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Highly selective removal of 2,4‐dinitrophenol by a surface imprinted sol–gel polymer
Author(s) -
Cheng Guohao,
Yu Wenna,
Yang Can,
Li Shiying,
Wang Xiaoyue,
Wang Peiyun,
Zhang Kaige,
Li Xiang,
Zhu Guifen
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49236
Subject(s) - adsorption , freundlich equation , molecularly imprinted polymer , thermogravimetry , materials science , polymer , chemical engineering , sorbent , desorption , monomer , molecular imprinting , sol gel , selectivity , chemistry , nuclear chemistry , organic chemistry , nanotechnology , composite material , catalysis , engineering
In this work, 2,4‐dinitrophenol (2,4‐DNP), a new molecularly imprinted polymer (MIP) with excellent performance was synthesized in ethanol by the sol–gel method using 3‐aminopropyltriethoxysilane as functional monomer on the surface of silica particles. The structure and morphology of MIP were characterized via scanning electron microscopy, nitrogen adsorption–desorption analysis, infrared spectra, and thermogravimetry analysis. Results demonstrated that MIP had excellent selectivity toward the template molecule (2,4‐DNP) with an imprinting factor of 9.55 and a maximum static adsorption capacity of 114.7 mg g −1 . Data obtained from the adsorption isotherm of 2,4‐DNP were fitted well with the Freundlich isotherm model, and the adsorption process can be described by the pseudo‐second‐order model. The investigation of adsorption mechanism revealed that the specific recognition process of MIP toward 2,4‐DNP was dominated by the hydrogen bond and molecular structure. By employing as a sorbent, the as‐prepared MIP was applied to recognize and remove 2,4‐DNP in poster paper, nonwoven fabric and brown curtain with recoveries in the range from 85.74 to 100.00%. However, the MIP can effectively remove 2,4‐DNP after five cycles.