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The Long and Bright Path of a Lanthanide MOF: From Basics towards the Application
Author(s) -
Otal Eugenio Hernán,
Tanaka Hideki,
Kim Manuela Leticia,
Hinestroza Juan Paulo,
Kimura Mutsumi
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202005222
Subject(s) - lanthanide , x ray absorption fine structure , detection limit , potable water , materials science , substrate (aquarium) , aqueous solution , porosity , metal organic framework , phase (matter) , chemical engineering , nanotechnology , environmental science , chemistry , environmental engineering , composite material , spectroscopy , physics , ion , engineering , oceanography , organic chemistry , geology , chromatography , quantum mechanics , adsorption
The development of portable, reliable, and low‐cost sensors for assessing the quality of natural water sources is of high relevance in developing countries as they can serve as an intermediate solution prior to the building of permanent potable water distribution infrastructure. These sensors should be simple to operate by non‐trained operators and easy to manufacture locally. Lanthanide‐based metal–organic frameworks (MOFs) offer a trustable platform due to their intense emission in regions of the visible spectra and their high sensitivity to fluorides in water. Cotton was chosen as a substrate due to its high hydrophilicity which, together with the highly porous nature of the MOF, allows for shorter reaction times. The modified cotton was characterized by XRD, SEM as well as XAFS, hence probing the presence of [Tb(BTC) 6 (H 2 O)] (Tb‐BTC) attachment to cotton. Changes in the emission when Tb‐BTC modified cotton was exposed to water and aqueous fluoride solutions were monitored as a function of time. Crystalline phase changes were identified that correlated to structural information. Finally, the Tb‐BTC modified cotton was used to build a fluoride demonstrator sensor with a linear response of up to 10 mg L −1 and a limit of detection of 0.8 mg L −1 , making it suitable for drinking water analysis under international regulations.