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Linker-induced hollow MOF embedded into arginine-modified montmorillonite for efficient urea removal: Adsorption behavior and mechanism analysis
Sun, Wang1; Zha, Xiaoqian1; Lu, Shun2; Liu, Junyan1; Sun, Guorong1; Huang, Xiang1; Wang, Yang1
2025
摘要The precise regulation of hollow metal-organic framework (HMOF) and the effective assembly with excellent guest materials present limitless potential for pollutant removal. In this work, the arginine-modified montmorillonite (AMMT) was preferentially prepared via room temperature impregnation approach, and then the AMMT-HMOF composite was effectively constructed through a one-pot method. During this process, linker-induced MOF to MOF route was proposed, i.e., solid ZIF-67 transformed into hollow MOF-74 (thicknesses: similar to 25 nm). Of note, this route involves the transition from solid to hollow structures, as well as the change between different topologies. Next, the AMMT-HMOF composite was evaluated for adsorption experiments with urea in aqueous solution as the target molecule. Further speaking, the optimization experiments were conducted to analyze the impact of pH, contact time, adsorbent mass and original urea concentration towards the adsorption process. The as-fabricated absorbent presented a maximum adsorption capacity of 298.5 mg/g within 1 h, demonstrating adherence to pseudo-second-order kinetics and the Langmuir model. The excellent adsorption performance can be ascribed to the enlarged layer spacing of AMMT, as well as the fast mass transport and abundant diffusion channels in HMOF. Additionally, the mechanistic analyses revealed the existence of hydrogen bonding interactions between the adsorbent and urea. Meanwhile, the adsorbent displayed the outstanding morphological and structural stability after usage. According to our survey, this is the first time to use this linker-induced MOF-to-MOF strategy and predictably assemble with functionalized montmorillonite to construct the hollow MOF composite for urea adsorption.
关键词Hollow metal -organic framework Montmorillonite Adsorption behavior Urea removal
DOI10.1016/j.seppur.2024.128213
发表期刊SEPARATION AND PURIFICATION TECHNOLOGY
ISSN1383-5866
卷号352页码:11
通讯作者Lu, Shun(lushun@cigit.ac.cn) ; Wang, Yang(wangyzu@126.com)
收录类别SCI
WOS记录号WOS:001250589200001
语种英语