Panek Rafał, Madej Jarosław, Bandura Lidia, Słowik Grzegorz
Department of Geotechnical Engineering, Civil Engineering and Architecture Faculty, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland.
Department of Chemical Technology, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University in Lublin, Maria Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland.
Materials (Basel). 2021 Mar 15;14(6):1413. doi: 10.3390/ma14061413.
Nowadays, using fly ash for zeolites production has become a well-known strategy aimed on sustainable development. During zeolite synthesis in a hydrothermal conversion large amount of post-reaction solution is generated. In this work, the solution was used as a substrate for Na-A and Na-X zeolites synthesis at laboratory and technical scale. Obtained materials were characterized using particle size analysis, X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), transmission electron microscopy (TEM), Fourier transformed infrared spectroscopy (FTIR), and nitrogen adsorption/desorption isotherm. Produced zeolites revealed high purity (>98%) and monomineral zeolitic phase composition. The SiO content was in the range 39-42% and 40-38%, whereas AlO content was 23-22% and 25-26% for Na-X and Na-A, respectively. TEM and BET analyses revealed Na-X zeolite pores were almost identical to commercial 13X with S in the range 671-734 m/g. FTIR indicated slight differences between materials obtained at laboratory and technical scale in Si-O-(Si/Al) bridges of the zeolitic skeleton. The results showed good replicability of the laboratory process in the larger scale. The proposed method allows for waste solution reusability with a view to highly pure zeolites production in line with circular economy assumptions.
如今，利用粉煤灰生产沸石已成为一种旨在实现可持续发展的知名策略。在水热转化合成沸石的过程中会产生大量的反应后溶液。在这项工作中，该溶液被用作实验室和工业规模合成Na-A和Na-X沸石的底物。使用粒度分析、X射线衍射（XRD）、X射线荧光光谱（XRF）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）和氮吸附/脱附等温线对所得材料进行了表征。所制备的沸石显示出高纯度（>98%）和单矿物沸石相组成。对于Na-X和Na-A，SiO含量分别在39-42%和40-38%范围内，而AlO含量分别为23-22%和25-26%。TEM和BET分析表明，Na-X沸石的孔与商业13X几乎相同，比表面积在671-734 m/g范围内。FTIR表明，在实验室规模和工业规模获得的材料在沸石骨架的Si-O-(Si/Al)桥方面存在细微差异。结果表明实验室过程在更大规模上具有良好的可重复性。所提出的方法允许废液再利用，以符合循环经济假设生产高纯度沸石。
