Thiophene-based covalent organic frameworks for highly efficient iodine capture

Xi Yan, Yixin Yang, Guorong Li, Jianhua Zhang, Yu He, Ran Wang, Zian Lin*, Zongwei Cai

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

21 Citations (Scopus)

Abstract

Development of adsorbent materials for highly efficient iodine capture is high demand from the perspective of ecological environment and human health. Herein, the two kinds of thiophene-based covalent organic frameworks (COFs) with different morphologies were synthesized by solvothermal reaction using thieno[3,2-b]thiophene-2,5-dicarbaldehyde (TT) as the aldehyde monomer and tri(4-aminophenyl)benzene (PB) or tris(4-aminophenyl)amine (PA) as the amino monomer (denoted as PB-TT COF and PA-TT COF) and the as-prepared two heteroatoms-rich COFs possessed many excellent properties, including high thermal stability and abundant binding sites. Among them, PB-TT COF exhibited ultra-high iodine uptake up to 5.97 g/g in vapor, surpassing most of adsorbents previously reported, which was ascribed to its high specific surface (1305.3 m2/g). Interestingly, PA-TT COF with low specific surface (48.6 m2/g) showed good adsorption ability for iodine in cyclohexane solution with uptake value of 750 mg/g, which was 2.38 times higher than that obtained with PB-TT COF due to its unique sheet-like morphology. Besides, the two COFs possessed good reusability, high selectivity and iodine retention ability. Based on experimental results, the adsorption mechanisms of both COFs were studied, revealing that iodine was captured by the physical-chemical adsorption. Furthermore, the both COFs showed excellent adsorption ability in real radioactive seawater treated safely, demonstrating their great potential in real environment.

Original languageEnglish
Article number107201
JournalChinese Chemical Letters
Volume34
Issue number1
Early online date6 Feb 2022
DOIs
Publication statusPublished - Jan 2023

Scopus Subject Areas

  • Chemistry(all)

User-Defined Keywords

  • Adsorption mechanisms
  • Iodine
  • Morphology
  • Radioactive seawater
  • Thiophene-based covalent organic frameworks

Fingerprint

Dive into the research topics of 'Thiophene-based covalent organic frameworks for highly efficient iodine capture'. Together they form a unique fingerprint.

Cite this