Recent advances in kaolinite-based material for photocatalysts
2021年9月1日 Kaolinite is very suitable for large-scale production and application of clay-photocatalyst composite materials due to its abundant natural reserves and mature
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Kaolinite Nanomaterials: Preparation, Properties and
2019年1月1日 So far, the research on the kaolinite/methanol complex has focused mainly on the following aspects: (a) Selection of the precursor for preparing kaolinite/methanol
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Effects of kaolinite layer expansion and impurities on the
2021年11月30日 Kaolinite, a layered aluminosilicate having the formula Al 2 Si 2 O 5 (OH) 4, is well-known as a raw material for the synthesis of various inorganic solids. 10–13
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Kaolinite structural modifications induced by mechanical
2023年6月15日 Abstract. This study presents novel characterisation techniques to evaluate the effects of mechanical activation (MA) on the kaolinite structure. MA was achieved
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Effects of bleaching and functionalization of kaolinite on the ...
2020年1月29日 Abstract. Polyamide 6 nanocomposites (PA6)/kaolinite were prepared by melt compounding. First, kaolinite was bleached via a solvothermal reaction using oxalic
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A role for subducted super-hydrated kaolinite in Earth’s
2017年11月20日 Recently, the existence of two high-pressure kaolinite polytypes was established 24: kaolinite I (the ambient polytype) transforms to kaolinite II near 3.7 GPa,
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Molecular Dynamics Modeling of Kaolinite Particle
We developed a new procedure for calculating finite-size kaolinite particles, their associations with complex surface chemistry, and the natural flexibility of sheets within a particle using a large-scale atomic/molecular
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Research and application of graphite oxide-assisted high
2022年10月1日 The interaction between graphene oxide and kaolinite was studied by density functional theory, indicating that the surface groups of graphene oxide and
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Kaolinite properties and advances for solid acid and basic
Interestingly, the use of kaolinite as precursor in active catalyst synthesis has been a breakthrough for several industrial processes such as petrol chemistry; especially in
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Adsorption of heavy metal from industrial wastewater onto
2020年2月8日 where q e is the amount of metal ions adsorbed onto the adsorbent at equilibrium (mg/g), C o and C e are the initial and equilibrium metal ion concentrations in the solution (mg/L), V is the volume of adsorbate (L) and m is the mass of the adsorbent (g).. Adsorption studies on wastewater samples. The adsorptions of heavy metals from
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Effects of kaolinite layer expansion and impurities on the
2021年11月30日 It is well known that kaolinite can undergo incomplete intercalation, 9 which is demonstrated by the continued presence of an XRD peak corresponding to a d value of 0.72 nm (due to the original kaolinite layers) following intercalation. The ratio of the intensity of the diffraction line due to expanded kaolinite layers to that of the line due to
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Kaolinite - an overview ScienceDirect Topics
Kaolinite is described as a 1:1 clay mineral consisting of two layers joined through an apical oxygen. One layer is known as the siloxane layer and consists of silicon tetrahedra joined in an hexagonal array. This layer is coupled to a gibbsite-like layer consisting of octahedral aluminium bonded to four OH units and two oxygen atoms.
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The Formation and Transformation of Manganese Oxide
2023年5月24日 The formation of manganese (Mn) oxides is influenced by environmental conditions and, in some red soils, Mn oxides occur as coatings on the surface of kaolinite particles in the form of colloidal films or fine particles. The present study aimed to explore the types of formation mechanisms of Mn oxide minerals on the surface of kaolinite. Mn
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Mineral Composition and Morphological Features of Kaolinite
2021年4月1日 Abstract This paper addresses for the first time the internal structure of lens 2 of the Shulepovo refractory clay deposit. The SEM study of representative samples from the entire lens section revealed relationships between the major minerals: kaolinite, halloysite, illite, and quartz. The lens was previously considered homogeneous, but its
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NEW INSIGHT INTO THE RELATIONSHIPS BETWEEN
2021年9月3日 The basic structural element in all kaolin-group minerals, which include kaolinite, dickite, nacrite, and halloysite, is a 1:1 layer of the composition Al 2 Si 2 O 5 (OH) 4 consisting of a tetrahedral sheet and an octahedral sheet linked together by a common plane of oxygens and hydroxyls. The defect-free structures of kaolinite, dickite, and
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Effects of bleaching and functionalization of kaolinite on the ...
2020年1月29日 The decomposition temperature of the TEOS-intercalated kaolinite is higher than the decomposition temperature of the CTAB-intercalated kaolinite, indicating that the hydrogen-bonded molecules (CTAB) are less thermally stable than the covalently bonded molecules (TEOS). 29 The weight losses of 10.2% around 474 °C for KC and of
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Hydrothermal alteration-related kaolinite/dickite occurrences
2020年9月30日 The kaolinite and dickite association with fine-grained alunite and jarosite point out the steam-heated igneous environments at shallow depth level. Hydrothermal alteration-related minerals occurred as replacement of volcanic glass/groundmass and neoformation in the pores from the acidic hydrothermal solutions. The mineralogical
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2023年9月1日 Modified kaolinites possess excellent adsorption properties and, therefore, are regarded widely as potential catalytic components. The use of modified kaolinites as a catalytic component for Fischer–Tropsch synthesis (FTS) has remained unexplored, however. In the current study, delaminated and pit-rich nano-kaolinite was prepared via
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The kaolinite shuttle links the Great Oxidation and Lomagundi events ...
2021年5月19日 Abstract. The ~2.22–2.06 Ga Lomagundi Event was the longest positive carbon isotope excursion in Earth’s history and is commonly interpreted to reflect perturbations in continental weathering ...
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Competitive adsorption of metal ions onto goethite–humic
2016年2月4日 A binary mixture of humic acid and geothite was prepared and used to modify kaolinite to produce geothite–humic acid (GHA)-modified kaolinite adsorbent useful for the adsorption of Pb2+, Cd2+, Zn2+, Ni2+ and Cu2+ from Single and Quinary (5) metal ion systems. The cation exchange capacity (CEC) and specific surface area of GHA
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Thermal decomposition of selected coal gangue Journal of
2017年9月20日 The thermal behavior of two mineral-type coal gangues under different temperature conditions was investigated by heating treatment of kaolinite-type coal gangue and illite-type coal gangue based on thermal analysis, X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM). Thermogravimetric,
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Synthesis, characterization and application of intercalated
2022年8月10日 In fact, for purified kaolinite, the adsorption of BY 28 was favored by the rise in temperature, reaching a maximum adsorbed quantity at 40 °C, which is 142.26 mg/g. This leaves us to suppose an endothermic effect. For K-CTAB 1D, we notice an increase in the amount adsorbed at equilibrium between 25 and 40 °C from 100.69 to 140.88 mg/g ...
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(PDF) Quantification of Kaolinite and Halloysite Using
2021年11月30日 Quantification of halloysite and kaolinite in clay deposits from X-ray diffraction (XRD) commonly requires extensive sample preparation to differentiate the two phyllosilicates. When assessing ...
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Dehydroxylation and Structural Distortion of Kaolinite as a
2019年9月27日 The furnace temperatures for coal combustion and waste incineration are 1200–1500 °C and 800–1200 °C respectively, indicating that kaolinite would change to meta-kaolinite and even mullite in the furnace according to the transformation temperature mentioned above [].According to the theoretical calculation, Wang et al. found that the
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The impact of calcite impurities in clays containing kaolinite
2020年4月16日 The use of supplementary cementitious materials as a partial replacement for Portland cement is the most effective way to reduce the carbon footprint of the concrete industry. Raw clays containing kaolinite (kaolin) are promising substitute materials. In the field, raw clays are often mixed with calcite and this is thought to affect their behaviour
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Estimating kaolinite crystallinity using near-infrared
2022年8月1日 Kaolinite is a 1:1 dioctahedral triclinic phyllosilicate [Al 2 Si 2 O 5 (OH) 4] (e.g., Bish 1993 and references therein). Kaolinite is the most common polymorph of kaolin-group minerals. It has two monoclinic polymorphs: dickite and nacrite that mainly form in diagenetic and hydrothermal contexts (Swindale 1975; Buatier et al. 1996; Beaufort et al.
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TiO2 nanoparticles assembled on kaolinites with different
2018年8月3日 Natural kaolinite clays with different dimensionalities (including kaolinite nanoflakes and nanorods) supported TiO2 nanoparticles were successfully prepared via a facile sol-gel method. Moreover ...
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Substituent Effects in Kaolinite Flotation Using Dodecylamine ...
2023年2月26日 The molecular structure of cationic surfactants is closely related to their flotation performance. In this paper, three cationic surfactants with different head group structures were selected as collectors of kaolinite, and the substituent effects were studied by the DFT method. The DFT calculation results showed that increasing the number of
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Evaluation and characterization of Egyptian ferruginous kaolinite
2020年2月7日 Raw ferruginous kaolinite was characterized as promising materials in the removal of safranin-O dye from water in comparison with fresh kaolinite. The studied samples were characterized utilizing different techniques including XRF, XRD, SEM, and optical polarized microscope. The sample appeared as highly crystalline kaolinite of
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