A Supramolecular Organic Framework for Iodine Capture from Vapor and Solution

Area of Science:

• Materials Science
• Environmental Chemistry
• Supramolecular Chemistry

Background:

• Iodine's volatility and diffusion pose significant environmental and health risks.
• Developing efficient iodine capture materials is a critical research priority.

Purpose of the Study:

• To synthesize and characterize a novel supramolecular organic framework (C1) for iodine adsorption.
• To investigate the iodine adsorption performance and mechanism of the C1 framework.

Main Methods:

• Synthesis of C1 using nor-seco-cucurbit[10]uril (ns-Q[10]), p-phenylenediamine (PPD), phenyl-pyridin-2-ylmethylamine (PPN), and [CdCl4]2-.
• Single-crystal X-ray diffraction for structural determination.
• Iodine adsorption experiments in vapor, n-hexane, and aqueous phases.

Main Results:

• The C1 framework demonstrated excellent iodine adsorption capacity (2.27 g·g-1 in vapor phase).
• Achieved over 95% iodine removal efficiency in n-hexane and aqueous solutions.
• X-ray diffraction confirmed the single-crystal structure of C1.

Conclusions:

• The C1 framework exhibits superior iodine adsorption capabilities due to abundant electron-donating groups (amino, carbonyl, aromatic).
• Iodine capture occurs via charge-transfer complex formation and electrostatic interactions.
• This study provides insights for designing advanced iodine adsorbents.