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Статті в журналах з теми "Photo-Fenton-like"
Miller, Christopher J., Susan Wadley, and T. David Waite. "Fenton, photo-Fenton and Fenton-like processes." Water Intelligence Online 16 (May 15, 2017): 297–332. http://dx.doi.org/10.2166/9781780407197_0297.
Повний текст джерелаDugandzic, Ana, Andjelka Tomasevic, Dunja Dabic, Natasa Sekuljica, Marina Radisic, Slobodan Petrovic, and Dusan Mijin. "Degradation of nicosulfuron using fenton and fenton-like reactions." Chemical Industry and Chemical Engineering Quarterly 24, no. 3 (2018): 201–8. http://dx.doi.org/10.2298/ciceq170617032d.
Повний текст джерелаWu, C. H., J. T. Wu, and Y. H. Lin. "Mineralization of sulfamethizole in photo-Fenton and photo-Fenton-like systems." Water Science and Technology 73, no. 4 (October 27, 2015): 746–50. http://dx.doi.org/10.2166/wst.2015.554.
Повний текст джерелаArslan-Alaton, I., and F. Gurses. "Photo-Fenton-like and photo-fenton-like oxidation of Procaine Penicillin G formulation effluent." Journal of Photochemistry and Photobiology A: Chemistry 165, no. 1-3 (July 2004): 165–75. http://dx.doi.org/10.1016/j.jphotochem.2004.03.016.
Повний текст джерелаFassi, S., K. Djebbar, I. Bousnoubra, H. Chenini, and 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, no. 25-27 (June 26, 2013): 4982–89. http://dx.doi.org/10.1080/19443994.2013.809971.
Повний текст джерелаRehman, Faiza, Murtaza Sayed, Javed Ali Khan, Luqman Ali Shah, Noor S. Shah, Hasan M. Khan, and Rozina Khattak. "Degradation of Crystal Violet Dye by Fenton and Photo-Fenton Oxidation Processes." Zeitschrift für Physikalische Chemie 232, no. 12 (November 27, 2018): 1771–86. http://dx.doi.org/10.1515/zpch-2017-1099.
Повний текст джерелаKuo, C. Y., C. Y. Pai, C. H. Wu, and 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, no. 11 (June 1, 2012): 1970–74. http://dx.doi.org/10.2166/wst.2012.095.
Повний текст джерелаOlmez-Hanci, Tugba, Idil Arslan-Alaton, and Ozlem Gelegen. "Photo-Fenton-like treatment of K-acid: assessment of treatability, toxicity and oxidation products." Water Science and Technology 70, no. 6 (July 30, 2014): 1056–64. http://dx.doi.org/10.2166/wst.2014.330.
Повний текст джерелаKuo, Chao-Yin, and Chueh-Ying Pai. "Application of cuprous oxide synthesized from copper-containing waste liquid to treat aqueous reactive dye." Water Science and Technology 65, no. 9 (May 1, 2012): 1557–63. http://dx.doi.org/10.2166/wst.2012.047.
Повний текст джерелаGuo, Li, Kailai Zhang, Xuanxuan Han, Qiang Zhao, Danjun Wang, and Feng Fu. "2D In-Plane CuS/Bi2WO6 p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance." Nanomaterials 9, no. 8 (August 11, 2019): 1151. http://dx.doi.org/10.3390/nano9081151.
Повний текст джерелаДисертації з теми "Photo-Fenton-like"
Cruz, Gonzalo Angel. "Synthesis and performance of heterogeneous catalysts for Fenton-like and photo-Fenton-like reactions at circumneutral pH." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/404350.
Повний текст джерелаLos procesos Fenton y foto-Fenton son procesos de oxidación avanzada (POA) que se basan en la descomposición del peróxido de hidrógeno catalizada por sales de hierro (II), produciendo radicales hidroxilo que son altamente oxidantes. El segundo además incorpora la irradiación con luz ultravioleta en el rango A, cosa que permite acelerar el proceso debido a la recuperación del hierro (II), que durante la reacción principal pasa a hierro (III). Estos procesos se suelen llevar a cabo a pH ácido (pH<3) debido a la baja solubilidad y la poca actividad de las especies de hierro a pH cercanos a la neutralidad. Este trabajo se centra en el estudio y aplicación de un catalizador heterogéneo de Fe/alginato formado gracias a la propiedad del alginato de formar geles sólidos en presencia de cationes di y trivalentes. En este caso, el Fe(III) actúan como enlace entre cadenas de alginato. Inicialmente se estudió el proceso de fabricación de este catalizador y se propuso un proceso estándar optimizado para su uso aplicado a la reacción foto-Fenton. Posteriormente se evaluó su aplicación a la eliminación del antibiótico sulfametoxazol y a la desinfección de bacterias Escherichia Coli. Basándose en los resultados obtenidos se propuso un mecanismo de reacción que además explicaba la inestabilidad observada experimentalmente que producía la liberación de hierro dependiendo del pH del medio de reacción, lo que desencadenaba la vía de reacción homogénea. Con la intención de mejorar la estabilidad del catalizador, se modificó el proceso de síntesis añadiendo una etapa de deshidratación controlada al final del proceso. Los resultados en su prueba para la reacción foto-Fenton aplicada a la eliminación de sulfametoxazol mostraron que el rendimiento no empeoraba pero mejoraba significativamente su estabilidad. Para aumentar su eficiencia se probó incorporar cerio, partículas de hierro monovalente y TiO2. Los resultados mostraron que solo el catalizador modificado con TiO2 mejoraba el rendimiento global de la reacción. Por último, se probaron otros catalizadores heterogéneos (piedras volcánicas, Fe/Ce/O, Fe/Mn/O, limaduras de hierro) aplicados a la reacción foto-Fenton. Solo las piedras volcánicas mostraron actividad catalítica y ésta, en comparación con la del catalizador de alginato fue baja.
De, Luca Antonella. "Fenton and Photo-Fenton like at neutral pH for the removal of emerging contaminants in water and wastewater effluents." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/399786.
Повний текст джерелаJasmina, Anojčić. "Voltametrijske metode zasnovane na primeni jednostavnih i savremenih elektroda/senzora na bazi ugljeničnih materijala za određivanje vodonik-peroksida u odabranim uzorcima." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107685&source=NDLTD&language=en.
Повний текст джерелаnull
The aim of this doctoral dissertation was the development of fast and reliable voltammetric methods based on the application of simple and contemporary electrodes/sensors based on carbonaceous materials (carbon paste made of graphite powder and paraffin oil and screen printed carbon electrodes) for the determination of H 2 O2 in the selected complex model and real samples.For this purpose, applicability of different working electrodes was investigated.The amperometric method based on carbon paste electrode (CPE) bulk- modified with 5% (m:m) MnO 2 , under optimized conditions, with a working potential of 0.40 V vs. the saturated calomel elect rode (SCE) and a phosphate buffer solution (pH 7.50) as supporting electrolyte, enabled the quantitation of H 2 O2in the concentration interval from 1.4 to 65 µg mL −1 with a relative standard deviation (RSD) of less than 10%. This meth od was applied for the determination of the H 2 O2 consumption in samples of groundwater fro m the Central Banat region (Province of Vojvodina, Serbia) treated by the Fenton (Fe 2+ and H 2O2 ) and Fenton- like (Fe 3+and H 2O2 ) reagents to remove natural organic matter (NOM) at differentinitial concentrations of iron species, and of their molar ratios to the initial concentration of H2O2 . It was found that the form of Fe (Fe 2+ or Fe 3+ )and the molar ratio to H 2O2influenced the degree of the H 2O2 decomposition in the groundwater with high NOM content. Besides, in the case of the Fenton-like process, for all initial doses of Fe 3+ and H 2 O2, a sign ificant amount of H 2 O2 remained unused, whi ch also indicates a lower efficiency of such system compared to the Fenton process. Screen printed carbon electrode (SPCE) bulk-modified with MnO 2 as a mediator was applied for amperometric determination of the H 2 O2 content during the Fenton (Fe 2+ , H 2 O2 ) and visible light-assisted , photo-Fenton (Fe 2+ , H 2 O2 , hν) based removal of neonicotinoid insecticide acetamiprid (ACT). Under optimized conditions (working potential of 0.40 V vs. SCE, phosphate buffer pH 7.50 as supporting electrolyte) amperometric determination of H 2 O2 showed a linear dynamic range from 0.01 to 1.24 mmol L -1 (from 0.34 to 42.2 µg mL -1) and the RSD did not exceed 4.2%. In the investigated samples (after appropriate pH adjustment from 2.8 to 7.5 instantly after the sampling to stop or maximum decelerate the oxidation processes, filtering, and storage of the deep- frozen sample with defrosting immediately before the measurements) the H 2 O2 contents were determined by the standard addition method by analyzing the corresponding amperometric curves. Parallel HPLC-DAD measurements were performed to monito r the concentration/removal of ACT. In the case of the photo- Fenton process (initial concentrations: 0.31; 2.0 and 3.0 mmol L -1 (70.0; 111.7 and 102.1 µg mL -1 ) of ACT, Fe 2+ and H 2 O2, respec tively) after 10 min of irradiation H 2 O2 was consumed and it can be consi dered that ACT was removed after 5 min. During the Fenton process ACT was removed after 20 min of treatment and around 10% of the initial concentration of the H 2O2 remained still unused.CPE was surface modified with a composite of Pt nanoparticles (< 5 nm) on graphitized carbon (Pt-C, 10% Pt on Vulcan XC72) by simply dropcoating method. The unmodified CPE and the modified one (Pt-C/CPE) were characterized by EM/EDS and CV measurements. The PtC/CPE showed remarkable electrocatalytic propertiestoward the electrochemical redox reaction of H 2 O2 compared to modified CPE in phosphate buffer (0.1 mol L -1 ; pH 7.50), as well in acetatebuffer (0.1 mol L -1 ; pH .50) supporting electrolytes. Amperometry of H2O2 in the concentration range from 0.15 to 1.45 µg mL -1 with the Pt-C/CPE showed acceptable linearity, while the obtained values of LOQs were 0.06 µg mL -1 (pH 7.50, working potential 0.20 V) and 0.10 µg mL -1 (pH 4 .50, working potential 0.50 V). The proposed analytical methods were applied to the determination of the H 2O2 content in commercially available personal care products; i.e., disinfection (pH 7.50) and contact lens cleaning solutions (pH 4.50). The obtained amperometric results are in good agreement with those measured by traditional titanium sulfatereagent based spectrophotometric method with determined concentrations as 2.91% and 2.94% for the disinfection product, and 3.04% and 3.17% for the contact lens solution, respectively. RSD was lower than 2%. The obtained results are in a good agreement with the amounts of the H 2 O2 declared by producers (3%) in the both investigated samples. The Pt-C/CPE was also tested for monitoring of the H 2 O2 residual concentration in contact lens solution during its neutralization/decomposition rocess. At 6 h of neutralization treatment 24.68 µg mL -1 of the H 2 O2 was determined which is almost half of the allowedH2 O2 concentration in the case of the contact lens solution concerningthe limit of eye irritation. CPE was surface modified with multiwalled carbon nanotubes (MWCNT) and with composites of MnO 2 -MWCNT or Pt-MWCNT by drop coating method to prepare simply, sensitive and reliable volta mmetric sensors for the determination of H 2 O2 in selected sample. The results of the SEM/ EDS analysis of composite materials have confirmed that the mediators, MnO 2 and Pt articles, are randomly distributed on the surface of MWCNT and represent nearly 5% (m:m) of the composite expressed as Mn and Pt. CV measurements were performed with prepared electrodes in acetate (pH 4.50), phosphate (pH 7.50) and borate (pH 9.18) buffers to characterize the basic electrochemical behavior of H 2 O2 and to select the working potentials suitable for amperometric determination of this target analyte. The Pt-MWCNT/CPE performs well in phosphate buffer pH .50 and acetate buffer solution pH 4.50 in the negative as well as in the positive polarization range with RSD mainly lower than 2.5%. In case of MnO 2 -MWCNT/CPE at 0.30 V and above the H 2 O2 oxidation signal is rem arkable in slightly alkaline media (pH 7.50), at pH 4.50 this electrode showed poor behavior and at pH 9.18 offered acceptable performance. LOQs were in the µg mL -1 concentration range. H 2 O2 was determined in a spiked milk sample by standard addition method after appropriate sample preparation (pH adjustment and centrifugation) and using optimized amperometric p rocedure (acetate buffer pH 4.50, working potential -0.75 V) by Pt-MWCNT/CPE as a working electrode. RSD for three repeated measurements was 2.5%, while the recovery of the method was a bit higher than 71%. The composite materials consisting of MWCNT and Pd (Pd-MWCNT) or Pt containing particles (Pt-WCNT) were applied to the preparation of bulk- modified SPCEs (Pd-MWCNTSPCE and Pt-MWCNT-SPCE) and surface modifiedSPCE (Pd- MWCNT/SPCE). These electrodes, as well as unmodified SPCE and MWCNT-SPCE, were characterized by CV and amperometry in phosphate buffer solution of pH 7.50 for the H 2 O2 determination. Pd-MWCNT-SPCE and PdMWCNT/SPCEare convenient for the etermination of H 2O2 at working potentials from -0.50 to 0.50 V, and Pt-MWCNT-SPCE at investigated working potentials in the range from -0.80 to 0.70 V. These electrodes were then modified with glucose oxidase (GOx) by drop coating a solution of GOxand Nafion ® on their surface, whereby the applied amount of biococktail was optimized. GOx/PdMWCNT-SPCE showed better analytical performance for glucose determination in comparison with GOx/Pd-MWCNT/SPCE. The optimal working potential for GOx/Pd-MWCNT- SPCE was -0.40 V vs. SCE and satisfactory linearity was obtained in the investigated glucose concentration range from 0.16 to 0.97 mmol L -1 (from 29.1 to 174 µg mL -1 ), hile the LOQ was 0.14 mmol L -1 (25 µg mL -1 ). The optimized method based on GOx/Pd-MWCNT-SPCE was successfully applied to the determination of glucose in multifloral honey sample. The results are in a good agreement with those obtained by commercially available equipment for determination of glucose. Optimal working potential for GOx/Pt-MWCNT-SPCE was -0.50 V vs. SCE, and the satisfactory linearity was obtained in the investigated concentration range ofglucose from 65.8 to 260.6 µg mL -1 , with LOQ of 35 µg mL -1 . The optimized method based on GOx/Pt- MWCNT-SPCE was successfully applied for determination of glucose in white grape and glucose tablets (Traubenzucker-bonbons) samples, whereby the obtained results were in a good agreement with the results obtained by Accu-Chek device. Based on the results, the developed analytical methods are first of all simple, reliable and suitable for obtaining fast information about the content of H 2O2 in different types of samples. Certainly the selection of a suitable working electrode, as well as the optimization of experimental conditions are key factors for the successful determination of H2O2 .
Tsai-Chuang, Lee, and 李彩瓊. "The the Study of Fenton、Fenton-like、Photo-Fenton、Photo-Fenton -like processing efficiency reactionand intermediates identification of Acid Bule 1 and Ethyl Violet dye." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/86320946116701801174.
Повний текст джерела國立臺中教育大學
科學應用與推廣學系科學教育碩士班
100
The research aimed to investigate dye degradation using the advanced oxidation treatments, including Fenton, Photo-Fenton, Photo-Fenton-like, and Fenton-like systems. There were eight homogeneous catalytic experiments containing the interactions between two types of dyes, Acid Blue 1 (AB1) and Ethyl Violet (EV), and four oxidation treatments. These methods apply the homogeneous catalytic experiments which yield powerful oxidization to degrade various types of dyes. The purpose is to evaluate the ability of degradation of AB1 and EV and assess the effects of different levels of reagent concentration and pH ratio from these four oxidation treatments respectively. In addition, the HPLC–PDA-ESI-MS is applied to separating and identifying the impact of ABI and EV on the degradation of generated intermediates. As a result, the possible degradation pathways can be inferred and argued in order to provide a stylized fact for the industrial dye wastewater. The experimental results are shown as follows. (1) The optimum AB1 degradation are 0.5mM FeSO4 and 10m MH2O2 during Photo-Fenton and Fenton; and 2mM Fe(NO3)3 and160m MH2O2 during Photo-Fenton-like and Fenton-like. (2) The optimum EV degradation are 0.5mM FeSO4 and 5mM H2O2 during Photo-Fenton and Fenton; and 2mM Fe(NO3)3 and 160mM H2O2 during Photo-Fenton-like and Fenton-like. (3) The optimum pH is about 3 regardless of different oxidation treatments. Regardless of AB1 or EV in the Photo-Fenton, Fenton (Photo-Fenton-like, Fenton-like), requiring very high wattage 254nm UV irradiation effect, can be significantly presentedin the light. Generally speaking, the degradationexperiments show that Photo-Fenton and Fenton treatments are more efficient than the Photo-Fenton-like and Fenton-like. This research also utilizes the HPLC–PDA-ESI-MS for separating and identifying the impact of AB1 and EV in order to uncover the dye degradationpathways. The intermediates are generated by the degradation of AB1 and EV under Photo-Fenton. However, the AB1 with a very small amount of oxidant (H2O2) efficiently accelerates the degradation, leading to rapid Benzene ring-opening reactions, such that few intermediates are found. In addition, the results indicate that the probable degradation pathways are Dealkylation and Hydroxy-lation of chromophore, and cleavage of the conjugated chromophore structure. The findings provide the fundamental applications of photocatalyst to dye degradation.
Lee, Hui-Chun, and 李蕙君. "Hydrothermal Synthesis of CuS as Photocatalyst to Degrade Paraquat via Heterogeneous Photo-Fenton-like Oxidation under Visible Light." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/17007282828036320051.
Повний текст джерела東海大學
環境科學與工程學系
105
Copper(II) sulfide photocatalysts were successfully synthesized by hydrothermal method from the solution of CuCl2·2H2O and Na2S·9H2O at 130°C, with cetyltrimethyl ammonium bromide (CTAB) as a reducing agent, and the synthetic parameters such as reaction time (24 h, 48 h and 72 h) and molar ratio of copper-to-sulfur (1:6, 1:8 and 1:10). The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffuse reflectance (UV-DR) spectroscopy. The XRD peaks were indexed to the pattern of hexagonal phase of CuS and crystallite size were 25.89-38.40 nm. The particles size ranged from 250 to 500 nm. Energy band-gap was in range of 1.88–2.04 eV. The more complex structures (plate, rope-like and hierarchical structure) were obtained with increased sulfur content and reaction times. The photocatalytic activity was evaluated observing degradation of paraquat solution under visible light. The results showed that 100 % removal within 240 min was obtained for solution containing an initial concentration of 40 mg/L paraquat. CuS has better photocatalytic performance then the commercial TiO2 P25 in the presence of H2O2. CuS achieved an optimal photocatalytic performance when Cu:S equal 1:8 via hydrothermal treatment for 72 h, and followed a pseudo-first order with an observed rate constant (kobs) of 2.0×10^-2 /min and an initial reaction rate (r0) of 0.251×10^-2 mM/min. The photocatalytic degradation of paraquat kinetic model fit well with the Langmuir-Hinshelwood adsorption equilibrium constant (Ka) of 10.34 /mM and the surface reaction rate constant (kr) of 2.5×10^-3 /min expressed by Langmuir–Hinshelwood rate law. The presence of H2O2 in heterogeneous photo-Fenton-like system improved the photocatalytic activity due to overcomes the charge recombination in CuS when H2O2 as an electron acceptor and generates more hydroxyl radicals. It has two ways to decompose paraquat. One is direct decomposition via redox reactions from electron-hole pairs on the CuS surface. Another one is indirect decomposition by hydroxyl radicals (OH‧) in surroundings solution.
Yang, Li-Heng, and 楊力恒. "Three Dimensional CuO/TiO2 Hybrid Nanorod Arrays Prepared by Electrodeposition in AAO Membranes as a Fenton-like Photo-catalyst for Dye Degradation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/nmynkz.
Повний текст джерелаЧастини книг з теми "Photo-Fenton-like"
Matafonova, G., S. Popova, I. Tsenter, N. Garkusheva, and V. Batoev. "Comparison of UV Fluences (365 nm) for Water Treatment by Photo-Fenton-Like Process." In Proceedings of the 5th International Conference on Construction, Architecture and Technosphere Safety, 463–72. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91145-4_44.
Повний текст джерела"Rapid Decolorization and Mineralization of Congo Red Using Fe78Si9B13Amorphous Alloy by Photo Fenton-Like Process." In Materials in Environmental Engineering, 765–76. De Gruyter, 2017. http://dx.doi.org/10.1515/9783110516623-075.
Повний текст джерела"Advanced Oxidation Processes for Wastewater Remediation: Fundamental Concepts to Recent Advances." In Materials Research Foundations, 37–86. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901144-2.
Повний текст джерела"Advanced Oxidation Processes for Wastewater Remediation: Fundamental Concepts to Recent Advances." In Materials Research Foundations, 37–86. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901151-2.
Повний текст джерела