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wyświetlamy 1000 najlepszych wyników Pomoc
Wyniki wyszukiwania dla: HEAVY METAL IONS
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Dynamical processes in a multi-motor gear drive of heavy slabbing mill
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Heavy stable charged particles search by novel pattern comparator processor
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Diversity of microorganisms from forest soils differently polluted with heavy metals
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The use of weight in motion data to heavy vehicles - pavement interaction analysis
PublikacjaWeight in motion (WIM) is the element of modern intelligent transport systems created to control commercial vehicles and to detect overloaded items. Because all of the vehicles crossing the WIM station are weighed and recognized, given data can be used to vehicle-pavement interaction analysis. The paper presents the results of analysis based on data from seven WIM stations localized in Motorway and National Roads in Poland. The...
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Removal and retention of selected heavy metals in components of a hybrid wetland system
PublikacjaProwadzone badania z określeniem możliwosci retencjonowania metali ciężkichw systemie hybrydowej oczyszczalni hydrofitowej. Wykazano, że znaczna rete- ncja tych pierwiastków następowała w wyniku sorpcji. Przeprowadzona ekstra- kcyjna analiza sekwencyjna wykazała, że Pb2+ i Cu2+ zostały zakumulowane w połączeniach trwałych i nie powinny ulegać wymywaniu z oczyszczalni. Nato- miast Cd2+ wskutek sorpcji we frakcjach labilnych może...
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Accumulation and fate of selected heavy metals in biological wastewater treatment system
PublikacjaBadano akumulację oraz stopień usuwania metali ciężkich (Cd, Cu, Pb, Zn) w systemie biologicznego oczyszczania ścieków. Porównano zawartość wybranych metali w ściekach surowych i oczyszczonych, a także ich stężenie w osadzie czynnym przed i po beztlenowej stabilizacji.
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Influence of alkali metal cations on the photoactivity of crystalline and exfoliated amorphous WO3 – photointercalation phenomenon
PublikacjaIn order to investigate the effect of photointercalation on photoelectrochemical properties, two types of WO3-based photoanodes, bulk and exfoliated have been prepared and investigated. An aqueous exfoliation method is introduced for the simple fabrication of amorphous and hydrated WO3 nanomaterial using commercial bulk WO3 precursor. The comparison of obtained material with bulk WO3 was performed using Raman, UV–vis, and XPS as...
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Diiodo-BODIPY Sensitizing of the [Mo3S13]2– Cluster for Noble-Metal-Free Visible-Light-Driven Hydrogen Evolution within a Polyampholytic Matrix
PublikacjaWe report on a photocatalytic setup that utilizes the organic photosensitizer (PS) diiodo-BODIPY and the non-precious-metal-based hydrogen evolution reaction (HER) catalyst (NH4)2[Mo3S13] together with a polyampholytic unimolecular matrix poly(dehydroalanine)-graft-poly(ethyleneglycol) (PDha-g-PEG) in aqueous media. The system shows exceptionally high performance with turnover numbers (TON > 7300) and turnover frequencies (TOF...
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A Review on Metal–Organic Framework as a Promising Catalyst for Biodiesel Production ENERGY & FUELS
PublikacjaThe rapid depletion of fossil-derived fuels along with rising environmental pollution have motivated academics and manufacturers to pursue more environmentally friendly and sustainable energy options in today’s globe. Biodiesel has developed as an ecologically favorable alternative. However, the mass manufacturing of biodiesel on an industrial scale confronts substantial cost and pricing challenges. To address this issue, high-efficiency...
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Manufacturing of metal-polymer composites for medical applications
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Insulator to correlated metal transition inV1−xMoxO2
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Nature and properties of metal cations in aqueous solutions
PublikacjaOpisano i przeanalizowano budowę chemiczną, właściwości chemiczne i właściwości kinetyczne kationów metali w roztworach wodnych. Zwrócono uwagę na czynniki decydujące o właściwościach fizycznych roztworów.Wskazano na korelacje między stanami koordynacyjnymi soli i właściwościami roztworów. Zwrócono uwagę na nowe elementy chemii roztworów wodnych.
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Metal–Organic Frameworks in Green Analytical Chemistry
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Metal salts reduction during parylenes polymerization
PublikacjaPublikacja o wynikach obliczeń kwantowych o możliwości redukcji niektórych soli metali przy pomocy rodników parylenu w czasie jego polimeryzacji.
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Photocatalytic activity of TiO2 loaded with metal clusters
PublikacjaTiO2 modyfikowano powierzchniowo klasterami metali: srebra, złota i platyny. Zbadano wpływ rodzaju i ilości wprowadzonej domieszki, oraz matrycy TiO2 na aktywność fotokatalityczną otrzymanych próbek. Fotoaktywność próbek badano w reakcji degradacji fenolu (Co = 0,21 mmol/dm3 ) w zakresie światła Vis lub UV. Najwyższą aktywność zaobserwowano dla fotokatalizatorów zawierających 2%Ag, 1%Au oraz 0,5%Pt. Po 60 min naświetlania światłem...
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Investigation and operation problems of metal tanks in Poland
PublikacjaThe paper consists of three parts concerned with steel cylindrical, vertical tank for liquid fuel. In the first part the present trends in tank design and building in Poland are described. The main are: · reduction of environment contamination danger caused by tank leakage and hydrocarbons evaporation, · increasing capacity of new tanks (100000 m3 and more) due to economic factor - reduction of steel amount per m3 of storage capacity....
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Metal-Organic Frameworks in Green Analytical Chemistry
PublikacjaTaking into consideration the rapid expansion of MOFs applications in the analytical chemistry area, it is important to evaluate the existing and future analytical MOF-based methods according to GAC principles. From this point of view, eco-friendly MOFs-based methods should include features such as: green design and synthesis of MOF, evaluation of toxicity issues of MOFs, and incorporation of MOFs in GAC methods. This Chapter will...
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Metal–Organic Frameworks (MOFs) for Cancer Therapy
PublikacjaMOFs exhibit inherent extraordinary features for diverse applications ranging from catalysis, storage, and optics to chemosensory and biomedical science and technology. Several procedures including solvothermal, hydrothermal, mechanochemical, electrochemical, and ultrasound techniques have been used to synthesize MOFs with tailored features. A continued attempt has also been directed towards functionalizing MOFs via “post-synthetic...
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Electrical properties and structure of lead-borate glass containing iron ions
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The role of β-diketones in the extraction of cobalt (II) and nickel (II) ions
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Solvent extraction of copper ions by 3-substituted derivatives of β-diketones
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Structural properties and adsorption of uranyl ions on the nanocomposite hydroxyapatite/white clay
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Nanocrystalline hydroxyapatite enriched in selenite and manganese ions: physicochemical and antibacterial properties
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Binding energies of Eu2+ and Eu3+ ions in β-Ca2SiO4 doped with europium
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Luminescence kinetics in silica gel doped with Tb3+ ions and ZnS:Mn2+ nanocrystals
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Low and high field sites of Cr3+ ions in calcium tetraborate glasses
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Note on the Harmonic Approximation in the Treatment of Entanglement: N Cold Trapped Ions
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Modulation of polyene antibiotics self-association by ions from the hofmeister series
PublikacjaZbadano wpływ soli z serii hofmeistera na zjawisko samoasocjacji antybiotyku polienowego amfoterycyny B i jego pochodnych. Wykazano, że sole te zmieniając właściwości wody, wpływają istotnie na strukturę roztworów tych antybiotyków. Sole kosmotropowe zmniejszają rozpuszczalność związków, chaotropowe dają efekt przeciwny. Informacja ta jest istotna dla zrozumienia natury toksyczności amfoterycyny B i jej pochodnych.
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Nonlinear impedance in oxide glasses containing single and mixed alkali ions
PublikacjaThe aim of the present was to find more clues on the nonlinearities in impedance of oxide glasses. The first family of researched glasses has a composition of FeO-P2O5-Na2O. Oxide glasses containing iron and alkali are well known for a very low alkali ion mobility and may be considered purely polaron conducting. These glasses show no detectable nonlinearities in the impedance spectra. The second was a family of ionic conducting...
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Electrical properties and structure of lead-borate glass containing iron ions.
PublikacjaThe ac and dc conductivity in iron–lead-borate glass samples was investigated in the frequency range from 1 mHz to 1 MHz and in the temperature range from 153 K to 423 K. The structure was investigated by the means of atomic force microscopy (AFM) and the crystalline phases (if present) were identified by the means of X-ray diffractometry. Two types of ac electrical behaviour were observed. The first group of glass samples which...
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A Chemical Recognition Element for Lithium Ions Based on Optical Electronic Absorption.
PublikacjaOtrzymano próbki kserożeli techniką zol-żel. Otrzymane materiały zastosowano do konstrukcji czujników optycznych. Rolę elementu rozpoznającego w uzyskanych próbkach pełnią chromogeniczne etery koronowe zawierające w makro pierścieniu dwie grupy azowe oraz resztę fenolu. W obecności soli metali I grupy układ u okresowego obserwowano zmiany w widmach absorpcyjnych. Dla matrycy zawierającej jako materiał czujnikowy 21-członową...
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Features of ammonium-ions sorption by natural zeolites under dynamic conditions.
PublikacjaW pracy przedstawiono: charakterystykę naturalnych zeolitów, obszar ich praktycznego wykorzystania w zakresie adsorpcyjnego usuwania niektórych zanieczyszczeń z wód oraz wyniki badań procesu adsorpcji jonów amoniowych z wodnych roztworów modelowych (w układzie dynamicznym) na wybranych zeolitach naturalnych.
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Metal dusting phenomena of 501 AISI furnace tubes in refinery fractional distillation unit
PublikacjaThe purpose of this investigation was to conduct the failure analysis of 501 AISI furnace tubes places before distillation column in fractional distillation unit. The investigated furnace tubes were planned to work for ten years however after just two years of exploitation <30% of the material left. The observed corrosion process had the intense and complex character. The well-adhered shiny black deposits and deep, round pits were...
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Methods of Assessment of Metal Contamination in Bottom Sediments (Case Study: Straszyn Lake, Poland)
PublikacjaThe concentrations of six metals (Zn, Cu, Pb, Ni, Cr, and Cd) were investigated in bottom sediments of Straszyn Lake (North Poland). This study was designed to determine a total content of metals and to assess their mobility and bioavailability. The sequential extraction was used to fractionate metals into five fractions: exchangeable, bound to carbonates, bound to Fe–Mn oxides, bound to organic matter, and residual. The evaluation...
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The Metal-Free Regioselective Deuteration of 2-Methylquinolin-8-ol and 2,5-Dimethylquinolin-8-ol, Spectroscopic and Computational Studies
PublikacjaAbstract: Aim and Background: Introducing deuterium to a molecule is of interest to a wide variety of research, including investigation of reaction mechanisms or kinetics, analysis of drug metabolism, structural elucidation of molecules, and syntheses of isotopically labeled materials used for NMR spectroscopy and medicinal research. Objective: The transition-metal-free regioselective deuteration of 2-methylquinolin-8-ol...
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The role of aluminium in metal–organic frameworks derived carbon doped with cobalt in electrocatalytic oxygen evolution reaction
PublikacjaWater electrolysis is one of the most crucial processes in the development of new energy sources, where ultra-clean fuel is produced - hydrogen. Oxygen evolution reaction (OER) is the sluggish process of overall water splitting. Therefore, this study presents the design, characterization and electrochemical study of cobalt-based electrocatalysts embedded into porous carbons derived from an Al-metal–organic...
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Miniaturized Metal-Mountable U-shaped Inductive-Coupling-Fed UHF RFID Tag Antenna with Defected Microstrip Surface
PublikacjaThis study presents a novel miniature ultra-high frequency (UHF) radio frequency identification (RFID) tag for metallic objects. Its arrangement includes a U-shaped feeder, which is inductively coupled to two E-type connected patches. Size reduction is achieved by means of utilizing the U-shaped feeder, and introducing a defection in the connection between the two E-type patches. The defection in the connection area between the...
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Functionalization of the transition metal oxides FeO, CoO, and NiO with alkali metal atoms decreases their ionization potentials by 3–5 eV
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Distribution and concentration of heavy metals in ash during thermal process sewage sludge
PublikacjaKażdego roku na świecie, obserwuje się znaczący wzrost produkcji osadów ściekowych. Przykładowo w 2006 roku, w Polsce ich ilość osiągnęła 1 mln ton w przeliczeniu na sucha masę, w tym ok. połowa pochodziła z oczyszczalni komunalnych. Problem ich zagospodarowania stanowi przedmiot zainteresowania wielu instytucji zajmujących się ochroną środowiska, zarówno w Polsce, jak i na całym świecie. Ich dotychczasowe wykorzystania polegało...
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The application of acetylacetone for the separation of heavy metals in roadside soil belts by extraction methods
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Heavy Metals in Waters and Sediments of Rivers Affected by Brown Coal Mine Waters
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XRF analysis of heavy metals contents in oak wood (Quercur robur L.)
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16S rDNA Pyrosequencing Analysis of Bacterial Community in Heavy Metals Polluted Soils
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Retention of selected heavy metals: Cd, Cu, Pb in a hybrid wetland system
PublikacjaWykonano bilans wybranych metali ciężkich Cd2+, Pb2+, Cu2+ dla pilotowej oczyszczalni hydrofitowej w Przywidzu k. Gdańska. Wykazano m.i. że sorpcja była głównym mechanizmem odpowiedzialnym za usuwanie tych pierwiastków ze ścieków.
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Heavy metals partition between leachate and soilds the course of municipal sewage treatment.
PublikacjaAnalizowano zawarotści metali ciężkich w cieczy nadosadowej i zawiesinie w ściekach oraz osadach ściekowych po stabilizacji oraz odwadnianiu.Badania prowadzono w miejskiej oczyszczalni ścieków ''Wschód'' w Gdańsku.
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TEM imaging of metal nanoparticle cross section
Dane BadawczeTEM microscope was used for a imaging of metallic nanostructures. Metallic nanostructures were manufactured by thermal annealing of thin films. Gold and silver nanostructures were chosen for measurements. Samples were annealed for 15 and 60 minutes at 550 deg.
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Electrical measurements of the dewetting of metal thin films
Dane BadawczeIn situ observations of dewetting of thin films is very complicated. One of the method, that helps to observe it, could be electrical measurements. For experiments, thin gold, silver and gold-silver nanoalloy films were deposited by magnetron sputtering method. Films were deposited on a Corning glass substrates. Samples were measured by four point method...
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Metal-Organic Frameworks-Based Sensors for the Detection of Toxins in Food: A Critical Mini-Review on the Applications and Mechanisms
PublikacjaUsing scientific technologies to detect toxins in food is significant to prevent food safety problems and protect people’s health. Recently, the rise of sensors has made rapid, efficient, and safe detection of food toxins possible. One of the key factors impacting the sensor’s performance is the nanomaterials employed. Metal-organic frameworks (MOFs), with high specific surface area, tunable composition, porous structure, and flexible...
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Kinetics of Intermetallic Phase Precipitation in Manual Metal Arc Welded Duplex Stainless Steels
PublikacjaThe article presents the influence of heat treatment on the kinetics of transformations in lean duplex LDX2101 steel and a weld made of standard duplex 2209 material, which was welded by manual metal arc welding. Changes in the microstructure, hardness, and magnetic phase content were analyzed after heat treatment was conducted at a temperature of 800 °C for a period ranging from 15 to 1440 min. Light and scanning microscopy, Vickers...
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Experimental investigation on welding of 2.25 Cr-1.0 Mo steel with regulated metal deposition and GMAW technique incorporating metal-cored wires
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