Comparative Studies on CO2 Adsorption Performance of Different Morphologies of Silicalite-1 Zeolites Synthesized from Fly Ash

IF 3.3 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Silicon Pub Date : 2025-03-04 DOI:10.1007/s12633-025-03269-9

Xianglian Wu, Aisha Nulahong, Changmin Tuo, Jian Li, Fei Xu, Tiezhen Ren, Abulikemu Abulizi

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Abstract

Solid waste fly ash has a great impact on the environment and pollutes water, air and soil to different degrees. Therefore, it is of great significance to realize the high-value utilization of fly ash. In this paper, high purity SiO₂ was successfully extracted from fly ash by high temperature calcination, alkali fusion activation and pickling. Then silicalite-1 zeolite molecular sieves with different morphologies were synthesized using SiO₂ extracted from solid fly ash as silicon source. The influencing factors such as crystallization time, crystallization temperature, NaOH dosage, TPAOH dosage and different hydrosilica ratios were investigated separately. The results show that under the conditions of crystallization time of 12 h, crystallization temperature of 180 ℃ and molar ratio of water–silicon of 42, the prepared P-S (plate-like silicalite-1) has good morphology, high relative crystallinity and adsorption capacity of CO₂ of 1.89 mmol/g.When the molar ratio of TPA⁺/ SiO₂ was 0.28, the relative crystallinity of the prepared S–S (spherical-like silicalite-1) reached the highest and the adsorption capacity of CO₂ was 1.34 mmol/g.When the molar ratio of NaOH / SiO₂ was 0.11, C-S (cross-type Na-silicalite-1) can be prepared, and the adsorption capacity of CO₂ is only 1.06 mmol/g. The CO₂ adsorption capacities follow P-S > S–S > C-S. The research results can not only pave the way for high-value utilization of fly ash, but alao provide a valuable reference for zeolite-based adsorbents in the adsorption removal or recovery of CO₂.

Graphical Abstract

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粉煤灰合成硅-1沸石不同形态对CO2吸附性能的比较研究

固体废物粉煤灰对环境的影响很大，不同程度地污染了水、空气和土壤。因此，实现粉煤灰的高价值利用具有重要意义。本文通过高温煅烧、碱熔活化和酸洗，成功地从粉煤灰中提取出高纯SiO2。然后以固体粉煤灰中提取的SiO2为硅源，合成了不同形貌的硅-1分子筛。分别考察了结晶时间、结晶温度、NaOH用量、TPAOH用量和不同硅氢比等因素对结晶效果的影响。结果表明：在结晶时间为12 h、结晶温度为180℃、水硅摩尔比为42的条件下，制备的P-S（片状硅石-1）具有良好的形貌、较高的相对结晶度和1.89 mmol/g的CO2吸附量。当TPA+/ SiO2的摩尔比为0.28时，制备的S-S（球形硅石-1）的相对结晶度最高，对CO2的吸附量为1.34 mmol/g。当NaOH / SiO2的摩尔比为0.11时，可制得C-S（交叉型na -silica -1），对CO2的吸附量仅为1.06 mmol/g。CO2吸附量遵循P-S >； S-S > C-S。研究结果不仅为粉煤灰的高价值利用铺平了道路，也为沸石基吸附剂对CO2的吸附去除或回收提供了有价值的参考。图形抽象

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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.