MOF-on-MOF Membrane with Cascading Functionality for Capturing Dichromate Ions and p‑Arsanilic Acid Turn-On Sensing

It is very significant that functional porous metal–organic frameworks are used to manufacture hierarchical components to achieve cascading functions that cannot be achieved by a single-layer metal–organic framework (MOF). Here, we report two cases of novel MOFs constructed by the same ligand, Cu­(I...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:ACS applied materials & interfaces 2020-12, Vol.12 (52), p.58239-58251
Hauptverfasser: Zhu, Ke, Fan, Ruiqing, Wu, Jingkun, Wang, Bowen, Lu, Haoyang, Zheng, Xubin, Sun, Tiancheng, Gai, Shuang, Zhou, Xuesong, Yang, Yulin
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:It is very significant that functional porous metal–organic frameworks are used to manufacture hierarchical components to achieve cascading functions that cannot be achieved by a single-layer metal–organic framework (MOF). Here, we report two cases of novel MOFs constructed by the same ligand, Cu­(I)-tpt and Cu­(II)-tpt (Htpt = 5-[4­(1H-1,2,4-triazol-1-yl)]­phenyl-2H-tetrazole), and prepared a Cu­(II)-tpt-on-Cu­(I)-tpt membrane by a layer-by-layer approach ignoring the lattice mismatch problem. The first Cu­(I)-tpt layer is grown on an oriented Cu2O nanostructured array by a “one-pot” approach. The aligned second Cu­(II)-tpt layer can be deposited using liquid-phase epitaxy. Notably, the prepared Cu­(II)-tpt-on-Cu­(I)-tpt membrane combines adsorption and fluorescence sensing, which exhibited significant adsorption for Cr2O7 2– (203.25 mg g–1) as typical highly poisonous ions with a fluorescence quenching response. Hence, based on the oxidation–reduction between Cr2O7 2– and p-arsanilic acid (p-ASA), the Cu­(II)-tpt-on-Cu­(I)-tpt membrane’s ability to adsorb Cr2O7 2– could be used to design “on-off-on” mode fluorescence probes to detect p-ASA with high sensitivity (limit of detection (LOD) = 0.0556 μg L–1). p-ASA can be degraded into highly toxic inorganic arsenic compounds in the natural environment and has received widespread attention. Therefore, the integration of adsorption and fluorescence properties makes the Cu­(II)-tpt-on-Cu­(I)-tpt membrane a feasible multifunctional material for pollution control and detection.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.0c17875