Preparation of crystalline Mg(OH)2 nanopowder from serpentinite mineral

Сирота, В. В.; Селеменев, В. Ф.; Ковалева, М. Г.; Pavlenko, O. Yu.; Mamunin, K. N.; Dokalov, V.; Yapryntsev, M. N.

doi:10.1016/j.ijmst.2017.12.018

Cited by 32 publications

(10 citation statements)

References 25 publications

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“…The highest occupied molecular orbitals (HOMO) of layered structure will be located on the edge as it is beneficial for the structure to attract ions and grow large along the edge. However, the chemical environment of H 2 TiO 3 is quite different from that of Mg(OH) 2 as the H 2 TiO 3 is obtained from acid system, which is enriched in H + ions. It means that, when the grain size A or B reaches a critical value, the growth along the edge of layered structure would no longer have significant advantages.…”

Section: Resultsmentioning

confidence: 99%

Mechanism of synthesis of anatase TiO₂ pigment from low concentration of titanyl sulfuric–chloric acid solution under hydrothermal hydrolysis

Tian

Liu

Wang

et al. 2019

J Chinese Chemical Soc

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In order to investigate the influence of Cl−/SO42− molar ratios and hydrolysis temperature on the hydrolysis process and TiO2 pigment, H2TiO3 was prepared with a low concentration of titanyl sulfuric–chloric acid solution by hydrothermal hydrolysis. Under the optimal hydrolysis conditions, 1.5–2.2 μm of H2TiO3 samples were achieved. After doping and calcination, anatase TiO2 pigments demonstrated excellent performance: the achromic ability of tinctorial strength (TCS) and blue phase index (SCX) were 1,429 and 4.07, respectively. As hydrolysis was a significant step in the process, the structure was simplified to a periodic structure of Ti[OH](H2O)3Cl(SO4) to simulate the cluster structures. Based on experimental results and density functional theory (DFT) calculation, the hydrolysis mechanism was presumed to be a process of anionic (OH−, Cl− and SO42−) competition reaction to explain the formation of anatase‐type H2TiO3, and the crystal growth direction of H2TiO3 was also confirmed to be a (OA) and b (OB).

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Section: Resultsmentioning

confidence: 99%

Mechanism of synthesis of anatase TiO₂ pigment from low concentration of titanyl sulfuric–chloric acid solution under hydrothermal hydrolysis

Tian

Liu

Wang

et al. 2019

J Chinese Chemical Soc

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“…Magnesium hydroxide may further be used as a precipitating agent in the treatment of effluents for removal of heavy metal ions. 33 Sirota et al 34 produced crystalline Mg(OH) 2 through the treatment of the serpentinite with nitric acid at temperatures close to 80 °C. The precipitation of Mg(OH) 2 occurred from the addition of concentrated ammonium hydroxide.…”

Section: Source Of Silica and Magnesiummentioning

confidence: 99%

Serpentinites: Mineral Structure, Properties and Technological Applications

Carmignano¹,

Vieira²,

Brandão³

et al. 2020

J. Braz. Chem. Soc.

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Serpentine is a versatile mineral family rich in Mg silicate with several polymorphic phases, mainly antigorite and lizardite, all of them with similar chemical composition (Mg 3 Si 2 O 5 (OH) 4 ). Their structures are generally composed of octahedral layers rich in Mg[MgO 2 (OH) 4 ] 6− , attached to a tetrahedral silicate [Si 2 O 5 ] 2− sheet. The unique physicochemical properties of serpentinites and the existence of large reserves in Brazil create new important opportunities for research and technological applications. In this work, serpentinites structures and properties are reviewed, as well as its occurrence and literature describing its applications in construction/ceramics, agriculture, as a silica source, in steel production, as an additive/filler in polymers, in the production of composites, adsorption of cations and organics contaminants, CO 2 capture and catalysis. The presence of harmful chrysotile associated with serpentinites, some of its properties and uses are also described.

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“…Various methods of Mg(OH) 2 synthesis have been developed, such as precipitation, solvothermal and hydrothermal processes, the sonochemical technique, the sol-gel, electrochemical and microwave methods, methods based on microemulsion and chemical vapour deposition [9][10][11][12]. Magnesium hydroxide can be obtained from a natural source like magnesite, serpentinite, dolomite, carnallite, mineral salt and seawater [13][14][15]. Seawater represents a significant reservoir and an inexhaustible source of magnesium.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of PLA composites with modified magnesium hydroxide obtained from seawater

Jozić

Jakić

et al. 2020

J Therm Anal Calorim

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Modification of poly(lactic acid) (PLA) was performed with the surface modified magnesium hydroxide (mMH) obtained from seawater. Surface modification of MH with different amount of stearic acid (SA) results in chemically bonded SA, stearate as confirmed by Fourier transform infrared spectroscopy (FT-IR). Based on FT-IR and X-ray diffraction (XRD) analysis modified filler with a higher amount of SA was used for the composite preparation. PLA/m10MH composites were prepared using laboratory mixing extruder. Differential scanning calorimetry (DSC) was applied to study thermal properties and crystallinity of PLA/mMH composites, while the thermal stability was performed by thermogravimetric analysis (TG). According to DSC analysis, PLA crystallization is primary influenced by the filler. PLA/m10MH composites degrade in four degradation stages. With an increase of m10MH content in the composites, their thermal degradation becomes more complex and their thermal stability is getting worse. XRD and X-ray microcomputed tomography (XμCT), used to obtain structural and microstructural information about PLA/m10MH composites, revealed that addition of m10MH decreases the crystallinity of PLA, increases the porosity of the composite and produces agglomeration of mMH.

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Preparation of crystalline Mg(OH)2 nanopowder from serpentinite mineral

Cited by 32 publications

References 25 publications

Mechanism of synthesis of anatase TiO₂ pigment from low concentration of titanyl sulfuric–chloric acid solution under hydrothermal hydrolysis

Mechanism of synthesis of anatase TiO₂ pigment from low concentration of titanyl sulfuric–chloric acid solution under hydrothermal hydrolysis

Serpentinites: Mineral Structure, Properties and Technological Applications

Preparation and characterization of PLA composites with modified magnesium hydroxide obtained from seawater

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Preparation of crystalline Mg(OH)2 nanopowder from serpentinite mineral

Cited by 32 publications

References 25 publications

Mechanism of synthesis of anatase TiO2 pigment from low concentration of titanyl sulfuric–chloric acid solution under hydrothermal hydrolysis

Mechanism of synthesis of anatase TiO2 pigment from low concentration of titanyl sulfuric–chloric acid solution under hydrothermal hydrolysis

Serpentinites: Mineral Structure, Properties and Technological Applications

Preparation and characterization of PLA composites with modified magnesium hydroxide obtained from seawater

Contact Info

Product

Resources

About

Mechanism of synthesis of anatase TiO₂ pigment from low concentration of titanyl sulfuric–chloric acid solution under hydrothermal hydrolysis

Mechanism of synthesis of anatase TiO₂ pigment from low concentration of titanyl sulfuric–chloric acid solution under hydrothermal hydrolysis