Abstract
Polytetrafluoroethylene emulsion was ultrasonically mixed with an extremely spinnable poly(acrylic acid-co-hydroxyethyl methacrylate) solution to get a dispersion with good spinnability, and the obtained dispersion was then wet-spun into water-swellable fiber. Crosslinking agents and iron species were simultaneously introduced into the water-swellable fiber through simple impregnation and water swelling. A composite fiber with Fenton reaction-catalyzing function was then fabricated by sequentially conducting crosslinking and sintering treatment. Due to crosslinking-induced good resistance to water swelling and PTFE component-induced hydrophobicity, the composite fiber showed a highly stable activity to catalyze H2O2 to oxidatively decolorize methylene blue (MB). Within nine cycles, the composite fiber could decolorize more than 90% of MB within one minute in the presence of H2O2 and did not show any attenuation in MB decolorization efficiency. The composite fiber still could reduce the total organic carbon of MB aqueous solution from 18.3 to 10.3 mg/L when used for the ninth time. Therefore, it is believable that the prepared fiber has good and broad application prospects in the field of dye wastewater treatment.
Highlights
In recent years, the textile industry has ushered in an opportunity to develop new products due to the increasing demand for high-performance and special textiles in different countries of the world
The prepared fiber O-1 shows the stretching vibration peaks of O-H and C=O of the Acrylic acid (AA) structural unit at 3221 [20] and 1695 cm−1 [21], as described in Figure 1; the Fourier transform infrared spectrometer (FTIR) curve of fiber O-1 shows a peak at 1161 cm−1, which is caused by the stretching vibration of C-O in C-O-C of the Hydroxyethyl methacrylate (HEMA) structural unit [22]
Fe2 O3 [33]; the peak at 28.8◦ by FeO [34]; the peak at 34.2◦ by Fe3 O4 [35]. This result demonstrates that the iron species supported by PTFE/P(AA-co-HEMA) composite fiber is mainly composed of the iron oxides mentioned above
Summary
The textile industry has ushered in an opportunity to develop new products due to the increasing demand for high-performance and special textiles in different countries of the world. The heterogeneous Fenton process usually uses catalysts prepared by immobilizing active iron-based components onto carriers through ion exchange and/or chemical coordination to catalyze H2 O2 to produce ·OH. The heterogeneous Fenton process can effectively widen the applicable pH range, minimize the H2 O2 consumption, and decrease the production of iron-rich sludge Materials such as carbon materials [11], diatomite [12], a molecular sieve [13], and fiber [14] are commonly used as carriers. Crosslinking could help enhance the thermal stability of P(AA-co-HEMA); P(AA-co-HEMA) did not Polymers 2021, 13, 1570 decompose during sintering In this case, P(AA-co-HEMA) could help the obtained fiber to lock active iron-based components firmly, and the continuous PTFE phase could impart good environmental resistance to the obtained fiber. This work is expected to advance the development and application of PTFE-based fibers and to shed light on the preparation of novel heterogeneous Fenton catalysts
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