Adsorption

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

List of Papers (Total 146)

n-Hexane conversion on γ-alumina supported palladium–platinum catalysts

Two series of Pd–Pt/Al2O3 catalysts, characterized by high metal dispersions were prepared and investigated in the reaction of n-hexane conversion at the temperature < 300 °C. Incipient wetness co-impregnation of γ-alumina with the solutions of Pd(acac)2 and Pt(acac)2 led to relatively good Pd–Pt alloying. However, a similar catalyst preparation using solutions of PdCl2 and...

Highly effective three-dimensional functionalization of graphite to graphene by wet chemical exfoliation methods

The paper presents results on the three-dimensional (3D) functionalization of graphite-originated flakes to graphene by carbonization of specific precursors in the presence of a hard template. In situ precipitated Na2CO3 nanocrystals or CaCO3 nano-powder were used as a hard template. Graphene flakes were obtained by a wet chemistry exfoliation of commercial graphite. The flakes...

Application of titania based adsorbent for removal of acid, reactive and direct dyes from textile effluents

In the present study, the titania based adsorbent (Adsorbsia As500) was used for removal of three textile dyes such as C.I. Acid Red 18, C.I. Reactive Blue 21 and C.I. Direct Yellow 50 from aqueous solutions. The dye sorption was investigated by the batch and column methods. The experimental data were analyzed by the Langmuir, Freundlich and Temkin models of adsorption. Adsorbsia...

Influence of mechanochemical treatment on thermal and structural properties of silica–collagen and hydroxyapatite–collagen composites

The paper presents the results of research on a series of composite materials based on hydroxyapatite, silica gel and collagen as biologically active substances. Their preparation was made using mechanical energy in accordance with the principles of “green chemistry”. Mechanochemical treatment was conducted in a planetary mill with different rotations of milling (200 and 400 rpm...

Influence of bridged monomer on porosity and sorption properties of mesoporous silicas functionalized with diethylenetriamine groups

Mesoporous organosilicas functionalized simultaneously with both pendant amine groups and ethylene/phenylene bridges, were synthesized to evaluate the effect of the bridges incorporated in the silica framework on the structure, porosity and adsorption properties of final materials. It turned out that the presence of the bridges enhanced the formation of porosity but adversely...

Adsorption mechanism of poly(vinyl alcohol) on the surfaces of synthetic zeolites: sodalite, Na-P1 and Na-A

The structure of poly(vinyl alcohol)—PVA layers adsorbed on the synthetic zeolites surfaces was determined. Three zeolites: sodalite, Na-P1 and Na-A were obtained using hydrothermal conversion of fly ash with aqueous sodium hydroxide. The effects of solution pH and zeolite type on the adsorption mechanism of the polymer were examined. The analysis of the results obtained by means...

Surface properties of graphene and graphene/diamond composites located at a substrate with tungsten carbide doped by metals composites

The basis of the obtained materials was 95% (wt%) tungsten carbide with the addition of about 4.75% Co 0.1% Nb and 0.15% Tl. During sintering flake graphene was added and in the case of the second sample also nano diamonds were added into the top layer. Surface properties of the obtained materials were determined by wettability. The apparent surface free energy was described...

Functional titania–silica/chlorophyllin hybrids: design, fabrication, comprehensive physicochemical characteristic and photocatalytic test

Chlorophyllin (which was used as sensitizer) was adsorbed onto a synthetic titania–silica oxide system, prepared via a sol–gel method. It was investigated how the adsorption process was affected by the initial concentration of chlorophyllin and the contact time of the solution. The physicochemical and structural properties of the inorganic support were comprehensively analyzed...

Structural, thermal and photocatalytic properties of composite materials SiO2/TiO2/C

In the study the mechanochemical treatment procedure was used to prepare composite materials based on SiO2 with the addition of TiO2 and carbon black as a carbon matter. The investigations were carried out at the three rotational speeds 300, 500 and 700 rpm. Thermal and structural characteristics of the composites were investigated using N2 adsorption, TG/DTG/DTA, SEM and FT-IR...

Application of krypton and nitrogen isotherms to characterisation of hydrophobized fine dispersional limestone material

The knowledge about the sorptive character of porous materials is important during their manufacturing, checking their quality and exploitation. In the case of hydrophobized materials such characterisation may be useful not only for description of porous structure but also for measurement of their hydrophobization degree. Two grain fractions of fine dispersional limestone of...

Copolymers of acrylate derivatives of diphenyl sulfone and divinylbenzene as materials of π-electron donor–acceptor properties

Optimalization of the synthesis of porous polymers of di(p-acrylphenyl)sulfone, (p-hydroxyphenyl-p-acrylphenyl)sulfone, and divinylbenzene is presented. Porous structure of the obtained copolymers were studied. Polymer of the most regular porous structure was chemically modified in order to obtain materials of π-electron donor–acceptor properties which can be applied as specific...

Influence of mechanochemical and microwave modification on ion-exchange properties of tin dioxide with respect to uranyl ions

Wet gel and dried xerogel of precipitated tin oxy-hydroxide were subjected to mechanochemical and microwave treatments (MChT and MWT, respectively). The prepared samples were studied using DTA-TG, XRD, FTIR, nitrogen adsorption–desorption. MChT and MWT cause improvement of crystal structure, removal of structural OH-groups and increase mesopores diameter as well as form the meso...

Synthesis and characterization of VP–DMN polymeric sorbents

Porous copolymers of 1-vinyl-2-pyrrolidone (VP) with 1,4-di(methacryloyloxymethyl) naphthalene (DMN) have been synthesized by suspension polymerization in the presence of inert diluent. They have different specific surface area and contain various amount of strongly polar pyrrolidone groups. Their sorptive properties have been studied using solution of p-chlorophenol. It was...

New strategy of controlled, stepwise release from novel MBioF and its potential application for drug delivery systems

Metal organic structures have gained recently an interest in many fields. Among them, metal–biomolecule framework materials with amino acids applied as organic linkers have attracted the growing attention. An application of tailored metal–biomolecule frameworks, easily decomposing in an acidic and/or reductive environment in a steerable way, is reported here. From these...

Comparison of physicochemical, sorption and electrochemical properties of nitrogen-doped activated carbons obtained with the use of microwave and conventional heating

A series of new nitrogen-doped activated carbons has been obtained via the reaction with urea and chemical activation of Polish brown coal. In order to obtain nitrogen groups bonded in different ways to the carbonaceous matrix, the modification with urea was performed at two different stages of processing, i.e. precursor or char. Additionally, the effects of conventional or...

Static sorption of heavy metal ions on ion exchanger in the presence of sodium dodecylbenzenesulfonate

The effect of sodium dodecylbenzenesulfonate (anionic surfactant) on removal of selected heavy metal ions such as copper(II), cobalt(II), zinc(II) and nickel(II) using Lewatit MonoPlus TP 220 were studied. The critical micellization of concentration in the system containing both heavy metal ions and the anionic surfactant was obtained (surface properties). The percentage removal...

The adsorptive properties of oxidized activated carbons and their applications as carbon paste electrode modifiers

The adsorptive properties of the Organosorb-10 activated carbons treated with different ozone doses (15 and 45 min) and their applications as carbon paste electrode (CPE) modifiers have been studied. As a target organic contaminant the 4-chlorophenol (4-CP) has been selected. Both the physical and chemical properties of the activated carbon surface were characterized and the...

Recovery of metals from waste nickel-metal hydride batteries using multifunctional Diphonix resin

In this study, Diphonix resin containing sulfonic, diphosphonic and carboxylic groups was used to evaluate the adsorption capacity of metal ions contained in the nickel-metal hydride batteries (Ni-MH). This type of ion exchanger can be considered as the multifunctional material having great affinity to many metal ions. Using Diphonix resin adsorption process was carried out for...

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...