Rajalakshmi, K. Muthusamy, S. Xie, M. NAM, YUN SIK Lee, Byeong hyeon LEE, KANG BONG Xu, Y. Xie, J. 2024-01-19T13:00:43Z 2024-01-19T13:00:43Z 2022-01-10 2022-02 1385-8947 https://pubs.kist.re.kr/handle/201004/115790 The accumulation of mercury in the food chain and environment is harmful to living beings. This raises the need for high affinity, reusable cost-efficient adsorbents for mercury. Herein, we report a side chain entanglement free hetero atom effect bearing covalent organic framework MTF prepared by integrating melamine and thiophene linker. The AA stacked MTF-2 was prepared via transformation strategy from its AB stacked MTF-1 congener. The MTF-1 and MTF-2 were comprehensively analyzed through PXRD, SEM, TEM, 13C CP/MAS, N2 sorption and mercury removal efficiency. The adsorption capacity of MTF-2 revealed a value of 540 mg g？1, which is greater than that of MTF-1 (328 mg g？1). The adsorption mechanism was studied through XPS, 13C CP/MAS and XAFS indicating probable coordination of Hg2+ with both the triazine and sulfur moieties in a cooperative manner. To demonstrate the role of aromatic triazine ring, the analogous aliphatic triaminoguanidine was selected and the removal efficiencies between triaminoguanidine-thiophene COF (TAG-TF) and MTF-2 were compared. It revealed that the triazine unit containing MTF-2 showed 2.2 times greater removal efficiency than TAG-TF. The results reveal the structure-performance relationship, where the high surface area and relatively ordered functional moieties both paly a synergistic role in efficient mercury adsorption. ？ 2021 Elsevier B.V. English Elsevier BV Fabrication of thiophene decorated side chain entanglement free COFs for highly regenerable mercury extraction Article 10.1016/j.cej.2021.133149 1 Chemical Engineering Journal, v.430 Chemical Engineering Journal 430 N scie scopus 000741178800004 2-s2.0-85119154580 Engineering, Environmental Engineering, Chemical Engineering Article COVALENT ORGANIC FRAMEWORKS ELEMENTAL MERCURY ACTIVATED CARBON HEAVY-METALS REMOVAL EFFICIENT ADSORPTION WATER IONS Covalent organic framework Crystalline covalent organic frameworks Mercury adsorption and removal Thiophene linker Triazine based covalent organic frameworks