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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Functionalized Titanium-Based MOF for Cr(VI) Removal from Wastewater.

Yefan Qing¹, Wei Gao¹, Yantong Long¹

¹Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, P. R. China.

Inorganic Chemistry

|April 24, 2023

Summary

This study introduces a novel functionalized titanium-based metal-organic framework (MOF) for efficient removal of toxic hexavalent chromium (Cr(VI)) from water. The material simultaneously adsorbs and reduces Cr(VI) to less harmful Cr(III) species, meeting WHO drinking water standards.

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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance

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Published on: September 5, 2018

Area of Science:

Environmental Science
Materials Science
Chemistry

Background:

Hexavalent chromium (Cr(VI)) poses significant environmental and health risks.
Effective remediation strategies for Cr(VI) contamination are urgently needed.
Metal-organic frameworks (MOFs) offer tunable properties for environmental applications.

Purpose of the Study:

To develop a novel functionalized Ti-based MOF for enhanced Cr(VI) removal.
To investigate the simultaneous adsorption and reduction of Cr(VI) to Cr(III).
To evaluate the performance of the functionalized MOF under various conditions.

Main Methods:

Functionalization of MIL-125(Ti)-NH2 with amidoxime groups to create MIL-125(Ti)-AO.
Adsorption experiments to determine Cr(VI) adsorption capacity using Langmuir fitting.
Systematic investigation of parameters including pH, contact time, initial Cr(VI) concentration, and interfering ions.
Analysis of the synergistic adsorption mechanism involving [Ti-O] bonds and amidoxime groups.

Main Results:

The functionalized MIL-125(Ti)-AO demonstrated a high Cr(VI) adsorption capacity of 271 mg·g⁻¹.
Simultaneous reduction of Cr(VI) to Cr(III) was observed during the adsorption process.
Residual chromium concentrations in treated water fell below the WHO recommended limit of 0.05 mg·L⁻¹.
The material showed excellent performance across various experimental conditions and in the presence of competitive ions.

Conclusions:

MIL-125(Ti)-AO is a highly effective adsorbent for Cr(VI) removal from aqueous solutions.
The synergistic effect of adsorption and in-situ reduction by amidoxime groups is key to its performance.
This novel MOF presents a promising solution for environmental remediation of chromium-contaminated water.