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1.
Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent
Bojana Obradovic, Nataša Novak Tušar, Iztok Arčon, Janez Kovač, Mina Jovanovic, Nevenka Rajić, 2016, izvirni znanstveni članek

Opis: In this study the uptake capacity of Mn(II) ions by zeolite A beads was investigated for different initial Mn concentration (100e400 mg Mn dm^-3) in batch mode at 25e55 C. The obtained adsorption capacity varying from 30 to 50 mg Mn g^-1 demonstrated a high affinity of zeolite A towards Mn(II) present in solutions. Kinetic studies indicated the intra-particle diffusion as the rate limiting step up to 45 C with apparent diffusivities in the range (1.2e2.0) x 10^-13 m2 s^-1 and the activation energy of 21.9 kJ mol^-1, which implies strong interactions between the zeolite A and Mn ions. At 55 C ion-exchange became the rate limiting step. The adsorption isotherms were studied at 25 C showing that the Mn adsorption is the best described by the Langmuir model suggesting a homogenous zeolite surface. XPS analysis of the Mnloaded beads showed that there is no surface accumulation of Mn but an almost uniform Mn distribution inside zeolite A, whereas XANES and EXAFS suggested that the adsorption of Mn(II) was followed by the Mn(II) oxidation and oxide formation. Regeneration of the spent zeolite was examined in 8 adsorption/desorption cycles by a chelating Na2EDTA in a fluidized column. It has been found that zeolite A beads could be reused for at least 4 cycles with satisfactory Mn(II) adsorption efficiencies of about 70%.
Najdeno v: ključnih besedah
Povzetek najdenega: ...batch mode at 25e55 C. The obtained adsorption capacity varying from 30 to 50 mg...
Ključne besede: Zeolite A Manganese Adsorption kinetics EXAFS/XANES XPS
Objavljeno: 01.04.2016; Ogledov: 2356; Prenosov: 0
.pdf Polno besedilo (1,27 MB)

2.
Structural and CO [sub] 2 capture properties of ethylenediamine-modified HKUST-1 metal-organic framework
Janez Kovač, Angela Terracina, Gianpiero Buscarino, Matjaž Mazaj, Nika Vrtovec, S. Agnello, Iztok Arčon, Nataša Zabukovec Logar, 5, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...functionalization, modification, adsorption, extended X-ray absorption fine structure, materials...
Ključne besede: functionalization, modification, adsorption, extended X-ray absorption fine structure, materials
Objavljeno: 17.10.2020; Ogledov: 132; Prenosov: 0

3.
Oxalic acid adsorption states on the clean Cu(110) surface
Sara Fortuna, 2016, izvirni znanstveni članek

Opis: Carboxylic acids are known to assume a variety of configurations on metallic surfaces. In particular oxalic acid on the Cu(110) surface has been proposed to assume a number of upright configurations. Here we explore with DFT calculations the possible structures that oxalic acid can form on copper 110 at different protonation states, with particular attention at the possibility of forming structures composed of vertically standing molecules. In its fully protonated form it is capable of anchoring itself on the surface thanks to one of its hydrogen-free oxygens. We show the monodeprotonated upright molecule with two oxygens anchoring it on the surface to be the lowest energy conformation of a single oxalic molecules on the Cu(110) surface. We further show that it is possible for this configuration to form dense hexagonally arranged patterns in the unlikely scenario in which adatoms are not involved.
Najdeno v: ključnih besedah
Ključne besede: oxalic acid, oxalate, cu(110), copper, surface, adsorption, density functional theory, DFT
Objavljeno: 11.10.2016; Ogledov: 1770; Prenosov: 0
.pdf Polno besedilo (1,21 MB)

4.
Stable carbon isotope analysis of selected halocarbons at parts per trillion concentration in an urban location
M Iqbal Mead, M Anwar H Khan, Ian D Bull, Iain R White, Graham Nickless, Dudley E Shallcross, 2008, izvirni znanstveni članek

Opis: ∂13C values of a suite of halocarbons have been determined in an urban background site in Bristol, UK. A novel mobile preconcentration system, based on the use of multi-adsorbent sample tubes, has been developed for trapping relatively large-volume air samples in potentially remote areas. An Adsorption Desorption System-Gas Chromatography-Electron Capture Detector was used to measure the mixing ratios of the selected halocarbon species, while a Gas ChromatographyCombustionIsotope Ratio Mass Spectrometer was used to determine ∂13C values. For the species with strong local sources, the variation of isotope ratios has been observed over the experimental period. Some of the results reported in the present study differ from previously reported values and reasons for this are discussed. The reporting of different ∂13C values for selected halocarbons from different areas in the present study suggests that ∂13C values may be used to determine the relative magnitudes of anthropogenic and biogenic sources.
Najdeno v: ključnih besedah
Povzetek najdenega: ...air samples in potentially remote areas. An Adsorption Desorption System-Gas Chromatography-Electron Capture Detector was used...
Ključne besede: Adsorption Desorption System (ADS), Automated Thermal Desorber (ATD), Electron Capture Detector (ECD), Gas Chromatography (GC), Isotope Ratio Mass Spectrometry (IRMS)
Objavljeno: 18.07.2019; Ogledov: 638; Prenosov: 0
.pdf Polno besedilo (227,35 KB)

5.
Year-long measurements of C1-C3 halocarbons at an urban site and their relationship with meteorological parameters
Dudley E Shallcross, Brian G R Greally, Alison C Rivett, Damien Martin, Alan Knights, Graham Nickless, Ben Golledge, Iain R White, M Iqbal Mead, M Anwar K Khan, 2009, izvirni znanstveni članek

Opis: The mixing ratios of 11 C1–C3 halocarbons have been measured using a GC–twin‐linked ECD system over the period from October 2004 to December 2005 at an urban site in Bristol, UK. Time series and seasonal variations of the halocarbons were analysed over the period to determine biogenic and anthropogenic sources and sinks. Correlations between the target halocarbons were also observed, suggesting common sources within the area. Wind rose plots for all halocarbons have been used to assist in the determination of halocarbons sources. Halocarbon concentrations are highest at low‐wind speeds and decrease as wind speed increases, a few species (CCl4 and CH3Cl most notably) rise at very high‐wind speeds suggesting release from the Bristol Channel.
Najdeno v: ključnih besedah
Povzetek najdenega: ... adsorption–desorption system, anthropogenic halocarbons, biogenic halocarbons, electron capture...
Ključne besede: adsorption–desorption system, anthropogenic halocarbons, biogenic halocarbons, electron capture detector, gas chromatography, methyl bromide
Objavljeno: 18.07.2019; Ogledov: 590; Prenosov: 0
.pdf Polno besedilo (897,06 KB)

6.
7.
Calix[4]arene-based porous organic nanosheets
Tina Škorjanc, Dinesh Shetty, izvirni znanstveni članek

Najdeno v: ključnih besedah
Ključne besede: calixarene, nanosheets, covalent polymer, iodine adsorption
Objavljeno: 02.09.2020; Ogledov: 135; Prenosov: 0
.pdf Polno besedilo (4,87 MB)

8.
Thioether-crown-rich calix[4]arene porous polymer for highly efficient removal of mercury from water
Tina Škorjanc, Dinesh Shetty, izvirni znanstveni članek

Najdeno v: ključnih besedah
Ključne besede: Mercury, Sulfur, Metals, Adsorption, Polymers
Objavljeno: 02.09.2020; Ogledov: 128; Prenosov: 0
.pdf Polno besedilo (3,46 MB)

9.
Fast and efficient removal of paraquat in water by porous polycalix [n] arenes (n= 4, 6, and 8)
Ali Trabolsi, Jesus Raya, Zouhair Asfari, Bikash Garai, Tina Škorjanc, Sandra Boutros, Dinesh Shetty, 2020, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...paraquat, adsorption, calixarene, covalent polymers, water purification...
Ključne besede: paraquat, adsorption, calixarene, covalent polymers, water purification
Objavljeno: 02.09.2020; Ogledov: 122; Prenosov: 0
.pdf Polno besedilo (1,35 MB)

10.
Rapid and Efficient Removal of Perfluorooctanoic Acid from Water with Fluorine-Rich Calixarene-Based Porous Polymers
Ali Trabolsi, Ozgur Yazaydin, Serdal Kirmizialntin, Mark Anthony Olson, Zouhair Asfari, Jesus Raya, Liaqat Ali, Turan Selman Erkal, Tina Škorjanc, Ilma Jahovic, Dinesh Shetty, 2020, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...Perfluorooctanoic acid, calixarene, adsorption, covalent polymers...
Ključne besede: Perfluorooctanoic acid, calixarene, adsorption, covalent polymers
Objavljeno: 02.09.2020; Ogledov: 119; Prenosov: 0
.pdf Polno besedilo (16,88 MB)

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