نتایج جستجو برای: smectites

تعداد نتایج: 240  

Journal: :Minerals 2022

The aim of this study is to investigate the oxalic acid activation bentonites containing different types smectites, analyse their surface modification as a function concentration and create good quality bleaching earths. In particular, two bentonite samples (one aluminum one ferruginous smectite), after being characterized through XRD, XRF FT-IR analysis, are treated with at 0.5, 0.7 1 M. Their...

Journal: :Central European Geology 2021

Abstract Although the Mesozoic rocks of Transdanubian Range have been subject a multitude different studies, mineralogical research is largely underrepresented. The clay mineralogy Lower Jurassic (especially Pliensbachian and Toarcian) strata was broadly investigated earlier; however, systematic high-resolution studies remain scarce. Here we present study focusing on Upper Lókút-Hosszúárok sect...

Journal: :Journal of CO2 utilization 2021

The catalytic activity of Ni-bearing clay minerals obtained from natural nickel lateritic ores Niquelândia, Brazil was evaluated in methane dry reforming reaction at 800 °C. These phyllosilicates materials are Ni/Mg smectites with a Ni content about 23 wt %. mineralogy and the crystallochemistry were characterized using X-Ray diffraction FTIR spectroscopy respectively. Prior to any test, fracti...

Journal: :Journal Of Geophysical Research: Planets 2022

The Mars Reconnaissance Orbiter Compact Imaging Spectrometer for (CRISM) covers the spectral range from 0.362 to 3.92 ?m with a midafternoon local solar time data acquisition. For equatorial midlatitudes, depending on season and surface materials, wavelengths longer than ?2.65 exhibit radiances sensor that include sunlight thermal-emission related terms. We developed radiative transfer based ne...

Journal: :Journal of Chemistry 2022

Due to climate change and anthropogenic activities such as agriculture, mining, urbanization, water contamination has become a very real modern problem. Modern solutions activated carbon, reverse osmosis, ultrafiltration, among others, have been employed in the decontamination of water. These methods are, however, expensive set up maintain therefore proved challenge implement developing countri...

Journal: :Minerals 2022

The characterization of Mg-clays in rock samples (well P1) from the Barra Velha Formation (Early Cretaceous) allowed establishment mineral assemblages on basis their kerolite and Mg-smectite (stevensite saponite) content. Kerolite-rich (A B) rarely contain saponite. Assemblage B is composed kerolite-stevensite mixed layers, while assemblage A consists more than 95% kerolite. Mg-smectite-rich (C...

Journal: :Minerals 2021

The objective of this study is to describe the mineralogical composition and chemical properties Ora?u Nou bentonite, from northwestern Romania. For determinations, following were used: X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FR-IR), thermogravimetric analysis, scanning electron microscopy coupled with energy-dispersive (SEM-EDX). compositions physical bentonites bento...

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