Citation: Yue Yong, Qian Zhiqi, Kong Fanan, Xiao Qin, Ren Shijie. Preparation and Adsorption Application Study of Fluorine-containing Conjugated Microporous Polymers[J]. Acta Chimica Sinica, ;2019, 77(6): 500-505. doi: 10.6023/A19020066 shu

Preparation and Adsorption Application Study of Fluorine-containing Conjugated Microporous Polymers

College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China

Corresponding author: Ren Shijie, rensj@scu.edu.cn
Received Date: 22 February 2019
Available Online: 17 June 2019
Fund Project: the National Natural Science Foundation of China 21404074the State Key Laboratory of Polymer Materials Engineering Sklpme2018-2-05the National Natural Science Foundation of China 21574087Project supported by the National Natural Science Foundation of China (Nos. 21574087, 21404074) and the State Key Laboratory of Polymer Materials Engineering (No. Sklpme2018-2-05)

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Water pollution arising from ever-growing domestic sewage and industrial organic pollutants has caused severe environmental and ecological problems in many parts of the world. It is urgent to seek appropriate ways to resolve oily wastewater and organic solvent pollution. Currently, physical adsorption is considered to be one of the most important methods to eliminate the oil contaminations in water thanks to its high efficiency and low cost. However, traditional adsorbent materials, such as activated carbon, zeolite and natural fibers, often suffer from low adsorption capacities, poor adsorption selectivity and recyclability. Thus, it is still of great importance to develop new absorbent materials for the separation and removal of oils or organic pollutants from water to address environmental issues. Conjugated microporous polymers (CMPs) are a class of organic porous polymers that have attracted extensive attention thanks to their large specific surface area, good physicochemical stability and unique extended π-conjugation along the polymer skeleton. Here we report a fluorine-containing conjugated microporous polymer (F-CMP), which was synthesized via Sonogashira cross-coupling reaction from 1, 3, 5-trifluoro-2, 4, 6-triiodobenzene and 1, 3, 5-triethynylbenzene. As a comparison, fluorine-free conjugated microporous polymer (H-CMP) was synthesized in the same condition from 1, 3, 5-tribromobenzene and 1, 3, 5-triethynybenzene. By introducing fluorine atom into the conjugated microporous skeleton, the contact angle of F-CMP with water reaches 145°, exhibiting excellent hydrophobicity. Nitrogen adsorption/desorption isotherms of the F-CMP show a high specific surface area of 638 m²·g^-1, and the pore size distribution analysis shows the existence of both micropores and macropores. It can be obtained by adsorption experiments of oil and organic solvents that the adsorption capability of F-CMP increases significantly compared with its fluorine-free counterpart with similar structural skeleton. Due to high hydrophobicity and porous properties, F-CMP shows excellent adsorption properties towards to the removal of organic solvents and oils. The adsorption capability of F-CMP towards pump oil and chloroform can reach 40 g/g and 43 g/g, respectively. Meanwhile, F-CMP shows rapid adsorption rate and excellent adsorption recyclability. Thus, F-CMP displays promising application prospects in the field of organic pollutant adsorption and environmental remediation.
- conjugated microporous polymer,
- fluorine doping,
- adsorption material
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