School of Metallurgy, Northeastern University, Shenyang, 110819, China.
State Environmental Protection Key Laboratory of Eco-Industry, Northeastern University, Shenyang, 110819, China.
Environ Sci Pollut Res Int. 2023 Oct;30(46):102803-102817. doi: 10.1007/s11356-023-29648-6. Epub 2023 Sep 6.
The green synthesis method of fly ash-based NaA zeolite was explored to reduce the synthesis cost and environmental hazards. For the prepared NaA samples, the effects of crystallization time, solid-liquid ratio, and Si/Al ratio were systematically studied. CO adsorption isotherm is used for adsorption model fitting analysis and adsorption selectivity determination. According to the experimental results, the optimized NaA zeolite synthesis conditions are as follows: the Si/Al ratio of NaA zeolite is 1.4, the solid-liquid ratio is 10, and the crystallization time is 6 h. The green synthesis method reported in this study can successfully prepare NaA zeolite and exhibit excellent CO adsorption performance, reaching 4.34 mmol/g, with high CO selective adsorption ability, reaching 89.2 for N, 257.1 for O, and 45.8 for CH. The adsorbed CO can be released for further utilization, and NaA zeolite also has strong adsorption and regeneration performance, with a ten cycle adsorption capacity only decreasing by 1.17%. In addition, the use of cheap raw materials synthesis methods will promote the large-scale industry application of green synthesis technology in the future.
研究了以粉煤灰为原料的 NaA 沸石的绿色合成方法，以降低合成成本和减少环境危害。对所制备的 NaA 样品进行了结晶时间、固液比和硅铝比的系统研究。采用 CO 吸附等温线进行吸附模型拟合分析和吸附选择性测定。根据实验结果，优化的 NaA 沸石合成条件为：NaA 沸石的硅铝比为 1.4，固液比为 10，结晶时间为 6 h。本研究报道的绿色合成方法可以成功制备 NaA 沸石，并表现出优异的 CO 吸附性能，达到 4.34mmol/g，对 N、O 和 CH 的 CO 选择性吸附能力分别高达 89.2、257.1 和 45.8。吸附的 CO 可以释放出来以供进一步利用，并且 NaA 沸石还具有较强的吸附和再生性能，十次循环吸附容量仅下降 1.17%。此外，使用廉价的原材料和合成方法将促进绿色合成技术在未来的大规模工业应用。
