Статті в журналах: "Modified-Fenton"

1

Naumczyk, Jeremi, Izabela Prokurat, and Piotr Marcinowski. "Landfill Leachates Treatment by /UV, /, Modified Fenton, and Modified Photo-Fenton Methods." International Journal of Photoenergy 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/909157.

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Advanced oxidation processes (AOPs) such as H2O2/UV, O3/H2O2, modified Fenton, and modified photo-Fenton processes have been investigated in terms of the treatment of landfill leachate with ratio of BOD5/COD in the range of 0.22 to 0.24. The modification of Fenton and photo-Fenton processes consisted in the inclusion of precipitation and separation of humic substances at pH 3. Due to the precipitation, the value of COD decreased by 39% and BOD5by 7.1%. The modification of the processes allowed us to improve the efficiency and to decrease the doses of reagents necessary to continue the process. Modified photo-Fenton process proved to be the most effective (92.7% COD removal) of all processes investigated. Additionally, modified-Fenton process was much more effective than the other two processes when compared up to 120 min, while after longer times it gave the least satisfactory results. After 30 min of modified-Fenton process BOD5/COD ratio increased to 0.43. The parameter referred to as “efficiency of oxidants” was used to estimate the efficiency of all the processes—its value varied from 178 to 239%. Various substances including phthalates, hydrocarbons, silanes, and siloxanes were identified in raw and treated leachate.

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2

Xie, Yanjun, Zefang Xiao, and Carsten Mai. "Degradation of chemically modified Scots pine (Pinus sylvestris L.) with Fenton reagent." Holzforschung 69, no. 2 (February 1, 2015): 153–61. http://dx.doi.org/10.1515/hf-2014-0067.

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AbstractThe Fenton reaction is supposed to play a key role in the initial wood degradation by brown rot fungi. Wood was modified with 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) and glutaraldehyde (GA) to various weight percentage gains in order to study if these types of modifications are able to reduce wood degradation by Fenton reagent. Veneers modified with higher concentrations (1.2 and 2.0 mol l-1) of both chemicals exhibited minor losses in mass and tensile strength during treatment with Fenton reagent, which shows restrained oxidative degradation by hydroxyl radicals. The decomposition rate of H2O2was lower in the Fenton solutions containing modified veneers than in those containing unmodified controls. More CO2evolved in systems containing unmodified veneers than in systems with modified veneers, indicating that modification protected wood from mineralisation. The reason for the enhanced resistance of modified wood to the Fenton reaction is attributed to impeded diffusion of the reagent into the cell wall rather than to inhibition of the Fenton reaction itself. The results show that wood modification with DMDHEU and GA is able to restrain the degradation of wood by the Fenton reaction and can explain why modified wood is more resistant to brown rot decay.

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3

Mackul’ak, Tomáš, Josef Prousek, and L’ubomír Švorc. "Degradation of atrazine by Fenton and modified Fenton reactions." Monatshefte für Chemie - Chemical Monthly 142, no. 6 (April 28, 2011): 561–67. http://dx.doi.org/10.1007/s00706-011-0504-8.

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4

Goi, A., Y. Veressinina, and M. Trapido. "Degradation of salicylic acid by Fenton and modified Fenton treatment." Chemical Engineering Journal 143, no. 1-3 (September 2008): 1–9. http://dx.doi.org/10.1016/j.cej.2008.01.018.

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5

Cross, J. B., R. P. Currier, D. J. Torraco, L. A. Vanderberg, G. L. Wagner, and P. D. Gladen. "Killing of Bacillus Spores by Aqueous Dissolved Oxygen, Ascorbic Acid, and Copper Ions." Applied and Environmental Microbiology 69, no. 4 (April 2003): 2245–52. http://dx.doi.org/10.1128/aem.69.4.2245-2252.2003.

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ABSTRACT An approach to decontamination of biological endospores is discussed. Specifically, the performance of an aqueous modified Fenton reagent is examined. A modified Fenton reagent formulation of cupric chloride, ascorbic acid, and sodium chloride is shown to be an effective sporicide under aerobic conditions. The traditional Fenton reaction involves the conversion of hydrogen peroxide to hydroxyl radical by aqueous ionic catalysts such as the transition metal ions. Our modified Fenton reaction involves the conversion of aqueous dissolved oxygen to hydrogen peroxide by an ionic catalyst (Cu2+) and then subsequent conversion to hydroxyl radicals. Results are given for the modified Fenton reagent deactivating spores of Bacillus globigii. A biocidal mechanism is proposed that is consistent with our experimental results and independently derived information found in the literature. This mechanism requires diffusion of relatively benign species into the interior of the spore, where dissolved O2 is then converted through a series of reactions which ultimately produce hydroxyl radicals that perform the killing action.

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6

Garófalo-Villalta, Soraya, Tanya Medina-Espinosa, Christian Sandoval-Pauker, William Villacis, Valerian Ciobotă, Bisesti Muñoz, and Jentzsch Vargas. "Degradation of Reactive Red 120 dye by a heterogeneous Sono-Fenton process with goethite deposited onto silica and calcite sand." Journal of the Serbian Chemical Society 85, no. 1 (2020): 125–40. http://dx.doi.org/10.2298/jsc190506096g.

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The degradation of Reactive Red 120 dye (RR-120) in synthetic waters was studied. Two processes were considered: homogeneous sono-Fenton with iron(II) sulfate and heterogeneous sono-Fenton with synthetic goethite and goethite deposited onto silica and calcite sand (modified catalysts GS and GC, respectively). In 60 min of reaction, the homogeneous sono-Fenton process allowed a degradation of 98.10 %, in contrast with 96.07 % for the heterogeneous sono-Fenton process with goethite at pH 3.0. The removal of RR-120 increased when the modified catalysts were used instead of bare goethite. Chemical oxygen demand (COD) and total organic carbon (TOC) measurements showed that the highest TOC and COD removals were achieved with the homogeneous sono-Fenton process. Biochemical oxygen demand (BOD5) measurements allowed confirmed that the highest value of BOD5/COD was achieved with a heterogeneous sono-Fenton process (0.88?0.04 with the modified catalyst GC), demonstrating that the biodegradability of the residual organic compounds was remarkably improved.

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7

Koolivand, Ali, Parisa Rastgordani, and Emad Mohammadtalebi. "Investigation on the Efficiency of Modified Fenton on the Treatment of Leachate Generated From Oily Sludge Composting." Journal of Arak University Medical Sciences 24, no. 3 (August 1, 2021): 224–333. http://dx.doi.org/10.32598/jams.24.3.2117.8.

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Background: and Aim The leachate from oil sludge compost into the environment, which is resistant to decomposition, causes several environmental problems. Therefore, it needs to be treated using efficient processes. This study aimed to investigate the efficiency of the modified Fenton process for treating these oil sludge leachates. Methods & Materials: In this experimental study, leachate samples were collected, and then modified Fenton solution was prepared by adding Fe2 (SO4) 3 to H2O2. Then the effect of time parameters (15, 30, 60, 90, and 120 minutes), modified Fenton concentration of 20, 50, 100, and 200 mg/l with pH 3, 5, 9, and three initial concentration of COD (500, 1000 and 1500 mg/l) was examined. Ethical Considerations: This study has been registered in Arak University of Medical Sciences with codes 2645 and 2765. Results: The reduction of COD and TPH in the optimal time of 60 minutes, initial COD of 500 mg/l, pH of 3, and Fenton concentration of 200 mg/l were 9.04 and 77.42%, respectively. The experiments showed that the removal efficiency of COD and TPH with increasing residence time and the concentration of modified Fenton are directly proportional and with decreasing, the initial concentration of COD and pH is inversely proportional. Conclusion: The use of modified Fenton is an efficient method for treating leachate from petroleum sludge compo

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8

Wei, Chao Shuai, Wen Yu Huang, Rui Jie Zhang, Ying Hui Wang, Li Min Luo, Hua Mo, and Long Huan Xiao. "Assessment of the Fe³⁺-EDTA Complex in UV-Fenton-Like Processes: The Degradation of Methylene Blue." Applied Mechanics and Materials 675-677 (October 2014): 395–400. http://dx.doi.org/10.4028/www.scientific.net/amm.675-677.395.

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This study investigated the effect of ultraviolet (UV) enhancement and the Fe3+-EDTA Complex on the degradation of methylene blue (MB) in Fenton-like system. By studying different variables including H2O2concentration, Fe3+-EDTA concentration and pH value，and using MB as a model pollutant, the best experimental conditions was to investigated. Experimental results showed that it is possible to degrade MB wastewater effectively by modified UV-Fenton with Fe3+-EDTA at neutral pH. Besides, optimality condition (pH= 7, [Fe3+-EDTA] = 2 mmol/L, [H2O2] = 10 mmol/L) which were used in the modified UV-Fenton that achieves a removal of over 95% of the MB in 60 min reaction time. Therefore, this new modified Fenton system is an effective treatment for MB wastewater.

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9

Song, Dongbao, Junfeng Li, Weiwei Liu, Zhaoyang Wang, Chun Zhao, Jie Yang, Junhong Tao, and Xiaoya Deng. "Performance of Modified Graphite Felt as Cathode in the Electro-Fenton System." Science of Advanced Materials 12, no. 3 (March 1, 2020): 350–56. http://dx.doi.org/10.1166/sam.2020.3545.

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The graphite felt (GF) was modified by the impregnation method and the potentiostatic oxidation method to improve its application performance in the electro-Fenton (E-Fenton) system. Sulfuric acid and ammonia water were used as modifying reagents. After the GF was modified, its conductivity, adsorption performance and hydrogen peroxide production performance were improved. The original graphite felt (GF0) and the modified GF were used as cathode to degrade methylene blue in the E-Fenton system to explore the practical application performance. The reaction kinetics of the methylene blue degradation process was fitted. The results showed the degradation of methylene blue followed the first-order kinetics. The GF was modified by the potentiostatic oxidation with ammonia as modifying reagent (GFEN) had the best application performance in the E-Fenton system. Degradation of methylene blue for 30 min, the reaction rate constant of GFEN cathode system was 1.71 times higher than GF0 cathode system. The GFEN electrode was reused 10 times in the E-Fenton system, the removal rate of methylene blue was only decreased by 7.14%, and the current was only decreased by 4 mA, which showed its good stability. Finally, the comparison of the electrical energy per order (EE/O) values showed that GFEN can significantly improve the current efficiency of the E-Fenton system.

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10

Zhang, Min Dong, Yan Fei Wei, and Mei Huang. "Treatment of Dye Wastewater by Nano-Ferrous Modified Bentonite Assisted Advanced Oxidation Processes." Advanced Materials Research 486 (March 2012): 104–7. http://dx.doi.org/10.4028/www.scientific.net/amr.486.104.

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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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11

Becelic-Tomin, Milena, Bozo Dalmacija, Ljiljana Rajic, Dragana Tomasevic, Djurdja Kerkez, Malcolm Watson, and Miljana Prica. "Degradation of Anthraquinone Dye Reactive Blue 4 in Pyrite Ash Catalyzed Fenton Reaction." Scientific World Journal 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/234654.

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Pyrite ash (PA) is created by burning pyrite in the chemical production of sulphuric acid. The high concentration of iron oxide, mostly hematite, present in pyrite ash, gives the basis for its application as a source of catalytic iron in a modified Fenton process for anthraquinone dye reactive blue 4 (RB4) degradation. The effect of various operating variables such as catalyst and oxidant concentration, initial pH and RB4 concentration on the abatement of total organic carbon, and dye has been assessed in this study. Here we show that degradation of RB4 in the modified Fenton reaction was efficient under the following conditions:pH=2.5;[PA]0=0.2 g L−1;[H2O2]0=5 mM and initial RB4 concentration up to 100 mg L−1. The pyrite ash Fenton reaction can overcome limitations observed from the classic Fenton reaction, such as the early termination of the Fenton reaction. Metal (Pb, Zn, and Cu) content of the solution after the process suggests that an additional treatment step is necessary to remove the remaining metals from the water. These results provide basic knowledge to better understand the modified, heterogeneous Fenton process and apply the PA Fenton reaction for the treatment of wastewaters which contains anthraquinone dyes.

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12

Kwon, Yong-Jae, Young-Hoon Jo, Jae-Gu Jung, and Sung-Ho Kong. "BTEX-contaminated Groundwater Remediation with Modified Fenton Reaction using Environmental Friendly Chelating Agent." Korean Chemical Engineering Research 52, no. 5 (October 1, 2014): 638–46. http://dx.doi.org/10.9713/kcer.2014.52.5.638.

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13

Huang, Wenyu, Ying Huang, Shuangfei Wang, Hongfei Lin, and Gilles Mailhot. "Degradation of 2,4-Dichlorophenol by Ethylenediamine-N,N′-disuccinic Acid-Modified Photo-Fenton System: Effects of Chemical Compounds Present in Natural Waters." Processes 9, no. 1 (December 25, 2020): 29. http://dx.doi.org/10.3390/pr9010029.

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This paper describes a study of the treatment of 2,4-dichlorophenol (2,4-DCP) with an ethylenediamine-N,N′-disuccinic-acid (EDDS)-modified photo-Fenton system in ultrapure water and different natural waters. The results showed that the EDDS-modified photo-Fenton system is adequate for 2,4-DCP degradation. Compared with a medium containing a single organic pollutant, the removal of pollutants in a more complex medium consisting of two organic compounds is slower by around 25 to 50% as a function of the organic pollutant. Moreover, 2,4-DCP can be further effectively degraded in the presence of organic materials and various inorganic ions. However, the photodegradation of 2,4-DCP in different natural waters, including natural lake water, effluent from domestic sewage treatment plants, and secondary effluent from pulp and paper mill wastewaters, is inhibited. Chemical compounds present in natural waters have different influences on the degradation of 2,4-DCP by adopting the EDDS-modified photo-Fenton system. In any case, the results obtained in this work show that the EDDS-modified photo-Fenton system can effectively degrade pollutants in a natural water body, which makes it a promising technology for treating pollutants in natural water bodies.

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14

Moon, So-Young, Min-Ah Oh, and Jai-Young Lee. "A Study on the Modified Fenton Oxidation of MTBE in Groundwater with Permeable Reactive Barrier using Waste Zero-valent Iron." Journal of Soil and Groundwater Environment 17, no. 2 (April 30, 2012): 15–21. http://dx.doi.org/10.7857/jsge.2012.17.2.015.

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15

Ravi, Srinath, Woo-Seok Kang, Hyung-Kae Lee, You-In Park, Hosik Park, In-Chul Kim, and Young-Nam Kwon. "Improvement in Acid Resistance of Polyimide Membranes: A Sustainable Cross-Linking Approach via Green-Solvent-Based Fenton Reaction." Polymers 15, no. 2 (January 4, 2023): 264. http://dx.doi.org/10.3390/polym15020264.

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In this study, we present a facile surface modification method using green solvents for a commercial polyimide (PI) nanofiltration membrane to exhibit good acid stability. To enhance acid stability, the PI organic solvent nanofiltration membrane was modified using Fenton’s reaction, an oxidative cross-linking process, using environmentally friendly solvents: water and ethanol. The surface properties of the pristine and modified PI membranes were investigated and compared using various analytical tools. We studied the surface morphology using scanning electron microscopy, performed elemental analysis using X-ray photoelectron spectroscopy, investigated chemical bonds using attenuated total reflectance-Fourier transform infrared spectroscopy, and studied thermal stability using thermogravimetric analysis. The acid resistances of the pristine and modified membranes were confirmed through performance tests. The pristine PI nanofiltration membrane exposed to a 50 w/v% sulfuric acid for 4 h showed an increase in the normalized water flux to 205% and a decrease in the MgSO4 normalized rejection to 44%, revealing damage to the membrane. The membrane modified by the Fenton reaction exhibited a decline in flux and improved rejection, which are typical performance changes after surface modification. However, the Fenton-modified membrane exposed to 50 w/v% sulfuric acid for 4 h showed a flux increase of 7% and a rejection increase of 4%, indicating improved acid resistance. Furthermore, the Fenton post-treatment enhanced the thermal stability and organic solvent resistance of the PI membrane. This study shows that the acid resistance of PI membranes can be successfully improved by a novel and facile Fenton reaction using green solvents.

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16

Pereira, M. C., C. M. Tavares, J. D. Fabris, R. M. Lago, E. Murad, and P. S. Criscuolo. "Characterization of a tropical soil and a waste from kaolin mining and their suitability as heterogeneous catalysts for Fenton and Fenton-like reactions." Clay Minerals 42, no. 3 (September 2007): 299–306. http://dx.doi.org/10.1180/claymin.2007.042.3.03.

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AbstractAlternative Fenton and Fenton-like systems based on natural Fe oxides are described. The collected materials were modified through controlled reduction with H2 and were characterized by chemical analysis, X-ray diffraction, saturation magnetization measurements, and Mössbauer spectroscopy at 298 and 110 K. The catalytic activities of these original and modified materials were tested by studying the decomposition of H2O2 and the discolouration of methylene blue. Iron oxides present in the samples were mainly hematite and subordinate goethite which, after controlled reduction, were converted to metallic iron and magnetite. The mixture of Fe0 and magnetite in one of these materials was significantly more efficient at H2O2 decomposition and the discolouration of methylene blue than the original Fe3+ oxides. These results suggest that Fe2+ is essential to produce an active Fenton system.

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17

Koottatep, Thammarat, Saroj Kumar Chapagain, Vo Hoang Nhat Phong Vo, Atitaya Panuvatvanich, Chongrak Polprasert, and Janjit Iamchaturapatr. "Modified Soil Compositions for Removal of Acetaminophen from Wastewater." Key Engineering Materials 751 (August 2017): 677–82. http://dx.doi.org/10.4028/www.scientific.net/kem.751.677.

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ACT is a widely used prescriptive drug for analgesic treatment. Due to incomplete conversion of ACT in the body, a significant portion of it is released with human excreta. Most wastewater treatment plants lack the efficiency to treat influent containing ACT residues. As a result, risk of surface and groundwater contamination has been increased. Constructed wetlands (CWs) are one of the widely used natural wastewater treatment technologies, employing soil-plant interactions in treating pollutants through a number of reactions such as plant uptake, ion adsorption and advanced Fenton reaction. In addition, the wetland plants are well-known to generate H2O2 in the surrounding rhizosphere for advanced oxidation process. In this study, the potential of laterite soil in initiating Fenton reactions by its abundant composition of iron (Fe) and its modified structure with activated carbon, cement and crushed shellfish (modified soil) were evaluated for ACT treatment. The induced H2O2 soil environment in the constructed wetland units could remove almost 80% of the ACT present initially. The results showed good occurrence of Fenton process on both natural laterite soil and modified media bed (cement: laterite soil fine: 50% laterite soil coarse: 50% activated carbon).

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18

Krishnan, Sukanya, Carlos A. Martínez-Huitle, and P. V. Nidheesh. "An overview of chelate modified electro-Fenton processes." Journal of Environmental Chemical Engineering 10, no. 2 (April 2022): 107183. http://dx.doi.org/10.1016/j.jece.2022.107183.

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19

Inchaurrondo, N., C. P. Ramos, G. Žerjav, J. Font, A. Pintar, and P. Haure. "Modified diatomites for Fenton-like oxidation of phenol." Microporous and Mesoporous Materials 239 (February 2017): 396–408. http://dx.doi.org/10.1016/j.micromeso.2016.10.026.

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20

Moussavi, Mohsen, and Sina Matavos-Aramyan. "Chelate-modified fenton treatment of sulfidic spent caustic." Korean Journal of Chemical Engineering 33, no. 8 (May 24, 2016): 2384–91. http://dx.doi.org/10.1007/s11814-016-0080-z.

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21

Lee, Youngmin, Sungjun Bae, and Woojin Lee. "Degradation of carbon tetrachloride in modified Fenton reaction." Korean Journal of Chemical Engineering 29, no. 6 (January 30, 2012): 769–74. http://dx.doi.org/10.1007/s11814-011-0261-8.

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22

Zhu, Yun-Pei, Tie-Zhen Ren, and Zhong-Yong Yuan. "Hollow cobalt phosphonate spherical hybrid as high-efficiency Fenton catalyst." Nanoscale 6, no. 19 (2014): 11395–402. http://dx.doi.org/10.1039/c4nr02679a.

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23

Tryba, B., P. Brożek, M. Piszcz, and A. Morawski. "New photocatalyst for decomposition of humic acids in photocatalysis and photo-Fenton processes." Polish Journal of Chemical Technology 13, no. 4 (January 1, 2011): 8–14. http://dx.doi.org/10.2478/v10026-011-0042-5.

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New photocatalyst for decomposition of humic acids in photocatalysis and photo-Fenton processes Humic acid Leonardite IHSS standard was decomposed on TiO2 and TiO2 modified by FeC2O4 via the photocatalysis and photo-Fenton processes under UV irradiation. Humic acid (HA) were favorable adsorbed on TiO2 surface and followed decomposition during UV irradiation faster on TiO2 than on the modified samples. However, when H2O2 was added to the solution, the photo-Fenton process occurred on the prepared TiO2 samples, contained iron together with photocatalysis and high acceleration of HA decomposition was observed. In this case the mineralization degree was much higher than in the applied photocatalysis only, around 75% HA (with concentration of 18 mg/L) was mineralized after 3 h of adsorption and 5 h of UV irradiation in the presence of H2O2 and modified TiO2 whereas on TiO2 mineralisation of HA occurred in around 45% only. The measured fluorescence spectra of HA solutions showed that in the presence of H2O2 polycyclic aromatics were rapidly oxidized to the lower size products such as alcohols, aldehydes, ketones and carboxylic acids, what accelerated the process of HA decomposition.

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24

Zhang, Xuhong, Yanzhuo Chen, Ning Zhao, Hui Liu, and Yu Wei. "Citrate modified ferrihydrite microstructures: facile synthesis, strong adsorption and excellent Fenton-like catalytic properties." RSC Adv. 4, no. 41 (2014): 21575–83. http://dx.doi.org/10.1039/c4ra00978a.

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25

Wang, Nannan, Qiang Zhao, and Aili Zhang. "Catalytic oxidation of organic pollutants in wastewater via a Fenton-like process under the catalysis of HNO3-modified coal fly ash." RSC Advances 7, no. 44 (2017): 27619–28. http://dx.doi.org/10.1039/c7ra04451h.

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26

Wang, Nannan, Jiaqing Chen, Qiang Zhao, and Han Xu. "Study on preparation conditions of coal fly ash catalyst and catalytic mechanism in a heterogeneous Fenton-like process." RSC Advances 7, no. 83 (2017): 52524–32. http://dx.doi.org/10.1039/c7ra09925h.

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27

Chakinala, A. G., D. H. Bremner, A. E. Burgess, and K. C. Namkung. "A modified advanced Fenton process for industrial wastewater treatment." Water Science and Technology 55, no. 12 (June 1, 2007): 59–65. http://dx.doi.org/10.2166/wst.2007.390.

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For the first time hydrodynamic cavitation induced by a liquid whistle reactor (LWR) has been used in conjunction with the advanced Fenton process (AFP) for the treatment of industrial wastewater. Semi-batch experiments in the LWR were designed to investigate the performance of the process by optimising various parameters such as pressure, pH, H2O2 concentration and the concentration of industrial wastewater samples on the mineralisation of the total organic carbon (TOC). It was found that higher pressures are more favourable for a rapid TOC mineralisation.

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28

Northup, Abraham, and Daniel Cassidy. "Calcium peroxide (CaO2) for use in modified Fenton chemistry." Journal of Hazardous Materials 152, no. 3 (April 2008): 1164–70. http://dx.doi.org/10.1016/j.jhazmat.2007.07.096.

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29

Li, Zehui, Yuheng Jiang, Chenming Liu, Zhuoya Wang, Zhiqin Cao, Yi Yuan, Mingjie Li, et al. "Emerging investigator series: dispersed transition metals on a nitrogen-doped carbon nanoframework for environmental hydrogen peroxide detection." Environmental Science: Nano 5, no. 8 (2018): 1834–43. http://dx.doi.org/10.1039/c8en00498f.

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30

Dao, Duc Sy, and Ninh The Vu. "Degradation of reactive blue 182 dye by heterogeneous Fenton reaction using modified fly ash/H2O2." Science and Technology Development Journal 16, no. 3 (September 30, 2013): 13–21. http://dx.doi.org/10.32508/stdj.v16i3.1634.

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In this paper, Fe3+ was immobilized in fly ash using a thermal procedure. Fe3+- modified fly ash was used as heterogeneous Fenton catalyst for the degradation of Reactive Blue 182 (RB 182). Some properties of raw and modified fly ashes were characterized by SEM, EDX and XRD techniques. Effects of some key operating parameters such as catalyst dose, pH, and hydrogen peroxide concentration on the treatment efficiency were studied and discussed. Kinetic rate constant of treatment process was also determined. The experimental results show that the heterogeneous Fenton technique using modified fly ash/H2O2 is a suitable method for removing RB 182 from aqueous solution. At the optimum conditions includes catalyst dose of 1 g/l; hydrogen peroxide of 3,92 mM; pH 3; contact time for 90 minutes; approximately 90% of RB 182 was removed; the kinetics fitted well for pseudo first-order reaction.

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31

Ferreira, Marta, Nihat E. Sahin, António M. Fonseca, Pier Parpot, and Isabel C. Neves. "Oxidation of pollutants via an electro-Fenton-like process in aqueous media using iron–zeolite modified electrodes." New Journal of Chemistry 45, no. 28 (2021): 12750–57. http://dx.doi.org/10.1039/d1nj01077h.

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32

Chu, C. L., T. Hu, S. L. Wu, Y. P. Pu, C. Y. Chung, K. W. K. Yeung, and Paul K. Chu. "Effects of Electro-Fenton Process on Blood Compatibility and Nickel Suppression of NiTi Shape Memory Alloy." Advanced Materials Research 47-50 (June 2008): 314–17. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.314.

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Electro-Fenton process as a modified Fenton’s oxidation method in waster water treatment can provide a stable hydroxyl radical (·OH) source by continuous reaction of electrochemically generated H2O2 with Fe2+ ions for surface oxidation modification of NiTi shape memory alloy (SMA). In this work, effects of electro-Fenton process on blood compatibility and nickel suppression of NiTi SMA were investigated by SEM and XPS, inductively-coupled plasma mass spectrometry (ICPMS), hemolysis analysis and blood platelet adhesion test. It is found that electro-Fenton process is a notably effective way to impede out-diffusion of Ni from NiTi SMA in simulated body fluids during the entire ten week immersion period. It can also improve the hemolysis resistance and thromboresistance of biomedical NiTi SMA. The improvement of blood compatibility and nickel suppression of NiTi SMA can be attributed to the formation of surface titania film with a Ni-free zone near its top surface by electro-Fenton process.

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33

Hosseinpourpia, Reza, and Carsten Mai. "Mode of action of brown rot decay resistance in phenol-formaldehyde-modified wood: resistance to Fenton’s reagent." Holzforschung 70, no. 3 (March 1, 2016): 253–59. http://dx.doi.org/10.1515/hf-2015-0045.

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Abstract The mode of action of phenol-formaldehyde (PF)-modified wood has been investigated with respect to its resistance to brown rot decay. The Fenton reaction is assumed to play a key role in the initial brown rot decay. Pine microveneers were modified to various weight percent gains (WPG) with low molecular weight PF and exposed to a solution containing Fenton’s reagent. The mass loss (ML) and tensile strength loss (TSL) as well as the decomposition of hydrogen peroxide within the incubation time decreased with the increasing WPG of the veneers. Incubation of untreated and PF-modified veneers in acetate buffer containing ferric ions without H2O2 revealed that the modification strongly reduces the uptake of iron by the wood cell wall. Further studies indicated that lignin promotes the decay of wood by Fenton’s reagent. The reason for the enhanced resistance of modified wood to the Fenton reaction is attributable to the impeded diffusion of iron ions into the cell wall rather than to the blocking of free phenolic sites of lignin, which accelerate redox cycling of iron.

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34

Wang, Yi-Ta, Chang-Hung Tu, and Yue-Sheng Lin. "Application of Graphene and Carbon Nanotubes on Carbon Felt Electrodes for the Electro-Fenton System." Materials 12, no. 10 (May 25, 2019): 1698. http://dx.doi.org/10.3390/ma12101698.

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The electro-Fenton system has the ability to degrade wastewater and has received attention from many researchers. Currently, the core development objective is to effectively increase the degraded wastewater decolorization efficiency in the system. In this study, to improve the electro-Fenton system reaction rate and overall electrical properties, we used polyvinylidene difluoride to fix carbon nanotubes (CNTs) and graphene onto the system cathode (carbon felt electrode), which was then used to process Reactive Black 5 wastewater. Furthermore, we (1) used scanning electron microscopy to observe the structural changes in the electrode surface after modification; (2) used the Tafel curve to determine the electrode corrosion voltage and corrosion rate; and (3) analyzed the azo-dye decolorization level. The results showed that the maximum system decolorization rates of the CNT- and graphene-modified carbon felt electrodes were 55.3% and 70.1%, respectively. These rates were, respectively, 1.2 and 1.5 times higher than that of the unmodified carbon felt electrode, implying that we successfully improved the cathode characteristics. The modified electrode exhibited an improved conductivity and corrosion resistance, which, in turn, improved the system decolorization efficiency. This significantly increased the electro-Fenton system overall efficacy, making it valuable for future applications.

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35

Bañuelos, Jennifer A., O. García-Rodríguez, Francisco J. Rodríguez-Valadez, and Luis A. Godínez. "Electrochemically Prepared Iron-Modified Activated Carbon Electrodes for Their Application in Electro-Fenton and Photoelectro-Fenton Processes." Journal of The Electrochemical Society 162, no. 9 (2015): E154—E159. http://dx.doi.org/10.1149/2.0581509jes.

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36

Hasibuan, Muhamad Abduh, Didik Setiyo Widodo, and Retno Ariadi Lusiana. "Decolorization of Remazol Black B Solution by PbO2 Modified Fenton Method in a Scaled Up Reactor." Jurnal Kimia Sains dan Aplikasi 21, no. 2 (April 30, 2018): 59–63. http://dx.doi.org/10.14710/jksa.21.2.59-63.

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Study on decolourization of remazol black B (RBB) solution has been performed in a scale up reactor. As an artificial waste, the dye sample that contains azo groups is difficult to decompose under ordinary environmental conditions so it requires further treatment before discharging to open aquatic system. Many efforts have been reported and further developed toward other azo dyes. One of an outstanding approach is Fenton method. This study modified the method with PbO2 rather than Fe2+. In this modification, the dyestuff was degraded by radical •OH resulting from reaction between H2O2 and Pb2+ ion generated from PbO2. In Preliminary works, decolourization was performed and optimized in lab-scaled. Analysis were conducted and the best condition was applied to decolorize the sample in a scale-up size. Characteristics of the reactor was also determined. Results showed that at optimum condition, 100 mL of 50 ppm remazol black B was decolorized up to 98.82 % within 15 minutes. On scale up to 1 L-sized reactor, within the time highest percentages of remazol black B decolourization was reached 82.02 % by addition of 10 % H2O2 and COD decrease to 98.96 %. In the 1 L reactor, RBB sample with concentration of 50 ppm, PbO2 1 gram and H2O2 10 % obey the proposed decolourization equation of D = -0,0011x2 + 0.5705x – 0.6788 with x = volume peroxide (in mL), D = percent of decolourization.

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37

Beker, Sabrina A., Leadin S. Khudur, Ivan Cole, and Andrew S. Ball. "Catalytic degradation of methylene blue using iron and nitrogen-containing carbon dots as Fenton-like catalysts." New Journal of Chemistry 46, no. 1 (2022): 263–75. http://dx.doi.org/10.1039/d1nj04761b.

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Carbon dots were modified with iron and nitrogen groups to produce specific surface groups and charge which demonstrated high efficiency for the Fenton-like degradation of methylene blue whilst markedly minimising its effluent toxicity.

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38

Rodríguez, Mallerliny Quintero, Jaiver Osorio Grisales, Henry Reyes Pineda, and Jhon Rodríguez Espinosa. "Degradation of Dyes in Real Textile Industry Wastewater Samples by Fenton Process." Journal of Hunan University Natural Sciences 49, no. 6 (June 30, 2022): 151–66. http://dx.doi.org/10.55463/issn.1674-2974.49.6.16.

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This research proposes a solution to the problem of industrial safety and the improvement of environmental processes in the textile industry through the degradation of dyes from its processes using the Fenton reaction. This advanced oxidation technology makes it possible to reduce the possible environmental impacts caused by the organic matter generated in industrial activity. Sampling was conducted under real operating conditions in the homogenization tank of the Industrias Printex SAS wastewater treatment plant. Advanced oxidation was carried out applying the Fenton process using iron from ferrous sulfate heptahydrate as a catalyst and hydrogen peroxide at different concentrations in a 6-post flocculator. Among the results obtained, an optimal dose of 571 ppm of iron and 38 ppm of hydrogen peroxide was found through statistical analysis with the STATGRAPHICS program using the 2k factorial design and constructing response surfaces. A comparative study between the Fenton treatments, treatment with hydrogen peroxide, and treatment with ferrous sulfate heptahydrate showed the Fenton reaction at neutral pH, attributed to the presence of some organic acids such as citric acid, used as a chelating agent (Fenton modified). The proposed treatment was compared with the one that uses chlorine, applying it in three (3) different tanks through a multifactorial ANOVA with the data collected when scaling the treatment, finding that the proposed Fenton treatment is more efficient. This research was innovative because it demonstrated the feasibility of scaling up the Fenton process to neutral pH in a textile wastewater treatment plant, reducing operating costs and minimizing environmental impact.

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39

Li, Qun, Aijiao Wang, Keying Long, Zhibin He, and Ruitao Cha. "Modified Fenton Oxidation of Cellulose Fibers for Cellulose Nanofibrils Preparation." ACS Sustainable Chemistry & Engineering 7, no. 1 (November 19, 2018): 1129–36. http://dx.doi.org/10.1021/acssuschemeng.8b04786.

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40

Turan-Ertas, Tuba, and Mirat D. Gurol. "Oxidation of diethylene glycol with ozone and modified Fenton processes." Chemosphere 47, no. 3 (April 2002): 293–301. http://dx.doi.org/10.1016/s0045-6535(01)00312-5.

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41

Büyüksönmez, Fatïh, Thomas F. Hess, Ronald L. Crawford, and Richard J. Watts. "Toxic Effects of Modified Fenton Reactions on Xanthobacter flavus FB71." Applied and Environmental Microbiology 64, no. 10 (October 1, 1998): 3759–64. http://dx.doi.org/10.1128/aem.64.10.3759-3764.1998.

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ABSTRACT The toxic effects of modified Fenton reactions onXanthobacter flavus FB71, measured as microbial survival rates, were determined as part of an investigation of simultaneous abiotic and biotic oxidations of xenobiotic chemicals. A central composite, rotatable experimental design was developed to study the survival rates of X. flavus under various concentrations of hydrogen peroxide and iron(II) and at different initial cell populations. A model based on the experimental results, relating microorganism survival to the variables of peroxide, iron, and cellular concentrations was formulated and fit the data reasonably well, with a coefficient of determination of 0.76. The results of this study indicate that the use of simultaneous abiotic and biotic processes for the treatment of xenobiotic compounds may be possible.

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42

Yehia, Fatma Z., Nadia G. Kandile, Abdelfatah M. Badawi, and Amr H. Mady. "Glutamic Acid Modified Fenton System for Degradation of BTEX Contamination." CLEAN - Soil, Air, Water 40, no. 7 (April 25, 2012): 692–97. http://dx.doi.org/10.1002/clen.201000042.

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43

Co, Thanh Thien, Dinh Khoi Le, Van De Le, and Thi Nhu Thuy Doan. "Preparation of Heterogeneous Fenton-Type Nano Catalysts and Their Application to Methylene Blue Degradation." Science and Technology Development Journal 23, no. 4 (December 2, 2020): 764–70. http://dx.doi.org/10.32508/stdj.v23i4.2451.

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Introduction: Iron-based nanocatalysts are known as a new generation heterogeneous Fenton catalyst, replacing the traditional Fenton catalyst system which has many disadvantages in experimental processes and industrial applications. In this study, we focused on the preparation of iron nanoparticles and their use when embedded in traditional supports, as well as tested their catalytic activity by modified Fenton-type oxidation of methylene blue (MB) substrate. Method: Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD) and UV-vis were used for physio-chemical characterization of the catalysts. Results: Iron nanoparticles were obtained in the reduction of iron salt by sodium borohydride (NaBH4), with particle size in the range of 4-5 nm. Fe-X (X represents C, Bentonite, Al2O3, or ZnO) was synthesized in high yield and applied to the Fenton oxidation of MB; approximately 99% conversion was observed in the case of Fe-C. Conclusion: Supported iron nanoparticles are active catalysts for the oxidation of MB; however, there are limitations if pH is above 3.

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Checa-Fernandez, Alicia, Aurora Santos, Arturo Romero, and Carmen M. Dominguez. "Application of Chelating Agents to Enhance Fenton Process in Soil Remediation: A Review." Catalysts 11, no. 6 (June 10, 2021): 722. http://dx.doi.org/10.3390/catal11060722.

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Persistent organic contaminants affecting soil and groundwater pose a significant threat to ecosystems and human health. Fenton oxidation is an efficient treatment for removing these pollutants in the aqueous phase at acidic pH. However, the in-situ application of this technology for soil remediation (where pHs around neutrality are required) presents important limitations, such as catalyst (iron) availability and oxidant (H2O2) stability. The addition of chelating agents (CAs), forming complexes with Fe and enabling Fenton reactions under these conditions, so-called chelate-modified Fenton process (MF), tries to overcome the challenges identified in conventional Fenton. Despite the growing interest in this technology, there is not yet a critical review compiling the information needed for its real application. The advantages and drawbacks of MF must be clarified, and the recent achievements should be shared with the scientific community. This review provides a general overview of the application of CAs to enhance the Fenton process for the remediation of soils polluted with the most common organic contaminants, especially for a deep understanding of the activation mechanisms and influential factors. The existing shortcomings and research needs have been highlighted. Finally, future research perspectives on the use of CAs in MF and recommendations have been provided.

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45

Kida, Ziembowicz, and Koszelnik. "Impact of a Modified Fenton Process on the Degradation of a Component Leached from Microplastics in Bottom Sediments." Catalysts 9, no. 11 (November 7, 2019): 932. http://dx.doi.org/10.3390/catal9110932.

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This paper describes work to assess the possibility of a modified Fenton process being used to remove the hard-to-degrade plasticizer di(2-ethylhexyl) phthalate (DEHP) from the bottom sediments of a reservoir. The modifications in question entail iron(II) ions being replaced by iron(III), as well as facilitation of the process using a chelating agent. Analysis further revolved around the impact of such factors as amounts of reagents, reaction of the environment, initial contents of the contaminant, and the presence of other “competing” contaminants also of a hard-to-decompose nature. As the maximum efficiency of DEHP removal obtained did not exceed 30%, the low susceptibility to degradation is made clear, as is the need for earlier desorption of the contaminant from the matrix. The effect of the modified Fenton process on the content of organic matter and dissolved organic carbon was also considered, as was the tendency to cause selected metals and plant nutrients to leach from bottom sediments.

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46

Kida, Małgorzata, Sabina Ziembowicz, and Piotr Koszelnik. "The Use of an Ultrasonic Field in Support of Classical Methods of Oxidising Component Leached from Microplastics in Bottom Sediments." Materials 14, no. 11 (June 2, 2021): 3029. http://dx.doi.org/10.3390/ma14113029.

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The work detailed here examined the impact of selected unit methods and ultrasonic removal of the widespread plastic additive di(2-ethylhexyl) phthalate (DEHP) from the bottom sediments of a body of water. To this end, hydrogen peroxide and a classic or modified Fenton process were used, supplemented by an ultrasonic field. The latter had a vibration frequency of 20 kHz and an acoustic wave intensity of 3.97 W/cm2. The impact of process parameters such as reaction environment, reaction time, initial impurity content, aging of the impurity, influence of processes on the content of organic matter and dissolved organic carbon, and elution of selected components from the matrix were all analysed. It emerged that the most effective process by which to remove DEHP from a solid matrix involved a modified Fenton process assisted by an ultrasonic field. The highest average degradation efficiency achieved in this way was 70.74%, for C0 = 10 mg/kg d.w. and t = 60 min.

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47

Yu, Tian, and Carmel B. Breslin. "Graphene-Modified Composites and Electrodes and Their Potential Applications in the Electro-Fenton Process." Materials 13, no. 10 (May 14, 2020): 2254. http://dx.doi.org/10.3390/ma13102254.

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In recent years, graphene-based materials have been identified as an emerging and promising new material in electro-Fenton, with the potential to form highly efficient metal-free catalysts that can be employed in the removal of contaminants from water, conserving precious water resources. In this review, the recent applications of graphene-based materials in electro-Fenton are described and discussed. Initially, homogenous and heterogenous electro-Fenton methods are briefly introduced, highlighting the importance of the generation of H2O2 from the two-electron reduction of dissolved oxygen and its catalysed decomposition to produce reactive and oxidising hydroxy radicals. Next, the promising applications of graphene-based electrodes in promoting this two-electron oxygen reduction reaction are considered and this is followed by an account of the various graphene-based materials that have been used successfully to give highly efficient graphene-based cathodes in electro-Fenton. In particular, graphene-based composites that have been combined with other carbonaceous materials, doped with nitrogen, formed as highly porous aerogels, three-dimensional materials and porous gas diffusion electrodes, used as supports for iron oxides and functionalised with ferrocene and employed in the more effective heterogeneous electro-Fenton, are all reviewed. It is perfectly clear that graphene-based materials have the potential to degrade and mineralise dyes, pharmaceutical compounds, antibiotics, phenolic compounds and show tremendous potential in electro-Fenton and other advanced oxidation processes.

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Jia, Xiao Feng, Wen Ning Mai, Xiao Rui Wang, and Jun Zhou. "Advanced Treatment on Papermaking Wastewater Using Photo-Fenton Modified Fly Ash." Applied Mechanics and Materials 535 (February 2014): 230–36. http://dx.doi.org/10.4028/www.scientific.net/amm.535.230.

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There are still some recalcitrant and toxic substances contained in the papermaking wastewater after the biological treatment, so it is necessary to conduct advanced treatment. This paper designed the types and modified methods of fly ash, and then utilized the orthogonal test and single factor analysis to determine the influence of various factors and the combination of optimal levels of Photo-Fenton method of modified fly ash. The results show that the acid modified fly ash has great synergistic catalytic effect. The optimal reaction conditions of papermaking wastewater treatment using the method without adjusting the pH value of raw water are shown as follows: the dosage of fly ash is 34g/L, the dosage of H2O2 is 8.2mmol/L, the dosage of FeSO4·7H2O is 8.8mmol/L and the reaction time is controlled in 45min.In this case, the removal efficiency for COD can reach 71.72%.

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49

Pan, Xingyu, Xiaokun Fan, Aiping Liang, Siqi Zhang, Wenhui Wang, Songying Qu, and Chaolin Li. "Electron-rich CNTs modified FeOCl/Fe2O3 with improved Fenton catalytic performance." Composites Communications 27 (October 2021): 100811. http://dx.doi.org/10.1016/j.coco.2021.100811.

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50

Wang, Jing, Hao Jie Li, Qian Kun Cheng, Xiao Tong Yan, Ai Qing Cao, and Qing You Tan. "Treatment of Phenol WasteWater with Modified Coal Fly Ash-Fenton Reagent." Advanced Materials Research 955-959 (June 2014): 623–27. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.623.

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Autonomous coal fly ash modified by vitriol (H2SO4) was used to treat Phenol Waste Water. The treatment influences were determined by single-factor experiment and the prioritizing importance and optimizing combination of the influences were studied using orthogonal experiment. We found that the prioritizing importance of the influencing factors was as follow: dosage of ferrous sulfate (FeSO4) > dosage of hydrogen peroxide (H2O2) > initial concentration of phenol > PH > the dosage of modified coal fly ash. The optimizing combination of the influences was 5 wt.% FeSO4, 1 mL ; 3 wt.%H2O2, 7 mL; PH=5; initial concentration of phenol , 300 mg/L and the dosage of modified coal fly ash, 200 mg/L. Under the condition above, phenol removal rate was 99.46%.

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