Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 471, Issue -, Pages 117-123Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2015.02.023
Keywords
Thermo responsive; Electrospun; ZnO nanoparticle; PNIPAM nanofibers; Photocatalysis
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Funding
- National Natural Science Foundation of China [51402073]
- Fundamental Research Funds for the Central Universities and Program for Innovation Research of Science in Harbin Institute of Technology, China [T201410]
- Excellent Academic Leaders Foundation of Harbin, China [2014RFXXJ017]
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In this paper, thermo responsive ZnO/PNIPAM nanocomposites were fabricated via electrospinning with the dispersing of ZnO nanoparticles into PNIPAM nanofibers. The effect of the electrospinning parameters on morphology of the nanofibers and the temperatures on the morphology of the nanocomposites was both investigated by SEM-EDS. Furthermore, the photocatalytic kinetics of the nanocomposites was studied by the evaluation of the photocatalytic activities of the nanocomposites above and/or below the lower critical solution temperature (LCST) of PNIPAM. The nanofibers remained the original sizes and shapes above the LCST values, while dissolved obviously and released the embedded ZnO nanoparticles below the LCST values of PNIPAM. The existence of PNIPAM contributed not only the thermo responsive abilities to the nanocomposites, but also the enhanced photocatalytic activities to ZnO nanoparticles, by the detected results of UV-vis spectra of the degradation rates of Rhodamine B and by the calculation results of EPR measurements for the photo induced reactive oxygen species (ROS) of the nanocomposites. Thus, fibrous ZnO/PNIPAM nanocomposites could exhibit switchable and controlled photocatalytic activities through the changing of the temperatures. (C) 2015 Elsevier B.V. All rights reserved.
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