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Search results for: HYDROLYTIC DEGRADATION
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Degradation of Polypropylene Membranes Applied in Membrane Distillation Crystallizer
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Thermal degradation of copolymers based on selected alkyl methacrylates
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Environmental degradation of the Cr-Mo steels in liquid hydrocarbons
PublicationPrzedstawiono podatność stali stopwych 26H2MF i 34HNM do naprężeniowego pękania korozyjnego. Środowiskiem do badań było paliwo ciężkie i zużyty olej mineralny.
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An experimental investigation of the influence of plasticity on creep degradation rate
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Photosensitive chitosan for visible-light water pollutant degradation
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Photocatalytic degradation using nitrogen-modified titanium dioxide
PublicationPrzepływowy reaktor z wypełnieniem został zastosowany do przeprowadzenia fotodegradacji 4-chlorofenolu za pomocą światła widzialnego. Fotokatalizator w postaci tlenku tytanu(IV) modyfikowanego azotem, został naniesiony na powierzchnię kulek szklanych. Źródło światła widzialnego stanowiła 8W lampa fluorescencyjna. Powietrze było w sposób ciągły przepuszczane przez zawartość reaktora.
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Pathways and analytical tools in degradation studies of organic pollutants
PublicationWszystkie substancje chemiczne podlegają różnym procesom w wyniku wielu reakcji chemicznych, biochemicznych czy też fotochemicznych. W zależności od elementu środowiska w jakim znajduje się analit (np.: gleba, sedymenty, wody powierzchniowe i podziemne), może on ulegać powolnym przemianom w wyniku różnych procesów. W pracy przedstawiono niektóre drogi degradacji wybranych substancji w różnych warunkach. Omówiono problem identyfikacji...
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Hydrogen degradation of high-strength weldable steels in seawater
PublicationOceniono podatność na niszczenie wodorowe stali spawalnych o wysokiej wytrzymałości przy obciążeniach monotonicznie rosnących. Badano dwa gatunki stali ulepszonych cieplnie i ich złącza spawane. Przeprowadzono próby rozciągania z małą prędkością odkształcania w wodzie morskiej przy polaryzacji katodowej. Wykonano próby przenikania wodoru metodą Devanathana-Stachurskiego.
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Hydrogen degradation of high strength low alloyed steels.
PublicationBadano wpływ polaryzacji katodowej na własności stali węglowej, stali o podwyższonej i wysokiej wytrzymałości metodą stałego powolnego odkształcania.Stwierdzono, że stopień kruchości wodorowej każdej z badanych stali zależał od stężenia wodoru dyfuzyjnego.
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Odour Samples Degradation During Detention in Tedlar® Bags
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Degradation kinetics and mechanism of pentoxifylline by ultraviolet activated peroxydisulfate
PublicationDegradation of pentoxifylline (PTX) by sodium peroxydisulfate (SPDS) assisted by UV irradiation has been investigated in deionized water. The treatment was more favorable over direct photolysis or peroxydisulfate oxidation alone. The effects of various parameters, including different dosage of oxidant agent, PTX concentration, initial solution pH levels, and the presence of inorganic ions like chloride, nitrate and carbonate have...
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Hydrogen degradation of structural steels in technical hydrocarbon liquids
PublicationDla stali stopowych przeprowadzono badania absorpcji wodoru, mechaniczno-korozyjne przy stałej małej prędkości odkształcania, przy stałym obciążeniu i przy obciążeniu cyklicznie-zmiennym. Środowiskiem było paliwo kotłowe, przepracowany olej mineralny oraz gliceryna. Stwierdzono, iż pochłonięty wodór nie powoduje przedwczesnego zniszczenia stali poddanych działaniu stałego obciążenia ponizej granicy plastyczności oraz, że zaabsorbowany...
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The influence of the UV irradiation on degradation of virgin rapeseed oils
PublicationThis paper presents research which is a continuation of the investigations described earlier. The aim of these studies was to determine the influence of UV irradiation on flavor and the oxidative stability of different rapeseed oils varieties. For the purpose of this study, oil samples underwent accelerated deterioration for 4.5 h under a UV light test. In the obtained sample, characteristic values (peroxide (PV, 1.23–1.62 meq...
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Phototransformation of Amlodipine: Degradation Kinetics and Identification of Its Photoproducts
PublicationNowadays, monitoring focuses on the primary compounds and does not include degradation products formed during various biological and chemical processes. Transformation products may have the same effects to human health and the environment or sometimes they can be more toxic than the parent compound. Unfortunately, knowledge about the formation of degradation products is still limited, however, can be very important for the environmental...
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Influence of Staphylloccoccus bacteria adhesion on the degradation of the Ti6Al4V alloy
PublicationThe paper deals with bacteria adhesion and the degradation of the Ti6Al4V alloy
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Environmental Degradation of Engineering Materials & Materials Engineering and Technologies
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Approach to evaluation of time to the critical degradation of ship pipelines
PublicationIn the article an approach to the problem of estimating time to the critical degradation of ship pipelines is considered. Such an assessment would consist of six stages. The fundamental idea is to include to the estimation of time to failure of pipelines such elements like: materials that the pipelines are made, destructive physical phenomena taking place in them and applied means of protection. The result of that evaluation should...
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The impact of material degradation on the resistance and reliability of truss structures
PublicationThe paper analyses limit load-carrying capacity and buckling load of truss towers used to support high voltage power lines. The analysed typical structure was subjected to characteristic loads and their combinations. The results were applied to assess structural resistance with regard to steel corrosion in the long-term operation. The extent of structural deterioration was assessed due to Young's modulus decrement in the course...
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Photocatalytical degradation of toluene and cyclohexane using LED illumination
PublicationA sol-gel process followed by hydrothermal reaction was used to prepare coupled WO3-TiO2 photocatalysts with varying amounts of WO3 in respect to TiO2 (3 mol% and 5 mol% respectively). Additionally, photocatalysts have been subjected to different calcination temperatures of 400ºC and 800ºC, which allowed us to compare how these affect photodegradation efficiency. Photocatalysts were characterized under a scanning electron microscope,...
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Degradation of ferritic X10CrAlSi18 stainless steel caused by slurry
PublicationThe slurry erosion tests of ferritic X10CrAlSi18 steel were carried out using a slurry pot device. In order to investigate the erosion process, two series of tests were performed: first one with a constant impact velocity of 5 m/s, 7 m/s and 9 m/s and the second one, during which the impact velocity was changed after every exposure. During each test, an influence of test conditions on volume loss, surface hardness and roughness...
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Corrosion degradation impact on mechanical properties of structural steel
PublicationRecently, extensive research was conducted regarding the impact of corrosion degradation on the mechanical properties of structural steel. Studies show that at the material level, the microstructure is somewhat unchanged due to corrosion degradation. However, the corrosion causes pits and structural surface irregularities that consequently impact the mean stress-strain response of typical coupon specimens subjected to tensile loading....
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Peroxymonosulfate-assisted photocatalytic degradation of artificial sweeteners in water
PublicationIn the present study, peroxymonosulfate (PMS) activation was proposed for efficient photocatalytic degradation of aspartame, acesulfame, saccharin, and cyclamate - artificial sweeteners frequently present in wastewaters and surface waters worldwide. The TiO2 nanosheets with exposed {0 0 1} facets were synthesised using the fluorine-free lyophilisation technique as a green concept for the synthesis and used for the photodegradation...
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Membrane Filtration-Assisted Enzymatic Hydrolysis Affects the Biological Activity of Potato Juice
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Beta-Galactosidases of Pseudoalteromonas sp. – Characteristics and application for lactose hydrolysis and galactopyranosides synthesis
PublicationBeta-galactosidase [EC 3.2.1.23] is an enzyme that catalyzes the hydrolysis of O-glycosidic linkages in galactosides. It has biotechnological applications in the dairy industry for the production of milk with a low content of lactose and galactooligosacharides for use in healthy food. The transgalactosylation activity of beta-galactosidase can be used in the synthesis of alkyl galactopyranosides. Due to the fact that conditions of...
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Bio based PUR-PIR foams thermal degradation (TG) and isoconversional kinetics
Open Research DataIn the present work, we perform a thorough thermogravimetric (TG) analysis of the bio-based polyurethane – polyisocyanurate (PUR-PIR) foams in both nitrogen and oxygen atmosphere. A sustainable element of the foam was a biopolyol obtained via acid-catalyzed liquefaction of Zostera Marina and Enteromorpha Algae biomass. Based on isoconversional analysis...
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Enhanced degradation of glucocorticoids, a potential COVID-19 remedy, by co-fermentation of waste activated sludge and animal manure: The role of manure type and degradation mechanism
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Hydrogen Production from Energy Poplar Preceded by MEA Pre-Treatment and Enzymatic Hydrolysis
PublicationThe need to pre-treat lignocellulosic biomass prior to dark fermentation results primarily from the composition of lignocellulose because lignin hinders the processing of hard wood towards useful products. Hence, in this work a two-step approach for the pre-treatment of energy poplar, including alkaline pre-treatment and enzymatic saccharification followed by fermentation has been studied. Monoethanolamine (MEA) was used as the...
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Optimization of Saccharification Conditions of Lignocellulosic Biomass under Alkaline Pre-Treatment and Enzymatic Hydrolysis
PublicationPre-treatment is a significant step in the production of second-generation biofuels from waste lignocellulosic materials. Obtaining biofuels as a result of fermentation processes requires appropriate pre-treatment conditions ensuring the highest possible degree of saccharification of the feed material. An influence of the following process parameters were investigated for alkaline pre-treatment of Salix viminalis L.: catalyst concentration...
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Cuticle hydrolysis in four medically important fly species by enzymes of the entomopathogenic fungusConidiobolus coronatus
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Properties of retrograded and acetylated starch produced via starch extrusion or starch hydrolysis with pullulanase
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Mechanistic studies of the hydrolysis of p-nitrophenyl sulfate catalyzed by arylsulfatase from Helix pomatia
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Methods of Assessing Degradation of Supercapacitors by Using Various Measurement Techniques
PublicationThis article presents the qualitative analyses of the construction of supercapacitor samples. The analyses are based on the suggested thermographic measurements as well as the technique of testing the inherent noise of the investigated element. The indicated assessment methods have been referred to the currently used parameters for the qualitative evaluation of supercapacitors. The approach described in this paper, which introduces...
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Identification and localization of organic coating degradation onset by impedance imaging
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Assessment of organic coating degradation via local impedance imaging
PublicationThe paper presents a new approach to organic coating condition evaluation at micrometer scale using localized impedance measurements. It is based on atomic force microscopy (AFM) in contact mode. Impedance is measured between conductive AFM tip and metal substrate covered with organic coating. A single-frequency voltage perturbation signal is applied between the electrodes and current response signal is registered. As the tip is...
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Photocatalytic activity of layered MoS2 in the reductive degradation of bromophenol blue
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The degradation mechanisms of a nanobainitic steel under cavitation erosion conditions
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The influence of polypropylene degradation on the membrane wettability during membrane distillation
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Environmental degradation of titanium biomaterials: mechanisms, effects, testing and evaluation
PublicationPrzedyskutowano możliwe przyczyny oraz mechanizmy degradacji biomateriałów tytanowych, używanych jako długoterminowe implanty stawów. Dokonano przeglądu wpływu impalntów metalicznych w ludzkim ciele. Przedstawiono bieżące procedury badania oraz ich wady. Zaproponowano procedurę oszacowania biomateriałów na implanty.
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Immobilized TiO2for Phenol Degradation in a Pilot-Scale Photocatalytic Reactor
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Solar Photocatalytic Degradation of Sulfamethoxazole by TiO2 Modified with Noble Metals
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Spectroscopic investigations into degradation of polymer membranes for fuel cells applications
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Hydrogen degradation of high-strength weldable steels in sea-water.
PublicationW pracy przedstawiono ocenę degradacji wodorowej dwóch gatunków stali spawalnych o wysokiej wytrzymałości 17HMBVA i 14HNMBCu. Badania wykonano na materiałach rodzimych i złączach spawanych stali w oparciu o próbę rozciągania z małą prędkością. Próby wykonano w powietrzu oraz środowisku wody morskiej przy polaryzacji katodowej. Dodatkowo wykonano elektrochemiczne badania przenikania wodoru i wyznaczono zależności stężenia wodoru...
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Accelerated degradation of organic coatings due to cyclic mechanical stress
PublicationPotrzeba okresowej renowacji wymalowań na obiektach technicznych wynika z naturalnej degradacji powłok ochronnych wskutek oddziaływania czynników obecnych w miejscu eksploatacji. W niniejszej pracy opisano synergiczny wpływ dwóch z nich - promieniowana ultrafioletowego i cyklicznych naprężeń mechanicznych - na trwałość komercyjnie stosowanego zestawu powłokowego przeznaczonego do ochrony konstrukcji mostowych.
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Hydrogen degradation of the 26H2MF alloy steel in H2SO4 and hydrocarbon environments.
PublicationSTAL 26H2MF ZOSTALA PODDANA RÓZNEJ OBRÓBCE CIEPLNEJ, PO KTÓREJ UZYSKAŁA ONA RÓŻNĄ MIKROSTRUKTURĘ ORAZ CHARAKTER PRZEŁOMU. WYKONANO PRÓBY POWOLNEGO ODKSZTAŁCANIA W ROZCIEŃCZONYM KWASIE SIARKOWYM, PALIWIE CIĘZKIM I PRZEPRACOWANYM OLEJU SILNIKOWYM PRZEPRACOWANYM.
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Degradation of organic coatings subjected to alternating mechanical stress impact.
PublicationW pracy przedstawiono wyniki badań nad wpływem cyklicznych naprężeń mechanicznych na dwa rodzaje systemów powłokowych stosowanych do ochrony konstrukcji mostowych. Powłoki epoksydowe i winylowe poddano cyklom zginanie/odpuszczenie w granicach odkształceń elastycznych materiału podłoża. Stan powłok oceniano przy użyciu techniki elektrochemicznej spektroskopii impedancyjnej. Otrzymane wyniki porównano z zachowaniem analogicznych...
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Hydrogen degradation of 26H2MF and 34HNM steels used in ship engines.
PublicationPrzedstawiono wyniki badań podatności stali 26H2MF i 34HNM na niszczenie wodorowe, uzyskane po badaniach w roztworze kwasu siarkowego przy równoczesnej polaryzacji katodowej. Wykazano, że skład i obróbka cieplna stali mają wpływ na ich podatność. Efejkt ten przypisano różnej zdolności pułapkowania wodoru przez stale.
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Hydrogen degradation of high-strength weldable steels in sea-water
PublicationW artykule przedstawiono ocenę podatności stali o wysokiej wytrzymałości oraz ich złączy spawanych na kruchość wodorową. Wykonano próby powolnego rozciągania na stalach gatunku 17HMBVA i 14HNMBCu oraz ich złączach spawanych, w środowisku wody morskiej, przy polaryzacji katodowej. Wykonano badania elektrochemiczne przenikania wodoru przez membrany pobrane z rożnych obszarów złączy spawanych.
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Experimental and numerical identification of corrosion degradation of ageing structural components
PublicationThe study presents experimental and numerical identification of corrosion degradation of thin-walled structural components employing guided wave propagation. The steel structural components are subjected to through-thickness varying corrosion degradation levels. The developed approach using the non-destructive guided wave-propagation quantifies the equivalent average corrosion degradation level by exploring a limited number of...
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Susceptibility to Degradation in Soil of Branched Polyesterurethane Blends with Polylactide and Starch
PublicationA very important method of reducing the amount of polymer waste in the environment is the introduction to the market of polymers susceptible to degradation under the influence of environmental factors. This paper presents the results of testing the susceptibility to degradation in soil of branched polyesterurethane (PUR) based on poly([R,S]-3-hydroxybutyrate) (R,S-PHB), modified with poly([D,L]-lactide) (PLA) and starch (St). Weight...
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High-performance activation of ozone by sonocavitation for BTEX degradation in water
PublicationThis work presents a novel advanced oxidation process (AOP) for degradation of emerging organic pollutants – benzene, toluene, ethylbenzene and xylenes (BTEXs) in water. A comparative study was performed for sonocavitation assisted ozonation under 40–120 kHz and 80–200 kHz dual frequency ultrasounds (DFUS). Based on the obtained results, the combination of 40–120 kHz i.e., low-frequency US (LFDUS) with O3 exhibited excellent oxidation...