Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201900134
Keywords
conjugated microporous polymer; membrane; nanofiltration; organic solvent; selectivity controlling
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Funding
- National Key Basic Research Program of China [2014CB931801, 2016YFA0200700]
- National Natural Science Foundation of China [51472054, 21475029, 21721002, 91427302]
- Chinese Academy of Sciences [QYZDJ-SSW-SLH038, YZ201311, XDA09040100]
- CAS-CSIRO Cooperative Research Program [GJHZ1503]
- K.C. Wong Education Foundation
- Youth Innovation Promotion Association CAS
- Program for Chang Jiang Scholars and Innovative Research Team, Ministry of Education, China [IRT1283]
- Program of Innovation and Entrepreneurial for Talent, Lan Zhou, Gansu Province, China [2014-RC-39]
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To realize selective separation of important small molecules in organic solvents with high permeability is highly desired but not attained yet, because it requires stringent control over selectivity in nanofiltration membranes. Here, a thiophene-containing conjugated microporous polymer membrane, in which the pore size is finely tuned at the angstrom scale through postoxidation of the thiophene moieties, is reported. The successful modification is confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and water contact angle, leading to obvious pore size reduction evidenced by nitrogen adsorption. Upon postmodification, the selectivity of the membrane can be effectively controlled. In the pristine membrane, the methanol permeance reaches 32 liters per square meter per hour per bar (L m(-2) h(-1) bar(-1)) with a molecular weight cut-off (MWCO) of 800 g mol(-1). Significantly, after in situ postmodification of thiophene moieties, the largest pore size is reduced from 1.73 to 1.48 nm, giving rise to a remarkable decrease of MWCO from 800 to 500 g mol(-1), while the permeance of methanol still maintains as high as 21 L m(-2) h(-1) bar(-1).
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