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利用粉煤灰合成单相A型沸石及其表征

Synthesis and characterization of a single phase zeolite A using coal fly ash.

作者信息

Ren Xiaoyu, Xiao Lifeng, Qu Ruiyang, Liu Shaojun, Ye Dong, Song Hao, Wu Weihong, Zheng Chenghang, Wu Xuecheng, Gao Xiang

机构信息

State Key Laboratory of Clean Energy Utilization, Zhejiang University Hangzhou 310027 China

出版信息

RSC Adv. 2018 Dec 18;8(73):42200-42209. doi: 10.1039/c8ra09215j. eCollection 2018 Dec 12.

DOI:10.1039/c8ra09215j
PMID:35558779
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9092078/
Abstract

Zeolitization of coal fly ash (CFA) provides a potential alternative for creating high-added-value products from this hazardous solid waste. In this work, a single phase zeolite A with high crystallinity was successfully synthesized from CFA the alkali fusion hydrothermal method. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence (XRF), Fourier transform infrared (FT-IR) spectroscopy, N physisorption, and solid-state MAS NMR spectra were applied to characterize as-synthesized zeolites. Results indicated that the type and purity of zeolite were closely related to the synthesis conditions and parameters. A well-defined cubic shape of zeolite A with a specific surface area of 43.7 m g was obtained at a low temperature of 75 °C during hydrothermal treatment for 18 h. The ammonium cation exchange capacity (CEC) test showed an impressive value of 232.2 mmol 100 g over prepared zeolite A, which was about 22 times that of the original CFA and close to commercial zeolite A. These results pave the way for the exploitation and utilization of the CFA.

摘要

粉煤灰（CFA）的沸石化提供了一种从这种有害固体废物中制造高附加值产品的潜在替代方案。在这项工作中，采用碱熔水热法成功地从粉煤灰中合成了高结晶度的单相A型沸石。利用X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线荧光（XRF）、傅里叶变换红外（FT-IR）光谱、N物理吸附和固态MAS NMR光谱对合成的沸石进行了表征。结果表明，沸石的类型和纯度与合成条件和参数密切相关。在75℃的低温水热处理18 h后，获得了形状规整的立方体型A型沸石，其比表面积为43.7 m²/g。铵离子交换容量（CEC）测试表明，制备的A型沸石的CEC值高达232.2 mmol/100 g，约为原始粉煤灰的22倍，接近商业A型沸石。这些结果为粉煤灰的开发利用铺平了道路。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8f9a/9092078/cf40ea6489c1/c8ra09215j-f14.jpg
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