نتایج جستجو برای: smectites
تعداد نتایج: 240 فیلتر نتایج به سال:
Atrazine (A) is one of the most applied herbicides and has a negative impact on environment health. Density functional theory (DFT) experimental methods were used in study immobilization atrazine two smectites, montmorillonite (Mt) beidellite (Bd), as well their organically modified structures. Four systems examined: A-Mt A-Bd, structures by tetramethylphosphonium cation (TMP), A-TMP-Mt A-TMP-B...
The third set of locks the Panama Canal is one most impressive civil infrastructures in world. Its construction, however, was delayed by two years incurring cost overruns billions that were mainly related to use local basalt as raw material for concrete production. rapid degradation during construction an apparent sound resulted huge loss fines manufacturing concrete. In rock, olivine and glass...
Acid activation is a chemical modification of minerals and mainly smectites, in order to enhance their surface properties reinforce adsorption capacity for specific ions. Acid-activated clays and, more specifically, inorganic acid-activated calcium montmorillonites are used the bleaching process vegetable oils, which holding third place world food consumption after cereals rice, remove chloroph...
Opportunity has investigated in detail rocks on the rim of the Noachian age Endeavour crater, where orbital spectral reflectance signatures indicate the presence of Fe(+3)-rich smectites. The signatures are associated with fine-grained, layered rocks containing spherules of diagenetic or impact origin. The layered rocks are overlain by breccias, and both units are cut by calcium sulfate veins p...
-The adsorption and oxidation of 3,3',5,5'-tetramethyl benzidine (TMB) on hectorite has been investigated using X-ray powder diffraction, ultraviolet-visible spectroscopy, electron spin resonance, and infrared spectroscopy. The molecule adsorbed by cation exchange at low adsorption levels and oxidized to the monomeric radical cation (yellow). At higher adsorption levels, intercalation of TMB oc...
[1] The global-scale surface type 2 unit first identified with the Mars Global Surveyor Thermal Emission Spectrometer (TES) remains enigmatic. Competing hypotheses suggest that it represents either basaltic andesite or some form of altered basalt rich in dioctahedral smectite clay minerals and/or spectrally similar amorphous silica phases. Common dioctahedral smectites contain a diagnostic feat...
Abstract Layer charge is an important property of 2:1 phyllosilicates originating from isomorphic substitutions in the structure, vacancies octahedral sheet and unsatisfied bonds at edges crystals. It particular interest case smectites because it affects properties this mineral. Several methods have been proposed for determining layer smectites, namely structural formula method (SFM), alkylammo...
The unusual behaviour of smectites, the ability to change volume when wetted (swelling) or dried (shrinking), make soil containing smectites very unstable and hazardous for the building industry due to foundation movement and poor slope stability. These macroscopic properties are dominated by the structural arrangement of its finest fraction. In this work we show utilisation of a new technique ...
Nitroaromatic compounds enter the environment through their use as explosives, pesticides, solvents, and synthetic intermediates in the manufacturing of dyes, perfumes, and drugs. Recent studies have found that many nitroaromatic compounds are strongly retained by smectites, especially K+-saturated smectites. Sorption occurs when nitroaromatic compounds replace water associated with the clay an...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید