Versatile Covalent Postsynthetic Modification of Metal Organic Frameworks via Thermal Condensation for Fluoride Sensing in Waters.

Eugenio Hernan Otal,Yu Kitazawa,Juan Paulo Hinestroza,Manuela Leticia Kim,Mutsumi Kimura,Yoshiyuki Hattori

doi:10.3390/bioengineering8120196

Eugenio Hernan Otal, Yu Kitazawa + Show 4 more

Open Access

https://doi.org/10.3390/bioengineering8120196

Copy DOI

Journal: Bioengineering	Publication Date: Nov 29, 2021
Citations: 4	License type: CC BY 4.0

Affiliation: Shinshu University, Cornell University

Abstract

Having access to safe drinking water is one of the 17 sustainable development goals defined by the United Nations (UN). However, many settlements around the globe have limited access to drinkable water due to non-anthropogenic pollution of the water sources. One of those pollutants is fluoride, which can induce major health problems. In this manuscript, we report on a post synthetic functionalization of metal organic frameworks for the sensing of fluoride in water. The proposed thermal condensation methodology allows for a high yield of functionalization using few steps, reducing reagent costs and generating minimal by-products. We identified a Rhodamine B functionalized Al-BDC-NH metal organic framework as one particularly suitable for fluoride detection in water.

Highlights

Access to safe drinking water is a goal of the 17 sustainable development goals defined by the United Nations (UN) [3]
We report on the post synthetic modification of Al-BDC-NH2 metal organic framework, and its potential use as a fluoride sensor in water samples
The signal at 162 ppm in the 13 C nuclear magnetic resonance (NMR) spectra indicates the formation of an amide bond, which is in agreement with the previously reported chemical shifts for this bond [26] (Figure 1d)

Summary

Introduction

Fluoride is an element of high interest for human health. Odor or taste, and high levels of fluoride in natural waters are mainly due to geological composition of riverbeds. This generates an inhomogeneous distribution of fluoride contents in the water sources of a certain area. One of the main areas on the planet affected by high concentrations of fluoride is the East African Rift Valley, where the concentrations of fluoride can reach up to 75 mg·L−1 [1], exceeding the recommended highest concentration of fluoride in drinking water by the World Health Organization of 1.5 mg·L−1 [2]. Access to safe drinking water is a goal of the 17 sustainable development goals defined by the United Nations (UN) [3]

Methods

Results

Discussion

Conclusion