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| 改性LTA沸石快速吸附水溶液中Cs+的研究 |
| Study on the Rapid Adsorption of Cs+ in Aqueous Solution by Modified LTA Zeolite |
| 投稿时间：2025-05-07 修订日期：2025-05-10 |
| DOI： |
| 中文关键词: 分级LTA沸石 制备 吸附 铯 |
| 英文关键词:hierarchical LTA zeolite synthesis adsorption cesium |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）, |
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| 中文摘要: |
| 137Cs是放射性废水中必须去除的核素之一。本文通过DADMAC改性制备了一种分级孔结构的LTA沸石（JLTA），Cs+的吸附效率得到显著提高。通过XRD、SEM和BET等表征发现DADMAC的疏水端构造了JLTA的介孔结构同时保留了原有的微孔孔道。通过考察JLTA在不同pH、投加量、接触时间和初始浓度下对Cs+的吸附性能，得到了最佳吸附条件（pH=6、投加量为5 g/L、t>5 min）。结合动力学模型、吸附等温线模型和相关表征结果发现JLTA对Cs+是以离子交换为主、静电吸引为辅的单层吸附，孔道内部的扩散控制着整个吸附过程，在5 min左右即可达到吸附平衡，其最大吸附容量为297.389 mg/g。 |
| 英文摘要: |
| 137Cs is one of the radionuclides that must be removed from radioactive wastewater. In this study, a hierarchically porous LTA zeolite (JLTA) was prepared via dimethyldiallylammonium chloride (DADMAC) modification, which significantly enhanced the adsorption efficiency of Cs?. Characterizations including XRD, SEM, and BET analysis revealed that the hydrophobic groups of DADMAC introduced mesopores into JLTA while retaining its inherent micropores. The adsorption performance of JLTA for Cs? was investigated under varying pH, dosage, contact time, and initial concentration, with optimal conditions identified at pH 6, a dosage of 5 g/L, and contact time >5 min. Kinetic and isotherm models, combined with characterization results, indicated that Cs? adsorption on JLTA primarily followed a monolayer mechanism dominated by ion exchange, supplemented by electrostatic attraction. The adsorption process was controlled by intra-particle diffusion, reaching equilibrium within approximately 5 min, and achieved a maximum capacity of 297.389 mg/g. This work highlights the potential of JLTA as an efficient adsorbent for rapid Cs? removal in radioactive wastewater treatment. |
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