Tailoring Amine-Functionalized Ti-MOFs via a Mixed Ligands Strategy for High-Efficiency CO<sub>2</sub> Capture
Yinji Wan,
Yefan Miao,
Tianjie Qiu,
Dekai Kong,
Yingxiao Wu,
Qiuning Zhang,
Jinming Shi,
Ruiqin Zhong,
Ruqiang Zou
Affiliations
Yinji Wan
State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, No. 18 Fuxue Road, Changping District, Beijing 102249, China
Yefan Miao
State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, No. 18 Fuxue Road, Changping District, Beijing 102249, China
Tianjie Qiu
Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China
Dekai Kong
State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, No. 18 Fuxue Road, Changping District, Beijing 102249, China
Yingxiao Wu
Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China
Qiuning Zhang
State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, No. 18 Fuxue Road, Changping District, Beijing 102249, China
Jinming Shi
Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China
Ruiqin Zhong
State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, No. 18 Fuxue Road, Changping District, Beijing 102249, China
Ruqiang Zou
Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China
Amine-functionalized metal-organic frameworks (MOFs) are a promising strategy for the high-efficiency capture and separation of CO2. In this work, by tuning the ratio of 1,3,5-benzenetricarboxylic acid (H3BTC) to 5-aminoisophthalic acid (5-NH2-H2IPA), we designed and synthesized a series of amine-functionalized highly stable Ti-based MOFs (named MIP-207-NH2-n, in which n represents 15%, 25%, 50%, 60%, and 100%). The structural analysis shows that the original framework of MIP-207 in the MIP-207-NH2-n (n = 15%, 25%, and 50%) MOFs remains intact when the mole ratio of ligand H3BTC to 5-NH2-H2IPA is less than 1 to 1 in the resulting MOFs. By the introduction of amino groups, MIP-207-NH2-25% demonstrates outstanding CO2 capture performance up to 3.96 and 2.91 mmol g−1, 20.7% and 43.3% higher than those of unmodified MIP-207 at 0 and 25 °C, respectively. Furthermore, the breakthrough experiment indicates that the dynamic CO2 adsorption capacity and CO2/N2 separation factors of MIP-207-NH2-25% are increased by about 25% and 15%, respectively. This work provides an additional strategy to construct amine-functionalized MOFs with the maintenance of the original MOF structure and high performance of CO2 capture and separation.
