Optimizing Hygroscopic Metal–Organic Frameworks via EDTA‐Mediated Structural Reinforcement and Photothermal Modification

IF 18.5 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Functional Materials Pub Date : 2024-11-16 DOI:10.1002/adfm.202416241

Mingren Cheng, Xin Lian, Haoyu Bai, Xinsheng Wang, Jian Xu, Moyuan Cao, Xian‐He Bu

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引用次数: 0

Abstract

Hygroscopic metal–organic frameworks (MOFs) are considered as superior moisture sorbents due to their highly adjustable and desired water adsorption/release performance, enabling effective atmospheric water harvesting (AWH) in arid regions. However, the water adsorption capacity, recycling stability, and functionality of current MOFs should be further improved to meet the requirements of practical AWH systems. Here the hydrophilicity at low relative humidity (RH) and cycling stability of MOF‐808 are simultaneously enhanced through the ethylenediaminetetraacetic acid (EDTA)‐mediated post‐modification. Based on the structural reinforcement, EDTA‐modified MOF‐808 (E‐MOF‐808) delivers a stable water uptake capacity of 0.39 g g−1 at 25% RH even after 50 water adsorption–desorption cycles, more than five times that of pristine MOF‐808. In addition, bridging by EDTA with the strong chelating ability, the E‐MOF‐808 can spontaneously capture Cu2+ for further functional improvement. Accordingly, light‐absorbing CuS nanoparticles can be in situ decorated on E‐MOF‐808 for facilitating solar‐driven water release. It is envisioned that this EDTA‐mediated function enhancement should provide valuable insights into the all‐in‐one design of versatile MOFs sorbents.

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通过 EDTA 介导的结构强化和光热修饰优化吸湿性金属有机框架

吸湿性金属有机框架（MOFs）因其高度可调和理想的吸水/释水性能而被认为是上佳的水分吸附剂，可在干旱地区实现有效的大气集水（AWH）。然而，目前 MOFs 的吸水能力、循环稳定性和功能性有待进一步提高，以满足实际大气集水系统的要求。在这里，通过乙二胺四乙酸（EDTA）介导的后修饰，MOF-808 在低相对湿度（RH）下的亲水性和循环稳定性同时得到了增强。在结构强化的基础上，EDTA修饰的MOF-808（E-MOF-808）在25%相对湿度条件下，即使经过50次吸水-解吸循环，也能提供0.39 g-1的稳定吸水能力，是原始MOF-808的五倍以上。此外，通过具有强螯合能力的 EDTA 桥接，E-MOF-808 还能自发捕获 Cu2+，进一步提高功能。因此，可以在 E-MOF-808 上原位装饰吸光的 CuS 纳米粒子，以促进太阳能驱动的水释放。预计这种由 EDTA 介导的功能增强将为多功能 MOFs 吸附剂的一体化设计提供宝贵的启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Functional Materials 工程技术-材料科学：综合

CiteScore

29.50

自引率

4.20%

发文量

2086

审稿时长

2.1 months

期刊介绍： Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.