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Updated: Feb 26, 2026
Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
Published on: September 5, 2018
Designing atomically precise and robust covalent organic frameworks for enhanced iodine/iodate uptake: structures
Qianyi Zuo1, Xin Zheng1,2, Aokun Jia1
1MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China. jizhuoyu@ncepu.edu.cn.
Triphenylamine-based covalent organic frameworks (COFs) were designed for efficient iodine, iodide, and iodate removal. These novel materials demonstrate high adsorption capacities and reusability, offering a promising solution for environmental remediation.
Area of Science:
- Environmental Chemistry
- Materials Science
- Nanotechnology
Background:
- Iodine, iodide, and iodate are persistent environmental pollutants with significant health risks due to bioaccumulation.
- Existing methods for removing these pollutants often lack efficiency and reusability.
- Designing targeted adsorbents for iodine species remains a critical challenge in environmental remediation.
Purpose of the Study:
- To rationally design and synthesize novel triphenylamine (TPA)-based Schiff covalent organic frameworks (COFs) for effective iodine, iodide, and iodate removal.
- To investigate the influence of tailored phenol hydroxyl sites on the adsorption performance of COFs.
- To evaluate the efficiency, capacity, and reusability of the developed COFs for various forms of environmental iodine contamination.
Main Methods:
- Synthesis of TPA-based Schiff COFs with varying phenol hydroxyl group configurations (COF-BT, COF-TP, COF-Dha).
- Characterization of the synthesized COFs to confirm structure, stability, and functional groups.
- Adsorption experiments to quantify the removal capacity for iodine vapor, polyiodide, iodine-cyclohexane solutions, methyl iodide vapor, and iodate ions.
Main Results:
- The synthesized COFs exhibited excellent stability and high iodine uptake capacities.
- COF-Dha achieved remarkable adsorption capacities: 4.9 g/g for iodine vapor, 2.29 g/g for polyiodide, 1.26 g/g for iodine in cyclohexane, and 2.5 g/g for CH3I vapor.
- COF-Dha demonstrated effective redox activity for iodate (IO3-) removal with an adsorption capacity of 467 mg/g, facilitated by para-hydroxyl groups.
Conclusions:
- TPA-based COFs with tailored phenol hydroxyl sites show superior performance for removing diverse iodine species from the environment.
- The developed COFs offer high efficiency, capacity, and potential reusability for iodine/iodide/iodate remediation.
- This study provides a valuable reference for the rational design of advanced COF materials for environmental pollutant control.
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