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Search results for: REOXIDATION
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The Influence of Sulfate on Anaerobic Ammonium Oxidation in a Sequencing Batch Reactor
PublicationAnaerobic ammonia-oxidizing bacteria have a more comprehensive metabolism than expected - there may be other electron acceptors that oxidize ammonium nitrogen under anaerobic conditions, in addition to the well-known nitrite nitrogen, one of which is sulfate in the sulfammox process. Sulfate-containing compounds are part of the medium for the anammox process, but their concentrations are not particularly high (0.2 g MgSO4 ∙ 7H2O/dm3...
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Chracteristics of anaerobic ammonium oxidation initated by anaerobic granular sludge
PublicationTwo different mixed sludge, anaerobic granular sludge(Ｒ1) and anaerobic granular sludge with mature anaerobic ammonium oxidation (ANAMMOX) sludge (Ｒ2 )were used as the inocula in two up-flow reactors to enrich anaerobic ammonia-oxidizing bacteria (AnAOB)，respectively．The total nitrogen removal rate of Ｒ1 reached 74% in 99 days, while Ｒ2 remained above 70% in only 48 days．The content of extracellular polymeric substance (EPS) in...
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EFFECT OF SURFACE STATE AND STRESS ON AN OXIDATION OF THE ZIRCALOY-2 ALLOY
PublicationZr alloys are widely used as materials for nuclear fuel pellets in the nuclear industry. In the case of the LOCA or RIA happen, a temperature may locally reach high values. Even if the high temperature maintains shortly, the zirconium oxides may become permeable, absorb hydrogen appearing in cooling water from decomposition reaction and crack because of formation and brittle failure of hydrides. Such model cannot so far take into...
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Influence of S-Oxidation on Cytotoxic Activity of Oxathiole-Fused Chalcones
PublicationSynthesis, in vitro cytotoxic activity, and interaction with tubulin of oxidized, isomeric 1-(5-alkoxybenzo[d] [1,3]oxathiol-6-yl)-3-phenylprop-2-en-1-ones and 1-(6- alkoxybenzo[d][1,3]oxathiol-5-yl)-3-phenylprop-2-en-1- ones are described. Most of the compounds demonstrated cytotoxic activity at submicromolar concentrations. It was found that oxidation of sulfur atom of the oxathiole-fused chalcones strongly influenced activity...
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Influence of stress on oxidation behaviour of carbon steel studded coil.
PublicationAnalizowano awarię wężownicy kołkowej ze stali węglowej pracującej przez 10 lat w środowisku przegrzanej pary w temperaturze 290ºC i ciśnieniu 0,67 MPa. Obserwacje mikroskopowe powierzchni i przekroju rury ukazały drobne pęknięcia w ściance wynikające z procesu selektywnego utleniania. Zastosowano metodę elementów skończonych w celu ustalenia zależności postępu korozji od ciśnienia i obciążenia cieplnego.
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Controlling the europium oxidation state in diopside through flux concentration
PublicationThis paper explores the connection between the H3BO3 flux concentration and the co-existence of Eu2+ and Eu3+ dopants within CaMgSi2O6 crystals (diopside). The samples were synthesised using a solid-state synthesis method under varying atmospheric conditions, including oxidative (air), neutral (N2), and reductive (H2/N2 mixture) environments. Additionally, some materials underwent chemical modification by partially substituting...
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Green tea protects against ethanol-induced lipid peroxidation in rat organs
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New dioxomolybdenum(VI) complexes of tetradentate Schiff base as catalysts for epoxidation of olefins
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Selection of the UV irradiation conditions for accelerated edible oil oxidation procedure.
PublicationCelem badań było dobranie optymalnych warunków etapu naświetlania olejów roślinnych z zastosowaniem promieniowania ultrafioletowego. Dobrano powierzchnię naświetlania i grubość filmu oleju, a także odległość próbki oleju od źródła światła i moc promieniowania ultrafioletowego.Lotne produkty utleniania izolowano przy pomocy mikroekstrakcji do fazy stacjonarnej i rozdzielano z zastosowaniem chromatografii gazowej z detektorem płomieniowo-jonizacyjnym.
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The Effect Fabrication Method of Cobalt Base Clad Layer On Air Oxidation
PublicationNapawane warstwy ze stopu kobaltu zostały wykonane za pomocą napawania plazmowego (PTA) oraz laserowego. Zostały one poddane utlenia niu w temperarurze 1100 stopni celsiusza prze 200 godzin. Przeprowadzono badania mikrostruktury i składu chemicznego warstwy tlenkowej oraz głębszych warstw napoiny. Nie stwierdzono wpływu metody wytwarzania na skutki procesu utleniania.
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Association between susceptibility to photodynamic oxidation and the genetic background of Staphylococcus aureus
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Reduced diameter distribution of single-wall carbon nanotubes by selective oxidation
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Effect of Cobalt on the Activity of CuO/CeO2 Catalyst for the Selective Oxidation of CO
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The oxidation of limonene at raised pressure and over the various titanium-silicate catalysts
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Integration of advanced oxidation and membrane filtration for removal of micropollutants of emerging concern
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Comparison of Photocatalytic and Photosensitized Oxidation of Paraben Aqueous Solutions Under Sunlight
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Electrochemical oxidation of ionic liquids at highly boron doped diamond electrodes
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Carbon nanoarchitectures as high-performance electrodes for the electrochemical oxidation of landfill leachate
PublicationNanomaterials and assemblies of the aforementioned into complex architectures constitute an opportunity to design efficient and selective solutions to wide spread and emerging environmental issues. The limited disposal of organic matter in modern landfills generates extremely concentrated leachates characterised by high concentrations of refractory compounds. Conventional biochemical treatment methods are unsuitable, while advanced...
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Effect of double thermal and electrochemical oxidation on titanium alloys for medical applications
PublicationThe research focuses on the development and characterization of innovative thin hybrid oxide coatings obtained in subsequent processes of thermal (TO) and electrochemical (EO) oxidation. Four different surface modifications were investigated and the microstructure was determined, the mechanical, chemical and biological properties of the Ti-13Nb-13Zr alloy were assessed using scanning electron microscopy, X-ray dispersion analysis,...
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Advanced oxidation processes for the removal of mono and polycyclic aromatic hydrocarbons – A review
PublicationAromatic hydrocarbons (AHs) are toxic environmental contaminants presented in most of the environmental matrices. Advanced oxidation processes (AOPs) for the removal of AHs in the account of complete mineralization from various environmental matrices have been reviewed in this paper. An in-depth discussion on various AOPs for mono (BTEX) and polyaromatic hydrocarbons (PAHs) and their derivatives is presented. Most of the AOPs were...
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Sulfate reducing ammonium oxidation (SULFAMMOX) process under anaerobic conditions
PublicationSulfate (SO42-) can be an electron acceptor for ammonium nitrogen (NH4+) oxidation under anaerobic conditions. The process is known as sulfammox and can be a viable alternative to conventional, nitrite (NO2-) dependent, anammox. Two bacterial species, including Bacillus Benzoevorans and Brocadia Anammoxoglobus Sulfate, can perform that process. With sulfammox, an economically inefficient pre-nitration step (due to aeration) is...
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Controlled oxidation of graphite to graphene oxide with novel oxidants in a bulk scale
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Photocatalytic performance of titania nanospheres deposited on graphene in coumarin oxidation reaction
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Wastewater treatment by means of advanced oxidation processes based on cavitation – A review
PublicationHydrodynamic and acoustic cavitation combined with advanced oxidation processes (AOPs), including, among others, the Fenton process, is a promising alternative to the technologies of wastewater treatment technologies in use today. The present review discusses processes based on cavitation combined with AOPs and evaluates their effectiveness in oxidation of organic contaminants. Complete degradation of, among others, p-nitrotoluene,...
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Overall color parameter as a parameter determining the level of oxidation of olive oil
PublicationEdible fats are an important part of a human daily diet. They have a significant effect on the proper functioning of the human body. During frying, the oil is chemically modified and the fats consumed should have the highest oxidation stability. The subject of the study were samples of olive oil bought at local markets in Gdansk. Samples were heated at 20 °C, 60 °C, 100 °C, 140 °C and 180 °C. The aim of the study was to determine...
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Electrochemical oxidation of ionic liquids at highly boron doped diamond electrodes
PublicationUtlenianie elektrochemiczne przy zastosowaniu elektrod diamentowych wysoko domieszkowanych borem (BDD) było badane pod względem przydatności do utylizacji roztworów zawierających ciecze jonowe (ILs). Dwustronne elektrody Si/BDD przygotowano metodą chemicznego osadzania z fazy lotnej wspomaganego plazmą (MW PE CVD). Badanie przy użyciu skaningowej mikroskopii elektronowej (SEM) potwierdziło, że wytworzone warstwy były ciągłe i miały...
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Ab initio chemical kinetics of Isopropyl acetate oxidation with OH radicals
PublicationGlobal reactivity descriptors of isopropyl acetate (IPA) and thermo-kinetic aspects of its oxidation via OH radicals have been studied. Transition state theory (TST) was utilized to estimate the bimolecular rate constants. Ten oxidation pathways have been investigated, and all of them are exothermic. The potential energy diagram has been sketched using different pre- and post-reactive complexes for all reaction pathways. Rate coefficient...
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Anaerobic consortia mediate Mn(IV)-dependent anaerobic oxidation of methane
PublicationManganese-dependent anaerobic oxidation of methane (Mn-AOM) is a major methane sink and vital to mitigating global warming. However, it is difficult for microorganisms to mediate electron transfer between the hardly dissolved CH4 and insoluble Mn(IV) minerals, leading to poor understanding of species mediating Mn-AOM. This study successfully enriched an anaerobic consortium mediating AOM driven by Mn-dependent respiratory growth,...
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Photocatalytic activity of anatase powders for oxidation of methylene blue in water and diluted NO gas
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High temperature oxidation of porous alloys for solid oxide fuel cell applications
PublicationW pracy proszki PI600, 317L i 430L stali użyto do przygotowania porowatych metalowych podłoży dla tlenkowych ogniw paliwowych. Po spiekaniu w różnych temperaturach oceniana była ich porowatość i wysokotemperaturową odporność na korozję. Cykliczna analiza termograwimetryczna, dyfraktometria rentgenowska i obrazów SEM były używane do opisu właściwości tych porowatych stopów. Właściwości elektryczne badano dla wybranych próbek. Wpływ...
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Recent advances in visible light-driven water oxidation and reduction in suspension systems
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Advanced oxidation processes for recalcitrant compounds removal comparison with biofiltration by Corbicula fluminea
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Performance of Particle Oxidation Catalyst and Particle Formation Studies with Sulphur Containing Fuels
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Oxidation Products of 5-Methylcytosine are Decreased in Senescent Cells and Tissues of Progeroid Mice
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Electrochemical oxidation of sulphamerazine at boron-doped diamond electrodes: Influence of boron concentration
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A grey box model of glucose fermentation and syntrophic oxidation in microbial fuel cells
PublicationIn this work, the fermentative and oxidative processes taking place in a microbial fuel cell (MFC) fed with glucose were studied and modeled. The model accounting for the bioelectrochemical processes was based on ordinary, Monod-type differential equations. The model parameters were estimated using experimental results obtained from three H-type MFCs operated at open or closed circuits and fed with glucose or ethanol. The experimental...
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Wastewater treatment by means of Advanced Oxidation Processes at basic pH conditions: A review
PublicationAdvanced oxidation processes (AOPs) have been used as an alternative and effective option for treatment of industrial wastewater, especially in the case of the non-biodegradable compounds. Despite of several well developed AOPs, the majority of them are effective only at acidic or neutral pH, namely Fenton related processes, making the list of available effective advanced oxidation technologies strongly limited. In many cases,...
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Synergistic effect of TiO2 photocatalytic advanced oxidation processes in the treatment of refinery effluents
PublicationDifferent types of photolytic and photocatalytic advanced oxidation processes (AOPs) were used for treatment of refinery effluents from bitumen production. The treatment efficiency was evaluated by analyzing chemical oxygen demand (COD), biological oxygen demand (BOD5), volatile organic compounds (VOCs) and sulfide ions concentration. The studies revealed a synergistic effect of application of external oxidants (O3, H2O2, O3/H2O2)...
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Styrene Oxidation by Copper(II) Complexes Salen-Type Encapsulated into Nay Zeolite
PublicationThe copper(II) complex with a Schiff-base salen-type ligand has been encapsulated in the nanopores of a NaY zeolite by using two different methodologies, the flexible ligand and in situ complex preparation methods. The encapsulated and non-encapsulated copper(II) complexes were screened as catalysts for styrene oxidation by using TBHP as the oxygen source in acetonitrile solvent. Under the optimized conditions, the catalysts exhibited...
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Simultaneous opto-electrochemical monitoring of carbamazepine and its electro-oxidation by-products in wastewater
PublicationThe growing human impact on aquatic environments, due to the extensive use of pharmaceuticals and the release of persistent pollutants, makes it necessary to implement new widespread methods for the characterisation and quantification of such contaminants and relative degradation products. Carbamazepine, 5H-dibenzo[b,f]azepine-5-carboxamide, (CBZ) is a widely used anti-epileptic drug, characterised by its limited removal by conventional...
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Mass Spectrometric Identification of 13C-Labeled Metabolites DuringAnaerobic Propanoic Acid Oxidation
PublicationBiowaste digestion is a possibility to gain biogas as a renewable fuel source. However, the anaerobic food chain may be disrupted by, e.g., substrate overload or by inhibitors, leading to the accumulation of volatile fatty acids (VFAs), predominantly of propanoic acid (PA). VFA Accumulation may cause a rapid pH decrease, less biogas production, or even a total inhibition. To maintain high biogas productivity or to prevent a collapse...
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Effect of native air-formed oxidation on the corrosion behavior of AA7075 aluminum alloys
PublicationThe microstructure of aluminum alloys plays a key role in their corrosion resistance. In particular, the presence of intermetallic precipitates differing in the potential from the alloy matrix induces local corrosion. The study presents the effect of native air-formed oxidation on the corrosion behavior of AA 7075 aluminum alloy. Various microscopic and spectroscopic techniques were used to examine the changes occurring in the...
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Electrochemical oxidation of sulphamerazine at boron-doped diamond electrodes: Influence of boron concentration
PublicationThe boron-doped diamond (BDD) electrodes with different boron concentrations have been tested as electrode material for sulphamerazine (SRM) oxidation in water solution. An investigation of the electrode morphology and molecular structure was carried out using high resolution scanning electron microscopy (SEM) and Raman spectroscopy. Electrochemical results showed clearly that the kinetics and efficiency of SRM oxidation were dependent...
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Oxidation kinetics of Zircaloy-4 alloy at 673 K determined by GDOES technique
PublicationOxidation of zirconium alloys is a process that takes place during the operation of nuclear reactors and is essential for assessing the durability of fuel claddings. The present study was aimed to determine the oxidation kinetics of the Zircaloy-4 alloy using GDOES (glow discharge optical emission spectroscopy) at temperature 673 K corresponding to the conditions of use of fuel pellets. The tests were performed on non-oxidized...
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Oxidation Time Influence on the Structure of the Cobalt Base Clad Layer and Scale Morphology
PublicationZbadano wpływ czasu utleniania na mikrosrukutręi własności mechaniczne a w szczególności mikrotwardość, warstw wykonanych ze stopu kobaltu.Warstwy były wykonane za pomocą napawania plazmowego (PTA). Stop kobaltu podlegał utlenianiu w powietrzu w temperaturze 800 topni celsjusza w czasie 1, 22 i 200 godzin. w wyniku utleniania nastapiło uformowanie warstw zgorzeliny oraz nastapiły zmiany w mikrostrukturze. Zaobserwowano także zmiany...
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Molecular mechanism of the enzymatic oxidation investigated for imidazoacridinone antitumor drug C-1311.
PublicationPraca miala na celu określenie molekularnego mechanizmu enzymatycznej utleniającej aktywacji wymienionego związku przeciwnowotworowego w takim układzie modelowym, w którym wcześniej wykazano jego kowalencyjne wiązanie się do DNA. Badania struktur chemicznych produktów enzymatycznej aktywacji wykazały, że dwa z nich powstają w wyniku dealkilacji łańcucha bocznego cząsteczki, natomiast dwa inne w wyniku aktywacji pierścienia imidazoakrydonu....
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Lipid oxidation and lysine availability in Atlantic mackerel hot smoked in mild conditions.
PublicationZawartość nadtlenków w wędzonych makrelach była o 50% mniejsza, a liczba anizydynowa 2,5 razy większa niż w surowych rybach. Przechowywanie ryb wędzonych w temp. +2C nie wpłynęło na zawartość produktów utlenienia lipidów. Zawartość dostępnej lizyny była podobna w surowych i wędzonych rybach. Skóra ryb wędzonych zawierała 2 razy więcej fenoli niż tkanka mięśniowa.
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Lipid oxidation and lysine availability in smoked Atlantic mackerel fillets and Baltic sprats.
PublicationNie wykazano korelacji między stopniem utlenienia lipidów a ich zawartością w rozmrożonych filetach makreli. Gorące i zimne wędzenie nie wływało na liczbę nadtlenkową w mięsie filetów makreli, natomiast w mięsie wędzonych szprotów była ona znacznie mniejsza niż w rybach surowych. Wędzenie nie powodowało obniżenia dostępnej lizyny, chociaż liczba anizydynowa zwiększyła się dwukrotnie w wędzonych filetach makreli i czterokrotnie...
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Comparison of different advanced oxidation processes for the degradation of room temperature ionic liquids
PublicationZbadano możliwość zastosowania wybranych zaawansowanych technologii utleniania (UV, UV/H2O2, UV/TiO2) do degradacji cieczy jonowych. Do degradacji wytypowano pięć związków: HHiM, BMiM, MiM, OMiM oraz EEiM.
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Pre-oxidation of porous ferritic Fe22Cr alloys for lifespan extension at high-temperature
PublicationPre-oxidation of porous ferritic Fe22Cr alloys was extensively studied in this paper. Weight gain measurements and SEM analysis revealed that pre-oxidation performed at 900◦C for 40 min increased the lifespan of the alloy. A Cr evaporation study did not disclose any significant influence of the pre-oxidation process on the Cr content in the alloy. For a more detailed assessment, TEM imaging and X-ray tomography measurements of...