Adsorption

http://link.springer.com/journal/10450

List of Papers (Total 149)

Sorption of CO2 in lignites from Polish coal mines: measurements and thermodynamic analysis

The purpose of the work presented in this paper was to adapt the Multiple Sorption Model (MSM), originally developed for hard coals, to study sorption in lignites. It also includes an analysis of the sorption process of small molecule compounds in lignites. Measurements were made of the sorption isotherms of carbon dioxide in two samples of lignite from Polish collieries at...

Identification of hard coal surface structure using polar and apolar small molecule substances

The paper presents a numerical approach to the analysis of the statistical effect of functional groups on the sorption of methanol and water on hard coal samples. The material used for the analysis was obtained from numerous samples of hard subbituminous and bituminous coals up to anthracite from different Polish coal mines and includes sorption isotherms of water and methanol...

Evaluation of the SBA-15 materials ability to accumulation of 4-chlorophenol on carbon paste electrode

The adsorption of 4-chlorophenol (4-CP) from an aqueous solution on three ordered mesoporous silica materials (commercial unmodified SBA-15-Sigma, synthesized unmodified SBA-15 and amino-functionalized SBA-15-NH2) was studied. The adsorption isotherms were analyzed using the Generalized Langmuir equation taking into account the energetic heterogeneity. The adsorption capacities...

Kinetic models assessment for swelling of coal induced by methane and carbon dioxide sorption

The ability of five kinetic equations to describe the sorption kinetics and expansion rate of solid coal samples was investigated. The conducted experiment included the measurements of sorption of methane and carbon dioxide on cuboidal hard coal samples at high pressure using volumetric method. Simultaneously the kinetics of coal sorption induced swelling was monitored. All of...

Adsorption equilibrium and kinetics of selected phenoxyacid pesticides on activated carbon: effect of temperature

The temperature influence on equilibrium and kinetics of adsorption of 4-chlorophenoxyacetic and 3-bromophenoxypropionic acids from aqueous solutions on the Norit activated carbon was studied. The correlations between temperature and parameters characterizing adsorption process were found. Increase of rate of adsorption kinetics of phenoxy pesticides with temperature was observed...

Net, excess and absolute adsorption and adsorption of helium

The definitions of absolute, excess and net adsorption in microporous materials are used to identify the correct limits at zero and infinite pressure. Absolute adsorption is shown to be the fundamental thermodynamic property and methods to determine the solid density that includes the micropore volume are discussed. A simple means to define when it is necessary to distinguish...

Positron porosimetry study of mesoporous polymer–silica composites

The polymer–SiO2 composites prepared using polymers with different chemical composition and porosity (i.e. XAD4, XAD16, and XAD7) as well as series of composites synthesized with different contents of silica species and at different pH were investigated. The study was conducted to compare the results of nitrogen adsorption and positron porosimetry for these three sets of samples...

Zeta potential and surface charge of DPPC and DOPC liposomes in the presence of PLC enzyme

Zeta potential of liposomes is often measured in studies of their properties and/or applications. However, there are not many papers published in which zeta potential was determined during enzymatic reaction of a lipid. Therefore in this paper size, polydispersity index, and zeta potentials of 1,2-dipalmitoylsn-glycero-3-phosphatidylcholine (DPPC) and 1,2-dioleoyl-sn-glycero-3...

Characteristics of surface and electrochemical properties of composites with fumed metal oxides and hydroxyapatite

Hydroxyapatite composite is a very important biomaterial, which can be applied in various life areas. Hydroxyapatite and its composites with fumed oxides ST20, AST1, Al2O3, A90, and A300 were prepared and studied using X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy adsorption, potentiometric titration, quasi-elastic light...

A qualitative approach to adsorption mechanism identification on microporous carbonaceous surfaces

The paper presents results of research on identification of localized and other adsorption mechanisms, on geometrically heterogeneous graphite-like carbonaceous surfaces. It attempts to get an insight into properties of individual adsorptive molecule movement near attractive adsorption sites, arising from adsorbent surface geometrical heterogeneities. In particular, a shape and...

Study of sorption processes of strontium on the synthetic hydroxyapatite

Adsorption of 90Sr on hydroxyapatite is important in many fields of life. The aim of the paper was to discuss the changes in the double electrical layer at the hydroxyapatite/electrolyte solution interface during Sr ions adsorption and to establish the relations between time and adsorption on this material. Hydroxyapatite was prepared by the wet method, characterized by the X-ray...

The influence of surface energetic heterogeneity on electrofluidic gating of a metal oxide surfaces

We developed a theoretical model which describes the influence of the applied potential to the wall of an oxide nanochannel on the diffuse layer potential in the solution filling the nanopore. It was assumed that the surface of oxide is energetically heterogeneous and electrolyte ions from the solution can adsorb on channel walls. We performed calculations for two oxides: SiO2...

Synthesis, surface characterization and electrokinetic properties of colloidal silica nanoparticles with magnetic core

In order to obtain functionalized silica colloids with magnetic properties, the three-step reaction, was carried out. The aqueous suspension of iron oxide nanoparticles as magnetic core (maghemite—γ-Fe2O3) was synthesized according to the Massart’s method (Massart in IEEE Trans Magn 17:1247–1248, 1981). A silica shell was obtained onto maghemite employing a modified sol–gel...

Synthesis of the mesostructured polymer-silica composite and silicon dioxide through polymer swelling in silica precursor

Tetrabutoxysilane (TBOS) transition introduced into the preformed porous polymer was found as an effective method in the preparation of highly porous silica adsorbents. The swelling of the acrylic polymer XAD7HP in TBOS causes the total infiltration of polymer beads by the silica precursor. Transformation of TBOS in aqueous solution at presence of the surfactant...

New functionalised polymeric microspheres for multicomponent solid phase extraction of phenolic compounds

Three new porous copolymers possessing basic character were prepared by chemical modification of polymeric adsorbent (copolymer of bis[4(2-hydroxy-3-methacryloyloxypropoxy)phenyl]sulfide and glycidyl methacrylate, BES.DM + GMA). Modification was carried out by reactions of surface epoxide groups of the precursor with amines: butylenediamine, diethylenetriamine and...

The influence of geometric heterogeneity of closed carbon nanotube bundles on benzene adsorption from the gaseous phase-Monte Carlo simulations

Benzene adsorption from the gaseous phase at 298 K and the thermodynamics of this process using Monte Carlo methods is studied. A series of closed single-walled carbon nanotube (SWCNT) bundles (triangular packing arrangement) with various distance between nanotubes is investigated. Isolated closed nanotube is treated as the reference system. Benzene is considered as a model...

Synthesis and characterization of organic–inorganic hybrid microspheres

This study presents the synthesis of hybrid microspheres based on monomers of various chemical nature. As organic compounds, styrene and 1,4-divinylbenzene were used, whereas triethoxyvinylsilane (TEVS) was applied as an inorganic one. Four different systems with the increasing quantity of TEVS were studied. Then inorganic parts of TEVS were removed with aqueous solution of NaOH...

Effect of micropore size distribution on phenol adsorption on steam activated carbons

The adsorption of phenol on microporous activated carbons (ACs) produced in laboratory from polyethyleneterephtalate (PET), furfuryl alcohol (PFA), polyacrylonitrile (PAN) and anthracene oil pitch (ASN) have been studied. The ACs have been obtained by carbonization and subsequent steam activation at 850 °C to 50 % burn off. For comparison, commercial activated carbons from...

Effect of adsorbate properties on adsorption mechanisms: computational study

The paper presents results of research on identification of localized and mobile adsorption mechanisms of several selected adsorbates, on geometrically heterogeneous graphite-like carbonaceous surface. The proposed approach is intended to examine effects of surface geometrical heterogeneity on shape and volume of space occupied by the selected adsorbate molecules. In particular...

Sorptive properties of aluminium ions containing mesoporous silica towards l-histidine

The applicability of aluminium-containing mesoporous materials as carriers for l-histidine has been evaluated for the first time. The modified mesoporous silica such as SBA-15 and SBA-16 were synthesised by hydrothermal method and characterised by low-temperature nitrogen sorption, transmission and scanning microscopy, X-ray and laser diffraction methods. The results of these...

The effect of mineral matter on the physicochemical and sorption properties of brown coal-based activated carbons

A series of new carbonaceous adsorbents has been obtained by means of direct and physical activation of Polish brown coal, characterised by high mineral matter content. The influence of activation procedure on the porous structure development, acidic and basic surface groups generation as well as the sorptive properties of the adsorbents prepared toward liquid and gas pollutants...

Creation of chiral adsorbed structures using external inputs: results from lattice Monte Carlo simulations

Patterning of solid surfaces with organic molecules has been recognized as a promising method to create functional 2D matrices with tunable structure and properties. In this work we use the lattice Monte Carlo simulations to study chiral pattern formation in adsorbed systems comprising simple molecular building blocks differing in shape. To that end we consider five-membered...