TY - JOUR
T1 - Thiophene-based covalent organic frameworks for highly efficient iodine capture
AU - Yan, Xi
AU - Yang, Yixin
AU - Li, Guorong
AU - Zhang, Jianhua
AU - He, Yu
AU - Wang, Ran
AU - Lin, Zian
AU - Cai, Zongwei
N1 - This work was supported by the Major Scientific and Technological Innovation Project of Shandong (No. 2021CXGC010705), and National Natural Science Foundation of China (Nos. 91843301, 22036001 and 21974021).
Publisher Copyright:
© 2022
PY - 2023/1
Y1 - 2023/1
N2 - 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.
AB - 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.
KW - Adsorption mechanisms
KW - Iodine
KW - Morphology
KW - Radioactive seawater
KW - Thiophene-based covalent organic frameworks
UR - http://www.scopus.com/inward/record.url?scp=85140800889&partnerID=8YFLogxK
U2 - 10.1016/j.cclet.2022.02.007
DO - 10.1016/j.cclet.2022.02.007
M3 - Journal article
AN - SCOPUS:85140800889
SN - 1001-8417
VL - 34
JO - Chinese Chemical Letters
JF - Chinese Chemical Letters
IS - 1
M1 - 107201
ER -
