.1443.

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In study, Microwave Irradiation enhanced Fenton-Like Process was introduced as a novel technology in the treatment of Landfill Leachate containing refractory organic matters. The sample leachate with initial COD loading of 11434 ~12067 mg•L−1 was collected from the Laohuchong (Shenyang, China) City Landfill. Fenton (FeSO4/H2O2) and Fenton-like (iron tailings/H2O2) reagents coupling with Microwave Irradiation were both studied. The Microwave Irradiation enhanced Fenton-Like Process was conducted under the optimal conditions as follows: 480W of microwave power, 3 min of radiation time, 3.0 of initial pH, 100mL•L−1 of H2O2 and 2g•L−1 of iron tailings. The removal rates of leachate samples with initial COD =11928 mg•L−1 using 1.5g.L-1 FeSO4 and 2.0g.L-1 iron tailings are 45.1% and 42.3% respectively on the condition of 320W MW radiated for 3 min at room temperature. The highest removal rate of the MW Fenton-Like Process is about 46% under the optimum conditions. It demonstrates the Fenton-Like reagent can be used as a substitution of Fenton reagent in Landfill Leachate applications which has extensive application prospect and extraordinary significance in aspects of resource utilization of waste materials and cost saving.

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Bai, Dong, e Peng Yan. "Magnetic Nanoscaled Fe₃O₄ as an Efficient and Reusable Heterogeneous Catalyst for Degradation of Methyl Orange in Microwave-Enhanced Fenton-Like System". Applied Mechanics and Materials 448-453 (outubro de 2013): 830–33. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.830.

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In this study, the Fe3O4magnetic nanoparticles (MNPs) were synthesized as heterogeneous catalysts to effectively degrade methyl orange. The coulping method of microwave irradiation and Fenton-like reaction was used for degradation of methyl orange waste water. The effects of Fe3O4dosage, initial H2O2concentration, catalyst cycles, reaction temperature and so on were assessed systematically. The experimental results showed that the microwave-assisted Fenton-like process using H2O2/Fe3O4was the most effective treatment process compared with other traditional methods. According to degradation of methyl orange, it has been found that the oxidation by Fenton-likes reagent is dependent on Fe3O4dosage, H2O2dosage, reaction temperature. The results indicate that under the optimal conditions, the removal rate of methyl orange could reach nearly 100%. Moreover, six cyclic tests for methyl orange degradation showed that the magnetic catalyst was very stable, recoverable, highly active, and easy to separate using an external magnet. Hence, the coulping method of microwave irradiation and Fenton-like reaction with magnetic nanomaterials of Fe3O4as the catalyst has potential use in organic pollutant removal.

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Zhang, Zhi Yong, e De Li Wu. "Advanced Treatment of Coking Wastewater by Oxidation Process Using Pyrite and Hydrogen Peroxide". Advanced Materials Research 726-731 (agosto de 2013): 2521–25. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2521.

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Coking wastewater is a kind of recalcitrant wastewater including complicate compositions. Advanced treatment of coking wastewater by Fenton-Like reaction using pyrite as catalyst was investigated in this paper. The results show that the chemical oxygen demand (COD) of coking wastewater decreased significantly by method of coagulation combined with two-stage oxidation reaction. COD of wastewater can decrease from 250mg/l to 45mg/l after treatment, when 2g/L pyrite was used in each stage oxidation and the dosage of hydrogen peroxide (H2O2) is 0.2ml/l for first stage treatment, 0.1ml/l for second stage treatment respectively. The pyrite is effective to promote Fenton-Like reaction with low cost due to high utilization efficiency of H2O2, moreover, catalyst could be easily recovered and reused. The Fenton-Like reaction might be used as a potential alternative to advanced treatment of recalcitrant wastewater.

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Chen, Lu, Haowen Cui, Feng Jiang, Lingyan Kong, Baoli Fei e Xiang Mei. "Efficient Removal of Methylene Blue Using an Organic–Inorganic Hybrid Polyoxometalate as a Dual-Action Catalyst for Oxidation and Reduction". Catalysts 14, n.º 9 (29 de agosto de 2024): 576. http://dx.doi.org/10.3390/catal14090576.

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An organic–inorganic hybrid polyoxometalate (POM) CoPMoV [PMoVI8VIV4VV2O42][Co(Phen)2(H2O)]2[TEA]2•H3O•3H2O (Phen = 1,10-phenanthroline, TEA = triethylamine) prepared by hydrothermal synthesis was explored as a heterogeneous catalysts to remove methylene blue (MB) through Fenton-like reaction and catalytic reduction. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) were employed to characterize CoPMoV. The MB removal rates for the Fenton-like reaction and the catalytic reduction were 91.6% (120 min) and 97.5% (2 min), respectively, under optimum conditions. CoPMoV demonstrated excellent stability and recyclability in the Fenton-like reaction and catalytic reduction, which was confirmed by 5 cycle tests. Plausible mechanisms for MB degradation and reduction have also been proposed. Benefiting from the excellent redox properties of cobalt and [PMoVI8VIV4VV2O42]5− anion, CoPMoV could act as a Fenton-like and reductive catalyst for the removal of MB. This study provides a green and facile strategy to design POM-based organic–inorganic material for dye wastewater treatment via oxidation and reduction.

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Zhu, Gang Chao, Jian Xin Shou, Jia Wei Qian, Hua Zheng Xin e Mu Qing Qiu. "Degradation of Methylene Blue by Fenton-Like Reaction". Advanced Materials Research 1065-1069 (dezembro de 2014): 3127–30. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.3127.

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In order to enhance the catalytic activity of the heterogeneous Fenton-like reaction, the catalyst of Fe3O4 composites was synthesized. The Fe3O4 was used as catalyst of the heterogeneous Fenton-like reaction to degrade methylene blue in aqueous solution. The influencing factors, such as pH, initial H2O2 concentration, dye concentration and catalyst concentration, were investigated. The results showed that the dye was effectively degraded at pH 3-8. The optimal condition was at pH3.5. The degradation efficiency of dye increased with the increase of the initial H2O2 concentration and reached maximum when the H2O2 concentration was 15 mmol/L. The degradation efficiency of dye increased with the catalyst concentration was 650 mg/L. The coexisted anions decreased the degradation efficiency of dye.

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Wang, Liping, Gonghao Liu, Mingyu Zhang, Kun Luo e Ya Pang. "Reduced Graphene Oxide-Coated CuFeO2 with Fenton-like Catalytic Degradation Performance for Terramycin". Nanomaterials 12, n.º 24 (9 de dezembro de 2022): 4391. http://dx.doi.org/10.3390/nano12244391.

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A novel Fenton-like catalyst made of reduced graphene oxide-coated CuFeO2 (rGO-coated CuFeO2) was synthesized by the hydrothermal reaction method to remove terramycin from aqueous solutions. The catalytic degradation performance of rGO-coated CuFeO2 for terramycin was verified with H2O2 activation. The characterization reveals that rGO-coated CuFeO2 has a micro- and mesoporous structure, with groups such as C=C/C−C, CH2−CO, and HO−C=O found on the surface. The Fenton-like catalytic degradation of terramycin by rGO-coated CuFeO2 was in line with the pseudo-second-order kinetic model, and the elevated temperature accelerated the reaction. Terramycin was catalytically degraded by rGO-coated CuFeO2 in two steps: terramycin was first adsorbed by rGO, and then Fenton-like degradation took place on its surface. This research presents new insight into the design and fabrication of Fenton-like catalysts with enhanced performance.

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Wei, Yuan, Yating Sun, Dahua Li, Binda Lu, Miaohua Liu, Gonggang Liu e Jinbo Hu. "Considerable Improvement in Fenton-like Degradation of MB Owing to Ti3+/Ti4+ Using Ion-doped Halloysite Nanotube Catalyst". Revista de Chimie 72, n.º 1 (3 de fevereiro de 2021): 66–78. http://dx.doi.org/10.37358/rc.21.1.8404.

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Due to high efficiency and environmental friendship, Fenton-like technology is widely used in water treatment and has always received significant attentions, especially in design of novel and efficient Fenton-like catalysts. In this paper, iron/titanium ions doped halloysite nanotubes (HNTs-Fe-Ti) have been developed as Fenton-like catalyst. Here, halloysite nanotubes (HNTs) with high specific surface area and excellent ion exchange capacity were used as carriers, and iron/titanium ions were trace-doped into HNTs via simple ion-exchange reaction. The degradation of the designed catalyst for methylene blue (MB) was greatly accelerated in the presence of titanium ion. It demonstrates that the excellent degradation ability mainly owes to the valence state transformation of titanium and the good adsorption ability of halloysite nanotubes. It shows the mechanism of titanium with multivalent states (Ti3+/Ti4+) on the degradation of MB is similar to the Fenton catalytic mechanism of iron ion trans-formation (Fe2+/Fe3+). In the Fenton-like degradation reaction, titanium and iron play a synergistic catalytic role in MB degradation while titanium has greater impact. When the ratio of titanium to iron is 5:1, the catalyst exhibits superior Fenton-like degradation performance, and the degradation rate could reach 91% at 100 min.

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Kanafin, Yerkanat N., Ardak Makhatova, Vasilios Zarikas, Elizabeth Arkhangelsky e Stavros G. Poulopoulos. "Photo-Fenton-Like Treatment of Municipal Wastewater". Catalysts 11, n.º 10 (8 de outubro de 2021): 1206. http://dx.doi.org/10.3390/catal11101206.

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In this work, the photochemical treatment of a real municipal wastewater using a persulfate-driven photo-Fenton-like process was studied. The wastewater treatment efficiency was evaluated in terms of total carbon (TC), total organic carbon (TOC) and total nitrogen (TN) removal. Response surface methodology (RSM) in conjunction Box-Behnken design (BBD) and multilayer artificial neural network (ANN) have been utilized for the optimization of the treatment process. The effects of four independent factors such as reaction time, pH, K2S2O8 concentration and K2S2O8/Fe2+ molar ratio on the TC, TOC and TN removal have been investigated. The process significant factors have been determined implementing Analysis of Variance (ANOVA). Both RSM and ANN accurately found the optimum conditions for the maximum removal of TOC (100% and 98.7%, theoretically), which resulted in complete mineralization of TOC at the reaction time of 106.06 min, pH of 7.7, persulfate concentration of 30 mM and K2S2O8/Fe2+ molar ratio of 7.5 for RSM and at the reaction time of 104.93 min, pH of 7.7, persulfate concentration of 30 mM and K2S2O8/Fe2+ molar ratio of 9.57 for ANN. On the contrary, the attempts to find the optimal conditions for the maximum TC and TN removal using statistical, and neural network models were not successful.

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Liu, Ziguo, Wei Zhou, Xianli Liu, Xuefen Yang, Wei Yang e Han Zheng. "Study on Treatment Performance of Desulfurization Wastewater by Zero-Valent Iron Fenton-like Process". Separations 10, n.º 8 (14 de agosto de 2023): 451. http://dx.doi.org/10.3390/separations10080451.

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In this study, the zero-valent iron Fenton reagent (ZVI Fenton-like) system was combined with the chemical precipitation method for the deep treatment of desulfurization wastewater from coal-fired power plants, and the chemical oxygen demand (COD) was used as the evaluation criterion for organic matter in the desulfurization wastewater. The effects of reaction time, H2O2 dosage, zero-valent iron dosage, pH, and reaction temperature were also investigated. The results showed that the COD concentration of the effluent was the lowest when the running time of the ZVI Fenton-like reagent system was 1 h, the dosage of H2O2 was 33.3 mg·L−1, the dosage of iron was 0.075 g·L−1, the pH was 4.5~6.5, the reaction temperature was 35 °C, the COD concentration of the wastewater was the lowest and its operating conditions were the best, and the internal reaction mechanism was finally deduced. In summary, the zero-valent iron Fenton reagent system provides a new idea for the treatment of desulfurization wastewater from coal-fired power plants.

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Bautista, P., J. A. Casas, J. A. Zazo, J. J. Rodriguez e A. F. Mohedano. "Comparison of Fenton and Fenton-like oxidation for the treatment of cosmetic wastewater". Water Science and Technology 70, n.º 3 (28 de maio de 2014): 472–78. http://dx.doi.org/10.2166/wst.2014.246.

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The treatment of cosmetic wastewaters by Fenton (Fe2+/H2O2) and Fenton-like (Fe3+/H2O2) oxidation has been studied. From batch and continuous experiments it has been proved that both versions of the Fenton process lead to quite similar results in terms of chemical oxygen demand (COD) and total organic carbon reduction although the COD shows a slightly higher rate in the early stages of reaction. COD reductions of around 55% after 2 h reaction time and 75–80% with 4 h residence time were reached in batch and continuous experiments, respectively, conducted at pH around 3, ambient temperature (20 °C), with 200 mg/L of Fe dose and an initial H2O2/COD weight ratio corresponding to the theoretical stoichiometric value. Achieving the locally allowable limit of COD for industrial wastewater discharge into the municipal sewer system takes no more than 30 min reaction time under those conditions by both Fenton systems. However, the Fenton-like process, where iron is fed as Fe3+, would be preferable for industrial applications since the ferric sludge resulting upon final neutralization of the effluent can be recycled to the process. A second-order kinetic equation with respect to COD fitted fairly well the experimental results at different temperatures, thus providing a simple practical tool for design purposes.

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Hamza, Amany, Soliman El-Mogazy e Aly Derbalah. "Fenton reagent and titanium dioxide nanoparticles as antifungal agents to control leaf spot of sugar beet under field conditions". Journal of Plant Protection Research 56, n.º 3 (1 de julho de 2016): 270–78. http://dx.doi.org/10.1515/jppr-2016-0040.

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AbstractIn this study, foliar sprays of Fenton solutions (Fenton reaction, Fenton-like reaction and Fenton complex), titanium dioxide (TiO2) and the recommended fungicide (chlorothalonil) were estimated in the control of sugar beet leaf spot caused byCercospora beticolaunder field conditions in two growing seasons. In addition, the impacts of these treatments on some crop characters (leaf dry weight, root fresh weight, soluble solid content, sucrose content and purity of sugar) were examined. Biochemical and histological changes in the livers and kidneys of treated rats compared to an untreated control were utilized to assess the toxicity of the examined curative agents. Overall, chlorothalonil and Fenton complex were the most effective treatments for disease suppression in both tested seasons followed by Fenton-like reagent, Fenton’s reagent and TiO2, respectively. Growth and yield characters of treated sugar beet significantly increased in comparison to an untreated control. There were mild or no (biochemical and histological) changes in the livers and kidneys of treated rats compared to the control. Fenton solutions and TiO2may offer a new alternative for leaf spot control in sugar beet.

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Hu, Sihai, Yaoguo Wu, Hairui Yao, Cong Lu e Chengjun Zhang. "Enhanced Fenton-like removal of nitrobenzene via internal microelectrolysis in nano zerovalent iron/activated carbon composite". Water Science and Technology 73, n.º 1 (15 de setembro de 2015): 153–60. http://dx.doi.org/10.2166/wst.2015.467.

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The efficiency of Fenton-like catalysis using nano zerovalent iron (nZVI) is limited by nZVI aggregation and activity loss due to inactive ferric oxide forming on the nZVI surface, which hinders electron transfer. A novel iron–carbon composite catalyst consisting of nZVI and granular activated carbon (GAC), which can undergo internal iron–carbon microelectrolysis spontaneously, was successfully fabricated by the adsorption–reduction method. The catalyst efficiency was evaluated in nitrobenzene (NB) removal via the Fenton-like process (H2O2-nZVI/GAC). The results showed that nZVI/GAC composite was good for dispersing nZVI on the surface of GAC, which permitted much better removal efficiency (93.0%) than nZVI (31.0%) or GAC (20.0%) alone. Moreover, iron leaching decreased from 1.28 to 0.58 mg/L after reaction of 240 min and the oxidation kinetic of the Fenton-like reaction can be described well by the second-order reaction kinetic model (R2 = 0.988). The composite catalyst showed sustainable catalytic ability and GAC performed as a medium for electron transfer in internal iron–carbon microelectrolysis to promote Fe2+ regeneration and Fe3+/Fe2+ cycles. Therefore, this study represents an important method to design a low cost and high efficiency Fenton-like catalyst in practical application.

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Han, Huijie, Jiachen Li e Hélder A. Santos. "Recent advances in Fenton and Fenton-like reaction mediated nanoparticle in cancer therapy". Biomedical Technology 3 (setembro de 2023): 40–51. http://dx.doi.org/10.1016/j.bmt.2022.12.004.

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Duan, Haohang, e Liang Wang. "Enhanced Catalytic Degradation of Ciprofloxacin by Iron-doped Hydroxyapatite". International Journal of Biology and Life Sciences 4, n.º 2 (1 de dezembro de 2023): 14–20. http://dx.doi.org/10.54097/ijbls.v4i2.03.

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In order to solve the problems in the iron-based Fenton-like catalytic oxidation system, a green, safe, efficient and stable Fe-hydroxyapatite (HAP) catalyst was developed and prepared for the Fenton-like catalytic oxidation reaction system in this study. We constructed the Fe-HAP /hydrogen peroxide system, systematically evaluated the synergistic effect between the Fe-HAP catalyst and hydrogen peroxide, and investigated the effect of the Fenton-like catalytic oxidation system on the removal of Ciprofloxacin(CIP), a hard-to-degrade antibiotic organic pollutant. We investigated the effect of this Fenton catalytic oxidation system on the removal of CIP, a difficult-to-degrade antibiotic organic pollutant, and revealed the mechanism of the reaction system and the main mechanism of the degradation of CIP. We also applied this catalyst material to the actual water body and explored the value of the application of this system, which provided scientific basis and reference value for the subsequent development of more efficient, stable, green and safe catalyst materials.

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Baldha, Mallesham, e Dr K. Srilatha. "Fenton Process for Removing Organic Pollutants from industrial Wastewater". International Journal of Engineering Research and Applications 14, n.º 10 (outubro de 2024): 73–78. http://dx.doi.org/10.9790/9622-14107378.

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The fenton process is one of the most studied advanced oxidation processes, due to its efficiency, low reaction time and easy application. In the present study, fenton process is used to remove the organic pollutants from industrial wastewater. The process parameters like pH and reaction time were studied using 1:10 ratio of FeSO4 and H2O2 with a 500ml working volume of sample. The most favourable circumstances were determined at a pH level of 7 with a reaction duration of 3 Hours. Finally, chemical oxygen demands (COD) and chlorides, before and after fenton process were measured to ensure the entire destruction of organics during their removal from industrial wastewater. The experimental results shown that the fenton process effectively achieved removal efficiency of 80%.

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Baldha, Mallesham, e Dr K. Srilatha. "Fenton Process for Removing Organic Pollutants from Industrial Wastewater". International Journal of Engineering Research and Applications 14, n.º 10 (outubro de 2024): 100–105. http://dx.doi.org/10.9790/9622-1410100105.

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The fenton process is one of the most studied advanced oxidation processes, due to its efficiency, low reaction time and easy application. In the present study, fenton process is used to remove the organic pollutants from industrial wastewater. The process parameters like pH and reaction time were studied using 1:10 ratio of FeSO4 and H2O2 with a 500ml working volume of sample. The most favourable circumstances were determined at a pH level of 7 with a reaction duration of 3 Hours. Finally, chemical oxygen demands (COD) and chlorides, before and after fenton process were measured to ensure the entire destruction of organics during their removal from industrial wastewater. The experimental results shown that the fenton process effectively achieved removal efficiency of 80%

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Zhang, Ke, e Yuntao Yan. "Exothermic Reaction in the Cleaning of Wastewater by a Fe2O3/Coconut Shell Activated Carbon/H2O2 Heterogeneous Fenton-like System". Sustainability 16, n.º 4 (9 de fevereiro de 2024): 1482. http://dx.doi.org/10.3390/su16041482.

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Energy utilization in wastewater degradation has important implications for sustainability; however, efficient multiphase Fenton-like catalysts are still needed. In this study, a heterogeneous Fe2O3/coconut shell activated carbon (CSAC) Fenton-like catalyst was prepared and evaluated with respect to degradation performance and exothermic reaction for the treatment of organic wastewater. Fe2O3@CSAC retained the porous morphology of CSAS, and Fe2O3 was uniformly loaded on the surface of CSAS. In the reaction system, the degradation rate of wastewater was higher and a large amount of heat was released; therefore, it could be applied to the energy recovery from wastewater source heat pump technology. The degradation rate of 300 mL of o-phenylenediamine solution with a concentration of 0.04 mol·L−1 was 89.0% under 0.25 mol·L−1 H2O2, 532 g·L−1 Fe2O3@CSAC, pH 7.1, and an initial reaction temperature of 30 °C, elevated to 7.9 °C. These findings clearly demonstrate the degradation performance and exothermic laws of the Fe2O3@CSAC/H2O2 multiphase Fenton-like system.

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Wu, C. H., J. T. Wu e Y. H. Lin. "Mineralization of sulfamethizole in photo-Fenton and photo-Fenton-like systems". Water Science and Technology 73, n.º 4 (27 de outubro de 2015): 746–50. http://dx.doi.org/10.2166/wst.2015.554.

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In this investigation, UV/H2O2, UV/H2O2/Fe2+ (photo-Fenton) and UV/H2O2/Fe3+ (photo-Fenton-like) systems were used to mineralize sulfamethizole (SFZ). The optimal doses of H2O2 (1–20 mM) in UV/H2O2 and iron (0.1–1 mM) in photo-Fenton and photo-Fenton-like systems were determined. Direct photolysis by UV irradiation and direct oxidation by added H2O2, Fe2+ and Fe3+ did not mineralize SFZ. The optimal dose of H2O2 was 10 mM in UV/H2O2 and that of iron (Fe2+ or Fe3+) was 0.2 mM in both UV/H2O2/Fe2+ and UV/H2O2/Fe3+ systems. Under the best experimental conditions and after 60 min of reaction, the SFZ mineralization percentages in UV/H2O2, UV/H2O2/Fe2+ and UV/H2O2/Fe3+ systems were 16, 90 and 88%, respectively. The UV/H2O2/Fe2+ and UV/H2O2/Fe3+ systems effectively mineralized SFZ.

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Geng, Xin, Wentao Li, Feng Xiao, Dongsheng Wang e Lian Yang. "Effect of in situ Fe(ii)/Fe(iii)-doping on the visible light-Fenton-like catalytic activity of Bi/BiOBr hierarchical microspheres". Catalysis Science & Technology 7, n.º 3 (2017): 658–67. http://dx.doi.org/10.1039/c6cy02195f.

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Kim, Dong-Seog, e Young-Seek Park. "Decolorization of Rhodamine B by Electro Fenton-like Reaction". Journal of Environmental Science International 17, n.º 1 (31 de janeiro de 2008): 37–44. http://dx.doi.org/10.5322/jes.2008.17.1.037.

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Gosselin, F., L. M. Madeira, T. Juhna e J. C. Block. "Drinking water and biofilm disinfection by Fenton-like reaction". Water Research 47, n.º 15 (outubro de 2013): 5631–38. http://dx.doi.org/10.1016/j.watres.2013.06.036.

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Murphy, Andrew P., Wilbur J. Boegli, M. Kevin Price e Charles D. Moody. "A Fenton-like reaction to neutralize formaldehyde waste solutions". Environmental Science & Technology 23, n.º 2 (fevereiro de 1989): 166–69. http://dx.doi.org/10.1021/es00179a004.

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Goldstein, Sara, e Dan Meyerstein. "Comments on the Mechanism of the “Fenton-Like” Reaction". Accounts of Chemical Research 32, n.º 7 (julho de 1999): 547–50. http://dx.doi.org/10.1021/ar9800789.

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Kruk, Irena, Teresa Michalska, Aleksandra Kładna e Hassan Y. Aboul-Enein. "Prooxidant action of carazolol in the Fenton-like reaction". Luminescence 26, n.º 6 (14 de setembro de 2010): 429–33. http://dx.doi.org/10.1002/bio.1248.

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Oses-Pedraza, Rómulo, Estefanía Bonnail, Paris Lavin, Cristina Purcarea, Manuel Alarcón, Danae Irribarren-Riquelme e Jaime Rodríguez. "Fenton-Mediated Chlorophenol Degradation by Iron-Reducing Compounds Isolated from Endophytic Fungi in Atacama Puna Plateau Lecanicillium ATA01". Fermentation 8, n.º 4 (27 de março de 2022): 147. http://dx.doi.org/10.3390/fermentation8040147.

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Low-molecular-mass iron-reducing compounds (IRCs) were produced by entomopathogenic endophytic fungi Lecanicillium sp. ATA01 in liquid cultures. The extracellular hydrophilic extract contained three IRCs formed by peptides, iron and phenolate structures with molecular masses of 1207, 567 and 550 Da. These compounds were able to chelate and mediate the reduction of Fe+3 to Fe+2 and oxidized recalcitrant lignin-model substrates such as veratryl alcohol (VA), 2,6-dimethoxyphenol (DMP), and 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid (ABTS) with or without hydrogen peroxide. Besides, IRCs can promote the degradation of chlorophenols. The maximal degradation of p-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol, and pentachlorophenol was conducted at optimal degradation conditions for IRCs (pH 3.5, iron 100 mM, and H2O2 10 mM). Furthermore, Fenton-like reactions using the synthetic iron chelates DTPA and EDTA and free Fe+2 and Fe+3 were also carried out in order to compare with the reaction mediated by IRCs. The ferric IRCs displayed the ability to enhance the hydroxylation of chlorophenols as a part of a degradation mechanism of the IRC-assisted Fenton reaction. The complexed iron was more efficient than free iron in the Fenton-like reaction, and between them, the fungal chelates were more efficient than the synthetic mill chelates.

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Geng, Tie, Jiaguo Yan, Bin Li, Haiyuan Yan, Lei Guo, Qiang Sun, Zengfu Guan, Chunning Zhao, Shen Zhang e Weichao Wang. "Using SiO2-Supported MnO2@Fe2O3 Composite to Catalytically Decompose Waste Drilling Fluids Through Fenton-like Oxidation". Materials 17, n.º 22 (13 de novembro de 2024): 5540. http://dx.doi.org/10.3390/ma17225540.

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Waste drilling fluids produced from oil extraction can cause serious harm to the ecological environment; thus, the treatment of waste drilling fluids is urgent and important to ensure the sustainability and development of the oil extraction. In this work, we used the Fenton-like reaction method to degrade waste drilling fluids with SiO2-supported MnO2@Fe2O3 composite material as a catalyst in the presence of H2O2. During the Fenton-like reaction process, the MnO2@Fe2O3 interface exhibits exceptional activity by facilitating the production of ·OH species with high activity and strong oxidizing properties, which degrade the organic substances in the waste drilling fluids into smaller inorganic molecules, thereby reducing its COD value. Compared to the reaction only with H2O2, after reacting with sufficient SiO2-supported MnO2@Fe2O3 catalyst for 4 h at 60 °C in the presence of H2O2, the COD value of the waste drilling fluids is reduced by 36,495 mg L−1, a decrease of more than 95%. This performance is significantly superior to that of the traditional Fenton reagent FeSO4, which reduced the COD by 32,285 mg L−1, a decrease of 84%. This work provides an important composite catalyst, which is practically useful for the treatment of waste drilling fluids.

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Qin, Lu, Xin Yu, Kang Wang e Xitao Wang. "Spherical ZVI/Mn-C Bimetallic Catalysts for Efficient Fenton-like Reaction under Mild Conditions". Catalysts 12, n.º 4 (15 de abril de 2022): 444. http://dx.doi.org/10.3390/catal12040444.

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The heterogeneous Fenton-like reaction has been receiving increasing attention for its inexpensiveness and high efficiency in water treatment. In this study, a novel strategy was proposed for preparing spherical ZVI/Mn-C bimetallic catalysts with a high activity for a Fenton-like reaction by using the ammonium alginate assisted sol–gel method coupled with a carbothermic reduction. The results showed that the obtained ZVI/Mn-C spheres had a uniform size, smooth surface and good sphericity, and the particle size of ZVI was limited to about 30 nm by the carbon layer. Among all catalysts, the ZVI/Mn-C-31 catalyst exhibited the highest phenol degradation efficiency in the Fenton-like process, and almost 100% phenol degradation efficiency was achieved under neutral pH at room temperature within 5 min. Moreover, the ZVI/Mn-C-31/H2O2 system showed a 100% degradation efficiency for removing a wide range of aromatic pollutants, including catechol, resorcinol and o-nitrophenol. Moreover, the radicals-scavenging experiment illustrated that the ·OH played a key factor in mineralizing the organic matters, and the ·O2− generated from the MnO-H2O2 system accelerated the conversion rate of ferric iron to ferrous iron. Due to the synergistic effects between ZVI and MnO, the ZVI/Mn-C-31 catalyst performed excellently in the Fenton-like reaction at an extended pH range.

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Cihanoğlu, Aydın, Gönül Gündüz e Meral Dükkancı. "Influence of ultrasound on the heterogeneous Fenton-like oxidation of acetic acid". Water Science and Technology 76, n.º 10 (4 de agosto de 2017): 2793–801. http://dx.doi.org/10.2166/wst.2017.416.

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Abstract The main objective of this study is to investigate the effect of ultrasound on the heterogeneous Fenton-like oxidation of acetic acid, which is one of the most resistant carboxylic acids to oxidation. For this purpose, firstly, the degradation of acetic acid was examined by using ultrasound alone and the effects of different parameters such as: type of sonication system, ultrasonic power, and addition of H2O2 were investigated on the degradation of acetic acid. There was no chemical oxygen demand (COD) reduction in the presence of sonication alone. In the presence of the heterogeneous Fenton-like oxidation process alone, at 303 K, COD reduction reached only 7.1% after 2 h of reaction. However, the combination of the heterogeneous Fenton-like oxidation process with ultrasound increased the COD reduction from 7.1% to 25.5% after 2 h of reaction in an ultrasonic bath operated at 40 kHz, while the COD reduction only increased from 7.1% to 8.9% in the ultrasonic reactor operated at 850 kHz. This result indicates that the hybrid process of ultrasound and heterogeneous Fenton-like oxidation is a promising process to degrade acetic acid.

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Du, Yi Jun, Guo Peng Jiang, Xin Ping Fang e Mu Qing Qiu. "Kinetic of C.I. Reactive Black 5 by Fenton-Like Oxidation". Advanced Materials Research 690-693 (maio de 2013): 1512–15. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1512.

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The decolorization kinetic of C.I. Reactive Black 5 was studied using Fenton-like oxidation. The effect of the major system parameters, such as initial pH of the solution, concentration of H2O2, concentration of Fe3+ and reaction temperature on the kinetics was determined. The results indicate that the operating parameters, such as initial pH of dye solution, initial concentration of Fe2+ and H2O2, reaction temperature, have strong influences on the degradation of C.I. Reactive Black 5 by Fenton-like oxidation process. In addition, it was also found that the decolorization of C.I. Reactive Black 5 followed the first-order kinetics well.

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Wang, Shaobin. "A Comparative study of Fenton and Fenton-like reaction kinetics in decolourisation of wastewater". Dyes and Pigments 76, n.º 3 (janeiro de 2008): 714–20. http://dx.doi.org/10.1016/j.dyepig.2007.01.012.

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