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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

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Metal-Organic Framework-Based Fiber Optic Sensor for Chromium(VI) Detection.

Swetha Menon¹, Sruthi Prasood Usha¹, Hariharan Manoharan¹

¹Biosensors Laboratory, Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600036, India.

|February 9, 2023

Summary

A new fiber optic sensor detects toxic hexavalent chromium (Cr(VI)) using a metal-organic framework (ZIF-67). This rapid and selective sensor offers a low detection limit for environmental monitoring.

Keywords:

U-bent fiber optic chemical sensor ZIF-67 heavy metal ion detection hexavalent chromium metal−organic frameworks

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$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

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Published on: March 13, 2013

Area of Science:

Materials Science
Analytical Chemistry
Environmental Science

Background:

Hexavalent chromium (Cr(VI)) poses significant environmental and health risks.
Accurate and rapid detection methods for Cr(VI) are crucial for water quality monitoring.
Existing detection methods can be time-consuming or lack selectivity.

Purpose of the Study:

To develop a novel fiber optic sensing strategy for selective and rapid detection of Cr(VI) ions.
To utilize a metal-organic framework (ZIF-67) for enhanced adsorption and detection sensitivity.
To evaluate the sensor's performance for real-world water sample analysis.

Main Methods:

Fabrication of U-bent fiber optic sensor (U-FOS) probes coated with zeolitic imidazolate framework (ZIF-67) via in situ deposition and heat treatment.
Utilizing evanescent wave-based absorbance sensitivity for Cr(VI) detection at 395 nm.
Testing selectivity against 14 other heavy metals and interfering ions.
Evaluating sensor performance using a compact light-emitting diode-photodetector setup.

Main Results:

The developed FOS/ZIF-67 probes demonstrated high sensitivity and selectivity for Cr(VI).
Achieved a low limit of detection (LOD) of 1 ppb and a wide linear dynamic range (0.005–100 ppm).
Exhibited a rapid response time of 5–10 minutes and good recovery rates in real water samples.
The sensors maintained a shelf-life of at least 4 weeks under ambient conditions.

Conclusions:

The novel fiber optic sensor (FOS/ZIF-67) provides a viable platform for selective and rapid Cr(VI) detection.
The sensor's performance indicates its potential for practical environmental monitoring applications.
This approach offers an efficient method for assessing water contamination by Cr(VI).