Artykuły w czasopismach: „Photo-Fenton-like”

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Miller, Christopher J., Susan Wadley i T. David Waite. "Fenton, photo-Fenton and Fenton-like processes". Water Intelligence Online 16 (15.05.2017): 297–332. http://dx.doi.org/10.2166/9781780407197_0297.

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Dugandzic, Ana, Andjelka Tomasevic, Dunja Dabic, Natasa Sekuljica, Marina Radisic, Slobodan Petrovic i Dusan Mijin. "Degradation of nicosulfuron using fenton and fenton-like reactions". Chemical Industry and Chemical Engineering Quarterly 24, nr 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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Wu, C. H., J. T. Wu i Y. H. Lin. "Mineralization of sulfamethizole in photo-Fenton and photo-Fenton-like systems". Water Science and Technology 73, nr 4 (27.10.2015): 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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Arslan-Alaton, I., i F. Gurses. "Photo-Fenton-like and photo-fenton-like oxidation of Procaine Penicillin G formulation effluent". Journal of Photochemistry and Photobiology A: Chemistry 165, nr 1-3 (lipiec 2004): 165–75. http://dx.doi.org/10.1016/j.jphotochem.2004.03.016.

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Fassi, S., K. Djebbar, I. Bousnoubra, H. Chenini i T. Sehili. "Oxidation of bromocresol green by different advanced oxidation processes: Fenton, Fenton-like, photo-Fenton, photo-Fenton-like and solar light. Comparative study". Desalination and Water Treatment 52, nr 25-27 (26.06.2013): 4982–89. http://dx.doi.org/10.1080/19443994.2013.809971.

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Rehman, Faiza, Murtaza Sayed, Javed Ali Khan, Luqman Ali Shah, Noor S. Shah, Hasan M. Khan i Rozina Khattak. "Degradation of Crystal Violet Dye by Fenton and Photo-Fenton Oxidation Processes". Zeitschrift für Physikalische Chemie 232, nr 12 (27.11.2018): 1771–86. http://dx.doi.org/10.1515/zpch-2017-1099.

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Abstract The oxidative degradation of CV dye in aqueous media has been evaluated using Fenton (Fe2+/H2O2) and photo-Fenton (Fe2+/H2O2/UV) processes. Various operational parameters like H2O2 dosages, Fe2+ dosages and [CV]0 were optimized of both Fenton and photo-Fenton processes for the removal of CV dye from aqueous media. Kinetic results indicated that photo-Fenton process (kobs=0.0097 min−1, t1/2=71.45 min) is more effective than Fenton process (kobs=0.0074 min−1, t1/2=93.66 min). Second order rate constant of ˙OH radical with CV dye was calculated to be 3.96×109 M−1s−1. De-methylated organic intermediates of CV dye detected by LC-MS and some other intermediates like CH3COO−, HCOO−, NH4+ and Cl− were identified by ion-chromatography.

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Kuo, C. Y., C. Y. Pai, C. H. Wu i M. Y. Jian. "Effects of oxidant concentration and temperature on decolorization of azo dye: comparisons of UV/Fenton and UV/Fenton-like systems". Water Science and Technology 65, nr 11 (1.06.2012): 1970–74. http://dx.doi.org/10.2166/wst.2012.095.

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This study applies photo-Fenton and photo-Fenton-like systems to decolorize C.I. Reactive Red 2 (RR2). The oxidants were H2O2 and Na2S2O8; Fe2+, Fe3+, and Co2+ were used to activate these two oxidants. The effects of oxidant concentration (0.3–2 mmol/L) and temperature (25–55 °C) on decolorization efficiency of the photo-Fenton and photo-Fenton-like systems were determined. The decolorization rate constants (k) of RR2 in the tested systems are consistent with pseudo-first-order kinetics. The rate constant increased as oxidant concentration and temperature increased. Activation energies of RR2 decolorization in the UV/H2O2/Fe2+, UV/H2O2/Fe3+, UV/Na2S2O8/Fe2+ and UV/Na2S2O8/Fe3+ systems were 32.20, 39.54, 35.54, and 51.75 kJ/mol, respectively.

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Olmez-Hanci, Tugba, Idil Arslan-Alaton i Ozlem Gelegen. "Photo-Fenton-like treatment of K-acid: assessment of treatability, toxicity and oxidation products". Water Science and Technology 70, nr 6 (30.07.2014): 1056–64. http://dx.doi.org/10.2166/wst.2014.330.

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Photo-Fenton-like treatment of the commercially important naphthalene sulphonate K-acid (2-naphthylamine-3,6,8-trisulphonic acid) was investigated using UV-C, UV-A and visible light irradiation. Changes in toxicity patterns were followed by the Vibrio fischeri bioassay. Rapid and complete degradation of K-acid accompanied with nearly complete oxidation and mineralization rates (>90%) were achieved for all studied irradiation types. On the other hand, detoxification was rather limited and did not change significantly during photo-Fenton-like treatment. Several oxidation products could be identified via liquid chromatograph–mass spectrometer analyses, such as desulphonated and hydroxylated naphthalene derivatives, quinones, and ring-opening as well as dimerization products. Photo-Fenton-like treatment of K-acid with UV-C, UV-A and visible light irradiation occurred through a series of hydroxylation and desulphonation reactions, followed by ring cleavage. A common degradation pathway for photo-Fenton-like treatment of K-acid using different irradiation types was proposed.

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Kuo, Chao-Yin, i Chueh-Ying Pai. "Application of cuprous oxide synthesized from copper-containing waste liquid to treat aqueous reactive dye". Water Science and Technology 65, nr 9 (1.05.2012): 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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Guo, Li, Kailai Zhang, Xuanxuan Han, Qiang Zhao, Danjun Wang i Feng Fu. "2D In-Plane CuS/Bi2WO6 p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance". Nanomaterials 9, nr 8 (11.08.2019): 1151. http://dx.doi.org/10.3390/nano9081151.

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Photo-Fenton degradation of pollutants in wastewater is an ideal choice for large scale practical applications. Herein, two-dimensional (2D) in-plane CuS/Bi2WO6 p-n heterostructures have been successfully constructed by an in situ assembly strategy and characterized using XRD, XPS, SEM/TEM, EDX, UV-Vis-DRS, PL, TR-PL, ESR, and VB-XPS techniques. The XPS and the TEM results confirm the formation of CuS/Bi2WO6 heterostructures. The as-constructed CuS/Bi2WO6 showed excellent absorption in visible region and superior charge carrier separation efficiency due to the formation of a type-II heterojunctions. Under visible light irradiation, 0.1% CuS/Bi2WO6 heterostructure exhibited the best photo-Fenton-like catalytic performance. The degradation efficiency of Rhodamine B (RhB, 20 mg·L−1) can reach nearly 100% within 25 min, the apparent rate constant (kapp/min−1) is approximately 40.06 and 3.87 times higher than that of pure CuS and Bi2WO6, respectively. The degradation efficiency of tetracycline hydrochloride (TC-HCl, 40mg·L−1) can reach 73% in 50 min by employing 0.1% CuS/Bi2WO6 heterostructure as a photo-Fenton-like catalyst. The promoted photo-Fenton catalytic activity of CuS/Bi2WO6 p-n heterostructures is partly ascribed to its low carriers recombination rate. Importantly, CuS in CuS/Bi2WO6 heterostructures is conducive to the formation of heterogeneous photo-Fenton catalytic system, in which Bi2WO6 provides a strong reaction site for CuS to avoid the loss of Cu2+ in Fenton reaction, resulting in its excellent stability and reusability. The possible photo-Fenton-like catalytic degradation mechanism of RhB and TC-HCl was also elucidated on the basis of energy band structure analysis and radical scavenger experiments. The present study provides strong evidence for CuS/Bi2WO6 heterostructures to be used as promising candidates for photo-Fenton treatment of organic pollutants.

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Kim, Dong-Seog, i Young-Seek Park. "Decolorization of Rhodamine B by Fenton, Fonton-like and Photo-Fenton-like Oxidation". Korean Journal of Environmental Health Sciences 33, nr 2 (30.04.2007): 150–57. http://dx.doi.org/10.5668/jehs.2007.33.2.150.

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Šutka, Anna, Andris Šutka, Mārtiņš Vanags, Arnita Spule, Raivis Eglītis, Svetlana Vihodceva, Krišjānis Šmits, Aile Tamm i Linda Mežule. "Identifying Iron-Bearing Nanoparticle Precursor for Thermal Transformation into the Highly Active Hematite Photo-Fenton Catalyst". Catalysts 10, nr 7 (12.07.2020): 778. http://dx.doi.org/10.3390/catal10070778.

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The hematite photo-Fenton catalysis has attracted increasing attention because it offers strong oxidation of organic pollutants under visible light at neutral pH. In the present work, aqueous synthesis of hematite photo-Fenton catalysts with high activity is demonstrated. We compare photo-Fenton activity for hematite obtained by hydrolyzation at 60 °C or by a thermally induced transformation from iron-bearing nanoparticles, such as amorphous iron oxyhydroxide or goethite. A link between their structure and visible light photo-Fenton reactivity is established. The highest activity was observed for hematite obtained from goethite nanowires due to oblong platelet-like structure, high surface area and the presence of nanopores.

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Kanafin, Yerkanat N., Ardak Makhatova, Vasilios Zarikas, Elizabeth Arkhangelsky i Stavros G. Poulopoulos. "Photo-Fenton-Like Treatment of Municipal Wastewater". Catalysts 11, nr 10 (8.10.2021): 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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Cui, Yongping, Yaru Shang, Xiaohu Cheng, Ruixia Shi i Ping Yang. "Electrospun Zn Doped CuFe2O4 Nanofibers with Enhanced Photo Fenton-Like Catalytic Activity". Journal of Nanoscience and Nanotechnology 21, nr 3 (1.03.2021): 1517–25. http://dx.doi.org/10.1166/jnn.2021.18991.

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One dimensional Zn doped CuFe2O4 spinel ferrite nanofibers were successfully prepared via a facile electrospinning method followed by two different calcination routes. The results showed that the as-prepared nanofibers through two-step calcination exhibited more uniform size distribution in diameter compared with those calcined by one-step method. X-ray diffraction (XRD) results indicated that with the increase of Zn content the position of diffraction peaks of Zn doped CuFe2O4 slightly shift towards lower 2θ angle because the ionic sizes of the Zn2+ (0.74 Å) is larger than that of Cu2+ (0.69 Å). Fourier transform infrared spectroscopy (FTIR) results showed that with increasing Zn content the position of vibrational band (590 cm−1) shifted towards the smaller wavenumber. Generally, photo-generated carriers increased with the increasing of Zn content. The photo Fenton-like catalytic results revealed that the doping of Zn facilitated the enhancement of degradation efficiency of catalysts. Additionally, 10 at.% Zn doped CuFe2O4 exhibited the best photo Fenton-like catalytic activity and the degradation efficiency of Rhodamine B (RhB) could reach 100% in 40 min. Finally, the enhancement of photo Fenton-like catalytic mechanism of the Zn doped CuFe2O4 nanofibers was mainly attributed to actived spinel structure lattice by Zn doping, which allows more Cu2+ and Fe3+ ions are involved in the photo Fenton-like catalytic reaction.

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Giribabu, P. V. S., Lakshmi Priya, Sarikumar i G. Swaminathan. "Comparison of Degradation Phenomenon of Reactive Dye Direct Red 80 by Fenton, Photo Fenton and H2O2+UV-C". Asian Review of Civil Engineering 4, nr 1 (5.05.2015): 32–35. http://dx.doi.org/10.51983/tarce-2015.4.1.2210.

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Fenton, Photo Fenton and H2O2+UVC experiments were conducted on a reactive dye Direct Red 80. The influence of different parameters like initial pH, initial concentration of H2O2, Fe (II) dosage was found on it. The optimum pH value using Fenton degradation is in between 2.5 and 3.0. As H2O2 was increased, the rate of degradation was found to increase up to 10mM and thereafter it decreased. As Fe (II) was increased, the rate of degradation was found to increase up to 35mg/L and then it decreased. Comparisons of final degradation by Fenton, Photo Fenton and H2O2+UV C methods were done.

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Zeb, Akif, Shafaq Sahar, Umair Yaqub Qazi, Atheer Hameid Odda, Naseeb Ullah, Ya-Nan Liu, Ishtiaq A. Qazi i An-Wu Xu. "Intrinsic peroxidase-like activity and enhanced photo-Fenton reactivity of iron-substituted polyoxometallate nanostructures". Dalton Transactions 47, nr 21 (2018): 7344–52. http://dx.doi.org/10.1039/c8dt01146j.

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Fe-substituted heteropolyacid nanostructures are developed for the efficient degradation of pollutants via Fenton and photo-Fenton reactions and show efficient artificial enzyme-like activity for oxidation.

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Wang, Jia, Tao Zhou, Juan Mao i Xiaohui Wu. "Comparative study of sulfamethazine degradation in visible light induced photo-Fenton and photo-Fenton-like systems". Journal of Environmental Chemical Engineering 3, nr 4 (grudzień 2015): 2393–400. http://dx.doi.org/10.1016/j.jece.2015.08.024.

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Çokay, Ebru, i Merve Öztamer. "Degradation of Triclosan by Photo-Fenton like Oxidation". Deu Muhendislik Fakultesi Fen ve Muhendislik 19, nr 56 (1.01.2017): 583–98. http://dx.doi.org/10.21205/deufmd.2017195655.

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Niu, De-Li, Kai Bao, Xuan-Ye Huang, Mao-Juan Bai i Jun Wan. "Preparation of Co-Doped Graphitic Carbon Nitride and Degradation of MB by Heterogeneous Photo-Fenton-like Reaction System". Revista de Chimie 73, nr 2 (2.05.2022): 102–11. http://dx.doi.org/10.37358/rc.22.2.8523.

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In this study, Co-porous-g-C3N4(porous Co-Doped graphitic carbon nitride) was synthesized by a one-step calcination method successfully. Co-porous-g-C3N4 was characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance, and specific surface area determination. The Photo- Fenton-like system was successfully constructed under the condition of coexistence of Co-porous-g-C3N4 and H2O2. The synergistic effect of Fenton-like system and photo-catalysis was realized. Through the optimization of experimental conditions, the best photocatalytic performance of this heterogeneous reaction system was achieved. The degradation rate of MB (methylene blue, 40 mg/L) could reach 98.3% at 90 min. Co-porous-g-C3N4 had photocatalytic degradation activity for different organic pollutants and had wonderful recyclability and stability. The main degradation effect was attributed to �O2- which could be generated through two channels in the Photo- Fenton-like system. Moreover, the rate of photogenerated electron-hole complexation could be decreased due to the reaction of low-valent cobalt and photoelectrons in this heterogeneous reaction system.

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Devi, L., S. Kumar i K. Reddy. "Photo fenton like process Fe3+/(NH4)2S2O8/UV for the degradation of Di azo dye congo red using low iron concentration". Open Chemistry 7, nr 3 (1.09.2009): 468–77. http://dx.doi.org/10.2478/s11532-009-0036-9.

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AbstractDegradation of Congo Red (CR) a di azo dye in aqueous solution is investigated by a Photo Fenton like process using Fe3+ ions as the catalyst and peroxy disulfate as the oxidant. The influence of various reaction parameters like, concentration of Fe3+ ions, concentration of the dye, concentration of ammonium persulfate, pH of the solution and the presence of hydroxyl radical scavenger are studied and optimal conditions are reported. The degradation rate decreased at higher dye concentration and at higher pH. The rate constant (k), catalytic efficiency (kc) and process efficiency (Φ) are evaluated for different concentration of Fe3+ ions. The degradation of CR by the photo Fenton like process leads to the formation of 4-Amino, 3-azo naphthalene sulphonic acid, dihydroxy substituted naphthalene, dihydroxy substituted biphenyl, phenol, quinol etc., as intermediates, based on which probable degradation mechanism is proposed. These results show that a photo Fenton like process could be useful technology for the mineralization of di azo dyes under lower concentration of iron in acidic conditions. The present process is advantageous as it lowers the sludge production resulting from the iron comple

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Wang, Jiaojiao, Xiaoqing Jia, Denghui Shang, Liangbo Xie, Yi Li, He Zhang, Sihui Zhan i Wenping Hu. "Constructing Cu₂O/Bi₂MoO₆ p–n heterojunction towards boosted photo-assisted-electro-Fenton-like synergy degradation of ciprofloxacin". Environmental Science: Nano 8, nr 12 (2021): 3629–42. http://dx.doi.org/10.1039/d1en00894c.

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Aseev, Denis, Agniya Batoeva, Marina Sizykh, Daniil Olennikov i Galina Matafonova. "Degradation of Bisphenol A in an Aqueous Solution by a Photo-Fenton-Like Process Using a UV KrCl Excilamp". International Journal of Environmental Research and Public Health 18, nr 3 (28.01.2021): 1152. http://dx.doi.org/10.3390/ijerph18031152.

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Bisphenol A (BPA), a precursor to important plastics, is regarded as a common aquatic micropollutant with endocrine-disrupting activity. In the present study, we explored the capability of a UV KrCl excilamp (222 nm) to degrade BPA by a photo-Fenton-like process using persulfate under flow-through conditions. The first-order rate constants of degradation were obtained and the mineralization of dissolved organic carbon (DOC) was estimated. The results showed complete BPA degradation and high DOC mineralization (70–97%). A comparative analysis of degradation rates and DOC removal in the examined systems (UV, Fe2+/S2O82−, UV/S2O82− and UV/Fe2+/S2O82−) revealed a significant synergistic effect in the photo-Fenton-like system (UV/Fe2+/S2O82−) without the accumulation of toxic intermediates. This indicated that the BPA was oxidized via the conjugated radical chain mechanism, which was based on the photo-induced and catalytic processes involving HO• and SO4−• radicals. The primary intermediates of BPA degradation in the UV/Fe2+/S2O82− system were identified by HPLC/MS and the oxidation pathway was proposed. The high performance of the photo-Fenton-like process employing a quasi-monochromatic UV radiation of a KrCl excilamp offers promising potential for an efficient removal of such micropollutants from aqueous media.

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Ban, F. C., X. T. Zheng i H. Y. Zhang. "Photo-assisted heterogeneous Fenton-like process for treatment of PNP wastewater". Journal of Water, Sanitation and Hygiene for Development 10, nr 1 (6.02.2020): 136–45. http://dx.doi.org/10.2166/washdev.2020.087.

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Abstract The purpose of this study was to investigate the effect of photo-assisted heterogeneous Fenton on p-nitrophenol (PNP) wastewater treatment by a homemade reactor. Supported Fe-Ce/Al2O3 was used as a catalyst and H2O2 as an oxidant to treat simulated p-nitrophenol wastewater under ultraviolet light. The effects of H2O2 dosage, catalyst dosage, initial solution pH value, reaction temperature and reaction time on the removal rate of p-nitrophenol in a photo-assisted heterogeneous Fenton system were determined. According to the relation between the concentration of each component and time, the relation curve is fitted, and then the kinetic equation is established. Finally, we obtained the optimum process conditions to achieve the PNP wastewater removal rate of 98.7%. The degradation of the photo-assisted heterogeneous Fenton method conforms to the first-order kinetic model, and the kinetic equation is . Therefore, photo-assisted heterogeneous Fenton treatment of PNP wastewater is effective and can be used in the treatment of refractory wastewater.

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Wang, Qiao, Peng Xu, Guangshan Zhang, Wen Zhang, Limin Hu i Peng Wang. "Characterization of visible-light photo-Fenton reactions using Fe-doped ZnS (Fex-ZnS) mesoporous microspheres". Physical Chemistry Chemical Physics 20, nr 27 (2018): 18601–9. http://dx.doi.org/10.1039/c8cp02609b.

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Celentano, Maurizio, Anshuman Jakhmola, Paolo Antonio Netti i Raffaele Vecchione. "Irreversible photo-Fenton-like triggered agglomeration of ultra-small gold nanoparticles capped with crosslinkable materials". Nanoscale Advances 1, nr 6 (2019): 2146–50. http://dx.doi.org/10.1039/c8na00353j.

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Zhang, Guoyang, Shuo Lu, Chun Zhang, Bingdang Wu, Yong Liang, Zhihao Chen, Li Zhang i Shujuan Zhang. "Metal-free generation of hydroxyl radicals by benzoate-mediated decomposition of peroxides". Chemical Communications 56, nr 54 (2020): 7443–46. http://dx.doi.org/10.1039/d0cc02633f.

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Tokumura, M., M. Sekine, Y. Morito i Y. Kawase. "Decolorization and mineralization of Oolong tea polyphenols in colored soft drink wastewater by photo Fenton reaction". Water Science and Technology 63, nr 9 (1.05.2011): 1894–98. http://dx.doi.org/10.2166/wst.2011.405.

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The decolorization and the mineralization of the colored soft drink wastewater including Oolong tea polyphenols by the photo Fenton reaction have been investigated. The decolorization of the colored soft drink wastewater including Oolong tea polyphenols by the photo Fenton reaction could be divided into 3 phases. Just after H2O2 was added to the solution, the color of the solution immediately increased from absorbance of 0.247 to 0.711 at the wavelength of 400 nm, which was defined as the 1st phase. Subsequently the significant decolorization by the photo Fenton reaction occurred at the 2nd phase. Finally, complete decolorization (the color attributed to the color of Fe3+) could be achieved in 180 min at the 3rd phase. The instantaneous and considerable color increase at the 1st phase could be attributed to the formation of intermediate colored compounds like quinones and soluble iron complexes produced by the Fenton reaction. About 95% mineralization of model colored soft drink wastewater with 229 mg L−1 initial TOC concentration was achieved after 165 min.

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Magomedova, Asiyat, Abdulgalim Isaev, Farid Orudzhev, Dinara Sobola, Rabadanov Murtazali, Alina Rabadanova, Nabi S. Shabanov i in. "Magnetically Separable Mixed-Phase α/γ-Fe2O3 Catalyst for Photo-Fenton-like Oxidation of Rhodamine B". Catalysts 13, nr 5 (11.05.2023): 872. http://dx.doi.org/10.3390/catal13050872.

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Iron oxides are widely used as catalysts for photo-Fenton-like processes for dye oxidation. In this study, we report on the synthesis of an α/γ-Fe2O3 mixed-phase catalyst with magnetic properties for efficient separation. The catalyst was synthesized using glycine–nitrate precursors. The synthesized α/γ-Fe2O3 samples were characterized using scanning electron microscopy, X-ray diffraction spectroscopy (XRD), Raman shift spectroscopy, X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometer (VSM). The diffraction peaks were indexed with two phases, α-Fe2O3 as the main phase (79.6 wt.%) and γ-Fe2O3 as the secondary phase (20.4 wt.%), determined using the Rietveld refinement method. The presence of Fe2+ was attributed to oxygen vacancies. The mixed-phase α/γ-Fe2O3 catalyst exhibited remarkable photo-Fenton-like degradation performance for Rhodamine B (RhB) in neutral pH. The effects of operating parameters, including H2O2 concentration, catalyst concentration, and RhB concentration, on the degradation efficiency were investigated. The removal rates of color were 99.2% after 12 min at optimal conditions of photo-Fenton-like oxidation of RhB. The sample exhibited a high saturation magnetization of 28.6 emu/g. Additionally, the α/γ-Fe2O3 mixed-phase catalyst showed long-term stability during recycle experiments, with only a 5% decrease in activity.

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Qiu, Pengpeng, Kyounglim Kang, Kyungho Kim, Wei Li, Mingcan Cui i Jeehyeong Khim. "Facile synthesis of uniform yolk–shell structured magnetic mesoporous silica as an advanced photo-Fenton-like catalyst for degrading rhodamine B". RSC Advances 5, nr 116 (2015): 96201–4. http://dx.doi.org/10.1039/c5ra15693a.

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Ghiselli, Gislaine, Wilson F. Jardim, Marta I. Litter i Héctor D. Mansilla. "Destruction of EDTA using Fenton and photo-Fenton-like reactions under UV-A irradiation". Journal of Photochemistry and Photobiology A: Chemistry 167, nr 1 (wrzesień 2004): 59–67. http://dx.doi.org/10.1016/j.jphotochem.2004.02.005.

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Rezaei, Fatemeh, i Davide Vione. "Effect of pH on Zero Valent Iron Performance in Heterogeneous Fenton and Fenton-Like Processes: A Review". Molecules 23, nr 12 (29.11.2018): 3127. http://dx.doi.org/10.3390/molecules23123127.

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Heterogeneous Fenton processes with solid catalysts have gained much attention for water and wastewater treatment in recent years. In the field of solid catalysts, zero valent iron (ZVI) is among the most applicable due to its stability, activity, pollutant degradation properties and environmental friendliness. The main limitation in the use of ZVI in heterogeneous Fenton systems is due to its deactivation in neutral and alkaline conditions, and Fenton-like processes have been developed to overcome this difficulty. In this review, the effect of solution pH on the ZVI-Fenton performance is discussed. In addition, the pH trend of ZVI efficiency towards contaminants removal is also considered in oxic solutions (i.e., in the presence of dissolved O2 but without H2O2), as well as in magnetic-field assisted Fenton, sono-Fenton, photo-Fenton and microwave-Fenton processes at different pH values. The comparison of the effect of pH on ZVI performance, taking into account both heterogeneous Fenton and different Fenton-like processes, can guide future studies for developing ZVI applications in water and wastewater treatment.

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Costamagna, Mattia, Nuno P. F. Gonçalves i Alessandra Bianco Prevot. "Environmental Assessment of Humic Acid Coated Magnetic Materials Used as Catalyst in Photo-Fenton Processes". Catalysts 10, nr 7 (10.07.2020): 771. http://dx.doi.org/10.3390/catal10070771.

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Persistent organic pollutants have been increasingly detected in natural waters, and this represents a real challenge to the quality of this resource. To remove these species, advanced treatment technologies are required. Among these technologies, Fenton-like and photo-Fenton-like processes have been investigated for the removal of pollutants from water. Delicate aspects of photo-Fenton processes are that light-driven processes are energy intensive and require a fair amount of chemical inputs, which strongly affects their overall environmental burdens. At present, aside from determining the efficiency of the processes to remove pollutants of a particular technology, it becomes fundamental to assess also the environmental sustainability of the overall process. In this work, the methodology of the life cycle assessment (LCA) was applied to identify the hotspots of using magnetite particles covered with humic acid (Fe3O4/HA) as a heterogeneous photo-Fenton catalyst for water remediation. The sustainability of the overall process was considered, and a comparative LCA study was performed between H2O2 and persulfate activation at different pH. The addition of humic substances to the particles allows the effectiveness of the catalyst to improve without increasing the environmental impacts; these processes are strongly correlated with energy consumption and therefore with the efficiency of the process. For this reason, working at acidic pH allows us to contain the impacts.

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Fatimah, Is, Tuty Alawiyah i Iwan Sumarlan. "PREPARASI Fe3+/TiO2- MONTMORILLONIT SEBAGAI KATALIS PADA DEGRADASI ZAT WARNA AZO". Reaktor 14, nr 4 (2.12.2014): 255. http://dx.doi.org/10.14710/reaktor.14.4.255-260.

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Dalam penelitian ini dilakukan preparasi material Fe3+/TiO2-Montmorillonit dan uji aktivitasnya sebagai katalis pada degradasi senyawa azo. Keberhasilan preparasi material dipelajari melalui karakterisasi menggunakan X-ray Diffraction, BET surface area analyzer dan Diffuse Reflectance UV-Visible. Peranan katalitik material hasil preparasi pada degradasi senyawa azo: metil jingga(MO) dan metilena biru(MB) dipelajari melalui studi kinetika reaksi dengan mekanisme mirip foto-Fenton (Photo-Fenton like mechanism). Hasil penelitian menunjukkan keberhasilan preparasi material Fe3+/TiO2-Montmorillonit serta tercapainya tujuan penggunaannya sebagai katalis untuk degradasi zat warna azo melalui mekanisme Photo-Fenton like. Simulasi terhadap data kinetika menunjukkan bahwa degradasi kedua zat warna azo dengan katalis hasil preparasi mengikuti model kinetika Langmuir-Hinshelwood dengan nilai k dan K untuk MO berturut-turut adalah sebesar 8,83x10-7 M/detik dan 328,29 dan untuk MB sebesar 4,56x10-5 M dan 555,60. Nilai konstanta laju reaksi dan konstanta adsorpsi-desorpsi reaksi degradasi kedua zat warna menjelaskan peranan mekanisme interaksi permukaan dalam proses katalisis.

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Kuriechen, Selma K., Sepperumal Murugesan i Samuel Paul Raj. "Mineralization of Azo Dye Using Combined Photo-Fenton and Photocatalytic Processes under Visible Light". Journal of Catalysts 2013 (4.04.2013): 1–6. http://dx.doi.org/10.1155/2013/104019.

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Visible-light-assisted photodegradation of an azo dye, Reactive Red 180 (RR180), in the presence of nitrogen-doped TiO2 (N-TiO2) has been studied. The photodegradation of RR180 is evaluated through decolorization studies and total organic carbon analysis. The efficacy of hydrogen peroxide (H2O2), potassium peroxomonosulfate (oxone or PMS), and potassium peroxodisulfate (PDS) in improving the photodegradation of the dye in the N-TiO2-RR180 system is also examined. The effect of combining photo-Fenton-like reaction with N-TiO2-mediated photodegradation of RR180 under visible light has been investigated. The photoactivity of N-TiO2-RR180-Fe3+/Cu2+-oxidant systems is compared with the individual techniques of photocatalysis and photo-Fenton-like reactions. The coupled system possesses superior photomineralization ability towards the abatement of RR180.

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Ballesteros, S. García, M. Costante, R. Vicente, M. Mora, A. M. Amat, A. Arques, L. Carlos i F. S. García Einschlag. "Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study". Photochemical & Photobiological Sciences 16, nr 1 (2017): 38–45. http://dx.doi.org/10.1039/c6pp00236f.

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Vu, An Nang, Ngoc Hoa Thi Le, Linh Thi My Nguyen, Khoa Tien Le i Hieu Van Le. "Preparation and photo fenton-like activities of CuO/nanocellulose composite". Science and Technology Development Journal - Natural Sciences 5, nr 2 (16.04.2021): first. http://dx.doi.org/10.32508/stdjns.v5i2.918.

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A combination between the nanostructured photocatalyst and cellulose-based materials promotes a new functionality of cellulose towards the development of new bio-hybrid materials for water treatment and renewable energy applications. In this study, nanocellulose (CNC) was synthesized from sugarcane bagasse (SCB) biomass via formic /peroxyformic acid process treatment and acid hydrolysis at an atmospheric pressure. The resulting CNC of sugarcane bagasse were characterized by crystallinity index, chemical structure and morphology. X-ray diffraction (XRD) analysis revealed that the crystallinity increased with successive treatments. Images generated by TEM showed that CNC was rod-like in morphology, average diameter and length of 10 nm and 410 nm, respectively. The obtained CNC was used as a biotemplate for the synthesis of copper oxide (CuO) nanostructures through in - situ solution casting method. The photo-Fenton catalytic activity was evaluated via the degradation of methylene blue under sunlight irradiation with H2O2 as a oxidizing agent. The methylene blue degradation ratio of CuO/ CNC composite could achieve 98% in 150 min. The addition of H2O2 enhanced photocatalytic activities of the CuO/CNC. H2O2 not only prevented the recombination of charge carriers by accepting the photogenerated electrons and holes effectively but also produced additional OH.

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Orak, Ceren, Süheyda Atalay i Gülin Ersöz. "Degradation of ethylparaben using photo-Fenton-like oxidation over BiFeO3". ANADOLU UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY A - Applied Sciences and Engineering 17, nr 5 (20.12.2016): 915. http://dx.doi.org/10.18038/aubtda.279859.

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Hurtado, Lourdes, Deysi Amado-Piña, Gabriela Roa-Morales, Ever Peralta-Reyes, Eduardo Martin del Campo i Reyna Natividad. "Comparison of AOPs Efficiencies on Phenolic Compounds Degradation". Journal of Chemistry 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/4108587.

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In this work, a comparison of the performances of different AOPs in the phenol and 4-chlorophenol (4-CP) degradation at lab and pilot scale is presented. It was found that, in the degradation of phenol, the performance of a coupled electro-oxidation/ozonation process is superior to that observed by a photo-Fenton process. Phenol removal rate was determined to be 0.83 mg L−1 min−1 for the coupled process while the removal rate for photo-Fenton process was only 0.52 mg L−1 min−1. Regarding 4-CP degradation, the complete disappearance of the molecule was achieved and the efficiency decreasing order was as follows: coupled electro-oxidation/ozonation > electro-Fenton-like process > photo-Fenton process > heterogeneous photocatalysis. Total organic carbon was completely removed by the coupled electro-oxidation/ozonation process. Also, it was found that oxalic acid is the most recalcitrant by-product and limits the mineralization degree attained by the technologies not applying ozone. In addition, an analysis on the energy consumption per removed gram of TOC was conducted and it was concluded that the less energy consumption is achieved by the coupled electro-oxidation/ozonation process.

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Chen, Tianming, Yanqiu Zhang, Jinlong Yan, Cheng Ding, Chuntao Yin i Hui Liu. "Heterogeneous photodegradation of mesotrione in nano α-Fe2O3/oxalate system under UV light irradiation". RSC Advances 5, nr 17 (2015): 12638–43. http://dx.doi.org/10.1039/c4ra11871e.

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Qiu, Bocheng, Mingyang Xing i Jinlong Zhang. "Stöber-like method to synthesize ultralight, porous, stretchable Fe2O3/graphene aerogels for excellent performance in photo-Fenton reaction and electrochemical capacitors". Journal of Materials Chemistry A 3, nr 24 (2015): 12820–27. http://dx.doi.org/10.1039/c5ta02675j.

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García Ballesteros, S., M. Costante, R. Vicente, M. Mora, A. M. Amat, A. Arques, L. Carlos i F. S. García Einschlag. "Correction: Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study". Photochemical & Photobiological Sciences 17, nr 6 (2018): 854. http://dx.doi.org/10.1039/c8pp90025f.

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Correction for ‘Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study’ by S. García Ballesteros et al., Photochem. Photobiol. Sci., 2017, 16, 38–45.

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Li, Xi, Xiao Zhang, Shiwen Wang, Peng Yu, Yanhua Xu i Yongjun Sun. "Highly enhanced heterogeneous photo-Fenton process for tetracycline degradation by Fe/SCN Fenton-like catalyst". Journal of Environmental Management 312 (czerwiec 2022): 114856. http://dx.doi.org/10.1016/j.jenvman.2022.114856.

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Tolba, Aya, Mohamed Gar Alalm, Mohamed Elsamadony, Alsayed Mostafa, Hafez Afify i Dionysios D. Dionysiou. "Modeling and optimization of heterogeneous Fenton-like and photo-Fenton processes using reusable Fe3O4-MWCNTs". Process Safety and Environmental Protection 128 (sierpień 2019): 273–83. http://dx.doi.org/10.1016/j.psep.2019.06.011.

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Bensalah, Nasr, Mohammad I. Ahmad i Ahmed Bedoui. "Catalytic Degradation of 4-Ethylpyridine in Water by Heterogeneous Photo-Fenton Process". Applied Sciences 9, nr 23 (25.11.2019): 5073. http://dx.doi.org/10.3390/app9235073.

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In this work, the degradation of 4-ethylpyridine (4EP) in water by a heterogeneous photo-Fenton process (H2O2/Fe3O4/ultraviolet irradiation (UV)) was investigated. More rapid and effective 4EP degradation was obtained with H2O2/Fe3O4/UV than Fenton-like (H2O2/Fe3O4) and UV/H2O2, which is due to the larger production of hydroxyl radicals from the chemical and photolytic decomposition of H2O2. The operational conditions were varied during 4EP degradation experiments to evaluate the effects of pH, catalyst, concentration, and temperature on the kinetics and efficiency of H2O2/Fe3O4/UV oxidation. Under optimal conditions (100 mg/L 4EP, [H2O2] = 1000 mg/L, Fe3O4 = 40 mg/L, pH = 3 and room temperature, 300 rpm), 4EP was totally declined and more than 93% of the total organic carbon (TOC) was eliminated. Liquid chromatography analysis confirmed the formation of aromatic and aliphatic intermediates (4-hydroxypyridine, 4-pyridone, malonic, oxalic, and formic acids) that resulted in being mineralized. Ion chromatography analysis demonstrated the stoichiometric release of NH4+ ions during 4EP degradation by heterogeneous photo-Fenton oxidation. The reuse of the heterogeneous catalyst was evaluated after chemical and heat treatment at different temperatures. The heat-treated catalyst at 500 °C presented similar activity than the pristine Fe3O4. Accordingly, heterogeneous photo-Fenton oxidation can be an alternative method to treat wastewaters and groundwater contaminated with pyridine derivatives and other organic micropollutants. The combination of heterogeneous photo-Fenton oxidation with classical biological methods can be proposed to reduce the overall cost of the treatment in large-scale water treatment plants.

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Wang, Xueqing, Qiaoyue Zhang, Shun-Xing Liang, Zhe Jia, Wenchang Zhang, Weimin Wang i Lai-Chang Zhang. "Fe-Based Metallic Glasses and Dyes in Fenton-Like Processes: Understanding Their Intrinsic Correlation". Catalysts 10, nr 1 (1.01.2020): 48. http://dx.doi.org/10.3390/catal10010048.

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Fe-based metallic glasses have been demonstrated as effective heterogeneous catalysts in Fenton-like processes for dye degradation. Yet, currently corresponding studies have limitations due to the limited study object (dyes) and the correlation between metallic glasses and dye pollutants in Fenton-like processes is still not comprehensively studied. Accordingly, this work intensively investigated the thermal catalytic behavior correlations between two Fe-based metallic glasses (Fe78Si9B13 and Fe73.5Si13.5B9Cu1Nb3) and eight different dyes. Results indicated a lower activation energy in the more active metallic glass and a dependence of the activation energy of Fe-based metallic glasses in dye solutions. In addition, a high H2O2 concentration led to a declined catalytic efficiency but a photo-enhanced Fenton-like process overcame this limitation at high concentration of H2O2 due to the decrease of pH and enhancement of irradiation. Furthermore, the average mineralization rates of Fe78Si9B13 and Fe73.5Si13.5B9Cu1Nb3 have been measured to be 42.7% and 12.6%, respectively, and the correlation between decolorization and mineralization revealed that a faster decolorization in a Fenton-like process contributed to a higher mineralization rate. This work provides an intrinsic viewpoint of the correlation between Fe-based metallic glasses and dyes in Fenton-like processes and holds the promise to further promote the industrial value of metallic glasses.

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Cuerda-Correa, Eduardo Manuel, María F. Alexandre-Franco i Carmen Fernández-González. "Advanced Oxidation Processes for the Removal of Antibiotics from Water. An Overview". Water 12, nr 1 (27.12.2019): 102. http://dx.doi.org/10.3390/w12010102.

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In this work, the application of advanced oxidation processes (AOPs) for the removal of antibiotics from water has been reviewed. The present concern about water has been exposed, and the main problems derived from the presence of emerging pollutants have been analyzed. Photolysis processes, ozone-based AOPs including ozonation, O3/UV, O3/H2O2, and O3/H2O2/UV, hydrogen peroxide-based methods (i.e., H2O2/UV, Fenton, Fenton-like, hetero-Fenton, and photo-Fenton), heterogeneous photocatalysis (TiO2/UV and TiO2/H2O2/UV systems), and sonochemical and electrooxidative AOPs have been reviewed. The main challenges and prospects of AOPs, as well as some recommendations for the improvement of AOPs aimed at the removal of antibiotics from wastewaters, are pointed out.

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Sun, Dazhi, Jiayi Yang, Feng Chen, Zhe Chen i Kangle Lv. "Hollow Nanospheres Organized by Ultra-Small CuFe2O4/C Subunits with Efficient Photo-Fenton-like Performance for Antibiotic Degradation and Cr(VI) Reduction". Catalysts 12, nr 7 (23.06.2022): 687. http://dx.doi.org/10.3390/catal12070687.

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Hollow transition metal oxides have important applications in the degradation of organic pollutants by a photo-Fenton-like process. Herein, uniform, highly dispersible hollow CuFe2O4/C nanospheres (denoted as CFO/C-PNSs) were prepared by a one-pot approach. Scanning electron microscope (SEM) and transmission electron microscope (TEM) images verified that the CFO/C-PNS catalyst mainly presents hollow nanosphere morphology with a diameter of 250 ± 30 nm. Surprisingly, the photodegradation test results revealed that CFO/C-PNSs had an excellent photocatalytic performance in the elimination of various organic contaminants under visible light through the efficient Fenton catalytic process. Due to the unique hollow structure formed by the assembly of ultra-small CFO/C subunits, the catalyst exposes more reaction sites, improving its photocatalytic activity. More importantly, the resulting magnetically separable CFO/C-PNSs exhibited excellent stability. Finally, the possible photocatalytic reaction mechanism of the CFO/C-PNSs was proposed, which enables us to have a clearer understanding of the photo-Fenton mechanism. Through a series of characterization and analysis of degradation behavior of CFO/C-PNS samples over antibiotic degradation and Cr(VI) reduction, •OH radicals generated from H2O2 decomposition played an essential role in enhancing the reaction efficiency. The present work offered a convenient method to fabricate hollow transition metal oxides, which provided impetus for further development in environmental and energy applications. Highlights: Novel hollow CuFe2O4/C nanospheres were prepared by a facile and cost-effective method. CuFe2O4/C exhibited excellent photo-Fenton-like performance for antibiotic degradation. Outstanding photocatalytic performance was attributed to the specific hollow cavity-porous structure. A possible mechanism for H2O2 activation over hollow CuFe2O4/C nanospheres was detailed and discussed.

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Zhang, Mai, K. P. Annamalai, Tianlu Chen i Yousheng Tao. "Synthesis of Cu2S-TiO2/MWCNTs Nanocomposites for Photo- Fenton-like Reaction". Recent Innovations in Chemical Engineering (Formerly Recent Patents on Chemical Engineering) 11, nr 1 (11.06.2018): 15–19. http://dx.doi.org/10.2174/2405520411666180219151624.

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Cokay, Ebru. "Atrazine treatment with heterogeneous Photo-Fenton like oxidation using statically approach". Pamukkale University Journal of Engineering Sciences 25, nr 6 (2019): 705–10. http://dx.doi.org/10.5505/pajes.2018.20633.

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Ju, Lingling, Zhiyuan Chen, Liang Fang, Wen Dong, Fengang Zheng i Mingrong Shen. "Sol-Gel Synthesis and Photo-Fenton-Like Catalytic Activity of EuFeO3Nanoparticles". Journal of the American Ceramic Society 94, nr 10 (2.05.2011): 3418–24. http://dx.doi.org/10.1111/j.1551-2916.2011.04522.x.

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