Determination of Zeolite NaA (LTA) Synthesis Parameters from Technogenic Silica Gel for Water Softening

IF 2.8 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Silicon Pub Date : 2024-10-14 DOI:10.1007/s12633-024-03177-4

Igor N. Pyagay, Yana A. Svakhina, Marina E. Titova, Victoria R. Dronova, Vladimir V. Miroshnichenko

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引用次数: 0

Abstract

Utilization of fluoride-containing waste from aluminium fluoride production is an important strategic issue. Here, we use technogenic silica gel containing about 30 wt. % of fluoride and aluminum for zeolite NaA (LTA) synthesis. The process consists of two steps: silica gel acid purification up to a silica content of 95 wt. % and hydrothermal synthesis. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy were used for phase identification and synthesis conditions optimization. As a result, we determined that hydrothermal synthesis from aluminosilicate gel with molar ratios SiO₂:Al₂O₃ = 1.8, Na₂O:Al₂O₃ = 4.0, and H₂O:SiO₂ = 50 at 95 °C for 60 min with vigorous stirring yields zeolite NaA with Ca²⁺ and Mg²⁺ ion exchange capacities of 562.6 and 187.5 mEq/100 g respectively and water vapor capacity of 25.8 g/100 g. Thus, the developed process offers waste silica gel utilization and production of zeolite NaA, which is as good as commercial analogs.

Graphical Abstract

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从用于软化水的技术硅胶中确定沸石 NaA（LTA）的合成参数

利用氟化铝生产过程中产生的含氟废料是一个重要的战略问题。在这里，我们使用含约 30% 氟和铝的技术硅胶来合成沸石 NaA (LTA)。该工艺包括两个步骤：硅胶酸提纯至二氧化硅含量达到 95 重量%，以及水热合成。我们使用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和傅立叶变换红外光谱 (FTIR) 进行相鉴别和合成条件优化。结果表明，以摩尔比为 SiO2:Al2O3 = 1.8、Na2O:Al2O3 = 4.0 和 H2O:SiO2 = 50 的硅酸铝凝胶为原料，在 95 ℃、剧烈搅拌 60 分钟的条件下进行水热合成，可得到 Ca2+ 和 Mg2+ 离子交换容量分别为 562.6 和 187.5 mE2 的沸石 NaA。因此，所开发的工艺可以利用废硅胶并生产出沸石 NaA，其性能不亚于商业同类产品。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Silicon CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.90

自引率

20.60%

发文量

685

审稿时长

>12 weeks

期刊介绍： The journal Silicon is intended to serve all those involved in studying the role of silicon as an enabling element in materials science. There are no restrictions on disciplinary boundaries provided the focus is on silicon-based materials or adds significantly to the understanding of such materials. Accordingly, such contributions are welcome in the areas of inorganic and organic chemistry, physics, biology, engineering, nanoscience, environmental science, electronics and optoelectronics, and modeling and theory. Relevant silicon-based materials include, but are not limited to, semiconductors, polymers, composites, ceramics, glasses, coatings, resins, composites, small molecules, and thin films.