Molecular dynamics simulations of water in contact with the (0 0 1) and (0 1 0) surfaces of orthoclase (KAlSi3O8) were carried out to investigate the structure and dynamics of the feldspar–water interface, contrast the intrinsic structural properties of the two surfaces, and provide a basis for...

In the past, time-resolved IR stimulated luminescence (TR-IRSL) curves from feldspar have mainly been measured over a few hundred μs with the purpose of estimating the lifetimes of the components. In this study, we present the decay form of time-resolved IRSL and IR stimulated phosphorescence (...

Adsorption of Rb+ and Sr2+ at the orthoclase (0 0 1)–solution interface is probed with high-resolution X-ray reflectivity and resonant anomalous X-ray reflectivity. Specular X-ray reflectivity data for orthoclase in contact with 0.01 m RbCl solution at pH 5.5 reveal a systematic increase in ele...

The pH- and temperature-dependent variations of the dissolution rates of orthoclase (0 0 1) surfaces in acidic aqueous solutions were examined in situ by using X-ray reflectivity and compared to density functional theory results. A phenomenological analysis of these data using the conventional r...

A new graphical method is described for assessing the degrees of alteration of orthoclase and albite feldspars to muscovite. The method uses major element data from whole rock samples, and given a range of samples of varying degrees of alteration, pathways of the alteration sequences may be dete...

A detailed analysis was undertaken of the X-ray photoelectron spectra obtained from microcline, orthoclase and several samples of plagioclase with varying Na/Ca ratio. Comparison of the spectra was made based on the chemical bonding and structural differences in the Al- and Si-coordination withi...

The uranium(VI) sorption onto orthoclase and muscovite, representing the mineral groups of feldspars and micas as important components of the earth crust, was investigated in the presence and absence of Ca2+ under aerobic conditions. Batch experiments were accompanied by time-resolved laser-indu...

The point load index test involves loading cylindrical, block or irregular rock samples between two conical platens until sample failure. The point load strength index (Is) determined using failure load and sample dimension is widely and variously used in engineering geological studies. Therefor...

The (001) orthoclase surface was dissolved at 180 °C and at far from equilibrium conditions with an alkaline solution (pH180 °C = 9) in a titanium open flow reactor. Vertical scanning interferometer (VSI) and atomic force microscope (AFM) surface monitoring were periodically used during the re...

In this work, natural zeolite chabazite was employed to obtain semiconductor composites by mixing with commercial and sol-gel processed, anatase phase TiO2 powders. The TiO2-chabazite semiconductor composites were prepared by mixing the powders and subsequently milling at high-energy or stirring...

Natural zeolite chabazite was studied for the discoloration of rhodamine 6G solutions in dark and under sunlight irradiation. The discoloration of rhodamine aqueous solutions containing chabazite was monitored by UV–vis absorption and photoluminescence spectroscopies and high-performance liquid...

Synthetic K+ chabazite (KCHA), Cs+ chabazite (CsCHA) and Zn2+ chabazite (ZnCHA) have been synthesized and investigated in order to relate the differences in their crystalline structures to their thermal stability, moisture content and frequency dependent alternating current (AC) conductivity, pe...

CHA zeolite (chabazite) crystals and membranes were prepared from organic structural directing agents-free (OSDA-free) gels. Chabazite membranes were grown on the tubular alumina supports. The effect of cesium and fluoride salts on the crystallization of chabazite crystals and membranes were inv...

Due to its shape selective properties, the narrow pore chabazite zeolite is an interesting material for the separation and purification of 1-butanol from ABE (acetone-butanol-ethanol) fermentation broth, as it selectively traps ethanol from the mixture of acetone, ethanol and butanol. In order t...

This study is aimed to shed light on the mechanisms at the basis of the differential penetration of alcohol and water in hydrophobic zeolites at ambient (Pamb) and non-ambient pressure. Here we report the effects of the penetration of water and alcohol in an all-silica chabazite (Si-CHA) compres...

In this study, clinoptilolite (CLN), mordenite (MOR) and chabazite (CHA) from Turkey and those of H+-, Na+-, K+-, Li+-, Ca2+- and Mg2+- exchanged forms were investigated for hydrogen storage at 77 K using volumetric apparatus up to 100 kPa. Cation exchange procedures were carried out using 1.0 M...

Mesoporous chabazite zeolites were prepared by using the cationic polymer polydiallyldimethylammonium chloride (PDADMAC) as template for mesopores and N,N,N-trimethyl-1-adamantammonium hydroxide as structure directing agent for the chabazite framework. The prepared zeolites had large surface are...

Isomorphous substitution of 3- and 4-valent heteroelements for Si is a practical approach to develop a zeolite catalyst with high activity and selectivity. Different nature of incorporated heteroatoms within the framework of the host zeolites makes the crystallization process challenging and tim...

The negatively charged surface of chabazite reduces its efficiency for the sorption of anionic species of radionuclides due to the repulsion force between the anionic species and the negative charge of chabazite surface. Therefore, this work focused on the modification of chabazite using N-methy...

Different zeolite nanostructures were synthesized from waste aluminum cans via a low-cost hydrothermal method using different silicon sources. The produced nanostructures were identified using XRD, FT-IR, SEM, and TEM analyses. XRD proved that the samples which synthesized using fumed silica and...