Hydrothermal synthesis of Mn–mica

Choi, Junho; Komarneni, Sridhar; Grover, Kanchan; Katsuki, Hiroaki; Park, Man

doi:10.1016/j.clay.2009.07.014

Cited by 8 publications

(11 citation statements)

References 8 publications

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“…In the XRD analysis it is observed based on the first characteristic peak of muscovite mica at 8.80° (2theta), basal spacing identified as d 001 correspond to 1.01 nm. Evaluation of basal spacing d 001 of such phyllosilicate incorporated into the coating did not evince modification (presenting the same value of 1.01 nm), indicating that it was not possible to identify neither exfoliation nor intercalation of the polymeric matrix into the mineral lamellae with such analysis [52][53][54] . The graph and values obtained in the XRD analysis are shown in Figure 8 and Table 4.…”

Section: Resultsmentioning

confidence: 97%

Effect of addition of clay minerals on the properties of epoxy/polyester powder coatings

et al. 2018

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Powder coatings have been used for coating metal substrates in industrial applications. The incorporation of nanofillers as muscovite mica and montmorillonite (MMT) can improve the properties of the coatings. The objective of this study is to develop, apply and characterize a hybrid powder coating (30% epoxy/70% polyester) adding nanofillers in concentrations of 2, 4 and 6 phr separately in a twin screw extruder. The characterization of the coatings was performed by thermal, mechanical and chemical analysis. The incorporation of clay into the polymer increased the surface roughness resulting in a diffuse reflection of incident light and on a gloss reduction. The muscovite mica presented a lamellar structure, constituted by a set of overlapping parallel plates. The morphology analysis showed that the MMT presented irregular agglomerates resulting in inferior mechanical properties to coatings with muscovite mica. In the salt spray test, all samples showed high corrosion protection, around 850 hours.

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Section: Resultsmentioning

confidence: 97%

Effect of addition of clay minerals on the properties of epoxy/polyester powder coatings

et al. 2018

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“…In fact, hendricksite has been recognized for the first time in stratiform hypogene deposits e.g., Franklin mine, Franklin, NJ, USA; [62], and in many Zn-bearing skarns [63], where it is derived from high temperature hydrothermal processes (T > 200 °C). These high temperatures have been corroborated by the unsuccessful attempts to synthesize Zn-and Mn-bearing micas at temperatures lower than 55 °C [32,64], which would be typical of a supergene environment (25 °C and 1 atm). Therefore, it is likely that also in the Cristal prospect hendricksite formed from hydrothermal fluids, which have emplaced also the sulfide mineralization.…”

Section: Discussionmentioning

confidence: 99%

Identification of Zn-Bearing Micas and Clays from the Cristal and Mina Grande Zinc Deposits (Bongará Province, Amazonas Region, Northern Peru)

et al. 2017

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Zn-bearing phyllosilicates are common minerals in nonsulfide Zn deposits, but they seldom represent the prevailing economic species. However, even though the presence of Zn-bearing clays is considered as a disadvantage in mineral processing, their characteristics can give crucial information on the genesis of the oxidized mineralization. This research has been carried out on the Mina Grande and Cristal Zn-sulfide/nonsulfide deposits, which occur in the Bongará district (Northern Peru). In both of the deposits, Zn-bearing micas and clays occur as an accessory to the ore minerals. The XRD analyses and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) investigations revealed that the Zn-bearing micas that are occurring in both deposits mostly consist of I/S mixed layers of detrital origin, which have been partly altered or overprinted by sauconite during the supergene alteration of sulfides. Sporadic hendricksite was also identified in the Cristal nonsulfide mineral assemblage, whereas at Mina Grande, the fraipontite-zaccagnaite (3R-polytype) association was detected. The identified zaccagnaite polytype suggests that both fraipontite and zaccagnaite are genetically related to weathering processes. The hendricksite detected at Cristal is a product of hydrothermal alteration, which is formed during the emplacement of sulfides. The complex nature of the identified phyllosilicates may be considered as evidence of the multiple processes (hydrothermal and supergene) that occurred in the Bongará district.

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“…The mica minerals are more common in igneous rocks, especially the intrusive type, and they have different chemical compositions and properties. In addition to the natural micas, synthetic micas of different compositions can be prepared by different techniques such as topotactic [1], hydrothermal [2] and solid state [3] methods. High pressure, temperatures, and long interaction times are the main drawbacks of these preparation methods [2].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the natural micas, synthetic micas of different compositions can be prepared by different techniques such as topotactic [1], hydrothermal [2] and solid state [3] methods. High pressure, temperatures, and long interaction times are the main drawbacks of these preparation methods [2]. Muscovite [KAl 3 Si 3 O 10 (OH) 2 ] is a dioctahedral Al-rich clay mineral and one of the dominant minerals of the mica family and phlogopite [KAlSi 3 Mg 3 O 10 (OH) 2 ] is a trioctahedral magnesium rich end member.…”

Section: Introductionmentioning

confidence: 99%

“…The interaction between manganese oxides and raw materials was recommended as a favorable strategy in maximizing the value of these natural sources for water remediation [18,19]. Manganese-rich minerals (i.e., manganese is present in the octahedral sheet of synthetic clays such as smectite [20] and mica [2,21]. Without the addition of manganese carbonate to a mixture of KOH and aluminosilicate, synthetic mica was not produced (i.e., MnCO 3 is essential to obtain mica) by hydrothermal treatment [2].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Theoretical Studies of Methyl Orange Uptake by Mn–Rich Synthetic Mica: Insights into Manganese Role in Adsorption and Selectivity

et al. 2020

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Manganese–containing mica (Mn–mica) was synthesized at 200 °C/96 h using Mn–carbonate, Al–nitrate, silicic acid, and high KOH concentration under hydrothermal conditions. Mn–mica was characterized and tested as a new adsorbent for the removal of methyl orange (MO) dye from aqueous solutions. Compared to naturally occurring mica, the Mn–mica with manganese in the octahedral sheet resulted in enhanced MO uptake by four times at pH 3.0 and 25 °C. The pseudo–second order equation for kinetics and Freundlich equation for adsorption isotherm fitted well to the experimental data at all adsorption temperatures (i.e., 25, 40 and 55 °C). The decrease of Langmuir uptake capacity from 107.3 to 92.76 mg·g−1 within the temperature range of 25–55 °C suggested that MO adsorption is an exothermic process. The role of manganese in MO selectivity and the adsorption mechanism was analyzed via the physicochemical parameters of a multilayer adsorption model. The aggregated number of MO ions per Mn–mica active site ( n ) was superior to unity at all temperatures signifying a vertical geometry and a mechanism of multi–interactions. The active sites number (DM) of Mn–mica and the total removed MO layers (Nt) slightly changed with temperature. The decrease in the MO adsorption capacities (Qsat = n·DM·Nt) from 190.44 to 140.33 mg·g−1 in the temperature range of 25–55 °C was mainly controlled by the n parameter. The results of adsorption energies revealed that MO uptake was an exothermic (i.e., negative ΔE values) and a physisorption process (ΔE < 40 kJ mol −1). Accordingly, the adsorption of MO onto Mn–mica was governed by the number of active sites and the adsorption energy. This study offers insights into the manganese control of the interactions between MO ions and Mn–mica active sites.

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Hydrothermal synthesis of Mn–mica

Cited by 8 publications

References 8 publications

Effect of addition of clay minerals on the properties of epoxy/polyester powder coatings

Effect of addition of clay minerals on the properties of epoxy/polyester powder coatings

Identification of Zn-Bearing Micas and Clays from the Cristal and Mina Grande Zinc Deposits (Bongará Province, Amazonas Region, Northern Peru)

Experimental and Theoretical Studies of Methyl Orange Uptake by Mn–Rich Synthetic Mica: Insights into Manganese Role in Adsorption and Selectivity

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