沸石巴西膨润土制备绿锰矿石及表征

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth Pub Date : 2025-07-18 DOI:10.1016/j.jcrysgro.2025.128306

David Enrique Vega Porras, Rômulo Simões Angélica, Simone Patrícia Aranha da Paz

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引用次数: 0

摘要

以巴西膨润土（Verde Lodo）为原料，采用两步法合成了Malladrite （Na2SiF6）。该过程包括粘土的沸石化，然后在室温下选择性地溶解在富氟溶液中。通过x射线衍射rietveld细化（XRD）、傅里叶变换红外光谱（FTIR）、差示扫描量热/热重分析（DSC/TG）和扫描电子显微镜（SEM-EDS）对所得材料进行了表征。该工艺纯度为88%，收率为50%。所合成的绿草酸盐的结构和化学特征与使用纯化学试剂的常规方法所获得的相似。这种方法引入了另一种合成途径，并证明了使用天然粘土作为易获得的前体来合成高结晶和纯氟硅酸盐的可行性。

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Synthesis and characterization of malladrite from zeolitized brazilian bentonite

Malladrite (Na₂SiF₆) was synthesized from a commercial Brazilian bentonite (Verde Lodo) via a novel two-step route. The process involved zeolitization of the clay, followed by selective dissolution in a fluoride-rich solution at room temperature. The resulting material was characterized by X-ray diffraction–Rietveld refinement (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry/thermogravimetric analysis (DSC/TG), and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDS). The process achieved 88% purity and 50% yield. The synthesized malladrite exhibited structural and chemical features comparable to those obtained through conventional methods using pure chemical reagents. This approach introduces an alternative synthesis pathway and demonstrates the feasibility of using natural clays as accessible precursors for the synthesis of highly crystalline and pure fluorosilicates.

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来源期刊

Journal of Crystal Growth 化学-晶体学

CiteScore

3.60

自引率

11.10%

发文量

373

审稿时长

65 days

期刊介绍： The journal offers a common reference and publication source for workers engaged in research on the experimental and theoretical aspects of crystal growth and its applications, e.g. in devices. Experimental and theoretical contributions are published in the following fields: theory of nucleation and growth, molecular kinetics and transport phenomena, crystallization in viscous media such as polymers and glasses; crystal growth of metals, minerals, semiconductors, superconductors, magnetics, inorganic, organic and biological substances in bulk or as thin films; molecular beam epitaxy, chemical vapor deposition, growth of III-V and II-VI and other semiconductors; characterization of single crystals by physical and chemical methods; apparatus, instrumentation and techniques for crystal growth, and purification methods; multilayer heterostructures and their characterisation with an emphasis on crystal growth and epitaxial aspects of electronic materials. A special feature of the journal is the periodic inclusion of proceedings of symposia and conferences on relevant aspects of crystal growth.