UiO-68-PT MOF-Based Sensor and Its Mixed Matrix Membrane for Detection of HClO in Water

Abstract

As an important type of reactive oxygen species (ROS), hypochloric acid (HClO) is closely linked with our daily life, and its convenient and rapid detection is very significant and imperative. Fluorescent and visual probes are being recognized as powerful and convenient tools for detection of ROS in the environment and living organisms by visualizing and imaging. In this contribution, a new metal–organic framework-based fluorescent probe UiO-68-PT, which was generated from a phenthiazine-decorated benzimidazole bridging dicarboxyl ligand and ZrCl4 under solvothermal conditions via in situ one-pot approach, is reported. The obtained UiO-68-PT features a unique HClO and Vitamin C-triggered reversible redox process, which is accompanied by both visual and fluorescence changes. Therefore, it can be a highly sensitive, specific, and reusable sensor to detect HClO species in water via both visual and fluorogenic observation (turn-on). Furthermore, its mixed membrane material (MMM) was fabricated by the combination of UiO-68-PT and poly­(vinyl alcohol), and the obtained hydrophilic MMM can be used as a reversible colorimetric card for visual detection of the HClO in aqueous solution.

Energy Transfer in Metal–Organic Frameworks for Fluorescence Sensing

“…After mixing UiO-68-PT MOF into poly(vinyl alcohol), the fabricated MMMs still exhibited excellent HClO detection performance in aqueous solution ( Figure 14 b). 171 Yan and co-workers reported a series of lanthanide LMOF thin films for the sensing of ammonia with low detection limits of 9 ppm. The linker of these LMOFs could combine with NH 3 via hydrogen bonds, which increased the triplet energy of the linker and had adequate energy transfer toward Eu 3+ ions.…”

“…(b) UiO-68-PT MOF-based MMMs for the sensing of HClO in aqueous solutions. Reprinted with permission from ref ( 171 ). Copyright 2019 American Chemical Society.…”

Post-Synthetic Modification of Zirconium Metal–Organic Frameworks for Adsorption and Separation of Light Hydrocarbons

“…According to the structure–effect relationship, functionalized MOFs are usually better at exploring its potential applications in industry and the real environment. At present, all sorts of MOFs had been used in gas adsorption and separation, , fluorescence and sensing, − catalysis, and other research fields. − Based on the excellent stability of Zr-MOFs, it is expected that Zr-MOFs can play a better role in practical applications. More and more chemists are devoted to the modification and synthesis of functional Zr-MOFs.…”

Cationic Metal–Organic Framework-Based Mixed-Matrix Membranes for Fast Sensing and Removal of Cr2O72− Within Water

“…Comparing to the harsh growth conditions and intrinsic fragility of pure MOF membranes, the incorporation of MOF particles into the polymer matrix to fabricate MOF-based mixed-matrix membranes (MMMs) is proved to be more competitive for realistic contaminant removal and sensing applications ( Zhang et al, 2012 ; Dong J. et al, 2020 ; Wu T. et al, 2020 ). The integration of these two components has the ability to combine the flexibility and processability of polymers with the excellent properties of MOFs ( Zhang et al, 2017 ; Li et al, 2019 ; Sousaraei et al, 2019 ; Chen et al, 2020 ; Muthukumaraswamy Rangaraj et al, 2020 ). Furthermore, the uniform distribution of MOF particles without aggregation within the polymers is beneficial for the sufficient interactions between MOFs and analytes ( Denny Jr and Cohen, 2015 ; Semino et al, 2016 ; Jiang et al, 2021 ).…”