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Visible light photocatalytic reduction of Cr(VI) by surface modified CNT/titanium dioxide composites nanofibers
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Akhbar El Yom Academy, Egypt.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.ORCID iD: 0000-0001-5678-5298
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
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2016 (English)In: Journal of Molecular Catalysis A: Chemical, ISSN 1381-1169, E-ISSN 1873-314X, Vol. 424, p. 45-53Article in journal (Refereed) Published
Abstract [en]

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 (125 W) after 30 min, 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.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 424, p. 45-53
Keywords [en]
Chromium (VI), Composite nanofibers, Photocatalytic reduction, Visible light, Chromium compounds, Crosslinking, Efficiency, Fabrication, Light, Nanofibers, Titanium dioxide, X ray photoelectron spectroscopy, Chemical cross-linking, Electrospinning techniques, Experimental parameters, Photoreduction mechanisms, Structure and morphology, Chromium
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-195184DOI: 10.1016/j.molcata.2016.08.010ISI: 000386739300006Scopus ID: 2-s2.0-84982123816OAI: oai:DiVA.org:kth-195184DiVA, id: diva2:1047796
Note

QC 20161118

Available from: 2016-11-18 Created: 2016-11-02 Last updated: 2017-11-29Bibliographically approved

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Toprak, Muhammet S.Muhammed, MamounUheida, Abdusalam

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