期刊
出版社
ELSEVIER
DOI: 10.1016/j.mseb.2020.114913
关键词
Photocatalysis; Antifouling; Nanofibers; Titanium (IV) oxide; Visible light
资金
- South African (NRF) - Sultan Qaboos University (SQU, Oman) [CL/SQU-SA/18/01, OMSA170413227101]
Polyacrylonitrile and its TiO2 composites were electrospun into nanofibers for photocatalysis and antifouling experiments, showing superhydrophobicity. The polyacrylonitrile-TiO2 nanofibers exhibited higher degradation of methylene blue and production of OH radicals compared to polyacrylonitrile nanofibers under visible light. Additionally, the polyacrylonitrile-TiO2 nanofibers demonstrated antimicrobial properties, inhibiting the growth of bacteria, particularly Bacillus sp., under visible light conditions.
Polyacrylonitrile and its TiO2 composites were electrospun into nanofibers in N, N'-dimethylformamide for photocatalysis and antifouling experiments. The resultants nanofibers were characterized using field emission scanning microscope, Fourier transform infrared spectroscopy, x-ray diffraction, x-ray photoelectron spectroscopy and contact angle analyses. Fourier transform infrared spectroscopy confirmed the formation of polyacrylonitrile-TiO2 composite nanofibers with their diameter ranging from 10 to 340 nm. The x-ray photoelectron spectroscopy results indicate the formation of O-Ti-C bonds on polyacrylonitrile-TiO2 matrix. polyacrylonitrile-TiO2 and polyacrylonitrile nanofiber surfaces showed superhydrophobicity with water contact angle of 155 +/- 1 and 154 +/- 1, respectively at 120 s. The photocatalytic properties of polyacrylonitrile nanofibers and polyacrylonitrile-TiO2 nanofibers were investigated under a simulated visible light source of 1000 W/m(2) using methylene blue. About 90% of methylene blue was degraded within 3 h of exposure using polyacrylonitrile-TiO2 nanofibers while 55% methylene blue degradation was achieved for polyacrylonitrile nanofibers. Photoluminescence experiment conducted on both materials showed that polyacrylonitrile-TiO2 could produce OH radicals 10-fold compared to polyacrylonitrile nanofibers. Antimicrobial tests were conducted using E. coli and Bacillus sp. The results showed that only polyacrylonitrile-TiO2 under visible light hindered the growth of these bacteria with a greater effect on the Gram-positive bacterium, Bacillus sp. The photo-degradation and microbial growth inhibition properties of polyacrylonitrile-TiO2 showed that the material could be used as an antifouling material under visible light.
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