Chen Jie, Liu Junjie, Zhang Ze, Wang Jing, Bi Shiming, Tang Xiaojun, Huang Zhujian
Key Laboratory of Environment and Safety Technology of Transportation Infrastructure Engineering, CCCC, CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou, 510230, China.
The Seventh Engineering Company of CCCC Fourth Harbor Engineering Co., Ltd, Guangzhou, 510230, China.
Environ Sci Pollut Res Int. 2025 Feb;32(9):5132-5142. doi: 10.1007/s11356-025-35894-7. Epub 2025 Feb 5.
This study presents a novel green approach for the preparation of zeolite material from fly ash using a combination of mechanochemical methods. The physicochemical properties of the synthesized zeolite, including crystal structure and porosity, were systematically investigated. The synthesized zeolite was employed for the adsorption of ammonia nitrogen from aqueous solutions, and their adsorption kinetics and thermodynamics were comprehensively studied. The results revealed that the adsorption of ammonia nitrogen onto the zeolite follows the Langmuir adsorption model. Additionally, the zeolite exhibited strong selective adsorption and remarkable resistance to interference from coexisting cations in the aqueous solution. Finally, regeneration experiments were conducted using NaCl, NaClO, and their mixtures to desorb ammonia nitrogen from the spent zeolite. A total of 17 regeneration cycles were performed until the adsorption capacity of the zeolites was exhausted. The adsorption performance of the regenerated zeolite was evaluated to assess the impact of different reagents and regeneration cycles on adsorption efficiency. The optimal regeneration method was identified, leading to the successful valorization of fly ash into zeolite for ammonia adsorption and the development of effective regeneration strategies for spent zeolite.
本研究提出了一种利用机械化学方法组合从粉煤灰制备沸石材料的新型绿色方法。系统研究了合成沸石的物理化学性质，包括晶体结构和孔隙率。将合成的沸石用于从水溶液中吸附氨氮，并全面研究了其吸附动力学和热力学。结果表明，氨氮在沸石上的吸附遵循朗缪尔吸附模型。此外，该沸石表现出强烈的选择性吸附，并且对水溶液中共存阳离子的干扰具有显著抗性。最后，使用NaCl、NaClO及其混合物进行再生实验，以使废沸石中的氨氮解吸。总共进行了17个再生循环，直到沸石的吸附容量耗尽。评估再生沸石的吸附性能，以评估不同试剂和再生循环对吸附效率的影响。确定了最佳再生方法，从而成功地将粉煤灰转化为用于氨吸附的沸石，并开发了有效的废沸石再生策略。
