Two isostructural aluminum-based metal − organic frameworks with multiple polar sites for reversible NH3 capture

IF 13.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL Chemical Engineering Journal Pub Date : 2025-03-15 DOI:10.1016/j.cej.2025.161602
Yaoqi Huang, Zhenliang Zhu, Min Zhang, Ge He, Shaojun Yuan
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Abstract

Efficient ammonia (NH3) capture is essential for both human health and environmental protection. Porous adsorbents play a crucial role in NH3 removal from polluted air, as reversible physical adsorption eliminates the need for solvents or water, thereby minimizing waste generation. The structural tunability and diversity of metal–organic frameworks (MOFs) make them promising candidates for NH3 uptake, however, developing stable and efficient MOFs for NH3 adsorption remains a big challenge. In this study, we developed two isostructural Al-MOFs, hydroxyl-functionalized CAU-1 (CAU-1-OH) and amino-functionalized CAU-1 (CAU-1-NH2), which featured specific polar sites and optimal porosity for efficient NH3 removal from air. At 25 ℃ and 1 bar, CAU-1-OH and CAU-1-NH2 achieved NH3 uptakes of 16.3 and 16.5 mmol g−1, respectively. Theoretical calculations reveal that the hydroxyl group in CAU-1-OH, the amino group in CAU-1-NH2, and the dense electronegative μ2-O group in both frameworks serve as high-density NH3 binding sites, playing a critical role in NH3 capture. Dynamic breakthrough experiments demonstrate the regeneration stability and excellent separation performance of these materials, highlighting their potential for cost-effective industrial applications in low-concentration NH3 removal from air.

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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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