粉煤灰/NaOH浆液滤液超声合成沸石及表征

IF 0.8 4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY
Tebogo M.A. Mokgehie, W. Gitari, N. Tavengwa
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引用次数: 3

摘要

对粉煤灰/氢氧化钠浆液的滤液进行了超声分析,以确定是否可以获得结晶沸石。以15 g/120 mL的固液比,在3 M NaOH中,50°C老化24 h,得到CFA/NaOH浆料。FT-IR研究表明,“Lo”频率超声沸石比“Hi”频率超声沸石具有更高的强度。在1066 cm、1400 cm和3600 cm处观察到与“Lo”型沸石相关的条带,分别为Si-O不对称拉伸、Al-O不对称拉伸、O-H弯曲和O-H不对称拉伸。经PXRD分析,超声沸石处理90 min后,沸石相强度最大。粉末x射线衍射研究表明,CFA中最初的石英和铝硅酸盐等相转化为gismodine分子筛Na-P1。随着超声时间的延长,可见形态学改变。在较短的超声时间内,观察到不规则形状的融合状颗粒结构,而在较长的超声时间内,分离的颗粒状结构更加明显。超声处理90 min沸石的能量色散x射线光谱研究表明,沸石中存在Na、O、Si和Al,它们是沸石的重要组成部分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synthesis and Characterization of Zeolites Produced by Ultrasonication of Coal Fly Ash/NaOH Slurry Filtrates
Studies were conducted to determine if crystalline zeolites could be obtained from the filtrates of coal fly ash (CFA)/NaOH slurries through sonication. The CFA/NaOH slurries were obtained by aging CFA in 3 M NaOH for 24 h at 50 °C using a solid/ liquid (S/L) ratio of 15 g/120 mL. FT-IR studies indicated that the ‘Lo’ regime ultrasonicated zeolite had higher intensities than that of the ‘Hi’ frequency ultrasonicated zeolite. The bands associated with the ‘Lo’ regime ultrasonicated zeolite were observed at 1066 cm, 1400 cm and 3600 cm, which were identified as Si-O asymmetric stretch, Al-O asymmetric stretch, O-H bend and O-H asymmetric stretch, respectively. Based on PXRD studies, the zeolitic phases were most intense for the 90 min ultrasonicated zeolite. Powder X-ray diffraction studies showed that the phases initially in CFA, such as quartz and aluminosilicate, were converted into gismodine zeolite Na-P1. Morphological changes were seen as ultrasonication period was increased. At short ultrasonication times, irregularly shaped fused-like grain structures were observed, while at longer times separate grain-like structures became more apparent. Energy dispersive X-ray spectroscopy studies on the 90 min ultrasonicated zeolite indicated the presence of Na, O, Si and Al, which were important building-blocks for the zeolites.
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来源期刊
CiteScore
3.10
自引率
0.00%
发文量
6
审稿时长
>12 weeks
期刊介绍: Original work in all branches of chemistry is published in the South African Journal of Chemistry. Contributions in English may take the form of papers, short communications, or critical reviews.
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