Adsorption

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

List of Papers (Total 150)

The effect of demineralization on the physicochemical and sorption properties of activated bio-carbons

Residues after supercritical extraction of hops were chosen as activated bio-carbons precursor. The actual adsorbent was prepared by physical activation of the starting material. Some amount of the activated bio-carbon was divided into two parts. One of them was washed with distilled water, while the other part of the activated bio-carbon was washed first with a 5% solution of...

Removal of 2,4-D herbicide from aqueous solution by aminosilane-grafted mesoporous carbons

2,4-Dichlorophenoxyacetic acid (2,4-D) is the most commonly used herbicide in plant protection products. 2,4-D is poorly biodegradable and it is often found in aquatic environment. The development of an effective way to reduce the amount of this toxic contaminant from aqueous solution became an urgent issue. Therefore, in this study series of aminosilane-grafted mesoporous...

Application of microwave heating in the preparation of functionalized activated carbons

A series of modified carbonaceous materials has been obtained via nitrogenation, oxidation and thermal treatment of peat-based activated carbons with the use of microwave heating. In order to obtain materials characterised by diverse functional groups content, both in terms of the type and quantity, the starting material was subjected to four different treatment: (1) oxidation...

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

A TiO2–ZnO binary oxide system (with molar ratio TiO2:ZnO = 8:2) was synthesized by a hydrothermal method, assisted by calcination at temperatures of 500, 600 and 700 °C, using zinc citrate as the precursor of ZnO. The morphology (SEM, TEM), crystalline structure (XRD, Raman spectroscopy), diffuse reflectance spectra (DRS), chemical surface composition (EDXRF), porous structure...

Adsorption of monoterpene alcohols at the water–air interface

The measurements of the surface tension of aqueous solutions of 10 monoterpene alcohols, MAs: (−)-β-citronellol, geraniol, tetrahydrolinalool, linalool, (−)-menthol, (−)-terpinen-4-ol, p-cymene-8-ol, α-terpineol, isoborneol and (−)-borneol were made at T = 293 K. On the basis of the obtained results the values of the adsorption constant, the excluded area per molecule at the...

Evaluation of sorption capabilities of biopolymeric microspheres by the solid-phase extraction

This study presents the sorption capabilities of biopolymeric microspheres with commercial kraft lignin. The suspension-emulsion polymerization method was employed to obtain microspheres in spherical forms. Before copolymerization lignin was modified with methacryloyl chloride to increase its affinity for monomers. Two different types of microspheres (hybrid and non-hybrid) with...

Adsorption of Ba2+ ions at the hydroxyapatite/NaCl solution interface

The study of the kinetics of barium adsorption at the hydroxyapatite/electrolyte interface using the radioactive isotope 133Ba2+ was carried out. The course of adsorption kinetics indicates that at the beginning adsorption proceeds quickly and then slowly. Such adsorption kinetics is best described by the multiexpotential equation. The adsorption of Ba2+ ions at the...

Analysis of structure and properties of DVB–GMA based porous polymers

Polar porous polymeric microspheres divinylbenzene–glycidyl methacrylate (DVB–GMA) were synthesized with a suspension method. Two kinds of polymers differing in chemical composition and physical properties were obtained. The molar ratios of monomers in the polymers were 50:50 and 75:25, respectively. Next, the prepared materials were chemically treated with phosphoric or...

Influence of nonionic surfactants and water activity on to adsorption of 6-thioguanine at the mercury/chlorates(VII) interface

The mixed adsorption layers of 6-thioguanine-TritonX-100 and 6-thioguanine-Tween 80 formed at the electrode/chlorate(VII) interface are discussed. The systems were characterized by measurements of differential capacity, zero charge potential, and surface tension at this potential. It was found that 6-thioguanine dominates in the formation of adsorption equilibria of the studied...

Stability of coordination polymers in water: state of the art and towards a methodology for nonporous materials

A mini review on the study concerning water stability of coordination polymers (CPs) is presented. Next, following the procedure proposed recently by Gelfand and Shimizu (Dalton Trans 45:3668–3678, 2016) the stability of three cysteine (Cys)—containing CPs is investigated. The stability of studied CPs decreases in the order: Zn(Cys)2 > Mg(Cys)2 > Ca(Cys)2 H2O. For the latter...

Modeling of the 2D self-assembly of tripod-shaped functional molecules with patchy interaction centers

Surface-confined self-assembly of star-shaped functional molecules has been recently recognized as a promising method to fabricate extended superstructures with predefined architectures and physico-chemical functions. In this work we use the Monte Carlo (MC) method to explore 2D self-assembly of rigid tripod-shaped tectons equipped with patchy interaction centers located at the...

Comparison of adsorption affinity of anionic and cationic polyacrylamides for montmorillonite surface in the presence of chromium(VI) ions

Erosion, which is considered to be global problem, is the process of soil environment degradation due to the impact of wind (soil blowing, deflation) and water (soil washing, deep erosion). This leads to destruction of its structure, nutrients removal and finally bedrock exposition and desertification. One of the ways to prevent this phenomenon is the soil conditioners usage...

A reference high-pressure CO2 adsorption isotherm for ammonium ZSM-5 zeolite: results of an interlaboratory study

This paper reports the results of an international interlaboratory study led by the National Institute of Standards and Technology (NIST) on the measurement of high-pressure surface excess carbon dioxide adsorption isotherms on NIST Reference Material RM 8852 (ammonium ZSM-5 zeolite), at 293.15 K (20 °C) from 1 kPa up to 4.5 MPa. Eleven laboratories participated in this exercise...

Computational study of the CO adsorption and diffusion in zeolites: validating the Reed–Ehrlich model

Molecular simulations have been employed to explore at the microscopic scale the adsorption of CO in zeolites (MFI, CHA and DDR). On the basis of classical force fields, grand canonical Monte Carlo simulations are performed to predict the adsorption properties (isotherms) of these types of zeolites up to high pressure. Subsequent careful analysis yields details the microscopic...

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

The adsorption process at near ambient temperatures indicated that the EEC (enthalpy–entropy compensation) is affected by three basic thermodynamic values: ∆H, ∆S and T. The consequence is that it is possible to determine an isosteric straight (symbol H − S) without experimental studies based on the slope coefficient T iso , which is the constant arising from the expected...

Net, excess and absolute adsorption in mixed gas adsorption

The formulation of a thermodynamic framework for mixtures based on absolute, excess or net adsorption is discussed and the qualitative dependence with pressure and fugacity is used to highlight a practical issue that arises when extending the formulations to mixtures and to the Ideal Adsorbed Solution Theory (IAST). Two important conclusions are derived: the correct fundamental...

Characterization of hard coal properties applying multiple sorption model with parameters determined from qualitative approach to adsorption mechanism identification

This paper presents results of research on modeling of a coal structure and sorption system properties. Investigations combine a viewpoint on surface heterogeneity, coming from approach aimed at adsorption mechanism identification, when applied to real coal structure in multiple sorption model (MSM) simulations. For imaging of surface heterogeneity in real coal structure two...

Designing micro- and mesoporous carbon networks by chemical activation of organic resins

Carbon xerogels with ultrahigh micro- and mesopore volumes were synthesized from the activation of polymeric resins prepared by sol–gel polycondensation of resorcinol/formaldehyde mixtures in basic medium and subcritical drying. Various activating conditions (e.g., agent, temperature, impregnation conditions) were used and it was found that the textural features of the resulting...

Probing adsorption on a nanoscale: field desorption microspectroscopy

Combining an energy analyzer with a field ion microscope equipped with a probe-hole which corresponds to just few atomic surface sites, spatially resolved energy analysis of ions field desorbed from the adsorbent surface is possible on a nm-scale. The experimentally measured values of the kinetic energy of field ions can be related (by means of a thermionic cycle) to the...

Techniques for direct experimental evaluation of structure–transport relationships in disordered porous solids

Determining structure–transport relationships is critical to optimising the activity and selectivity performance of porous pellets acting as heterogeneous catalysts for diffusion-limited reactions. For amorphous porous systems determining the impact of particular aspects of the void space on mass transport often requires complex characterization and modelling steps to deconvolve...