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Post-Synthetic Modification of Cd-MOF with Dual Emission as a Ratiometric Probe for Visual Detection.

Xiaomin Yang¹, Hongyan Zeng¹, Wenxi Zhang¹

¹School of Chemical and Environmental Engineering, Jilin Provincial Science and Technology Innovation Centre of Optical Materials and Chemistry, Jilin Provincial International Joint Research Center of Photo-Functional Materials and Chemistry, Changchun University of Science and Technology, Changchun 130022, PR China.

Inorganic Chemistry

|April 23, 2026

Summary

A novel metal-organic framework, Eu³⁺@CUST-1022, offers enhanced detection of heavy metal ions like Fe³⁺ and chromium species in water. This ratiometric fluorescence sensor provides lower detection limits and visual discrimination for environmental monitoring.

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Area of Science:

Materials Science
Environmental Chemistry
Analytical Chemistry

Background:

Heavy metal ions in water pose significant risks to ecosystems and human health.
Accurate and timely detection of these contaminants is crucial for environmental safety.
Existing detection methods may lack sensitivity or require complex procedures.

Purpose of the Study:

To synthesize a novel metal-organic framework (MOF) material for heavy metal ion detection.
To develop a ratiometric fluorescence sensor with improved sensitivity and selectivity.
To create a portable sensing system for practical environmental applications.

Main Methods:

Synthesis of CUST-1022 via solvothermal method.
Post-synthesis modification of CUST-1022 with Eu³⁺ to create Eu³⁺@CUST-1022.
Fabrication of a portable fluorescent sensor using cotton swabs.

Main Results:

Eu³⁺@CUST-1022 exhibited significantly lower detection limits for Fe³⁺ (8.63 μM), CrO₄^2- (1.26 μM), and Cr₂O₇^2- (1.91 μM) compared to pristine CUST-1022.
The sensing process involved a distinct color change, allowing for visual discrimination.
A portable sensor demonstrated effective direct detection of heavy metal ions in aqueous solutions.

Conclusions:

The developed Eu³⁺@CUST-1022 ratiometric fluorescence sensor offers a highly sensitive and selective method for detecting heavy metal ions.
Post-synthesis modification is an effective strategy for enhancing MOF-based sensor performance.
The portable sensor system presents a promising approach for on-site environmental monitoring.