Functionalization and Fabrication of Soluble Polymers of Intrinsic Microporosity for CO2 Transformation and Uranium Extraction

Anwang Dong

Tingting Dai 

Mengyao Ren

Xuemei Zhao

Shilei Zhao

Yihui Yuan

Qi Chen Email

Ning Wang Email

State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China

Abstract

Task-specific porous polymer PIM-1-based quaternary ammonium iodide (PIM-1-AI) with available catalytic site has been obtained by functionalization of the precursor polymer of intrinsic microporosity PIM-1 and used in the capture and fixation of CO2 . PIM-1-AI not only have the ability to capture CO2 (4.6 wt%, 273 K), but also can act as metal-free catalyst for CO2 conversion reaction without any co-catalyst to prepare various cyclic carbonates. The yields of the corresponding reactions catalyzed by PIM-1-AI range from 87 % to 99 % at 2.5 MPa and 90 oC. Furthermore, post-functionalization of PIM-1 has also been performed for the synthesis soluble PIM-1-based amidoxime (PIM-1-AO) with adsorbent groups and high BET specific surface area (511 m2 g-1). Given that the inevitable mass loss of solid powder absorbents in the process of recycling and reutilization for practical use, herein, solid powder PIM-1-AO was fabricated into film and foam-supporting monolithic adsorbents to meet the need of practical application for uranium uptake. We found that PIM-1-AO film has the highest uranium uptake ability (180.3 mg g-1) tested in real seawater with evaluated uranium (7.98 ppm) at the pH of 8.2 and room temperature. Foam-supporting PIM-1-AO can shorten the balanced time from 10 to 4 h in compare with PIM-1-AO powder. Moreover, both PIM-1-AO film and foam-supporting PIM-1-AO as integrated adsorbents can be reused at least 5 times and retain their mass stability

Functionalization and Fabrication of Soluble Polymers of Intrinsic Microporosity for CO2 Transformation and Uranium Extraction