Details

Autor(en) / Beteiligte

• Mohamed, Alaa
• Osman, T.A.
• Toprak, M.S.
• Muhammed, M.
• Yilmaz, Eda
• Uheida, A.

Titel

Visible light photocatalytic reduction of Cr(VI) by surface modified CNT/titanium dioxide composites nanofibers

Ist Teil von

• Journal of molecular catalysis. A, Chemical, 2016-12, Vol.424, p.45-53

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •Inexpensive and simple fabrication route for flexible composite nanofibers system.•High photoreduction efficiency was obtained compared to other reported studies.•The experimental kinetic data were fitted well with pseudo-first order model.•Stability of the fabricated composite nanofibers allowing their reuse.•The flexibility of the composite nanofibers allows use in a continuous operation mode. In this work we report a highly efficient photocatalytic reduction of Cr(VI) based on PAN-CNT/TiO2-NH2 composite nanofibers fabricated by using electrospinning technique followed by chemical crosslinking of surface modified TiO2 NPs functionalized with amino group. The structure and morphology of the fabricated composite nanofibers were characterized by FTIR, SEM, TEM, TGA, and XPS. The results indicate that the composite nanofibers possess excellent photoreduction performance for Cr(VI) under visible light (125W) after 30min, which is much faster than previous reports. The effects of various experimental parameters such as catalyst dose, irradiation time, initial concentration of Cr(VI), and pH on the photoreduction efficiency of Cr(VI) were investigated. The highest photoreduction efficiency of Cr (VI) was obtained at low acidity and low amount of TiO2/CNT photocatalyst. The kinetic experimental data was attained and fitted well with a pseudo-first-order model. The UV–vis spectrophotometer and XPS analyses proved that chromate Cr(VI) was reduced to Cr(III). In addition, it can be concluded that the addition of the phenol enhances the photocatalytic reduction of Cr(VI). Furthermore, the photoreduction mechanism has also been discussed. Finally, the fabricated composite nanofibers were found to be stable after at least five regeneration cycles.